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 Massachusetts Board of Registration of Professional Engineers and Professional Land Surveyors and M.G.L. c. 112, § 81M on 21 September 2026 · Updated 21 September 2026
When instruments of service are filed with public authorities in Massachusetts, each sheet must be individually signed, sealed and appropriately dated unless another statute says otherwise. 250 CMR 5.03 says so in terms. A signed and sealed cover sheet over an unsealed set does not comply, which turns the seal into a high-volume consumable: a forty sheet filing takes forty impressions and forty signatures, and the revision takes forty more.
The size is set on the artwork rather than the die. 250 CMR 5.03 provides that “The outside diameter of the depicted image must be approximately one and one half inches.” The governing word is approximately, so Massachusetts states a target rather than a tolerance band, and the measurement is of the depicted image rather than of the mount.
One wording conflict is live and worth stating rather than papering over. The statute at M.G.L. c. 112, § 81M gives the legend as “Registered Professional Engineer,” while 250 CMR 5.03 as extracted gives the seal contents as “Professional Engineer.” Both are primary sources. Take the face wording from the board’s currently authorized design, since the board is the body that authorizes the design under the statute.
Massachusetts PE seal requirements at a glance
| Requirement | Massachusetts rule | Source |
|---|---|---|
| Seal required | Yes | M.G.L. c. 112, § 81M |
| Required elements | “Commonwealth of Massachusetts”, Your name as registered, Your registration number and “Professional Engineer” | 250 CMR 5.03(1) |
| Size and shape | Approximately one and one half inches outside diameter. 250 CMR 5.03 states that “The outside diameter of the depicted image must be approximately one and one half inches.” The governing word is approximately, so Massachusetts sets a target rather than a tolerance band, and the measurement is of the depicted image rather than of the die or the mount. | 250 CMR 5.03 |
| Device allowed | Massachusetts is permissive on the device and says so in one sentence: “The seal must be a symbol or image in the form of a rubber stamp, embossed seal or digitized seal (computer generated image), or other form approved by the Board.” A rubber or self-inking stamp is the safe buy for paper work and is expressly named. | 250 CMR 5.03 |
| Signature and date | The signature sits next to the seal and must not cover it. 250 CMR 5.03(6) calls for either a “legible hand written Signature” or a “properly encrypted digital Signature” placed “adjacent to (not obscuring) the seal,” with the document “appropriately dated and signed.” The date accompanies the signature rather than being printed on the seal face. | 250 CMR 5.03(6) |
| What must be sealed | Instruments of service filed with public authorities, sheet by sheet: 250 CMR 5.03 and M.G.L. c. 112, § 81M. Two limits on what may be sealed are explicit. 250 CMR 5.03(3) allows a registrant to affix the seal “only to Instruments of Service produced by the Registrant personally or under the Registrant’s Direct Charge and Supervision.” 250 CMR 5.03(5) adds that “Under no circumstances shall a Registrant adopt the Work Products developed by unregistered persons who themselves were not working under the Direct Charge and Supervision of a Registrant,” which forecloses plan-stamping of outside drawings. 250 CMR 5.04 defines what direct charge and supervision means. | 250 CMR 5.03(3), (5) |
| Electronic seal | 250 CMR 5.03(11) sets a functional standard and names no product. | 250 CMR 5.03(6), (11) |
| Renewal and lapse | Certificates expire on June 30 of even-numbered years. | M.G.L. c. 112, § 81N |
| Firm number on documents | No firm seal and no certificate-of-authorization number on the document. 250 CMR 5.05 requires that a business entity offering engineering or land surveying services have a registered engineer or land surveyor with management responsibility for that part of the business, acting as the registrant in charge. | 250 CMR 5.05 |
| Licensing board | The Massachusetts Board of Registration of Professional Engineers and Professional Land Surveyors | M.G.L. c. 112, §§ 81D to 81T, read from the Massachusetts Legislature site, |
Rules for other states are on PE stamp requirements by state.
