The Difference Between a Decorator, Interior Designer, and Certified Interior Designer
In California, the titles Interior Decorator and Interior Designer are not legally restricted. Anyone may use them. However, each role represents different qualifications, responsibilities, and expertise. Understanding these distinctions helps you hire the right professional for your project.
Why It Matters
Choosing a design professional is more than a matter of style. Only a Certified Interior Designer (CID) offers a verified combination of education, experience, and legal accountability. This ensures both creative excellence and code-compliant results.
Interior Decorator
Focus: Aesthetics and styling
Decorators specialize in the visual aspects of a space such as color, furniture, finishes, and décor. Their work enhances appearance rather than altering structure.
Typical Services
- Selecting paint colors, fabrics, and furnishings
- Creating cohesive design palettes
- Arranging furniture and accessories
Business Practices
- Usually charge hourly, plus a markup (commonly 20% to 50%) on products
- Typically work without formal contracts
- Not regulated under California law
Interior Designer
Focus: Function, aesthetics, and project management
Typical Services
- Creating construction drawings and documentation for permits
- Coordinating with contractors and consultants
- Ensuring compliance with building codes
Interior Designers are not legally regulated in California, and qualifications may vary widely.
Certified Interior Designer (CID)
Focus: Full professional qualification and legal recognition
A Certified Interior Designer holds a legally protected title under the California Business and Professions Code (BPC). This certification guarantees that the designer has met rigorous state standards in education, experience, and examination.
Key Benefits
- Authorized to prepare and submit nonstructural, nonseismic interior plans to local building departments (per BPC Sections 5805 and 5538)
- Qualified to produce complex interior plans requiring licensed contractor implementation
- Held to a strict Code of Ethics
- Required to complete Continuing Education courses regularly
📘 Verify a Certified Interior Designer’s credentials
Make an Informed Choice
When hiring for your next project, consider the scope, complexity, and legal requirements. For projects that involve construction documents, building permits, or public spaces, hiring a Certified Interior Designer ensures compliance, safety, and professional integrity.
Why Hire a Certified Interior Designer (CID)?
Many people assume all interior designers are licensed or certified, but this is not true. In California, anyone may use the title Interior Designer. The title Certified Interior Designer (CID) is the only legally recognized and protected designation for interior designers in the state.
A Certified Interior Designer is a qualified design professional who may prepare and submit nonstructural, nonseismic construction documents and specifications to local building departments for plan review. Certified Interior Designers have demonstrated, through education, experience, and examination, their knowledge of the California Building Code as it relates to space planning, life safety, flammability, and accessibility under Chapter 3.9 of the California Business and Professions Code, beginning with Section 5800.
CCIDC is the organization responsible for administering the requirements of the Certified Interior Designers Title Act.
Education
To be eligible for certification, an interior designer must meet the examination requirements and have either the required years of interior design education, diversified interior design experience, or a combination of both.
Certification requires a minimum of 40 core units from an interior design program accredited by an agency recognized by the U.S. Department of Education, or at least eight years of diversified interior design experience.
Every active Certified Interior Designer must also complete continuing education courses totaling 10 hours of Continuing Education Units (CEUs) during each two-year renewal period.
Experience
Certified Interior Designers complete several years of diversified interior design experience. This includes the preparation, or instruction in the preparation, of nonstructural or nonseismic plans that require the skills of a licensed contractor to implement.
Experience covers programming, planning, design, and documentation of the construction and installation of nonstructural and nonseismic elements, finishes, and furnishings within interior spaces. This work demonstrates the designer’s ability to protect and enhance the health, safety, and welfare of the public.
Examination
The IDEX® California Exam is specifically developed for certification in California. It tests candidates on the California Building Code (CBC), Title 24, and professional standards including ethics, business practices, and design principles.
To earn certification, candidates must pass the IDEX® California Exam, which evaluates knowledge in both residential and commercial areas. Exam topics include California codes and regulations, design synthesis, schematics, programming, space planning, design development, working drawings, construction documents, furniture and finish specifications, lighting design, contract administration, and business law.
Ethics
Certified Interior Designers are held to the highest standards of professional responsibility as defined in the CCIDC Code of Ethics and Conduct.
