Licensed Engineering Firms in the United States
Find and verify engineering firms holding active Certificates of Authorization in every U.S. state — with licensed P.E. engineers of record on staff.
Firm licensure matters as much as individual P.E. licensure.
In nearly every state, an engineering firm must hold a Certificate of Authorization (COA) before it can legally offer services. A firm that employs licensed engineers is not the same thing as a licensed firm — and an AHJ will reject a submittal stamped by a firm without a valid COA in that jurisdiction.
EngineerMint surfaces firms by COA status, state coverage, in-house P.E. roster, and discipline. Before you issue an RFP, confirm the firm holds an active COA in the state where your project will be built — not just where it has an office.
If the firm cannot produce a current COA number on request, treat it as a disqualifier.
Real licensed engineers, sourced from official boards
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Frequently asked questions
What is a licensed engineering firm?+
A licensed engineering firm is a business entity authorized by a state board to offer engineering services to the public. In most states, the firm itself must hold a Certificate of Authorization (COA) separate from the individual P.E. licenses of its engineers. Without firm licensure, a company cannot legally provide engineering services in that state — even if it employs licensed engineers.
How do I verify an engineering firm's license?+
Look up the firm on its state board's public roster (NCEES Records, the state PE board database, or the state's Department of Professional Regulation). Verify three things: the firm's Certificate of Authorization is active, the engineer of record (EOR) is individually licensed in that state, and there are no open disciplinary actions. Ask the firm for its COA number — a legitimate firm provides it without hesitation.
When does my project require PE-stamped drawings?+
Most jurisdictions require P.E. stamps for: structural designs for habitable buildings, electrical service over a certain ampacity, mechanical systems regulated by code, public works (water, wastewater, transportation), and any submittal to an authority having jurisdiction (AHJ). Single-family residential work has exemptions in some states. When in doubt, ask the AHJ before scoping the engagement.
Can a firm work in states where it isn't licensed?+
No. Engineering firms must hold a COA in every state where they offer or perform services. Some firms partner with a locally-licensed firm or hire an in-state P.E. as engineer of record. Reciprocity exists for individual P.E.s through NCEES Records, but firm licensure is state-by-state — there is no national firm license.
What's the difference between a licensed firm and a licensed engineer?+
An individual P.E. is licensed to practice; a firm is licensed to offer services and bill clients. A firm with no P.E. on staff cannot hold a COA. Conversely, a P.E. moonlighting under their own name in a state that requires firm licensure is operating outside the law. Both licenses matter — verify both.