Written by Acorn Sales Company, manufacturing stamps and seals since 1964 · Reviewed by Holly R, VP of Sales and Marketing at Acorn Sales, against the California Council for Interior Design Certification, established by statute rather than as a state licensing board and Cal. Bus. & Prof. Code §§ 5800, 5801, 5802 on 21 September 2026 · Updated 21 September 2026
You cannot buy this stamp, and for government filings you cannot do without it. Business and Professions Code § 5801 has the Certified Interior Designer “obtain a stamp from the council,” meaning the California Council for Interior Design Certification issues the device rather than a stamp supplier making it. Every other design profession in the state sends the licensee to a shop: § 411(c) for engineers and surveyors, § 136(a) for architects, § 2606 for landscape architects. Interior design is the exception, because the stamp itself functions as proof that the council holds evidence of your education, experience and examination.
Section 5801 is permissive, and § 5802(a) is not: “All drawings, specifications, or documents prepared for submission to any government regulatory agency by any Certified Interior Designer, or under their supervision shall be affixed by a stamp, as specified in Section 5801, and signed by that Certified Interior Designer.” So private work that never reaches a building department carries no stamping duty, and anything going to a government agency does. Section 5802(b) adds a labeling duty to the documents themselves: “All documents shall be identified as interior design documents, which are not architectural or engineering documents.”
There is no state license behind any of this. California does not license or register interior designers through a state board, practice is open, and § 5805 preserves the right of Certified Interior Designers “or any other person” to submit interior design plans to local building officials except as provided in § 5538. Watch the calendar too: § 5810(b) provides that “This chapter shall remain in effect only until January 1, 2027, and as of that date is repealed.”
California interior designer seal requirements at a glance
| Requirement | California rule | Source |
|---|---|---|
| Seal required | Conditional | Cal. Bus. & Prof. Code §§ 5800, 5801, 5802 |
| Required elements | A number that uniquely identifies you, Your name and Certified Interior Designer, or Certified Interior Designer with commercial designation | Cal. Bus. & Prof. Code § 5801 |
| Size and shape | Not addressed in statute. | Cal. Bus. & Prof. Code §§ 5801, 5801.1 (no dimension stated) |
| Device allowed | Not a purchase decision. | Cal. Bus. & Prof. Code §§ 5801, 5811 |
| Signature and date | Stamp and signature together, with no dating rule. | Cal. Bus. & Prof. Code § 5802 |
| What must be sealed | Drawings, specifications or documents prepared for submission to any government regulatory agency by a Certified Interior Designer or under that person’s supervision. | Cal. Bus. & Prof. Code §§ 5802, 5803, 5805 |
| Electronic seal | Not addressed. Chapter 3.9 says nothing about an electronic or digital stamp or signature, and there is no state board rule to supply the gap. Checked sections 5800 through 5812 in full. Where a California public agency. | Cal. Bus. & Prof. Code §§ 5800 to 5812 (silent) |
| Renewal and lapse | The whole chapter has an end date. | Cal. Bus. & Prof. Code §§ 5810, 5801.1 |
| Firm requirements | Not applicable. | Cal. Bus. & Prof. Code §§ 5801, 5802(b) |
| Regulator | The California Council for Interior Design Certification, established by statute rather than as a state licensing board | Cal. Bus. & Prof. Code, div. 3, ch. 3.9, Interior Designers, §§ 5800 to 5812, principally §§ 5800, 5801, 5801.1, 5802, 5803, 5805, 5810 and 5811, current text including the amendments by Stats. 2023, ch. 723 (SB 816) effective January 1, 2024 and the sunset added by Stats. 2022, ch. 311 (SB 1437). California licenses no interior designers and no state board issues interior design regulations |
Is a seal required in California?
California does not license or register interior designers through a state board, and there is no Department of Consumer Affairs interior design license. What California has instead is a statutory title and a statutory stamp administered by a private council. Business and Professions Code chapter 3.9, sections 5800 through 5812, defines a Certified Interior Designer and establishes the California Council for Interior Design Certification to issue the stamp. Section 5801 provides that a Certified Interior Designer “may obtain a stamp from the council,” which is permissive. Section 5802(a) is not: “All drawings, specifications, or documents prepared for submission to any government regulatory agency by any Certified Interior Designer, or under their supervision shall be affixed by a stamp, as specified in Section 5801, and signed by that Certified Interior Designer.” So the stamp is optional until the work goes to a government agency, at which point it is mandatory for a person holding the certification. An uncertified interior designer in California has no stamp and no duty to obtain one.