They must uphold the principles of integrity, objectivity, competence, fairness, confidentiality, professionalism, and diligence. A Certified Interior Designer is expected to conduct business in a manner that earns the respect of clients, suppliers, fellow professionals, and the public.
Each Certified Interior Designer bears an individual responsibility to adhere to this code and to maintain the trust placed in the profession.
Title Act vs. Practice Act
Understanding the difference between a Title Act and a Practice Act is essential when discussing how interior design is regulated in California. These two types of legislation define who can perform certain professional activities and who can use specific professional titles.
Practice Act
A Practice Act regulates specific actions or “practices” that may only be performed by individuals who are licensed to do so.
For example, only a licensed engineer can design a bridge. This type of regulation defines a particular set of practices, requires proof of education, experience, and testing, and grants a license or registration to individuals qualified to perform those activities.
If an interior designer attempted to design a bridge, that act would violate a Practice Act because the designer is not licensed as an engineer.
Title Act
A Title Act regulates the use of a professional title rather than the specific practice itself. It allows individuals to work in a given field but restricts the use of certain titles to those who meet defined standards of qualification.
Under a Title Act, professionals must prove that they have achieved a specific level of education and experience related to that title. For example, in California, interior designers who meet the state’s minimum qualifications may become Certified Interior Designers (CIDs).
A Title Act does not restrict others in the industry from conducting business as interior designers, but it ensures that only qualified individuals may use the protected title.
How It Applies to Interior Design in California
In California, anyone may use the title “Interior Designer” regardless of education or experience. However, only those who meet the requirements set forth by the California Business and Professions Code may legally use the title “Certified Interior Designer”.
Individuals would be in violation of the Title Act if they use any of the following protected titles without proper certification:
- Certified Interior Designer or CID
- Registered Interior Designer
- Licensed Interior Designer
- Interior Architect (Illegal to use by other than a licensed architect)
The Title Act provides clarity for consumers and ensures that only those who have demonstrated the required education, experience, and examination standards can use the title Certified Interior Designer.
Code of Ethics and Conduct
1.1 Object of the Code
A Certified Interior Designer must conduct his or her professional practice in a manner that promotes respect from clients, suppliers of goods and services, colleagues, and the public. It is the personal responsibility of every Certified Interior Designer to adhere to this Code of Ethics and Conduct.
1.2 Responsibility to the Public
- In performing professional services, a Certified Interior Designer shall exercise reasonable care and competence and comply with all applicable laws, regulations, and codes.
- A Certified Interior Designer shall always consider the health, safety, and welfare of the public.
- A Certified Interior Designer shall not knowingly violate the law or assist a client in conduct known, or reasonably should be known, to be illegal.
- A Certified Interior Designer shall not accept payment from a client for any installation or construction work that requires a licensed contractor unless the designer holds such a license from the State.
- A Certified Interior Designer shall not permit the use of his or her name, signature, or stamp on a design or project unless the interior design services were performed by the designer or under the designer’s responsible direction.
- A Certified Interior Designer shall not engage in false or misleading advertising or imply that employees or associates are Certified Interior Designers unless that is factually correct.
- A Certified Interior Designer shall not make deceptive or false statements about qualifications, experience, or performance.
- A Certified Interior Designer shall not engage in conduct involving fraud, deceit, misrepresentation, or dishonesty in professional or business activity.
- In all professional activities, a Certified Interior Designer shall not discriminate based on race, religion, gender, national origin, age, disability, or sexual orientation.
- A Certified Interior Designer shall refuse to consent to any client or employer decision that violates the law or poses a significant risk to public health or safety.
1.3 Responsibility to the Client
- A Certified Interior Designer shall accept assignments only when qualified by education, training, or experience to perform the required services.
- Before accepting a project, a Certified Interior Designer shall inform the client of the project scope, the services to be provided, and the method of compensation. The scope of a project shall not be materially changed without the client’s consent.
- A Certified Interior Designer should have a written contract or agreement outlining the project scope, fees, payment schedule, expected completion date, and provisions for dispute resolution such as binding arbitration.
- A Certified Interior Designer shall disclose in writing any financial interest that could affect professional judgment. If a conflict arises, the designer must either end that interest or withdraw from the engagement if the client objects.
