> 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/st-louis-mo/architecture-and-planning/ # Architecture Firms in St. Louis, MO The bigger architecture firms headquartered in St. Louis, MO, 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 St. Louis, MO, the biggest by headcount range include Atis, Lawrence Group and Kai Enterprises. They are mostly very small: 72% have 50 or fewer employees. ## Which architecture firms are in St. Louis? Among the companies whose public profile lists Architecture and Planning as their industry and St. Louis, MO as their headquarters, the biggest by headcount range include Atis, Lawrence Group, Kai Enterprises, Pgav Destinations and Arcturis. Names link to a company profile where we have one. | Company | Employees | | --- | --- | | Atis | 201 to 500 | | Lawrence Group | 51 to 200 | | Kai Enterprises | 51 to 200 | | Pgav Destinations | 51 to 200 | | Arcturis | 51 to 200 | | Gray Design Group | 51 to 200 | | Christner Architects | 51 to 200 | | Hastings Chivetta Architects, A Ghc Studio | 51 to 200 | | Pgav Planners | 51 to 200 | | Casco Architecture & Engineering | 51 to 200 | | Arcvision Incorporated | 51 to 200 | | Kwk Architects, A Lawrence Group | 51 to 200 | | Iida Gateway Chapter | 51 to 200 | | Csi Greater Saint Louis Chapter | 51 to 200 | | Arizon Building Systems | 51 to 200 | | Jema | 11 to 50 | | Mackey Mitchell Architects | 11 to 50 | | Trivers | 11 to 50 | | Oculus | 11 to 50 | | Remiger Design | 11 to 50 | | Space Architects Designers Builders | 11 to 50 | | Hera Laboratory Planners | 11 to 50 | | Kirkegaard | 11 to 50 | | Swt Design | 11 to 50 | | Bond Architects | 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 St. Louis do? Architecture and Planning is a broad label. The most common NAICS codes among them are 541310 (44%), 541410 (33%) and 541320 (11%). **Figure: What architecture firms in St. Louis do.** Bars for the share of counted architecture firms with each code: 541310 44%, 541410 33%, 541320 11%, 541330 11%. *Share of counted architecture firms in St. Louis by their NAICS code.* [NAICS 541310](https://enrich.chat/naics/541310/)[NAICS 541410](https://enrich.chat/naics/541410/)[NAICS 541320](https://enrich.chat/naics/541320/) ## How big are they? 72% of the architecture firms counted in St. Louis 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 St. Louis.** Seven columns for the share of counted architecture firms in St. Louis in each employee range: 11 to 50 72%, 51 to 200 26%, 201 to 500 2%, 501 to 1,000 0%, 1,001 to 5,000 0%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted architecture firms in St. Louis in each employee range.* ## How do you reach the people at architecture firms in St. Louis? 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 St. Louis, MO ``` ### 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 St. Louis, MO, 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 St. Louis: [Construction Companies](https://enrich.chat/companies-in/st-louis-mo/construction/)[Hospitals and Health Care Organizations](https://enrich.chat/companies-in/st-louis-mo/hospitals-and-health-care/)[Advertising Agencies](https://enrich.chat/companies-in/st-louis-mo/advertising-services/)[Real Estate Companies](https://enrich.chat/companies-in/st-louis-mo/real-estate/)[IT Services Companies](https://enrich.chat/companies-in/st-louis-mo/it-services-and-it-consulting/)[Software Companies](https://enrich.chat/companies-in/st-louis-mo/software-development/)[Nonprofit Organizations](https://enrich.chat/companies-in/st-louis-mo/non-profit-organizations/)[Financial Services Companies](https://enrich.chat/companies-in/st-louis-mo/financial-services/)[Insurance Companies](https://enrich.chat/companies-in/st-louis-mo/insurance/)[Manufacturers](https://enrich.chat/companies-in/st-louis-mo/manufacturing/)[Consulting Firms](https://enrich.chat/companies-in/st-louis-mo/business-consulting-and-services/)[Machinery Manufacturers](https://enrich.chat/companies-in/st-louis-mo/machinery-manufacturing/)[Wholesale Distributors](https://enrich.chat/companies-in/st-louis-mo/wholesale/)[Facilities Services Companies](https://enrich.chat/companies-in/st-louis-mo/facilities-services/)[All of St. Louis](https://enrich.chat/companies-in/st-louis-mo/) 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/)[Seattle, WA](https://enrich.chat/companies-in/seattle-wa/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/) ## Frequently asked questions ### Which are the biggest architecture firms in St. Louis? Among those counted, they include Atis, Lawrence Group, Kai Enterprises, Pgav Destinations and Arcturis, ranked by headcount range. ### How big are architecture firms in St. Louis? 72% 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 St. Louis, MO. ## Try this prompt Find the people at architecture firms in St. Louis ```text Use www.enrich.chat to find the principals and operations leaders at architecture firms in St. Louis, MO, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [Construction Companies in St. Louis](https://enrich.chat/companies-in/st-louis-mo/construction/) - [Hospitals and Health Care Organizations in St. Louis](https://enrich.chat/companies-in/st-louis-mo/hospitals-and-health-care/) - [Advertising Agencies in St. Louis](https://enrich.chat/companies-in/st-louis-mo/advertising-services/) - [Real Estate Companies in St. Louis](https://enrich.chat/companies-in/st-louis-mo/real-estate/) - [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/)