Architecture firms in Seattle: 525 offices, Washington's firm license and what design fees look like

This guide is for owners, developers, agencies and homeowners hiring an architect in the Seattle area, for architects and designers looking at local employers, and for sellers whose customers are architecture firms. It covers the Census count, Washington's rules on who must use an architect, what the state publishes about fees, and how to prospect the market.

Seattle's architecture offices at a glance

County Business Patterns (CBP) 2023 counts establishments in NAICS 541310, Architectural Services, in the Seattle-Tacoma-Bellevue, WA Metro Area (CBSA 42660): King, Pierce and Snohomish counties.

By size, 312 offices have one to four employees, 95 have five to nine, 67 have 10 to 19, 32 have 20 to 49, nine have 50 to 99 and eight have 100 to 249. The remaining two have 250 or more; the Census Bureau doesn't publish the classes above 250 here, so that figure is the total less the published classes.

CBP counts offices with paid staff, not companies: a firm with studios in Seattle and Tacoma counts twice, and sole practitioners without employees aren't in it.

King County is the market

Averages are our calculation from each county's published figures. King County holds all eight of the metro's offices with 100 to 249 employees and, by the same subtraction, both of the larger ones. Around the architects, the metro has 950 engineering offices, 388 commercial and institutional builders (including design-build firms), 290 interior design offices and 71 landscape architecture offices in the same CBP release. The Census Bureau classifies a firm that designs and builds under construction, not architecture.

Do you need a licensed architect in Washington?

RCW 18.08.410 lists the work the architects' law doesn't stop others from doing. In summary:

Much house and small-building design can legally be done by unlicensed designers, so ask anyone offering design what they're licensed to stamp. Above these limits, the permit set needs a licensed architect, or an engineer for work the law treats as engineering.

Check the firm as well as the architect

Washington licenses the business, not just the person. Under RCW 18.08.420, any business entity offering architecture in the state, "including a sole proprietorship," must register and obtain a certificate of authorization. The architect in charge must be a general partner, manager or director, registered in Washington, with "full authority to make all final architectural decisions." Check both in the Department of Licensing's license lookup.

What Washington publishes about architect fees

The Office of Financial Management's A/E fee guidelines, effective 1 July 2025, set the maximum basic-services fee state agencies budget for public building projects over $1 million, as a percentage of the maximum allowable construction cost. Schedule A covers complex buildings such as hospitals and labs, B covers offices, schools, libraries and apartments, and C simple buildings such as warehouses and parking garages.

Illustrative example, using the state's published rates. A $10 million office building on Schedule B gives a ceiling of $852,000 for basic services. The guide's phase split puts 18% ($153,360) in schematic design, 20% ($170,400) in design development, 31% ($264,120) in construction documents, 2% ($17,040) in bidding, 27% ($230,040) in construction and 2% ($17,040) in closeout. Hourly work is capped at $250 for staff and $350 for principals, at two to 3.2 times direct salary.

These are public-sector maximums, and the final negotiated fee can sit above or below them. A private client can still use them to test a proposal: if a fee is far above the table, ask what extra services it includes. State and local agencies choose the firm first on qualifications under RCW 39.80 and only then negotiate the fee.

Hiring well

1. Write the project down: use, size, budget, site and the approvals you expect.
2. Shortlist from comparable work, using AIA Seattle's Find an Architect directory and buildings you've visited.
3. Verify the firm's certificate of authorization and the stamping architect's license.
4. Interview three and ask who runs the job, how construction observation works, and what's excluded.
5. Use a standard agreement: AIA's B101-2017 for most buildings, or B109-2020, written for multifamily and mixed-use residential projects.

AIA Seattle and jobs

AIA Seattle runs the Center for Architecture and Design, a Small Practice and Residential Committee and a job board. Pay from the Bureau of Labor Statistics for the metro, May 2025:

Architects and landscape architects are both more than twice as concentrated in Seattle's workforce as nationally. SEC records show no listed architecture company based in the metro.

Selling to Seattle architecture firms

The 474 offices with fewer than 20 employees are owner-led: the principal decides, often in one conversation. The 41 with 20 to 99 have studio leaders and an operations or IT manager who evaluate, with partners signing. The 10 largest, all in King County, buy through procurement and want references from comparable firms.

Illustrative example. The company, prices and results are invented.

Rainline Envelope (rainline.example) consults on building envelopes for multifamily projects too large for Washington's exemptions, which need an architect. It targets King County offices with 10 to 49 employees, 87 by the Census count, and keeps the 40 or so whose websites show apartments or mixed use. Three touches to each studio lead earn eight replies and three consulting engagements at $15,000. The filter is what matters, and Bebop researches each firm's project mix so the list starts with the right 40.

Hi [first name], I saw [firm]'s [project name] in [neighborhood]. We review envelope details on multifamily jobs at design development, before the permit set goes in. Happy to share the checklist we use on [wood-frame or mass timber] buildings if useful.

Next step: see who builds what these firms design in construction companies in Seattle.