- A Certified Interior Designer shall maintain client confidentiality regarding information obtained in the course of professional services. Information may only be disclosed if necessary to prevent a significant risk to public health or safety, or to prevent a violation of the law or this Code of Ethics.
1.4 Responsibility to Other Certified Interior Designers and Colleagues
- A Certified Interior Designer shall conduct all professional relationships with honesty, integrity, fairness, and respect for the contractual and professional rights of others.
- A Certified Interior Designer shall not engage in or encourage activities that may unjustly damage another designer’s or colleague’s reputation or business.
- A Certified Interior Designer shall not knowingly participate in plagiarism or copy another’s work.
- A Certified Interior Designer shall not endorse or recommend the certification of any individual known to be unqualified in education, training, experience, or character.
- A Certified Interior Designer shall take credit only for work personally performed or completed under the designer’s supervision.
1.5 Responsibility to the Profession
- A Certified Interior Designer shall maintain professional and personal conduct that reflects positively on the profession.
- A Certified Interior Designer shall continually seek to advance professional knowledge and competence.
- A Certified Interior Designer shall promote the sharing of knowledge and collaboration with other Certified Interior Designers, allied professionals, industry partners, and the public whenever possible.
- A Certified Interior Designer shall not make false statements or withhold material facts in any application for certification or renewal.
Frequently Asked Questions About Certified Interior Designers
Hiring a Certified Interior Designer (CID) ensures that you are working with a trained, experienced, and tested design professional. If you have never worked with a designer before, the process can seem overwhelming. This guide will help you make informed decisions when hiring the right interior designer for your home, office, retail, or commercial project.
Choosing a qualified designer is essential. While many people call themselves interior designers, only Certified Interior Designers have met California’s professional standards through education, experience, and examination.
CCIDC, the California Council for Interior Design Certification, was established in 1992 to help consumers identify qualified, vetted interior designers who meet the state standard for certification.
What is a Certified Interior Designer (CID)?
(B&P Code Sections 5800, 5538)
A Certified Interior Designer is a professional qualified to design, prepare, and submit nonstructural, nonseismic interior construction plans and specifications to local building departments.
Certified Interior Designers have proven their knowledge of the California Building Code, including space planning, life safety, flammability, and accessibility requirements. They have demonstrated competency through formal education, practical experience, and successful completion of the IDEX California Examination.
What Do “Nonstructural” and “Nonseismic” Mean?
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Nonstructural refers to interior elements that are not load-bearing and do not support a building’s structure.
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Nonseismic refers to interior elements that do not contribute to the seismic bracing of a building.
Examples of nonstructural elements include ceilings, partitions, and other interior components that do not affect the building’s structural integrity.
What Are the Qualifications of a Certified Interior Designer?
(B&P Code Sections 5801, 5801.1)
A Certified Interior Designer must complete one of the following:
- A four- or five-year accredited program plus a minimum of two years of experience
- A three-year accredited program plus three years of experience
- A two-year accredited program plus four years of experience
- Or a combination of education and experience totaling eight years
They must also pass the IDEX California Exam, based on the California Building Code, Title 24, and relevant state laws and regulations.
Only individuals who meet these requirements and are certified by CCIDC may use the title Certified Interior Designer.
How Can I Verify a Designer’s Certification?
Visit Verify Certification to confirm whether an interior designer is certified and in good standing.
Has Your Designer Signed a Code of Ethics and Conduct?
All Certified Interior Designers are required to sign and follow the CCIDC Code of Ethics and Conduct.
Ask your designer if they have signed this code and request a copy for your records.
How Are Certified Interior Designers Identified?
(B&P Code Section 5802)
Each Certified Interior Designer must affix an official CCIDC stamp and wet signature to all drawings, specifications, and documents prepared for submission.
These documents are labeled as interior design documents, not architectural or engineering documents.
Sample CCIDC Stamp:
Are Certified Interior Designers State Certified?
(B&P Code Sections 5804 and 5538)
CCIDC is the nonprofit organization that administers the Certified Interior Designers Title Act. CCIDC reports to the California Legislature and has governmental oversight.
Anyone may use the title Interior Designer, but only Certified Interior Designers have met verified qualifications to protect the health, safety, and welfare of the public.
Can a Certified Interior Designer Act as a General Contractor?
