A Missouri landscape architect seal must be a 1-3/4 inch circle with two concentric circles, the legends State of Missouri and Professional Landscape Architect, your licensed name, and a license number that begins with PLA. Rubber stamps, embossing seals and computer-generated images are all allowed if they match in size, design and content. This page covers the face, devices, signing, sealed documents and lapse.
Engineer Seal Stamps compliance desk. Checked against 20 CSR 2030-3.060(1) and the Board for Architects, Professional Engineers, Professional Land Surveyors, and Professional Landscape Architects. Sources read September 2026.
| Requirement | What the rule says | Source |
|---|---|---|
| Diameter | A circle one and three-quarters inches across. | 20 CSR 2030-3.060(1) |
| License number | Your number, with the letters PLA placed in front of it. | 20 CSR 2030-3.060(1) |
| Name | Your name in the form under which you are licensed. | 20 CSR 2030-3.060(1) |
| Legends | State of Missouri, and the profession named as Professional Landscape Architect. | 20 CSR 2030-3.060(1) |
| Border | Two concentric circles. | 20 CSR 2030-3.060(1) |
| Devices | Rubber stamp, embossing seal or computer-generated image, each matching the section (1) seal in size, design and content. | 20 CSR 2030-3.060 |
| Signing | At least your signature and the date the document was first sealed. | 20 CSR 2030-3.060(3) |
| Documents | Every final technical submission. The statute's examples run from drawings and specifications to plats, surveys and exhibits, plus reports and construction certifications. | § 327.411.1,.3,.4, RSMo |
| Electronic signing | No technology and no standard is named. | 20 CSR 2030-3.060(3) |
| Lapse | Silent on the seal after lapse, revocation or surrender; no duty to destroy or return it. | § 327.411, RSMo, and 20 CSR 2030-3 (silent) |
Licensed in more than one place? Check each jurisdiction in landscape architect seal requirements by state.
What must appear on a Missouri landscape architect seal?
Five elements under 20 CSR 2030-3.060(1): two concentric circles, the words State of Missouri, the words Professional Landscape Architect, the name you are licensed under and your license number led by PLA. All five belong on every Missouri landscape architect seal.
The profession wording is three words, Professional Landscape Architect, and it appears in that form. Your name should match your license, since the rule asks for the name as licensed rather than a nickname or a firm name. Our article on the Missouri landscape architect stamp explains the seal's purpose in plain terms.
How is the license number written on a Missouri seal?
With the prefix PLA in front of it. 20 CSR 2030-3.060(1) calls for your license number prefixed PLA, so a bare number, or a number carrying some other prefix, does not match the design the rule sets out.
When you send your details, give the digits exactly as your license shows them and confirm PLA should precede them. The proof should show PLA followed by your number as a single entry. Our post on Missouri landscape architect licensing covers the license itself.
How large is the Missouri landscape architect seal?
1-3/4 inches in diameter, and circular. 20 CSR 2030-3.060(1) states the size as one and three-quarters inches, a single figure, so every Missouri landscape architect seal should be made to that diameter.
All five elements have to fit inside that circle, and the profession wording is the longest of them. Check the proof for spacing so Professional Landscape Architect reads clearly at 1-3/4 inches, rather than asking for a larger seal that would no longer match the rule.
Which devices can apply the Missouri seal?
A rubber stamp, an embossing seal or a computer-generated image. 20 CSR 2030-3.060 allows each of them, on the condition that the device is identical in size, design and content to the seal described in section (1).
The identical-content condition means every device you own shows the same five elements at the same 1-3/4 inch size. If you keep a stamp for paper and an image for files, order them from one layout so they cannot drift apart. Our post on Missouri landscape architect regulations gives wider context.
Can a Missouri seal be applied electronically?
Yes, as a computer-generated image that matches the seal's size, design and content. For electronic signing, 20 CSR 2030-3.060(3) names no particular technology and no standard, so the rule does not point you to any specific product.
Use the same layout for the image as for your stamp, placed at full size. Because no electronic standard is set, the obligations that remain are the ones the rule does state: the image must match the seal, and your signature and the original sealing date go with it.
What must accompany the seal on a Missouri document?
At a minimum, your signature and the date the document was originally sealed. 20 CSR 2030-3.060(3) sets those two items as the baseline for a sealed document, and neither one is optional.
The date is the original sealing date. If a sheet is reprinted or reissued later, the rule's wording points to the day you first sealed it rather than the day of the reprint. Build a date field next to the signature line in your title block so it is filled in when the seal goes on.
Which Missouri documents must be sealed?
All final technical submissions, under section 327.411.1, RSMo. The statute's examples cover drawings and specifications as well as plats, surveys and exhibits, plus reports and construction certifications.
The duty is framed around final submissions, and the list reaches well past drawing sheets. Plan for the seal, your signature and the original sealing date on each document type named, including reports and exhibits that often lack a title block. The citation for this duty is § 327.411.1,.3,.4, RSMo.
What happens to a Missouri seal after a license lapses?
The rules are silent. Section 327.411, RSMo, and 20 CSR 2030-3 say nothing about what becomes of the seal when a license lapses, is revoked or is surrendered. Neither tells you to destroy the device or send it back.
That silence covers the device only; it says nothing either way about sealing while a license is inactive. Store the seal securely, keep the license current, and confirm your details are unchanged before you reorder. The source line for this point is § 327.411, RSMo, and 20 CSR 2030-3 (silent).
What should you send with a Missouri seal order?
Your name exactly as licensed, your license number for the PLA entry and your device choice: rubber stamp, embossing seal or computer-generated image. The 1-3/4 inch size and the wording are fixed by 20 CSR 2030-3.060(1).
If you order more than one device, put them on one order so each matches the others in size, design and content, as 20 CSR 2030-3.060 requires. Check the proof for both legends and the PLA prefix before approving production.
How do you check a Missouri impression before first use?
Measure the seal at 1-3/4 inches across, confirm there are two concentric circles, and read both legends, your name and the PLA number against your license.
Then sign and date a test impression the way you will on real documents, using the original sealing date. For an embossing seal, check the raised letters under angled light; for a computer-generated image, print at full size and measure it the same way as a stamp.
Frequently asked questions
Can my embosser be slightly larger than my rubber stamp?
No. 20 CSR 2030-3.060 requires each device to be identical in size, design and content to the section (1) seal, so an embosser and a stamp should both measure 1-3/4 inches.
Can I add my firm name to the Missouri seal?
The rule lists five elements, and a firm name is not among them. Since each device has to match the section (1) design and content, a firm name would take the seal away from that design.
Are a signature and date all the rule asks for beside the seal?
They are the floor. 20 CSR 2030-3.060(3) frames your signature and the original sealing date as a minimum, and it does not list anything further.
Who regulates Missouri landscape architect seals?
The Board for Architects, Professional Engineers, Professional Land Surveyors, and Professional Landscape Architects, the board this page was checked against.
Does the Missouri seal show an expiration date?
No expiration date is among the five elements 20 CSR 2030-3.060(1) lists. The face carries the circles, the two legends, your name and your PLA number.
With your name and license number confirmed, order a 1-3/4 inch seal from our Missouri stamps and seals collection.
