> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/companies-in/seattle-wa/architecture-and-planning/ # Architecture Firms in Seattle, WA The bigger architecture firms headquartered in Seattle, WA, with what they do, their sizes and how to reach their people. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** Among the architecture firms counted in Seattle, WA, the biggest by headcount range include Callison, Nbbj Design and Ehs Design, A Nelson. They are mostly very small: 81% have 50 or fewer employees. ## Which architecture firms are in Seattle? Among the companies whose public profile lists Architecture and Planning as their industry and Seattle, WA as their headquarters, the biggest by headcount range include Callison, Nbbj Design, Ehs Design, A Nelson, Olson Kundig and Mg2 Design. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Callison | 1,001 to 5,000 | | Nbbj Design | 501 to 1,000 | | Ehs Design, A Nelson | 501 to 1,000 | | Olson Kundig | 201 to 500 | | Mg2 Design | 201 to 500 | | Nac | 201 to 500 | | Saba Ba | 201 to 500 | | Mithun | 51 to 200 | | Lmn Architects | 51 to 200 | | The Miller Hull Partnership, LLP | 51 to 200 | | Gglo Design | 51 to 200 | | Mahlum | 51 to 200 | | Weber Thompson | 51 to 200 | | Hewitt | 51 to 200 | | Collinswoerman | 51 to 200 | | Botanical Designs | 51 to 200 | | B H Advance Strategy | 51 to 200 | | Healthy Materials Collaborative | 51 to 200 | | Sda Seattle Chapter | 51 to 200 | | Blueline | 51 to 200 | | Paladino, A Buro Happold | 11 to 50 | | Skb Architects | 11 to 50 | | Ggn | 11 to 50 | | Graham Baba Architects | 11 to 50 | | Burgess Design | 11 to 50 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## What do architecture firms in Seattle do? Architecture and Planning is a broad label. The most common NAICS codes among them are 541310 (62%), 531210 (6%) and 541410 (6%). **Figure: What architecture firms in Seattle do.** Bars for the share of counted architecture firms with each code: 541310 62%, 531210 6%, 541410 6%, 541430 6%, 541490 6%, 541611 6%, 561520 6%. *Share of counted architecture firms in Seattle by their NAICS code.* [NAICS 541310](https://enrich.chat/naics/541310/)[NAICS 531210](https://enrich.chat/naics/531210/)[NAICS 541410](https://enrich.chat/naics/541410/)[NAICS 541430](https://enrich.chat/naics/541430/)[NAICS 561520](https://enrich.chat/naics/561520/) ## How big are they? 81% of the architecture firms counted in Seattle have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of architecture firms in Seattle.** Seven columns for the share of counted architecture firms in Seattle in each employee range: 11 to 50 81%, 51 to 200 13%, 201 to 500 4%, 501 to 1,000 2%, 1,001 to 5,000 1%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted architecture firms in Seattle in each employee range.* ## How old are they? Most were founded in the 1970s (23%), then the 1990s (21%). **Figure: When architecture firms in Seattle were founded.** Eight columns for the share of counted architecture firms in Seattle founded in each era: Before 1960 7%, 1960s 7%, 1970s 23%, 1980s 8%, 1990s 21%, 2000s 15%, 2010s 18%, 2020s 0%. *Share of counted architecture firms in Seattle by the era they were founded in, for the ones that list a founding year.* ## How architecture firms compare - 81% of architecture firms in Seattle have 50 or fewer employees, against 71% across other cities on this site. - 18% were founded in 2010 or later, against 54% across other cities on this site. ## How do you reach the people at architecture firms in Seattle? The people to talk to are usually principals and operations leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the architecture firms in Seattle, WA ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the principals and operations leaders at architecture firms in Seattle, WA, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Other industries in Seattle: [Software Companies](https://enrich.chat/companies-in/seattle-wa/software-development/)[Construction Companies](https://enrich.chat/companies-in/seattle-wa/construction/)[Real Estate