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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Genslergensler.com
Global architecture, design, and planning firm with a network of 6,000+ professionals creating positive change through impactful design across various sectors worldwide |
8,363 | |||
| 2 |
MIGmigcom.com
An organization specializing in planning, design, and sustainability of environments for human development, emphasizing inclusivity, community engagement, and strategic approaches |
963 | |||
| 3 | 795 | ||||
| 4 |
LPA, Inc.lpadesignstudios.com
LPA is a design firm focused on creating timeless, sustainable projects that benefit the environment, enrich human experiences, and inspire innovation |
731 | |||
| 5 |
WATG and Wimberly Interiorswatg.com
A top provider of integrated luxury hospitality design services, offering advisory, master planning, architecture, landscape design, and Wimberly Interiors |
656 | |||
| 6 |
SWAswagroup.com
Collective of eight independent studios specializing in landscape architecture, urban design, and planning with employee ownership structure. |
603 | |||
| 7 |
HMC Architectshmcarchitects.com
Employee-owned design firm established in 1940, focusing on creating impactful healthcare, education, and civic spaces in California through innovative designs |
587 | |||
| 8 |
AAInelsonworldwide.com
A full-service architecture, design, engineering, and consulting firm with a focus on corporate interior design and serving Bay Area technology clients |
550 | |||
| 9 | 528 | ||||
| 10 |
AOaoarchitects.com
Architectural firm established in 1974 specializing in Retail, Residential, and Mixed-Use projects with 50 years of experience and industry leadership |
452 | |||
| 11 |
LASD Studiolasdstudio.com
Global provider of landscape design, exterior design, landscape architecture, and urban design services in San Diego, New York, and Madrid |
438 | |||
| 12 | 433 | ||||
| 13 |
Archinectarchinect.com
Established in 1997, this online architecture community and content source provides job listings, news, events, discussions, and profiles for architects and students |
418 | |||
| 14 |
STUDIOS Architecturestudios.com
An international design practice with studios in multiple cities, specializing in creating built environments that reflect clients' organizations with collaboration and expertise |
417 | |||
| 15 | 323 | ||||
| 16 |
ALRalrinc.com
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 |
317 | |||
| 17 |
MBH Architectsmbharch.com
Full-service architectural firm with LEED Gold headquarters in San Francisco, specializing in creative design, technical execution, and sustainable, socially responsible projects globally |
313 | |||
| 18 |
RDC.rdcollaborative.com
A collaborative approach to creating enduring architecture, planning, interiors, and branding that enhance communities and brands through storytelling and strategic procurement |
307 | |||
| 19 |
DAHLIN Architecture | Planning | Interiorsdahlingroup.com
A diverse firm of multicultural professionals in architecture, planning, and interiors, collaborating to craft sustainable communities and urban environments |
236 | |||
| 20 |
RRM Design Grouprrmdesign.com
A multidisciplinary firm dedicated to creating sustainable and innovative environments throughout the west coast, known for its award-winning designs and collaborative culture |
231 | |||
| 21 |
DGAdgaonline.com
A planning, architecture, and interior design firm focused on creating environments that promote physical, mental, and social well-being for society |
202 | |||
| 22 |
ArchiCGIarchicgi.com
Professional 3D rendering services specializing in architectural visualization, interior/exterior design, product visualization, and furniture rendering Online client support available 24/7 |
170 | |||
| 23 |
CO Architectscoarchitects.com
This Los Angeles-based architectural firm specializes in designing innovative projects for higher education, science & technology, civic, and healthcare sectors nationwide |
168 | |||
| 24 |
CONG TY XAY DUNG TV-TK-XD PHAT THANHxaydungphatthanh.com
A reputable contractor specializing in designing and constructing residential buildings, townhouses, and villas in the city |
168 | |||
| 25 |
slantisslantis.com
The company partners with AEC organizations to enhance built projects using innovative BIM technology, providing streamlined solutions for architecture projects |
167 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
Nelson\Nygaard Consulting Associatesnelsonnygaard.com
Development of practical, sustainable transportation systems focused on mobility, equity, economic growth, and healthy, accessible communities nationwide. |
164 | |||
| 27 |
Taylor Designwearetaylor.com
A design firm specializing in architectural design, interior design, planning, and design strategy, with a focus on healthcare, science & technology, education, and senior living |
163 | |||
| 28 |
Ozel Officeozeloffice.com
Interdisciplinary design firm merging architecture, visual arts, and urban research to create innovative and sustainable solutions at the intersection of creativity and technology |
158 | |||
| 29 |
TETER Architects and Engineersteterae.com
Architects and engineers in Central Valley with deep community roots, focused on collaborative, value-driven design solutions for long-lasting client relationships |
151 | |||
| 30 |
Marmol Radzinermarmol-radziner.com
