# List of Architecture and Planning companies in California

Tamtam tracks 58 Architecture and Planning companies headquartered in California. This list ranks the 50 largest by number of employees on LinkedIn, led by Gensler, MIG and JERDE. Their median headcount is 167. Half of them were founded in 1986 or later. The most common headquarters are San Francisco (11), Los Angeles (9) and Irvine (3).

This selection of large companies in California's Architecture and Planning sector includes well-established firms. Gensler, with over 8,000 employees, is a global architecture, design, and planning firm. MIG specializes in planning, design, and sustainability, while JERDE focuses on urban planning and architecture. LPA, Inc. designs sustainable projects, and WATG and Wimberly Interiors provide luxury hospitality design services. SWA specializes in landscape architecture and urban design.

The companies listed are primarily large, established firms, with several founded in the mid-20th century. A notable pattern is the concentration of headquarters in Southern California, particularly in the Los Angeles and Orange County areas, alongside a significant presence in the San Francisco Bay Area.

🇺🇸 California · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Gensler](https://www.tamtam.ai/c/gensler) (gensler.com)<br>Global architecture, design, and planning firm with a network of 6,000+ professionals creating positive change through impactful design across various sectors worldwide | Architecture and Planning | 🇺🇸 San Francisco | 8,363 | 1965 |
| 2 | [MIG](https://www.tamtam.ai/c/mig-berkeley) (migcom.com)<br>An organization specializing in planning, design, and sustainability of environments for human development, emphasizing inclusivity, community engagement, and strategic approaches | Architecture and Planning | 🇺🇸 Berkeley | 963 | 1982 |
| 3 | [JERDE](https://www.tamtam.ai/c/jerde) (jerde.com)<br>This global design group specializes in innovative urban planning, architecture, and landscaping to create unique, experiential places around the world | Architecture and Planning | 🇺🇸 Los Angeles | 795 | 1977 |
| 4 | [LPA, Inc.](https://www.tamtam.ai/c/lpa-inc) (lpadesignstudios.com)<br>LPA is a design firm focused on creating timeless, sustainable projects that benefit the environment, enrich human experiences, and inspire innovation | Architecture and Planning | 🇺🇸 Irvine | 731 | 1965 |
| 5 | [WATG and Wimberly Interiors](https://www.tamtam.ai/c/watg-and-wimberly-interiors) (watg.com)<br>A top provider of integrated luxury hospitality design services, offering advisory, master planning, architecture, landscape design, and Wimberly Interiors | Architecture and Planning | 🇺🇸 Tustin | 656 | 1945 |
| 6 | [SWA](https://www.tamtam.ai/c/swa) (swagroup.com)<br>Collective of eight independent studios specializing in landscape architecture, urban design, and planning with employee ownership structure. | Architecture and Planning | 🇺🇸 Sausalito | 603 |  |
| 7 | [HMC Architects](https://www.tamtam.ai/c/hmc-architects) (hmcarchitects.com)<br>Employee-owned design firm established in 1940, focusing on creating impactful healthcare, education, and civic spaces in California through innovative designs | Architecture and Planning | 🇺🇸 Los Angeles | 587 | 1940 |
| 8 | [AAI](https://www.tamtam.ai/c/aai) (nelsonworldwide.com)<br>A full-service architecture, design, engineering, and consulting firm with a focus on corporate interior design and serving Bay Area technology clients | Architecture and Planning | 🇺🇸 San Jose | 550 | 1979 |
| 9 | [KTGY](https://www.tamtam.ai/c/ktgy) (ktgy.com)<br>Award-winning design firm specializing in architecture, branding, interiors, and planning, dedicated to innovation, creativity, and making a positive impact on communities | Architecture and Planning | 🇺🇸 Irvine | 528 |  |
| 10 | [AO](https://www.tamtam.ai/c/ao) (aoarchitects.com)<br>Architectural firm established in 1974 specializing in Retail, Residential, and Mixed-Use projects with 50 years of experience and industry leadership | Architecture and Planning | 🇺🇸 Orange | 452 | 1974 |