(B&P Code Section 5803)
Certified Interior Designers must hold a valid contractor’s license to hire subcontractors or perform construction work. They are authorized to prepare designs for work that will be completed by licensed contractors.
Can Certified Interior Designers Design Disabled Access Systems?
Yes. Certified Interior Designers are tested on accessibility codes through the IDEX California Exam and must demonstrate proficiency in disabled access standards and related code requirements.
They are recognized under Section 5800(a) as having proven competence to protect and enhance public health, safety, and welfare.
Can a Certified Interior Designer Include Mechanical or Electrical Drawings in Their Plans?
Yes, provided that all mechanical and electrical work is prepared and stamped by a licensed mechanical or electrical engineer.
How Can I Find a Certified Interior Designer for My Project?
Certified Interior Designers are trained to guide you through every stage of your project, from initial planning and budgeting to construction and completion. Their expertise helps you maximize your budget, avoid costly mistakes, and achieve functional, beautiful results.
Fees for Certified Interior Designers are competitive in the marketplace.
Visit Hire a Local CID to find qualified professionals in your area.
Finding the Right Interior Designer for Your Project
Be an Informed Consumer!
Hiring an interior designer can be an exciting step, but it also requires careful research and due diligence. Protect your investment and make informed decisions by following these guidelines:
- Do your research before hiring anyone.
- Take responsibility and avoid becoming a victim of inexperience or misrepresentation.
- Know exactly who you are doing business with.
- Remember that anyone can call themselves an “interior designer,” regardless of their qualifications.
- Shop around and compare designers before making a commitment.
- Request a list of Certified Interior Designers in your area from CCIDC.
- Understand what a Certified Interior Designer is and how their qualifications differ from others.
- Check credentials thoroughly before signing a contract.
Be Clear About Your Expectations
A successful project begins with clear goals and communication.
- Define what you want to achieve before you begin.
- Gather examples or inspiration images that reflect your vision.
- Ask yourself if you truly need professional assistance.
- Consider the time and cost involved before committing.
- Remember that what you see on TV design shows does not reflect real-life budgets, timelines, or processes.
Check Qualifications
Before hiring, confirm that your designer is properly qualified.
- Ask if they are a Certified Interior Designer and verify their certification at ccidc.org.
- Determine how long they have been practicing interior design.
- Ask about their educational background in interior design.
- Find out which professional examinations they have taken and passed.
- Confirm whether they have been tested on California building codes and regulations.
Check Their Work
Seeing a designer’s work is the best way to gauge their skill and professionalism.
- Contact references, even if you personally know the designer.
- Review their recent projects and, if possible, visit completed sites.
- Ask how long their projects typically take and whether they stay on budget.
Get a Proper Contract
A well-written contract protects both you and your designer.
- Certified Interior Designers are required by law to provide a written contract (CA Business & Professions Code Section 5807).
- If your designer is not certified, require a formal interior design agreement.
- Consider having an attorney review the contract before signing.
- Ensure the contract clearly defines:
- The scope of work
- Fees and payment schedules
- Project completion timelines
- A dispute resolution clause
- Ask about insurance coverage for purchases made on your behalf.
- Certified Interior Designers must disclose Errors and Omissions (E&O) insurance by law (CA BPC Section 5807).
Establish a Budget
Budget planning is essential to the success of any design project.
- Do not begin work until a clear budget is established and agreed upon.
- Include all design fees, materials, taxes, shipping, and other related costs.
- Ensure your designer obtains multiple bids for custom work and construction.
- Never pay a designer for construction work unless they hold a valid California contractor’s license.
- Pay contractors and subcontractors directly rather than through the designer.
- Verify any claimed contractor’s license with the Contractors State License Board (CSLB).
- For items marked up by the designer, request to see the original invoices before purchase.
Be Prepared for the Unexpected
Even with careful planning, surprises can occur during any project.
- Materials or products may be delayed or discontinued.
- Demolition or renovation may reveal unforeseen conditions that require additional work.
- Set aside a contingency fund of 10% to 20% of your total budget for unexpected costs.
- Project delays can increase expenses since contractors and designers charge for their time.
- Stay flexible and open to adjustments to keep your project on schedule and within budget.
