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 Iowa Engineering and Land Surveying Examining Board and Iowa Code § 542B.16 on 21 September 2026 · Updated 28 October 2026
An Iowa seal on its own does not finish the job. Iowa Admin. Code r. 481-1050.1(3) prescribes a certification block that sits beside the seal and carries the certification sentence, the signature, the date, the printed or typed name, the license number, the line “My license renewal date is December 31, ____” and a list of the pages or sheets the seal covers. A perfect seal on a document with no certification block is still a noncompliant submission, and the engineering block and the land surveying block are worded differently.
Then there is the ink. Rule 481-1050.1(4) requires that “Except for the original signature and handwritten date in contrasting ink color, the information requested in each certification block must be typed or legibly printed in permanent ink on each official copy.” A black pen on a black printed block does not satisfy the rule as written.
On the die itself, Iowa names three elements and one forbidden pair of words. The seal carries your name, your Iowa license number and the words professional engineer or professional land surveyor. The word licensed may be added but is not required, and “Neither the word ‘registrant’ nor ‘registered’ may be used on the seal.” Iowa stopped registering and started licensing, so an old die reproduces a prohibited word. Acorn cuts this seal to 1-3/4 inches. That is our production record rather than an Iowa rule; r. 481-1050.1(1) asks only that the seal substantially conform to unscaled samples.
Iowa PE seal requirements at a glance
| Requirement | Iowa rule | Source |
|---|---|---|
| Seal required | Yes | Iowa Code § 542B.16 |
| Required elements | Your name, Your Iowa license number and The words professional engineer or professional land surveyor | Iowa Code § 542B.16(1) |
| Size and shape | Acorn cuts this seal to 1-3/4 inches, and that is a production record rather than a published rule. | Acorn Sales production record, Iowa professional engineer seal |
| Device allowed | Iowa Code section 542B.16(1) provides that “A legible rubber stamp or other facsimile of the seal may be used and shall have the same effect as the use of the actual seal.” Iowa Admin. | Iowa Code § 542B.16(1) |
| Signature and date | Iowa wants an original signature and an original handwritten date, and it wants them in a different ink color from everything else. | Iowa Admin. Code r. 481-1050.1(3), (4) |
| What must be sealed | All engineering documents and land surveying documents under Iowa Code section 542B.16(2). | Iowa Admin. Code r. 481-1050.1(3), (5) |
| Electronic seal | Iowa Admin. | Iowa Admin. Code r. 481-1050.1(8) |
| Renewal and lapse | Iowa Code section 542B.18 provides that certificates of licensure expire in intervals determined by the board, that failure to renew in the month of expiration does not deprive a person of the right of renewal, and that a person who misses the expiration date may renew within thirty days following it, subject to a reasonable penalty. | Iowa Code §§ 542B.16(5), 542B.18 |
| Firm number on documents | Not applicable. | Iowa Code § 542B.26 (no certificate of authorization anywhere in ch. 542B) |
| Licensing board | The Iowa Engineering and Land Surveying Examining Board | Iowa Admin. Code ch. 481-1050 (Seal |
Rules for other states are on PE stamp requirements by state.
Is a seal required in Iowa?
Iowa requires a seal Iowa Code section 542B.16(1) requires each licensee, upon licensure, to “obtain a seal of a design approved by the board, bearing the licensee’s name, Iowa license number, and the words ‘professional engineer’ or ‘professional land surveyor’ or both, as the case may be.” Section 542B.16(2) then requires that all engineering documents and land surveying documents be dated and contain the signature of the licensee in responsible charge, a certification that the work was done by the licensee or under the licensee’s direct personal supervision, and “The Iowa legible seal of the licensee.” Section 542B.16(3) bars any Iowa agency, subdivision, or municipal corporation from filing for record or approving a document that does not comply.
What must appear on the seal
- Your name
- Your Iowa license number
- The words professional engineer or professional land surveyor
Iowa has one optional word and one prohibited pair. Iowa Admin. Code r. 481-1050.1(2) provides that “The word ‘licensed’ may be added but is not required on the seal,” and then forbids the obvious alternative: “Neither the word ‘registrant’ nor ‘registered’ may be used on the seal.” Iowa stopped registering and started licensing, and a seal carrying the old vocabulary is noncompliant rather than merely dated. A licensee holding both credentials may carry both titles on one seal. The seal itself carries no expiration date and no renewal date; that information belongs in the certification block instead.
