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 Landscape Architects Technical Committee, under the California Architects Board and Cal. Bus. & Prof. Code § 5659 on 21 September 2026 · Updated 21 September 2026
Two dates and a signature line, all on the stamp. Business and Professions Code section 5659 requires a device bearing your name, your license number, the legend licensed landscape architect, the legend State of California, “and a means of providing a signature, the renewal date of the license, and date of signing and sealing or stamping.” That is three writable elements, two of them dates that mean different things. The renewal date comes off your license and changes every cycle. The signing date changes with every document. A stamp with one blank line cannot carry both, and a stamp with a renewal date engraved into it does not survive renewal.
The size is bounded at both ends. Title 16 section 2606 says the stamp “shall be between one (1) and two (2) inches in diameter,” which matches the California architect stamp and is unlike the engineer, surveyor and geologist seals in the same title, which state only a one and one half inch floor and no ceiling. Section 2606 also requires the device to be “of the design illustrated here,” so the arrangement gets copied from the figure printed in the rule rather than invented.
The wording is recent. Stats. 2021, ch. 188 (SB 826) amended section 5659 effective January 1, 2022, and that is where the date of signing requirement comes from. Guidance written before then, and stamps ordered before then, will not show a signing date line. A repealed rule also still circulates: title 16 section 2607 has been repealed, and the live sources are section 5659 and section 2606.
California landscape architect seal requirements at a glance
| Requirement | California rule | Source |
|---|---|---|
| Seal required | Yes | Cal. Bus. & Prof. Code § 5659 |
| Required elements | Your name as licensed; Your license number; The legend licensed landscape architect; The legend State of California; A means of providing a signature; The renewal date of your license; The date of signing and sealing or stamping | Cal. Bus. & Prof. Code § 5659 |
| Size and shape | Between one and two inches in diameter. | Cal. Code Regs. tit. 16, § 2606 |
| Device allowed | Section 2606 allows the stamp to be “purchased by the landscape architect from any convenient source” and does not restrict the device type by name. | Cal. Bus. & Prof. Code § 5659 |
| Signature and date | Sign, date, and seal. | Cal. Bus. & Prof. Code §§ 5659, 5673 |
| What must be sealed | All plans, specifications and other instruments of service prepared for others. | Cal. Bus. & Prof. Code § 5659 |
| Electronic seal | Not addressed. Neither Business and Professions Code section 5659 nor title 16 section 2606 mentions an electronic or digital stamp or an electronic signature, and the Committee publishes no digital sealing rule. | Cal. Bus. & Prof. Code § 5659 |
| Renewal and lapse | The renewal date is part of the required content, so the device has to accommodate a date that changes every cycle. | Cal. Bus. & Prof. Code § 5659 |
| Firm requirements | Not applicable. | Cal. Bus. & Prof. Code § 5659 |
| Regulator | The California Landscape Architects Technical Committee, under the California Architects Board | Landscape Architects Practice Act, Cal. Bus. & Prof. Code §§ 5600 to 5681, principally §§ 5659 (as amended by Stats. 2021, ch. 188, SB 826) and 5673 |
Is a seal required in California?
Business and Professions Code section 5659 carries the whole duty in one sentence: each licensee “shall sign, date, and seal or stamp using a seal or stamp described in this section, all plans, specifications, and other instruments of service therefor, prepared for others as evidence of the person’s responsibility for those documents,” and failure is a ground for discipline. The same section then lists what the device must bear. The physical specification lives in California Code of Regulations title 16 section 2606, which sets the diameter and points to a design illustrated in the rule. Section 5659 was amended by Stats. 2021, ch. 188 (SB 826), effective January 1, 2022, which is when the date of signing joined the required content.