| 11 | [LASD Studio](https://www.tamtam.ai/c/lasd-studio) (lasdstudio.com)<br>Global provider of landscape design, exterior design, landscape architecture, and urban design services in San Diego, New York, and Madrid | Architecture and Planning | 🇺🇸 La Jolla | 438 | 2008 |
| 12 | [MAD](https://www.tamtam.ai/c/mad-santa-monica) (i-mad.com)<br>MAD creates futuristic architecture inspired by the eastern spirit of nature, focusing on community, freedom, and personalized experiences in various projects | Architecture and Planning | 🇺🇸 Santa Monica | 433 | 2004 |
| 13 | [Archinect](https://www.tamtam.ai/c/archinect) (archinect.com)<br>Established in 1997, this online architecture community and content source provides job listings, news, events, discussions, and profiles for architects and students | Architecture and Planning | 🇺🇸 Los Angeles | 418 | 1997 |
| 14 | [STUDIOS Architecture](https://www.tamtam.ai/c/studios-architecture) (studios.com)<br>An international design practice with studios in multiple cities, specializing in creating built environments that reflect clients' organizations with collaboration and expertise | Architecture and Planning | 🇺🇸 San Francisco | 417 | 1985 |
| 15 | [RIOS](https://www.tamtam.ai/c/rios) (rios.com)<br>International design collective blending disciplines like architecture, landscape, and interior design to create authentic and unexpected solutions for diverse projects worldwide | Architecture and Planning | 🇺🇸 Los Angeles | 323 | 1985 |
| 16 | [ALR](https://www.tamtam.ai/c/alr) (alrinc.com)<br>Northern California agency representing lighting and controls manufacturers with a focus on exceptional customer service and integrity Serving regions in California, Nevada, Oregon, and Washington | Architecture and Planning | 🇺🇸 Oakland | 317 |  |
| 17 | [MBH Architects](https://www.tamtam.ai/c/mbh-architects) (mbharch.com)<br>Full-service architectural firm with LEED Gold headquarters in San Francisco, specializing in creative design, technical execution, and sustainable, socially responsible projects globally | Architecture and Planning | 🇺🇸 Alameda | 313 | 1989 |
| 18 | [RDC.](https://www.tamtam.ai/c/rdc) (rdcollaborative.com)<br>A collaborative approach to creating enduring architecture, planning, interiors, and branding that enhance communities and brands through storytelling and strategic procurement | Architecture and Planning | 🇺🇸 Long Beach | 307 | 1979 |
| 19 | [DAHLIN Architecture \| Planning \| Interiors](https://www.tamtam.ai/c/dahlin-architecture-planning-interiors) (dahlingroup.com)<br>A diverse firm of multicultural professionals in architecture, planning, and interiors, collaborating to craft sustainable communities and urban environments | Architecture and Planning | 🇺🇸 Pleasanton | 236 | 1976 |
| 20 | [RRM Design Group](https://www.tamtam.ai/c/rrm-design-group) (rrmdesign.com)<br>A multidisciplinary firm dedicated to creating sustainable and innovative environments throughout the west coast, known for its award-winning designs and collaborative culture | Architecture and Planning | 🇺🇸 San Luis Obipso | 231 | 1974 |
| 21 | [DGA](https://www.tamtam.ai/c/dga-mountain-view) (dgaonline.com)<br>A planning, architecture, and interior design firm focused on creating environments that promote physical, mental, and social well-being for society | Architecture and Planning | 🇺🇸 Mountain View | 202 | 1995 |
| 22 | [ArchiCGI](https://www.tamtam.ai/c/archicgi) (archicgi.com)<br>Professional 3D rendering services specializing in architectural visualization, interior/exterior design, product visualization, and furniture rendering Online client support available 24/7 | Architecture and Planning | 🇺🇸 San Francisco | 170 | 2011 |
| 23 | [CO Architects](https://www.tamtam.ai/c/co-architects) (coarchitects.com)<br>This Los Angeles-based architectural firm specializes in designing innovative projects for higher education, science & technology, civic, and healthcare sectors nationwide | Architecture and Planning | 🇺🇸 Los Angeles | 168 | 1986 |
| 24 | [CONG TY XAY DUNG TV-TK-XD PHAT THANH](https://www.tamtam.ai/c/cong-ty-xay-dung-tv-tk-xd-phat-thanh) (xaydungphatthanh.com)<br>A reputable contractor specializing in designing and constructing residential buildings, townhouses, and villas in the city | Architecture and Planning | 🇺🇸 Mountain View | 168 | 2017 |