An award-winning design-build architecture and construction firm in Los Angeles, integrating architectural design with construction services for prestigious projects |
150 | |||
| 31 |
BAR Architects & Interiorsbararch.com
An architectural firm with a focus on sustainable design, diversity, and community involvement, creating engaging environments that enrich lives and exceed client expectations |
148 | |||
| 32 |
WRNS Studiowrnsstudio.com
Architectural firm specializing in sustainable, site-specific design for organizations, offering architecture, planning, and interior design services in various locations |
147 | |||
| 33 |
Studio-MLAstudio-mla.com
A design studio specializing in landscape architecture, urban design, and planning, with a focus on fostering human connection, community unity, and environmental restoration |
72 | |||
| 34 |
LEDDY MAYTUM STACY Architectslmsarch.com
Award-winning architecture firm in San Francisco specializing in sustainable design for affordable housing, education, adaptive re-use, historic rehabilitation, and more |
30 | |||
| 35 |
Flewelling & Moodyflewelling-moody.com
Design and planning firm since 1928, specializing in creative solutions that meet client needs, enhance functionality, and respect budgets |
27 | |||
| 36 |
BROOKS SCARPA HUBERbrooksscarpahuber.com
A collective of architects and designers creating innovative, sustainable, and iconic buildings and urban environments, blending art, craft, and holistic approaches |
23 | |||
| 37 |
domusstudio architecturedomusstudio.com
An award-winning architectural design studio specialized in creating sustainable, enriching, and collaborative spaces for residential, educational, public, and sacred purposes |
22 | |||
| 38 |
Marcatectsmarcatects.com
Architectural firm in San Diego area specializing in holistic approach to successful projects, utilizing BIM technology and focusing on sustainability |
22 | |||
| 39 |
Andrew Goodwin Designsandrewgoodwin.us
An architecture and design practice in California with a focus on sustainability and social impact, offering services for various project types |
17 | |||
| 40 |
GoPillar Academygopillaracademy.com
An e-learning platform offering high-level courses for architects and designers on planning software, methodology, 3D modeling, rendering, civil engineering, and more |
13 | |||
| 41 |
City Design Studiocitydesign-studio.com
Urban design, architecture, and planning firm dedicated to revitalizing communities and creating vibrant, extraordinary environments through strategic development and consensus building |
13 | |||
| 42 |
The New Farm, Contemporary Rural Architecturehouseplans.com
HousePlans offers high-quality architectural resources and guidance for building, remodeling, or renovating homes affordably and efficiently with thousands of design plans available |
12 | |||
| 43 |
Hollander Design Grouphollanderdg.com
A creative professional services company specializing in strategic planning, architecture, interior design, graphic design, and product design with a dedicated team approach |
12 | |||
| 44 |
Community Design + Architecturecommunity-design.com
Planning, urban design, and architecture firm focused on integrated transportation/land use planning, mixed-use community design, and sustainable development for public/private sectors |
10 | |||
| 45 |
Kevin Stephens Design Groupkevinstephensdesign.com
A San Francisco-based sustainable design and construction management firm specializing in building eco-friendly properties within any budget |
9 | |||
| 46 |
NEW THEMEnewtheme.net
An integrated design-build firm specializing in sustainable architecture that creates unique, custom projects for diverse clientele using innovative forms |
8 | |||
| 47 |
MacCracken Robinson Architectsmacarchs.com
An architectural firm specializing in creating unique, sustainable spaces that blend client goals with regulatory requirements and natural materials |
8 | |||
| 48 |
William Maston Architect & Associatesmastonarchitect.com
This full-service home design and remodeling architecture firm specializes in incorporating sustainable practices into new construction, additions, remodels, and hillside homes |
8 | |||
| 49 |
FutureSpace Corpenvironmentsbyrex.earth
Innovative real estate and architecture company creating dynamic, transformative living spaces with a focus on sustainability, health, and human connection |
7 | |||
| 50 |
DKY Architectstds-ae.com
The company focuses on designing creative, innovative buildings with sustainable features using the latest technology, materials, and systems, aiming for unique solutions |
7 | |||
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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.
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- Multinational companies in California 2,591
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- Software Development companies in California 1,649
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- Manufacturers in California 1,066
- Hardware manufacturers in California 985
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- Healthcare providers in California 569
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The same list elsewhere in United States
- Architecture and Planning companies in the United States 436
- Architecture and Planning companies in New York State 75
- Architecture and Planning companies in Texas 28
- Architecture and Planning companies in New York 55