What must appear on the seal
- Your name as licensed
- Your license number
- The legend licensed landscape architect
- The legend State of California
- A means of providing a signature
- The renewal date of your license
- The date of signing and sealing or stamping
Section 5659 is unusually demanding because it folds the signature and two different dates into the description of the device itself. It requires a seal or stamp bearing the name, the license number, the legend licensed landscape architect, the legend State of California, “and a means of providing a signature, the renewal date of the license, and date of signing and sealing or stamping.” Two dates therefore appear: the license renewal date, which changes each cycle, and the date the licensee signs, which changes with every document. Section 2606 requires the device to be “of the design illustrated here,” so the arrangement must be copied from the figure printed in the rule rather than invented. Adding a specialty line, a firm name or a certificate of authorization number is not part of the illustrated design.
Size and shape
Between one and two inches in diameter. Section 2606 states both ends: the stamp “shall be between one (1) and two (2) inches in diameter.” That is a true range with a ceiling, matching the California architect stamp and unlike the engineer, surveyor and geologist seals, which state only a one and one half inch floor.
Embosser, rubber stamp or digital
Section 2606 allows the stamp to be “purchased by the landscape architect from any convenient source” and does not restrict the device type by name. Section 5659 speaks of a seal or stamp and of a means of providing a signature, which is satisfied by a block with ruled lines. The safe buy is a self inking rubber stamp sized within the one to two inch range, laid out to the illustrated design, with blank lines for the signature, the renewal date and the date of signing. Neither the statute nor the rule authorizes a stamped facsimile of the signature; the signature line exists so that a real signature can be applied.
Signing and dating
Sign, date, and seal. Section 5659 requires all three on every plan, specification and instrument of service prepared for others, and requires the device to provide the means for the signature and for the date of signing and sealing or stamping. There is no separate placement rule directing the signature across the impression. Section 5673 supplies the discipline: it is a ground for disciplinary action to affix a signature or stamp, or permit use of the name, on plans, drawings, specifications or other instruments of service “which have not been prepared by him or her or under his or her immediate and responsible direction,” or to lend the name, signature or stamp to help a non licensee evade the chapter.
Two dates and a signature line, all on the stamp
Most seal statutes describe a ring of text. California’s landscape architect statute describes a block. Section 5659 requires a device bearing the name, the license number, the legend licensed landscape architect, the legend State of California, and then “a means of providing a signature, the renewal date of the license, and date of signing and sealing or stamping.” Three writable elements, two of them dates that mean different things. The renewal date comes off the license and changes every cycle. The date of signing changes with every document. A stamp that offers only one blank line cannot satisfy both.
Which documents must be sealed
All plans, specifications and other instruments of service prepared for others. Section 5659 draws no line between preliminary and final work and states no exemption for drafts, so the duty attaches to the instruments of service themselves. Note that a repealed rule once covered this ground separately: title 16 section 2607, Signature, Date of Execution, License Number, has been repealed, and stale guidance still cites it. The live authorities are section 5659 and section 2606.
Electronic and digital seals
Not addressed. Neither Business and Professions Code section 5659 nor title 16 section 2606 mentions an electronic or digital stamp or an electronic signature, and the Committee publishes no digital sealing rule. Checked the Landscape Architects Practice Act as published by the Committee and the title 16 division 26 regulations it lists. Where a California public entity chooses to accept a digital signature, Government Code section 16.5 and the Secretary of State regulations at title 2 sections 22000 through 22005 govern that agency, approving public key cryptography and signature dynamics. That standard binds the receiving agency rather than the landscape architect.
Renewal, lapse and retirement
The renewal date is part of the required content, so the device has to accommodate a date that changes every cycle. A stamp built with a blank renewal line survives renewal; a stamp with the renewal date engraved into the die does not. The license number does not change on renewal. Neither section 5659 nor section 2606 requires surrender or destruction of the stamp on lapse, retirement, suspension or revocation, and neither addresses reissue of a different number. Not addressed.
Firm requirements
Not applicable. California issues no landscape architecture firm license or certificate of authorization, and no firm number belongs on the stamp. Section 5659 lists a closed set of content, all of it personal to the licensee. Firm identity belongs in the title block.