Is a seal required in Massachusetts?
Massachusetts requires a seal Massachusetts puts the duty in the statute and the detail in the regulation. M.G.L. c. 112, § 81M requires that “Each registrant hereunder shall, upon registration, obtain a seal of the design authorized by the board, bearing the registrant’s name and the legend ‘Registered Professional Engineer’” and provides that documents be stamped with that seal when filed with public authorities while the registrant’s certificate is in force. 250 CMR 5.03 supplies the design, the placement and the signature. The practical trigger is filing with a public authority, and at that point 250 CMR 5.03 requires that each sheet be individually signed, sealed and appropriately dated unless otherwise authorized by statute.
What must appear on the seal
- “Commonwealth of Massachusetts”
- Your name as registered
- Your registration number
- “Professional Engineer”
The licensed branch is optional. 250 CMR 5.03(1)(a) provides that the seal may include the registrant’s licensed branch, which means a civil, structural or mechanical designation is permitted but not required, and omitting it is not a defect. One wording conflict is worth flagging rather than resolving silently: the statute at M.G.L. c. 112, § 81M states the legend as “Registered Professional Engineer,” while 250 CMR 5.03 as extracted states the seal contains “Professional Engineer.” Both are primary. Take the face wording from the board’s currently authorized design rather than from either citation in isolation, because the board is the body that authorizes the design under the statute. The registration number is required by the regulation even though the statute does not mention it.
Size and shape
Approximately one and one half inches outside diameter. 250 CMR 5.03 states that “The outside diameter of the depicted image must be approximately one and one half inches.” The governing word is approximately, so Massachusetts sets a target rather than a tolerance band, and the measurement is of the depicted image rather than of the die or the mount.
Embosser, rubber stamp or digital
Massachusetts is permissive on the device and says so in one sentence: “The seal must be a symbol or image in the form of a rubber stamp, embossed seal or digitized seal (computer generated image), or other form approved by the Board.” A rubber or self-inking stamp is the safe buy for paper work and is expressly named. An embosser is equally legal. A digitized seal, meaning a computer generated image, is legal in its own right and is not treated as a lesser substitute, which is a meaningful difference from New Jersey.
Signing and dating
The signature sits next to the seal and must not cover it. 250 CMR 5.03(6) calls for either a “legible hand written Signature” or a “properly encrypted digital Signature” placed “adjacent to (not obscuring) the seal,” with the document “appropriately dated and signed.” The date accompanies the signature rather than being printed on the seal face. Where documents are filed with public authorities, the signing and sealing is per sheet: each sheet must be individually signed and sealed and appropriately dated unless otherwise authorized by statute, so a single signed cover sheet does not carry a set.
Every sheet, signed and sealed and dated individually
The Massachusetts rule that catches people out is not the design of the seal, which is ordinary, but the per-sheet duty. When instruments of service are filed with public authorities, 250 CMR 5.03 requires that each sheet be individually signed and sealed and appropriately dated unless another statute says otherwise. A signed and sealed cover sheet with the rest of the set unsealed does not comply.
Which documents must be sealed
Instruments of service filed with public authorities, sheet by sheet: 250 CMR 5.03 and M.G.L. c. 112, § 81M. Two limits on what may be sealed are explicit. 250 CMR 5.03(3) allows a registrant to affix the seal “only to Instruments of Service produced by the Registrant personally or under the Registrant’s Direct Charge and Supervision.” 250 CMR 5.03(5) adds that “Under no circumstances shall a Registrant adopt the Work Products developed by unregistered persons who themselves were not working under the Direct Charge and Supervision of a Registrant,” which forecloses plan-stamping of outside drawings. 250 CMR 5.04 defines what direct charge and supervision means. Preliminary, draft and not-for-construction documents are not addressed in 250 CMR 5.03; the regulation carries no marking requirement for them, which was confirmed by two separate readings of the board’s published 250 CMR 5.00 document on mass.gov. The exemptions from the practice requirement itself sit in M.G.L. c. 112, § 81R, which was not read in full.