Companies](https://enrich.chat/companies-in/seattle-wa/real-estate/)[IT Services Companies](https://enrich.chat/companies-in/seattle-wa/it-services-and-it-consulting/)[Nonprofit Organizations](https://enrich.chat/companies-in/seattle-wa/non-profit-organizations/)[Advertising Agencies](https://enrich.chat/companies-in/seattle-wa/advertising-services/)[Technology and Internet Companies](https://enrich.chat/companies-in/seattle-wa/technology-information-and-internet/)[Consulting Firms](https://enrich.chat/companies-in/seattle-wa/business-consulting-and-services/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/seattle-wa/hospitals-and-health-care/)[Financial Services Companies](https://enrich.chat/companies-in/seattle-wa/financial-services/)[Law Firms](https://enrich.chat/companies-in/seattle-wa/law-practice/)[Legal Services Firms](https://enrich.chat/companies-in/seattle-wa/legal-services/)[Design Firms](https://enrich.chat/companies-in/seattle-wa/design-services/)[Education Organizations](https://enrich.chat/companies-in/seattle-wa/education-administration-programs/)[Food and Beverage Manufacturers](https://enrich.chat/companies-in/seattle-wa/food-and-beverage-manufacturing/)[Facilities Services Companies](https://enrich.chat/companies-in/seattle-wa/facilities-services/)[Colleges and Universities](https://enrich.chat/companies-in/seattle-wa/higher-education/)[Research Services Firms](https://enrich.chat/companies-in/seattle-wa/research-services/)[All of Seattle](https://enrich.chat/companies-in/seattle-wa/) Architecture Firms in other cities: [New York, NY](https://enrich.chat/companies-in/new-york-ny/architecture-and-planning/)[Los Angeles, CA](https://enrich.chat/companies-in/los-angeles-ca/architecture-and-planning/)[San Francisco, CA](https://enrich.chat/companies-in/san-francisco-ca/architecture-and-planning/)[Chicago, IL](https://enrich.chat/companies-in/chicago-il/architecture-and-planning/)[Denver, CO](https://enrich.chat/companies-in/denver-co/architecture-and-planning/)[Boston, MA](https://enrich.chat/companies-in/boston-ma/architecture-and-planning/)[San Diego, CA](https://enrich.chat/companies-in/san-diego-ca/architecture-and-planning/)[Dallas, TX](https://enrich.chat/companies-in/dallas-tx/architecture-and-planning/)[Philadelphia, PA](https://enrich.chat/companies-in/philadelphia-pa/architecture-and-planning/)[Portland, OR](https://enrich.chat/companies-in/portland-or/architecture-and-planning/) ## Frequently asked questions ### Which are the biggest architecture firms in Seattle? Among those counted, they include Callison, Nbbj Design, Ehs Design, A Nelson, Olson Kundig and Mg2 Design, ranked by headcount range. ### How big are architecture firms in Seattle? 81% of those counted have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. ### Which companies count as architecture and planning? Companies whose public profile lists Architecture and Planning as their industry and whose headquarters are in Seattle, WA. ## Try this prompt Find the people at architecture firms in Seattle ```text Use www.enrich.chat to find the principals and operations leaders at architecture firms in Seattle, WA, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Software Companies in Seattle](https://enrich.chat/companies-in/seattle-wa/software-development/) - [Construction Companies in Seattle](https://enrich.chat/companies-in/seattle-wa/construction/) - [Real Estate Companies in Seattle](https://enrich.chat/companies-in/seattle-wa/real-estate/) - [IT Services Companies in Seattle](https://enrich.chat/companies-in/seattle-wa/it-services-and-it-consulting/) - [Architecture Firms in New York](https://enrich.chat/companies-in/new-york-ny/architecture-and-planning/) - [Architecture Firms in Los Angeles](https://enrich.chat/companies-in/los-angeles-ca/architecture-and-planning/) - [Architecture Firms in San Francisco](https://enrich.chat/companies-in/san-francisco-ca/architecture-and-planning/) - [Architecture Firms in Chicago](https://enrich.chat/companies-in/chicago-il/architecture-and-planning/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)