What must appear on the seal
- A number that uniquely identifies you
- Your name
- Certified Interior Designer, or Certified Interior Designer with commercial designation
Nothing about the face is a matter of choice, because the licensee does not commission the device. Section 5801 requires the stamp to include a number that uniquely identifies and bears the name of the Certified Interior Designer and to identify that individual as either a Certified Interior Designer or a Certified Interior Designer with commercial designation, the second form depending on the requirements in section 5811.1(a)(2). The stamp itself certifies that the council holds evidence of the holder’s education, experience and examination. Section 5802(b) adds a labeling duty on the documents rather than the die: “All documents shall be identified as interior design documents, which are not architectural or engineering documents.”
Size and shape
Not addressed in statute. Chapter 3.9 prescribes content, not dimensions, and there is no California Code of Regulations chapter for interior design because no state board issues rules. Checked Business and Professions Code sections 5800 through 5812 in full. The physical specification is set by the council that issues the stamp, under the issuance procedure that section 5801.1 subjects to occupational analysis and examination validation every five to seven years.
Embosser, rubber stamp or digital
Not a purchase decision. Section 5801 has the Certified Interior Designer “obtain a stamp from the council,” which means the device is issued by the California Council for Interior Design Certification rather than ordered from a stamp supplier. A California interior designer who walks into a stamp shop is in the wrong place; the route runs through the council’s certification process. Section 5811(b) reinforces that the council is performing a public function by subjecting the meetings of the council issuing stamps under section 5801 to the Bagley-Keene Open Meeting Act.
Signing and dating
Stamp and signature together, with no dating rule. Section 5802(a) requires the documents to be affixed by the stamp “and signed by that Certified Interior Designer.” Nothing in chapter 3.9 requires a date beside the stamp, requires the signature to cross the impression, or addresses an electronic signature. The one additional marking duty is section 5802(b), which requires the documents to be identified as interior design documents and not architectural or engineering documents.
You cannot buy this stamp, and the statute behind it expires
Every other design profession in California sends the licensee to a supplier. Section 411(c) tells engineers and surveyors the seal may be obtained from any source; section 136(a) tells architects the same; section 2606 tells landscape architects the stamp may be purchased from any convenient source. Interior design is the exception. Section 5801 says the Certified Interior Designer “may obtain a stamp from the council.” The California Council for Interior Design Certification issues the device, and the stamp itself functions as proof that the council holds evidence of the holder’s education, experience and examination.
Which documents must be sealed
Drawings, specifications or documents prepared for submission to any government regulatory agency by a Certified Interior Designer or under that person’s supervision. Work that never goes to a government agency is outside section 5802 altogether. Section 5805 preserves the right of Certified Interior Designers “or any other person” to submit interior design plans for commercial or residential buildings to local building officials, except as provided in section 5538, and directs the local building official to reference the California Building Standards Code in exercising discretion over acceptance. Section 5803 exempts a Certified Interior Designer from the Contractors State License Law in chapter 9 insofar as they are designing systems for work to be performed by a licensed contractor.
Electronic and digital seals
Not addressed. Chapter 3.9 says nothing about an electronic or digital stamp or signature, and there is no state board rule to supply the gap. Checked sections 5800 through 5812 in full. Where a California public agency accepts a digital signature, the standard that governs that agency is Government Code section 16.5 with the Secretary of State regulations at title 2 sections 22000 through 22005. Any electronic form of the council stamp is a matter for the council’s own issuance procedure.
Renewal, lapse and retirement
The whole chapter has an end date. Section 5810(b) provides that “This chapter shall remain in effect only until January 1, 2027, and as of that date is repealed,” and every section in chapter 3.9 carries the same repeal note. Unless the Legislature extends it, the statutory Certified Interior Designer title and the section 5802 stamping duty both end on that date. Nothing in the chapter addresses surrender of the stamp, a change of number, or what happens to the device if certification lapses; those sit with the council’s own issuance procedure under section 5801.1.
Firm requirements
Not applicable. California registers no interior design firm and issues no certificate of authorization, and no firm identifier belongs on the stamp. Section 5801 limits the stamp to a unique number, the individual’s name and the certification designation. The firm level duty is the document labeling rule in section 5802(b), which is about content, not identity.
What to check before you order
You do not order this device from a stamp supplier. Business and Professions Code section 5801 has you obtain the stamp from the California Council for Interior Design Certification once you hold the certification, and the stamp carries a unique number, your name, and either Certified Interior Designer or Certified Interior Designer with commercial designation. Use it, with your signature, on any drawing, specification or document going to a government regulatory agency, and label those documents as interior design documents that are not architectural or engineering documents. If a supplier offers to cut you a California interior designer stamp, that device is not the one section 5802 asks for. Watch the calendar as well: chapter 3.9 is repealed on January 1, 2027 by its own terms.