Electronic and digital seals
250 CMR 5.03(11) sets a functional standard and names no product. A digital signature must have “an electronic authentication process attached to it that is uniquely associated with the Registrant, can be authenticated by the recipient, and is uniquely linked to the underlying documents in a manner that will invalidate the digital Signature if any part of the document is changed.” 250 CMR 5.03(6) separately accepts a “properly encrypted digital Signature” as an alternative to a handwritten one. No federal standard is incorporated by reference, so unlike New Jersey there is no FIPS citation to satisfy; the test is uniqueness, authentication by the recipient and tamper evidence. The digitized seal image itself is separately authorized as a form of seal under 250 CMR 5.03.
Renewal, lapse and retirement
Certificates expire on June 30 of even-numbered years. M.G.L. c. 112, § 81N provides that certificates of registration expire “June thirtieth in every even-numbered year,” requires the board to give notice at least one month in advance, and permits renewal on or before the expiration date or before August first following it. A registrant who does not renew within two years is “temporarily dropped from the roster,” and reinstatement requires a fee and an application showing no grounds exist for revocation under § 81P. 250 CMR 5.06 restates the even-numbered-year June 30 cycle and 250 CMR 5.06(6) provides that where a license has lapsed “the use of the Registrant’s seal is prohibited.” 250 CMR 5.07 governs reinstatement of a license lapsed more than two years. The registration number does not change. No requirement to surrender or destroy the physical device was found in 250 CMR 5.00, and 250 CMR 5.03 does not address what becomes of the seal on revocation or suspension.
Firm registration
No firm seal and no certificate-of-authorization number on the document. 250 CMR 5.05 requires that a business entity offering engineering or land surveying services have a registered engineer or land surveyor with management responsibility for that part of the business, acting as the registrant in charge. That is a management test, not a firm license printed on the drawing. Whether Massachusetts imposes any separate firm registration outside 250 CMR 5.00 was not verified; 250 CMR 5.00 as published on mass.gov does not create one, and M.G.L. c. 112, §§ 81D to 81T were reviewed only by section heading.
What to check before you order
Four text elements go on the face: Commonwealth of Massachusetts, your name, your registration number and the professional engineer legend, with your licensed branch available as an option. Confirm the exact legend against the board's authorized design, because the statute says Registered Professional Engineer and the regulation says Professional Engineer. Build to approximately one and one half inches outside diameter of the depicted image; rubber stamps, embossed seals and digitized computer generated images are all expressly permitted, so a self-inking stamp is a correct and durable choice, and durability matters here because the rule requires a seal on every filed sheet. Leave clear space beside the seal for a legible handwritten signature and a date, since your signature must be adjacent and must not obscure the seal. No provision of 250 CMR 5.00 requires anyone to verify your licensure.
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Frequently asked questions
Do I have to seal every sheet in Massachusetts?
Yes, for instruments of service filed with public authorities. 250 CMR 5.03 requires each sheet to be individually signed and sealed and appropriately dated unless otherwise authorized by statute. That is the rule that most often catches registrants out, because the seal design itself is ordinary. It is also why a well-inked rubber or self-inking stamp usually beats an embosser here, and why the digitized seal option in the same section gets used heavily.
What size is a Massachusetts PE seal?
Approximately one and one half inches outside diameter of the depicted image, under 250 CMR 5.03. The word approximately is doing real work: Massachusetts sets a target rather than a range with stated limits. Measure the image, not the die or the mount.
What has to appear on a Massachusetts PE seal?
Four elements under 250 CMR 5.03(1): Commonwealth of Massachusetts, your name as registered, your registration number, and the professional engineer legend. The registration number is required by the regulation even though the statute does not mention it. Confirm the exact legend against the board’s authorized design, because the statute says Registered Professional Engineer and the regulation says Professional Engineer.