| 25 | [slantis](https://www.tamtam.ai/c/slantis) (slantis.com)<br>The company partners with AEC organizations to enhance built projects using innovative BIM technology, providing streamlined solutions for architecture projects | Architecture and Planning | 🇺🇸 San Francisco | 167 | 2015 |
| 26 | [Nelson\Nygaard Consulting Associates](https://www.tamtam.ai/c/nelson-nygaard-consulting-associates) (nelsonnygaard.com)<br>Development of practical, sustainable transportation systems focused on mobility, equity, economic growth, and healthy, accessible communities nationwide. | Architecture and Planning | 🇺🇸 San Francisco | 164 | 1987 |
| 27 | [Taylor Design](https://www.tamtam.ai/c/taylor-design) (wearetaylor.com)<br>A design firm specializing in architectural design, interior design, planning, and design strategy, with a focus on healthcare, science & technology, education, and senior living | Architecture and Planning | 🇺🇸 Tustin | 163 | 1979 |
| 28 | [Ozel Office](https://www.tamtam.ai/c/ozel-office) (ozeloffice.com)<br>Interdisciplinary design firm merging architecture, visual arts, and urban research to create innovative and sustainable solutions at the intersection of creativity and technology | Architecture and Planning | 🇺🇸 Calabasas | 158 |  |
| 29 | [TETER Architects and Engineers](https://www.tamtam.ai/c/teter-architects-and-engineers) (teterae.com)<br>Architects and engineers in Central Valley with deep community roots, focused on collaborative, value-driven design solutions for long-lasting client relationships | Architecture and Planning | 🇺🇸 Fresno | 151 | 1979 |
| 30 | [Marmol Radziner](https://www.tamtam.ai/c/marmol-radziner) (marmol-radziner.com)<br>An award-winning design-build architecture and construction firm in Los Angeles, integrating architectural design with construction services for prestigious projects | Architecture and Planning | 🇺🇸 Los Angeles | 150 | 1989 |
| 31 | [BAR Architects & Interiors](https://www.tamtam.ai/c/bar-architects-and-interiors) (bararch.com)<br>An architectural firm with a focus on sustainable design, diversity, and community involvement, creating engaging environments that enrich lives and exceed client expectations | Architecture and Planning | 🇺🇸 San Francisco | 148 | 1966 |
| 32 | [WRNS Studio](https://www.tamtam.ai/c/wrns-studio) (wrnsstudio.com)<br>Architectural firm specializing in sustainable, site-specific design for organizations, offering architecture, planning, and interior design services in various locations | Architecture and Planning | 🇺🇸 San Francisco | 147 | 2005 |
| 33 | [Studio-MLA](https://www.tamtam.ai/c/studio-mla) (studio-mla.com)<br>A design studio specializing in landscape architecture, urban design, and planning, with a focus on fostering human connection, community unity, and environmental restoration | Architecture and Planning | 🇺🇸 Los Angeles | 72 | 1995 |
| 34 | [LEDDY MAYTUM STACY Architects](https://www.tamtam.ai/c/leddy-maytum-stacy-architects) (lmsarch.com)<br>Award-winning architecture firm in San Francisco specializing in sustainable design for affordable housing, education, adaptive re-use, historic rehabilitation, and more | Architecture and Planning | 🇺🇸 San Francisco | 30 | 1982 |
| 35 | [Flewelling & Moody](https://www.tamtam.ai/c/flewelling-and-moody) (flewelling-moody.com)<br>Design and planning firm since 1928, specializing in creative solutions that meet client needs, enhance functionality, and respect budgets | Architecture and Planning | 🇺🇸 Pasadena | 27 | 1928 |
| 36 | [BROOKS SCARPA HUBER](https://www.tamtam.ai/c/brooks-scarpa-huber) (brooksscarpahuber.com)<br>A collective of architects and designers creating innovative, sustainable, and iconic buildings and urban environments, blending art, craft, and holistic approaches | Architecture and Planning | 🇺🇸 Hawthorne | 23 | 1991 |
| 37 | [domusstudio architecture](https://www.tamtam.ai/c/domusstudio-architecture) (domusstudio.com)<br>An award-winning architectural design studio specialized in creating sustainable, enriching, and collaborative spaces for residential, educational, public, and sacred purposes | Architecture and Planning | 🇺🇸 San Diego | 22 | 1986 |