Size and shape
Acorn cuts this seal to 1-3/4 inches, and that is a production record rather than a published rule. The state publishes no dimension, so the figure below is what we make and ship for Iowa licensees rather than something you can point a reviewer at. Iowa Admin. Code r. 481-1050.1(1) asks only that the seal substantially conform to samples reproduced as images with no printed dimension, so substantially conform is the whole of the instruction. What the state publishes: Iowa Admin. Code r. 481-1050.1(1) states only that the seal “should substantially conform to the samples shown below,” and the samples are reproduced as images in the rule with no printed dimension. Iowa Code section 542B.16 gives no diameter, requiring only that the seal be legible. The sources here are the full text of Iowa Admin. Code chapter 481-1050 as published by the Iowa Legislature, Iowa Code chapter 542B, and the Engineers and Land Surveyors page maintained by the Iowa Department of Inspections, Appeals, and Licensing. None states a size. A supplier should build to the board sample artwork and to the legibility test in section 542B.16(2)(c).
Embosser, rubber stamp or digital
Iowa Code section 542B.16(1) provides that “A legible rubber stamp or other facsimile of the seal may be used and shall have the same effect as the use of the actual seal.” Iowa Admin. Code r. 481-1050.1(7) adds that “Computer-generated seals may be used on final original documents.” A rubber stamp is the safe buy and is expressly given the same legal effect as an embossed seal. Legibility, not the device, is the statutory test.
Signing and dating
Iowa wants an original signature and an original handwritten date, and it wants them in a different ink color from everything else. Iowa Admin. Code r. 481-1050.1(4) provides that “Except for the original signature and handwritten date in contrasting ink color, the information requested in each certification block must be typed or legibly printed in permanent ink on each official copy.” Rule 481-1050.1(3) confirms that “The seal and original signature only need to be applied to a final submission.” The date is the date of signing, entered by hand. An electronic signature under Iowa Code chapter 554D is the alternative under rule 481-1050.1(8).
The certification block does the work in Iowa, and the board cites the rule under a chapter number that changed in 2026
Iowa does not rely on a seal carrying every required fact. Iowa Admin. Code r. 481-1050.1(3) prescribes the exact wording of a certification block that sits beside the seal and carries the certification sentence, the signature, the date, the printed or typed name, the license number, the line “My license renewal date is December 31, ____”, and a list of the pages or sheets covered by the seal. The engineering block and the land surveying block have different wording, and for maps or acquisition plats prepared from public records or previous measurements by others, the land surveying block may be modified by removing the phrase “and the related survey work was performed.” A perfectly made Iowa seal on a document with no certification block is still a noncompliant submission.
Rule 481-1050.1(4) then adds the contrasting ink requirement. Everything in the block except the original signature and the handwritten date must be typed or legibly printed in permanent ink, and the signature and date must be in a contrasting ink color. Blue ink on a black printed block is the conventional answer. A black pen signature on a black printed block does not satisfy the rule as written.
The citation itself is the current trap. Iowa’s engineering and land surveying rules lived at 193C for decades. Pursuant to 2023 Iowa Acts, Senate File 514, the board’s rules were editorially transferred in the Iowa Administrative Bulletin of 24 June 2026 to agency 481, chapters 1045 through 1057. The seal rule that was 193C chapter 6 is now Iowa Admin. Code chapter 481-1050, rule 481-1050.1(542B). Any reference to 193C-6.1 or to 193C-1.30 describes the right requirement under a number that no longer exists.
Last, the vocabulary. Rule 481-1050.1(2) permits the word licensed on the seal and forbids registrant and registered. A licensee reusing an old Iowa die, or a supplier working from an old template, reproduces a prohibited word.
Which documents must be sealed
All engineering documents and land surveying documents under Iowa Code section 542B.16(2). The mechanism is a certification block rather than a bare seal. Iowa Admin. Code r. 481-1050.1(3) places the certification block on the first page or attached cover sheet of the official copy, requires a block for the licensee in responsible charge and for each contributing professional consultant, and permits a table identifying contributing professionals and where their blocks appear in place of individual front page blocks. Each official copy must be stapled, bound, or otherwise attached so as to establish the complete extent of the submission. Each block displays the seal and designates the portion of the submission the licensee is responsible for. Any nonfinal submission to a client or public agency “shall be clearly labeled ‘preliminary’ or ‘draft.’” Revisions become part of the official copy and must themselves be identified on a certification block with seals applied.
