Engineering Firms across King County.
Verified engineering firms practicing across the King County metro, Washington, with project history and live Washington board records for the engineers on staff.
King County engineering firms.
King County covers Seattle, Bellevue, Redmond, and Kirkland. Software, aerospace, civil, and high-rise structural engineering lead the region's licensing rosters.
EngineerMint aggregates live Washington board records alongside claimable, verified profiles so you can locate qualified engineers across King County and confirm credentials without leaving the page.
Browse by discipline below, post a project brief to the marketplace, or run the AI Estimator for an order-of-magnitude cost and schedule.
Licensed engineers in King County
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King County engineers by specialty
Hiring an engineer in King County
What credentials do King County engineering firms need?+
Firms practicing in King County typically hold a Washington Certificate of Authorization (COA) plus individual P.E. licenses for each engineer of record on staff. EngineerMint profiles consolidate both.
How do I shortlist engineering firms in King County?+
Filter the directory by discipline and project type, then compare verified firm profiles by license count, project history, and active marketplace responses.
Can I send an RFP to multiple King County firms at once?+
Yes. Post a single project brief and matched firms across the King County metro will submit proposals within 48 hours for well-scoped work.
Are out-of-state firms allowed to work in King County?+
Yes, provided they hold an active Washington COA and have a licensed engineer of record on the project. Many national firms maintain Washington authority for this reason.
When you need a licensed Professional Engineer for King County engineering work
Permits, stamped drawings, and code compliance turn on whether a Professional Engineer (P.E.) is on the deliverable. These are the situations where a licensed P.E. is non-negotiable.
Permitted construction & PE-stamped drawings
Any drawing submitted to a building department, AHJ, or utility for permit typically requires a Professional Engineer's stamp in the state the project will be built.
Public safety & code compliance
Life-safety, structural, electrical, and pressure-system work falls under state engineering practice acts. Unstamped work in these scopes is generally illegal and uninsurable.
Owner, lender, and insurer requirements
Owners, AHJs, lenders, and insurers commonly require P.E.-sealed deliverables before they will fund, approve, or insure a project — even on scopes that might otherwise be exempt.
Liability & professional responsibility
A P.E. seal documents professional responsibility for the design. Using a licensed engineer is the standard risk-transfer mechanism owners and contractors rely on.
Find, compare, and engage the right engineers — faster.
Directory & license lookup
Search a nationwide directory of licensed engineers and firms sourced from official state board rosters — every record verifiable on the issuing board.
AI matching
Describe your scope and let AI shortlist licensed engineers and firms by discipline, jurisdiction, and project type.
Firm comparison
Compare firms side by side on Certificate of Authorization, in-house P.E. roster, signature projects, and credentials before issuing an RFP.
Project posting
Post a brief to the marketplace and receive proposals from licensed engineers and firms within 1–2 business days.
Post a Project →
Describe your scope and receive proposals from licensed engineers within 1–2 business days.
Find Engineers →
Search verified Professional Engineers sourced from official US state licensing boards.
Browse Firms →
Browse engineering firms by discipline, state, and project type — all with verified COA.