The regulator supplies the official device itself, so that part does not come from a stamp supplier. Go to the regulator named above for it.
What we can still make for you. The rule governs the official seal, not everything else that goes on a drawing or across a desk. Licensees on regulator-issued credentials regularly order supplemental devices from us: a raised embosser for the client copy or title sheet, a name and license block stamp, a "reviewed" or "as built" marker, a firm address stamp, or a duplicate of the official artwork for internal drafts where the official device would be inappropriate. None of those stands in for the seal, and none is what the rule restricts. Tell us what the regulator issued you and we will make the rest around it. Browse interior designer stamps and seals.
Frequently asked questions
Where do I get a California interior designer stamp?
From the California Council for Interior Design Certification, once you hold the certification. Business and Professions Code § 5801 routes the device through the council rather than through any supplier, and § 5811(b) reinforces that the council is performing a public function by subjecting its stamp-issuing meetings to the Bagley-Keene Open Meeting Act. A stamp cut to order by a shop is not the device § 5802 asks for.
Is the California interior designer stamp required?
Conditionally. Section 5801 says a Certified Interior Designer “may obtain a stamp,” which is permissive, and § 5802(a) makes the stamp and your signature mandatory on all drawings, specifications or documents prepared for submission to any government regulatory agency by you or under your supervision. An uncertified interior designer in California has no stamp and no duty to obtain one.
What appears on the California Certified Interior Designer stamp?
Three things, under § 5801: a number that uniquely identifies you, your name, and your identification as either a Certified Interior Designer or a Certified Interior Designer with commercial designation, the second depending on the requirements in § 5811.1(a)(2). None of that is a matter of choice, since you do not commission the device.
What size is the California interior designer stamp?
No dimension is stated. Chapter 3.9 prescribes content rather than geometry across §§ 5800 to 5812, and there is no California Code of Regulations chapter for interior design because no state board issues rules for it. The physical specification is set by the council that issues the stamp, under the issuance procedure that § 5801.1 subjects to occupational analysis and examination validation every five to seven years.
Does California license interior designers?
No. There is no state board and no Department of Consumer Affairs interior design license. What California has instead is a statutory title and a statutory stamp administered by a private council, created by Business and Professions Code chapter 3.9. Interior design practice itself is open.
Which California documents need the stamp?
Drawings, specifications or documents prepared for submission to any government regulatory agency by a Certified Interior Designer or under that person’s supervision. Work that never goes to a government agency sits outside § 5802 entirely. Section 5805 separately preserves the right of any person to submit interior design plans for commercial or residential buildings to local building officials, except as provided in § 5538, and directs the official to reference the California Building Standards Code in exercising discretion over acceptance.
Do I have to date the California stamp?
Nothing in chapter 3.9 requires it. Section 5802(a) requires the documents to be affixed by the stamp “and signed by that Certified Interior Designer,” and says nothing about a date, about the signature crossing the impression, or about an electronic signature. The one additional marking duty is § 5802(b), the requirement to identify the documents as interior design documents that are not architectural or engineering documents.
Can I use the California stamp electronically?
Chapter 3.9 says nothing about an electronic or digital stamp or signature, and there is no state board rule to fill that in. Where a California public agency accepts a digital signature, the standard that governs that agency is Government Code § 16.5 with the Secretary of State regulations at title 2 §§ 22000 to 22005. Any electronic form of the council stamp is a matter for the council’s own issuance procedure under § 5801.1.
Does the California chapter really expire?
It does by its own terms. Section 5810(b) provides that the chapter remains in effect only until January 1, 2027 and is repealed on that date, and every section in chapter 3.9 carries the same repeal note. Unless the Legislature extends it, the statutory Certified Interior Designer title and the § 5802 stamping duty both end then. Worth factoring into anything you are planning past that date.
What happens to the stamp if my California certification lapses?
Chapter 3.9 does not address surrender of the stamp, a change of number, or what becomes of the device on lapse. Those questions sit with the council’s own issuance procedure under § 5801.1, which is where to direct them.
Does a California interior design firm get a stamp or a number?
No. California registers no interior design firm and issues no certificate of authorization, and § 5801 limits the stamp to a unique number, the individual’s name and the certification designation. The firm-level duty is the document labeling rule in § 5802(b), which is about content rather than identity. Section 5803 separately exempts a Certified Interior Designer from the Contractors State License Law in chapter 9 insofar as they are designing systems for work to be performed by a licensed contractor.