| 38 | [Marcatects](https://www.tamtam.ai/c/marcatects) (marcatects.com)<br>Architectural firm in San Diego area specializing in holistic approach to successful projects, utilizing BIM technology and focusing on sustainability | Architecture and Planning | 🇺🇸 Escondido | 22 | 1974 |
| 39 | [Andrew Goodwin Designs](https://www.tamtam.ai/c/andrew-goodwin-designs) (andrewgoodwin.us)<br>An architecture and design practice in California with a focus on sustainability and social impact, offering services for various project types | Architecture and Planning | 🇺🇸 San Luis Obispo | 17 | 2015 |
| 40 | [GoPillar Academy](https://www.tamtam.ai/c/gopillar-academy) (gopillaracademy.com)<br>An e-learning platform offering high-level courses for architects and designers on planning software, methodology, 3D modeling, rendering, civil engineering, and more | Architecture and Planning | 🇺🇸 San Francisco | 13 | 2018 |
| 41 | [City Design Studio](https://www.tamtam.ai/c/city-design-studio) (citydesign-studio.com)<br>Urban design, architecture, and planning firm dedicated to revitalizing communities and creating vibrant, extraordinary environments through strategic development and consensus building | Architecture and Planning | 🇺🇸 Los Angeles | 13 | 1910 |
| 42 | [The New Farm, Contemporary Rural Architecture](https://www.tamtam.ai/c/the-new-farm-contemporary-rural-architecture) (houseplans.com)<br>HousePlans offers high-quality architectural resources and guidance for building, remodeling, or renovating homes affordably and efficiently with thousands of design plans available | Architecture and Planning | 🇺🇸 Novato | 12 | 2003 |
| 43 | [Hollander Design Group](https://www.tamtam.ai/c/hollander-design-group) (hollanderdg.com)<br>A creative professional services company specializing in strategic planning, architecture, interior design, graphic design, and product design with a dedicated team approach | Architecture and Planning | 🇺🇸 San Diego | 12 | 2009 |
| 44 | [Community Design + Architecture](https://www.tamtam.ai/c/community-design-architecture) (community-design.com)<br>Planning, urban design, and architecture firm focused on integrated transportation/land use planning, mixed-use community design, and sustainable development for public/private sectors | Architecture and Planning | 🇺🇸 Oakland | 10 | 1997 |
| 45 | [Kevin Stephens Design Group](https://www.tamtam.ai/c/kevin-stephens-design-group) (kevinstephensdesign.com)<br>A San Francisco-based sustainable design and construction management firm specializing in building eco-friendly properties within any budget | Architecture and Planning | 🇺🇸 San Francisco | 9 | 2003 |
| 46 | [NEW THEME](https://www.tamtam.ai/c/new-theme) (newtheme.net)<br>An integrated design-build firm specializing in sustainable architecture that creates unique, custom projects for diverse clientele using innovative forms | Architecture and Planning | 🇺🇸 Los Angeles | 8 | 2005 |
| 47 | [MacCracken Robinson Architects](https://www.tamtam.ai/c/maccracken-robinson-architects) (macarchs.com)<br>An architectural firm specializing in creating unique, sustainable spaces that blend client goals with regulatory requirements and natural materials | Architecture and Planning | 🇺🇸 San Francisco | 8 | 1985 |
| 48 | [William Maston Architect & Associates](https://www.tamtam.ai/c/william-maston-architect-and-associates) (mastonarchitect.com)<br>This full-service home design and remodeling architecture firm specializes in incorporating sustainable practices into new construction, additions, remodels, and hillside homes | Architecture and Planning | 🇺🇸 Mountain View | 8 |  |
| 49 | [FutureSpace Corp](https://www.tamtam.ai/c/futurespace-corp) (environmentsbyrex.earth)<br>Innovative real estate and architecture company creating dynamic, transformative living spaces with a focus on sustainability, health, and human connection | Architecture and Planning | 🇺🇸 Morongo Valley | 7 | 1990 |
| 50 | [DKY Architects](https://www.tamtam.ai/c/dky-architects) (tds-ae.com)<br>The company focuses on designing creative, innovative buildings with sustainable features using the latest technology, materials, and systems, aiming for unique solutions | Architecture and Planning | 🇺🇸 Irvine | 7 | 2004 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in California