- Trust your design professional to guide you through challenges effectively.
The Reality of Remodeling
Remodeling can be disruptive, especially if you are living or working in the space.
- Consider temporarily relocating if the work is extensive.
- If you must remain in the space, prepare for noise, dust, and interruptions.
- Avoid micromanaging; allow your designer and contractors to do their work.
- Communicate regularly with your designer and respect the professional process.
Listen to the Professional
You have hired a professional, trust their expertise.
- Listen carefully to your designer’s recommendations and reasoning.
- If you feel uncomfortable or dissatisfied with the design direction, discuss your concerns promptly.
- Remember that the designer’s client is you, not your friends, relatives, or coworkers.
- Do not allow others to give instructions to the designer without your approval.
Consumer Alerts
Verify Before You Hire
When planning your project, always verify that your interior designer is a Certified Interior Designer (CID) certified by the California Council for Interior Design Certification (CCIDC). Certified Interior Designers have verified education and professional experience, and have successfully passed the IDEX® California Examination, which evaluates their knowledge of California building codes, accessibility standards, and safety regulations.
Certified Interior Designers are the only design professionals legally recognized in California to prepare and submit nonstructural, nonseismic interior construction plans as defined by California Business and Professions Code (CBPC) Section 5800.
Visit Verify Certification to verify that your interior designer is a Certified Interior Designer (CID) before you hire them.
Be Cautious When Hiring Anyone Using the Title “Interior Architect”
Consumers should be aware that the title “Interior Architect” is not a legally permitted title in California.
Only individuals licensed by the California Architects Board may use any form of the title Architect. Using “Interior Architect” misleads consumers and violates state law.
The Use of Initials “C.I.D.” and the Title “Certified Interior Decorator”
There are online, for-profit companies that sell “certifications” under titles such as “Certified Interior Decorator” or allow the use of the initials “C.I.D.” after completing their unaccredited programs. These organizations:
- Are not approved or recognized by the State of California or any state regulatory agency.
- Have no legal authority under California law to certify or credential interior designers.
- Are not overseen by the California Legislature and do not meet the education, experience, or testing requirements of legitimate certification.
By contrast, CCIDC is the only certifying body authorized by the California Legislature to certify interior designers in the state.
Only those certified by CCIDC may legally use the title Certified Interior Designer and the appellation CID. All CCIDC-certified professionals:
- Meet state-mandated education and experience requirements.
- Have passed the IDEX® California Examination.
- Must adhere to the CCIDC Code of Ethics and Conduct.
California Business and Professions Code (CBPC) Section 5812
It is an unfair business practice for any person to represent or hold himself or herself out as, or to use the title “certified interior designer” or any other term, such as licensed, registered, or CID, that implies or suggests that the person is certified as an interior designer when he or she does not hold a valid certification as provided in Sections 5800 and 5801 of the CBPC.
Violations of this section may result in legal action or penalties for misrepresentation.
Assessing Your Design Needs
Before hiring a Certified Interior Designer (CID), take time to evaluate your project. Preparing this information in advance will help you communicate your expectations clearly and make it easier for Certified Interior Designers to understand your goals and provide accurate proposals.
Evaluate Your Project
When outlining your project, consider the following:
- The services you expect the Certified Interior Designer to perform
- The size, style, and functional requirements of your space
- The amount you intend to spend on design fees (if known)
- The materials, furnishings, and lighting preferences you have in mind
- The construction budget and how the project will be financed
- Your anticipated start and completion dates
- How the construction will be managed or executed
Request Information
Ask several Certified Interior Designers about their qualifications and experience. Reviewing multiple professionals will help you find one whose skills and approach best match your project. Once you have narrowed your list, schedule interviews to discuss your project, learn about their process, and assess your working compatibility.
Questions to Ask During Selection
General Questions
- Do you hold a valid Certification with CCIDC? What is your Certification number?
- Do you carry professional insurance? What types, and what are the policy limits?
- How long have you been in business, and how many people are on your team?
- How do you stay current with California codes, materials, and design standards?
- Will you use consultants for this project? If so, who are they, and what are their qualifications?
- What portion of your practice involves projects similar to mine?
Questions About Experience
- Have you recently completed projects similar to mine? How many?