Electronic and digital seals
Iowa Admin. Code r. 481-1050.1(8) ties the standard to state electronic transactions law rather than to a named vendor technology. An electronic signature as defined in or governed by Iowa Code chapter 554D meets the rule if it is protected by a security procedure as defined in Iowa Code section 554D.103(14), “such as digital signature technology.” The licensee must ensure, before affixing the signature, that the procedures are adequate to verify the signature is that of a specific person and to detect any changes made or attempted after that person signed.
Renewal, lapse and retirement
Iowa Code section 542B.18 provides that certificates of licensure expire in intervals determined by the board, that failure to renew in the month of expiration does not deprive a person of the right of renewal, and that a person who misses the expiration date may renew within thirty days following it, subject to a reasonable penalty. Section 542B.16(5) provides that violation of the seal section by a licensee “shall be deemed fraud and deceit in the licensee’s practice.” The license number does not change on renewal and the seal carries no date, so an Iowa seal does not need replacing on renewal; the renewal date is written into the certification block instead, where it is updated document by document.
Firm registration
Not applicable. Iowa issues no certificate of authorization and no firm permit for engineering or land surveying. Iowa Code chapter 542B contains no business entity registration provision. The corporate question is handled by section 542B.26(1), which exempts a full time employee of a corporation doing work for that corporation, “except in the case of corporations offering their services to the public as professional engineers or professional land surveyors,” and provides that corporations designing buildings or works for interests not their own are practicing engineering, in which case all principal designing or constructing engineers must hold Iowa certificates of licensure. Documents therefore carry individual seals and certification blocks only.
What to check before you order
You will need to supply your name, your Iowa license number, and whether the seal reads professional engineer, professional land surveyor, or both. The word licensed is optional; registrant and registered are prohibited. No dimension is stated anywhere in Iowa law, so the seal is built to the sample artwork in Iowa Admin. Code r. 481-1050.1(1) and to the statutory legibility test, and any diameter you are quoted is a shop standard rather than an Iowa requirement. A rubber stamp has the same legal effect as an embossed seal under Iowa Code section 542B.16(1). If you are also ordering title block or certification block templates, the block wording in rule 481-1050.1(3) is prescribed and differs between engineering and land surveying.
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Frequently asked questions
Is a PE seal required in Iowa?
Yes. Iowa Code § 542B.16(1) requires each licensee on licensure to “obtain a seal of a design approved by the board, bearing the licensee’s name, Iowa license number, and the words ‘professional engineer’ or ‘professional land surveyor’ or both, as the case may be.” Section 542B.16(2) requires all engineering and land surveying documents to be dated and to contain the signature of the licensee in responsible charge, a certification that the work was done by the licensee or under the licensee’s direct personal supervision, and “The Iowa legible seal of the licensee.” Section 542B.16(3) bars any Iowa agency, subdivision or municipal corporation from filing for record or approving a document that does not comply.
What wording goes on an Iowa PE seal?
Your name, your Iowa license number and the words professional engineer, or professional land surveyor, or both where a licensee holds both credentials. Rule 481-1050.1(2) makes the word licensed optional and forbids registrant and registered outright. The seal carries no expiration date and no renewal date; that information belongs in the certification block instead.
What size is an Iowa PE seal?
Not addressed. Iowa Admin. Code r. 481-1050.1(1) says only that the seal “should substantially conform to the samples shown below,” and the samples are reproduced as images with no printed dimension. Iowa Code § 542B.16 gives no diameter and requires only that the seal be legible. The full text of chapter 481-1050 as published by the Iowa Legislature, Iowa Code chapter 542B and the Engineers and Land Surveyors page maintained by the Iowa Department of Inspections, Appeals, and Licensing were all checked, and none states a size. Build to the board sample artwork and to the legibility test in § 542B.16(2)(c), and be wary of any supplier quoting a required Iowa diameter. Acorn cuts this seal to 1-3/4 inches. That is our production record rather than an Iowa rule; r. 481-1050.1(1) asks only that the seal substantially conform to unscaled samples.