- [The largest companies in California](https://www.tamtam.ai/l/largest-companies-california) (15,264)
- [Multinational companies in California](https://www.tamtam.ai/l/multinational-companies-california) (2,591)
- [SaaS companies in California](https://www.tamtam.ai/l/saas-companies-california) (1,854)
- [Software Development companies in California](https://www.tamtam.ai/l/software-development-companies-california) (1,649)
- [AI companies in California](https://www.tamtam.ai/l/ai-companies-california) (1,296)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,275)
- [Manufacturers in California](https://www.tamtam.ai/l/manufacturers-california) (1,066)
- [Hardware manufacturers in California](https://www.tamtam.ai/l/hardware-companies-california) (985)
- [IT Services and IT Consulting companies in California](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-california) (968)
- [Education providers in California](https://www.tamtam.ai/l/education-companies-california-united-states) (950)
- [Subscription businesses in California](https://www.tamtam.ai/l/subscription-businesses-california) (939)
- [Venture capital and private equity firms in California](https://www.tamtam.ai/l/vc-and-private-equity-firms-california) (917)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Companies with a mobile app in California](https://www.tamtam.ai/l/companies-with-mobile-app-california) (827)
- [Retail chains in California](https://www.tamtam.ai/l/retail-chains-california) (803)
- [IT services companies in California](https://www.tamtam.ai/l/it-services-companies-california) (796)
- [Venture Capital and Private Equity Principals companies in California](https://www.tamtam.ai/l/venture-capital-and-private-equity-principals-companies-california) (731)
- [Financial services firms in California](https://www.tamtam.ai/l/financial-services-firms-california) (711)
- [Financial Services companies in California](https://www.tamtam.ai/l/financial-services-companies-california) (642)
- [Healthcare providers in California](https://www.tamtam.ai/l/healthcare-providers-california) (569)
- [AI-native companies in California](https://www.tamtam.ai/l/ai-native-companies-california) (561)
- [Hospitals and Health Care companies in California](https://www.tamtam.ai/l/hospitals-and-health-care-companies-california) (555)
- [Consulting firms in California](https://www.tamtam.ai/l/consulting-firms-california) (551)
- [Public sector organisations in California](https://www.tamtam.ai/l/public-sector-organisations-california) (535)

## The same list elsewhere in United States

- [Architecture and Planning companies in the United States](https://www.tamtam.ai/l/architecture-and-planning-companies-united-states) (436)
- [Architecture and Planning companies in New York State](https://www.tamtam.ai/l/architecture-and-planning-companies-new-york-state) (75)
- [Architecture and Planning companies in Texas](https://www.tamtam.ai/l/architecture-and-planning-companies-texas) (28)
- [Architecture and Planning companies in New York](https://www.tamtam.ai/l/architecture-and-planning-companies-new-york) (55)

## The same list elsewhere

- [Architecture and Planning companies in the world](https://www.tamtam.ai/l/architecture-and-planning-companies-in-the-world) (1,380)

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Source: https://www.tamtam.ai/l/architecture-and-planning-companies-california