- May I see examples of comparable work such as sketches, photos, or plans?
- When and what was your most recent project?
- May I contact past clients whose projects you have shared as examples?
- What were the actual design and construction costs compared to the original budgets?
- What services did you provide during the design, bidding, and construction phases?
- What services do you propose for my project, and who will provide them?
Questions About Fees
- What is your fee schedule, and how are fees determined?
- What services do these fees cover?
- Will you provide probable construction cost estimates?
- If consultants are needed (e.g., architects or engineers), are their fees included?
- What additional costs or governmental fees do you anticipate?
- How are fees for additional services or reimbursable expenses determined?
- If redesign becomes necessary to meet the construction budget, will there be an additional charge?
Why It Matters
A well-prepared evaluation and thorough interview process will help you choose the right Certified Interior Designer for your project. Clear communication, defined expectations, and a mutual understanding of fees and responsibilities set the foundation for a smooth, successful design experience.
Making Informed Design Decisions
Choosing the right Certified Interior Designer (CID) is an important step toward a successful project. Before making your final decision, take time to verify credentials, check references, and review past work to ensure your chosen designer is qualified, reliable, and a good fit for your project.
Verify Certification and Professional Standing
Always confirm the certification status of any Certified Interior Designer you are considering. Although a designer may display a certificate, it may be invalid if their certification has expired, been suspended, or revoked.
You can verify certification directly through CCIDC by phone or in writing. CCIDC can also provide information on any recordable complaints or disciplinary actions filed against a Certified Interior Designer.
Visit ccidc.org to confirm certification and professional standing before you hire.
Check References and Past Performance
After verifying credentials, contact the references provided by each Certified Interior Designer. Ask thoughtful questions to understand how they work and how satisfied their past clients have been. Consider asking:
- Did the Certified Interior Designer meet the agreed schedules and budgets?
- Were you satisfied with the designer’s services and working relationship?
- Did the designer listen to your concerns and respond appropriately?
- Would you hire this designer again?
- Were there any problems during the project, and how were they resolved?
If possible, visit completed projects similar to your own to see the quality of work firsthand.
Make Your Decision with Confidence
Selecting the right Certified Interior Designer takes time and care. By verifying certification, checking references, and reviewing past projects, you can move forward with confidence knowing you’ve chosen a qualified professional who meets the state’s standards for education, experience, and ethics.
Interior Design Contract: What It Should Include
A written design contract is one of the most important tools for protecting both you and your Certified Interior Designer (CID). It ensures clear communication, defines the scope of services, and outlines financial and legal responsibilities.
Under the CCIDC Code of Ethics and California Business and Professions Code (BPC) Section 5807, all Certified Interior Designers are required by law to have a written contract in place before beginning any interior design services. This contract must inform the client of the project scope, the services to be performed, and the method of payment.
What the Law Requires
According to BPC Section 5807, the written contract must be signed by both the Certified Interior Designer and the client before any work begins. It must include at least the following:
- A description of the services to be provided.
- The basis of compensation and method of payment.
- The names, addresses, and certification number of the Certified Interior Designer, and the name and address of the client.
- A description of the procedure for requesting or authorizing additional services.
- A description of how either party may terminate the contract.
- A three-day right to cancel, as required by California Civil Code.
- A written disclosure of whether the Certified Interior Designer carries Errors and Omissions (E&O) insurance.
Note: These requirements do not apply when the Certified Interior Designer provides uncompensated services, or when working under a licensed architect, landscape architect, or engineer.
Why It Matters
A written contract is a legally binding document that defines each party’s rights and responsibilities for the duration of the project and, in some cases, beyond its completion. It should clearly specify:
- The services to be provided and under what conditions.
- The project timeline, fees, and payment schedule.
- Procedures for changes, disputes, and termination.
Always review your contract carefully. You have the right to ask questions, negotiate terms, or seek legal review before signing. Keep an original copy of the signed contract for your records.
Avoid signing contracts with other parties (such as contractors) without first notifying your Certified Interior Designer, as this may impact your project’s coordination or liability.
Additional Recommended Items
Beyond what is required by law, CCIDC recommends that your contract also include:
- The project title and address.
- Phases of work requiring client approval.
- Estimated project timeline and completion dates.