What size professional engineer stamp do regulations require?
PE stamp size is set state by state, and Iowa regulations set no diameter: Iowa Admin. Code r. 481-1050.1(1) points only to unscaled sample seals, and Iowa Code § 542B.16 asks for a legible seal. Acorn Sales makes Iowa PE seals at 1-3/4 inches, its production record rather than a state requirement. For the size rules in other states, see our PE stamp requirements by state guide.
Can I use a rubber stamp instead of an embosser in Iowa?
Yes, with the same legal effect. Iowa Code § 542B.16(1) provides that “A legible rubber stamp or other facsimile of the seal may be used and shall have the same effect as the use of the actual seal.” Rule 481-1050.1(7) adds that “Computer-generated seals may be used on final original documents.” Legibility, not the device, is the statutory test.
Where do the signature and date go on an Iowa document?
In the certification block, by hand, in a contrasting ink color. Rule 481-1050.1(4) requires everything in the block other than the original signature and handwritten date to be typed or legibly printed in permanent ink on each official copy, which leaves the signature and date as the two handwritten items and requires them to contrast. Rule 481-1050.1(3) confirms that “The seal and original signature only need to be applied to a final submission.” The date is the date of signing.
What is an Iowa certification block and where does it go?
It goes on the first page or an attached cover sheet of the official copy. Rule 481-1050.1(3) requires a block for the licensee in responsible charge and for each contributing professional consultant, and permits a table identifying contributing professionals and where their blocks appear in place of individual front page blocks. Each block displays the seal and designates the portion of the submission the licensee is responsible for, and each official copy must be stapled, bound or otherwise attached so as to establish the complete extent of the submission. The wording is prescribed, and the land surveying block may be modified for maps or acquisition plats prepared from public records or previous measurements by others by removing the phrase “and the related survey work was performed.”
How do drafts and revisions work in Iowa?
Any nonfinal submission to a client or public agency “shall be clearly labeled ‘preliminary’ or ‘draft,’” under rule 481-1050.1(5). Revisions become part of the official copy and must themselves be identified on a certification block with seals applied, so a revision is not a quiet edit to a sealed set.
Can I sign an Iowa engineering document electronically?
Yes, and the standard points at state law rather than at a vendor. Rule 481-1050.1(8) accepts an electronic signature as defined in or governed by Iowa Code chapter 554D where it is protected by a security procedure as defined in Iowa Code § 554D.103(14), “such as digital signature technology.” Before affixing the signature the licensee must be satisfied that the procedures are adequate to verify that the signature is that of a specific person and to detect any changes made or attempted after that person signed.
Do I need a new Iowa seal when I renew?
No. The license number does not change on renewal and the seal carries no date, so the device stays good; the renewal date is written into the certification block and updated document by document. Iowa Code § 542B.18 provides that certificates of licensure expire in intervals determined by the board, that failure to renew in the month of expiration does not deprive a person of the right of renewal, and that a person who misses the expiration date may renew within thirty days following it subject to a reasonable penalty. Section 542B.16(5) provides that violation of the seal section by a licensee “shall be deemed fraud and deceit in the licensee’s practice.”
Does an Iowa firm need a certificate of authorization?
No. Iowa issues no certificate of authorization and no firm permit for engineering or land surveying, and Iowa Code chapter 542B contains no business entity registration provision. Section 542B.26(1) handles the corporate question instead: it exempts a full time employee of a corporation doing work for that corporation “except in the case of corporations offering their services to the public as professional engineers or professional land surveyors,” and provides that corporations designing buildings or works for interests not their own are practicing engineering, in which case all principal designing or constructing engineers must hold Iowa certificates of licensure. Documents carry individual seals and certification blocks only.
Why do I see Iowa seal rules cited as 193C?
Because the chapter number changed. Iowa’s engineering and land surveying rules lived at 193C for decades. Pursuant to 2023 Iowa Acts, Senate File 514, the board’s rules were editorially transferred in the Iowa Administrative Bulletin of 24 June 2026 to agency 481, chapters 1045 through 1057. The seal rule that was 193C chapter 6 is now Iowa Admin. Code chapter 481-1050, rule 481-1050.1(542B). A reference to 193C-6.1 or to 193C-1.30 describes the right requirement under a number that no longer exists.