Can I put my engineering branch on a Massachusetts seal?
Yes, and you can leave it off. 250 CMR 5.03(1)(a) provides that the seal may include the registrant’s licensed branch, so a civil, structural or mechanical designation is permitted but not required, and omitting it is not a defect.
Is a seal required in Massachusetts?
Yes. M.G.L. c. 112, § 81M requires that “Each registrant hereunder shall, upon registration, obtain a seal of the design authorized by the board, bearing the registrant’s name and the legend ‘Registered Professional Engineer’” and provides that documents be stamped with that seal when filed with public authorities while the certificate is in force. 250 CMR 5.03 supplies the design, the placement and the signature mechanics.
Rubber stamp, embosser or digitized seal in Massachusetts?
All three, and the rule says so in one sentence: “The seal must be a symbol or image in the form of a rubber stamp, embossed seal or digitized seal (computer generated image), or other form approved by the Board.” A digitized seal is legal in its own right rather than a lesser substitute. For paper filings a rubber or self-inking stamp is the durable choice, and durability matters because the seal goes on every filed sheet.
Where does the signature go relative to the Massachusetts seal?
Beside it, and not on top of it. 250 CMR 5.03(6) calls for either a “legible hand written Signature” or a “properly encrypted digital Signature” placed “adjacent to (not obscuring) the seal,” with the document “appropriately dated and signed.” The date accompanies the signature rather than being printed on the seal face, so leave clear space next to the impression.
What does Massachusetts require of a digital signature?
A functional test, with no product named. 250 CMR 5.03(11) requires “an electronic authentication process attached to it that is uniquely associated with the Registrant, can be authenticated by the recipient, and is uniquely linked to the underlying documents in a manner that will invalidate the digital Signature if any part of the document is changed.” No federal standard is incorporated by reference, so there is no FIPS citation to satisfy. 250 CMR 5.03(6) separately accepts a properly encrypted digital signature in place of a handwritten one.
Can I seal drawings someone else prepared in Massachusetts?
Only within direct charge and supervision. 250 CMR 5.03(3) allows a registrant to affix the seal “only to Instruments of Service produced by the Registrant personally or under the Registrant’s Direct Charge and Supervision,” and 250 CMR 5.03(5) adds that “Under no circumstances shall a Registrant adopt the Work Products developed by unregistered persons who themselves were not working under the Direct Charge and Supervision of a Registrant.” 250 CMR 5.04 defines what direct charge and supervision means.
Does Massachusetts require preliminary drawings to be marked?
Not addressed. 250 CMR 5.03 carries no marking requirement for preliminary, draft or not-for-construction documents, which was confirmed on two separate readings of the board’s published 250 CMR 5.00 document on mass.gov. The exemptions from the practice requirement itself sit in M.G.L. c. 112, § 81R, which was not read in full here.
When does my Massachusetts registration expire and what happens to the seal?
Certificates expire on June 30 of every even-numbered year. M.G.L. c. 112, § 81N requires the board to give notice at least one month in advance and permits renewal on or before the expiration date or before August first following it. A registrant who does not renew within two years is “temporarily dropped from the roster,” and reinstatement requires a fee and an application showing no grounds exist for revocation under § 81P. 250 CMR 5.06(6) provides that where a license has lapsed “the use of the Registrant’s seal is prohibited,” and 250 CMR 5.07 governs reinstatement after more than two years. The registration number does not change, and no requirement to surrender or destroy the device was found in 250 CMR 5.00.
Does my firm need a number on the drawing in Massachusetts?
No, and there is no firm seal. 250 CMR 5.05 requires a business entity offering engineering or land surveying services to have a registered engineer or land surveyor with management responsibility for that part of the business, acting as the registrant in charge. That is a management test rather than a firm license printed on the sheet. Whether Massachusetts imposes any separate firm registration outside 250 CMR 5.00 was not verified here; 250 CMR 5.00 as published does not create one.