- Construction budget and itemized costs.
- A breakdown of the designer’s basic and additional services, including associated fees.
- Identification of consultants (e.g., engineers or landscape designers) and responsibility for hiring, payment, and approval.
- A list of reimbursable expenses not included in the basic fee.
- Payment schedule and retainer details.
- Procedures for dispute resolution (such as mediation or arbitration).
- Ownership and management of project documents.
- Responsibilities for maintaining and reviewing financial records.
Keeping Records
In addition to the contract itself, maintain detailed written and financial records throughout the project:
- Keep notes or memos summarizing meetings and phone discussions with your Certified Interior Designer, including dates and times.
- Save copies of all signed documents, memos, invoices, and payment receipts.
- Require written approval for all additional costs before they are incurred.
- Track project progress through photos or written updates.
These records help prevent misunderstandings and provide valuable documentation should questions or disputes arise later.
Key Takeaway
A comprehensive, transparent, and well-drafted design contract is the foundation of a successful project. It safeguards both you and your Certified Interior Designer, promotes accountability, and ensures that the design process proceeds smoothly, on time, and within budget.
Understanding Design Fees and Project Funds
There is no single industry standard for interior design fees. Each designer may use a different billing structure, so it is essential to understand how your Certified Interior Designer (CID) determines fees before signing a contract. Clear communication about payment expectations helps ensure a smooth and transparent working relationship.
Common Billing Methods
Flat Fee or Fixed Rate
Some designers charge a flat fee for the entire project. This may be based on a lump sum, square footage, or a percentage of the overall budget. Others may charge an hourly rate for design services.
When hourly billing applies, ask:
- What is the hourly rate?
- How many hours are estimated for the project?
- Are additional charges applied for travel time or staff hours?
- Are there reimbursable expenses such as printing, mileage, or shipping?
All fee details must be clearly stated in the written contract.
(Certified Interior Designers are required by law to provide a written contract as stated in CBPC Section 5807.)
Markup or Percentage on Purchases
Some designers, certified or not, may purchase goods on behalf of their clients and apply a markup to items such as furniture, flooring, lighting, or window treatments. This markup compensates for the designer’s time and coordination.
This billing method is most common in residential projects.
To protect yourself:
- Ensure all markup percentages and related costs such as shipping, taxes, and handling are documented in your written contract.
- Request itemized invoices that show original prices, agreed markups, and total amounts.
Transparency in billing helps build trust and prevents disputes later in the process.
Design Services Only
Some Certified Interior Designers provide design-only services, meaning they do not purchase or resell products. In these cases, you pay only for design work and related expenses.
Even if your designer is not handling purchases, they should still assist in coordinating with suppliers or guiding you to reliable sources for furnishings and materials.
Establishing a Budget and Fee Schedule
Before signing the contract, clearly define:
- The total project budget, including design and construction costs.
- Contingency funds, typically 10% to 20% for unexpected expenses.
- The number, amount, and schedule of payments.
Review the payment schedule carefully. If it does not meet your needs, discuss reasonable alternatives before signing.
Each payment should be made only after confirming that the agreed-upon work for that phase has been completed satisfactorily.
Managing Project Funds
- Avoid paying excessive advance or retainer fees before work begins. A reasonable retainer is typically around 10% of the total project budget.
- Ensure that any project loan covers both design services and construction costs.
- Do not make the final payment until the project is complete and you are satisfied with the results.
- Obtain lien releases from all parties involved, including your designer, general contractor, and subcontractors, before final payment.
Careful planning, open discussion, and accurate record keeping will help prevent misunderstandings and fee disputes.
Why Work with a Certified Interior Designer
Certified Interior Designers are trained and tested in professional business practices, project budgeting, and California contract law. They are required to use written contracts, maintain transparency in billing, and uphold the CCIDC Code of Ethics, giving consumers confidence in fair, honest, and professional service.
Bringing Your Design to Life: Construction and Installation
Once your design plans are complete, the next step is turning them into reality. Unless you are experienced in construction, the build-out of your interior should always be handled by a licensed and experienced building contractor. Working with qualified professionals ensures that your project is built safely, efficiently, and in compliance with California building standards.