What to check before you order
Order a stamp between one and two inches across, laid out to the design illustrated at title 16 section 2606. The face carries your name as licensed, your license number, the legend licensed landscape architect and the legend State of California, plus three blank lines: one for your signature, one for the renewal date of your license, and one for the date you sign and seal. Ask for blank lines rather than engraved dates, so the device survives renewal and serves every document. Leave off any firm name or certificate number. You may buy from any convenient source and the Committee asks the supplier for no proof of licensure.
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Frequently asked questions
Is a stamp required for landscape architects in California?
Yes, and failure is a ground for discipline. Business and Professions Code section 5659 provides that each licensee “shall sign, date, and seal or stamp using a seal or stamp described in this section, all plans, specifications, and other instruments of service therefor, prepared for others as evidence of the person’s responsibility for those documents.” The physical specification lives in California Code of Regulations title 16 section 2606.
What has to appear on a California landscape architect stamp?
Seven items under section 5659: your name as licensed, your license number, the legend licensed landscape architect, the legend State of California, a means of providing a signature, the renewal date of your license, and the date of signing and sealing or stamping. Section 2606 requires the device to be of the design illustrated in the rule, so the layout is copied from the figure. Adding a specialty line, a firm name or a certificate of authorization number is not part of the illustrated design.
What size is a California landscape architect stamp?
Between one and two inches in diameter. Title 16 section 2606 states both ends of the range, which makes this different from the California engineer, surveyor and geologist seals, where only a one and one half inch minimum is given. Within that range you pick the size that keeps two date lines and a signature line usable.
Why does my California stamp need two different dates?
Because section 5659 asks for two different things. The renewal date of the license is a fact about your license and changes each cycle. The date of signing and sealing or stamping is a fact about the document in front of you and changes every time. Order the stamp with blank lines for both rather than engraved dates, so the device survives renewal and serves every document.
Can I buy a California landscape architect stamp from any supplier?
Yes. Section 2606 allows the stamp to be “purchased by the landscape architect from any convenient source” and the Committee asks the supplier for no proof of licensure. The rule does not restrict the device type by name, and section 5659 speaks of a seal or stamp and of a means of providing a signature, which a block with ruled lines satisfies. A self inking rubber stamp sized within the one to two inch range is the practical buy.
Can the signature on a California stamp be a facsimile?
Neither the statute nor the rule authorizes a stamped facsimile of the signature. The signature line exists so that a real signature can be applied. Section 5673 supplies the discipline: it is a ground for disciplinary action to affix a signature or stamp, or permit use of your name, on plans, drawings, specifications or other instruments of service “which have not been prepared by him or her or under his or her immediate and responsible direction,” or to lend the name, signature or stamp to help a non licensee evade the chapter.
Which California documents have to be stamped?
All plans, specifications and other instruments of service prepared for others. Section 5659 draws no line between preliminary and final work and states no exemption for drafts, so the duty attaches to the instruments of service themselves. Stale guidance sometimes cites title 16 section 2607, Signature, Date of Execution, License Number, which has been repealed.
Is there a digital stamp rule for California landscape architects?
Not in the practice act or the regulations. Neither section 5659 nor title 16 section 2606 mentions an electronic or digital stamp or an electronic signature, and the Committee publishes no digital sealing rule. Where a California public entity chooses to accept a digital signature, Government Code section 16.5 and the Secretary of State regulations at title 2 sections 22000 through 22005 govern that agency and approve public key cryptography and signature dynamics. That standard binds the receiving agency rather than you.
Does my California stamp have to change when I renew?
The renewal date on it does. Since the renewal date is part of the required content, a stamp built with a blank renewal line survives renewal and one with the date engraved into the die does not. Your license number does not change on renewal. Neither section 5659 nor section 2606 requires surrender or destruction of the stamp on lapse, retirement, suspension or revocation.
Does a California landscape architecture firm need its own stamp?
No. California issues no landscape architecture firm license or certificate of authorization, and no firm number belongs on the stamp. Section 5659 lists a closed set of content, all of it personal to the licensee. Firm identity belongs in the title block.