Preparing for Construction
Your Certified Interior Designer (CID) will provide you with detailed construction documents, including plans and specifications, to guide the contractor. These documents should be clear, complete, and suitable for obtaining competitive bids.
Before construction begins, review the plans with both your Certified Interior Designer and your contractor to confirm that they are complete and suitable for permitting, bidding, and construction. Do not assume that plans approved for a building permit automatically include every detail needed for construction. Coordination and communication at this stage are essential.
Understanding Roles and Responsibilities
Only contractors who hold a valid California State Contractor’s License may legally perform construction work or act as general contractors. Unless your interior designer also holds such a license, they may not:
- Act as a general contractor
- Hire or pay subcontractors directly
- Accept payment for construction work
As the project owner, you must hire and pay the general contractor directly. Your Certified Interior Designer may assist you during construction by observing progress, answering questions, and ensuring design intent is maintained, but financial transactions must occur between you and the contractor.
Hiring a Qualified Contractor
Follow a careful selection process similar to the one used when hiring your Certified Interior Designer. Verify the contractor’s credentials and experience, and check for any complaints or disciplinary actions before signing an agreement.
You can verify a contractor’s license and standing by contacting the California Contractors State License Board (CSLB) at 1-800-321-CSLB (2752) or by visiting www.cslb.ca.gov.
Moving Forward with Confidence
When your Certified Interior Designer and licensed contractor work together as part of a coordinated team, your project is more likely to stay on schedule, within budget, and true to your design vision. With clear plans, open communication, and the right professionals, you can move confidently into the construction and installation phase of your project.
If Problems Occur with Your Interior Design Project
Hiring a Certified Interior Designer (CID) helps ensure professional service and ethical conduct. However, issues can sometimes arise during a project. Most concerns can be resolved through open communication, but if that is not possible, CCIDC can assist in addressing your complaint and ensuring professional accountability.
Step 1: Discuss the Problem
If you encounter a problem, speak directly and calmly with your Certified Interior Designer. Review your written contract, project documentation, and communications to clarify any misunderstandings. Many problems can be resolved quickly through honest discussion and cooperation.
Step 2: Contact CCIDC for Assistance
If you cannot reach a resolution, contact CCIDC. We can:
- Offer guidance and resources to help you resolve the issue.
- Review whether the designer may have violated the CCIDC Code of Ethics or Rules and Regulations.
- Initiate an investigation if a potential violation has occurred.
CCIDC has the legal authority to investigate alleged violations by Certified Interior Designers and, when necessary, take disciplinary action, including suspension or revocation of certification.
A Complaint Form is available on our website for your convenience.
Submit a Complaint
If You Believe a Violation Has Occurred
As a consumer, you have the right to professional and ethical service from your Certified Interior Designer. If you believe the designer has violated the CCIDC Code of Ethics or the California Business and Professions Code, you may file a written complaint with CCIDC.
Once your complaint is received, CCIDC will review the matter, contact you for details, and investigate the issue to determine the appropriate course of action.
If the Designer Is Not Certified
CCIDC can only take disciplinary action against Certified Interior Designers.
If your complaint involves a designer who is not certified, CCIDC can help direct you to other agencies for assistance, such as:
- The Better Business Bureau
- Small Claims Court
- Local consumer protection agencies
What Constitutes a Complaint
CCIDC investigates alleged violations of:
- California Business and Professions Code Sections 5800–5810
- CCIDC Code of Ethics
- CCIDC Rules and Regulations
Certified Interior Designers may face disciplinary action for:
- Fraud in obtaining certification
- Misuse or impersonation of another Certified Interior Designer’s name or stamp
- Using an expired or invalid certification or stamp
- Aiding unlicensed or unlawful practice
- Signing or approving plans not prepared under direct supervision
- Fraud or negligence in professional practice
- False representation of qualifications
- Conflicts of interest
- Incompetence, misconduct, or recklessness
- Violating the CCIDC Code of Ethics
Penalties may include suspension or revocation of certification, mandatory ethics or education courses, or other disciplinary measures.
CCIDC’s Commitment to Consumers
CCIDC is dedicated to protecting the public by ensuring that Certified Interior Designers uphold the highest standards of integrity, competence, and professionalism. While issues are rare, consumers can be confident that concerns will be taken seriously and handled with fairness and transparency.
