# List of Architecture and Planning companies in the world

Tamtam tracks 1,380 Architecture and Planning companies worldwide. This list ranks the 100 largest by number of employees on LinkedIn, led by CHINA STATE CONSTRUCTION (CSCEC), Gensler and Studio Tecnico. Their median headcount is 1,278. Half of them were founded in 1975 or later. The most common headquarters are London (7), New York (6) and Paris (5).

These are large companies in the architecture and planning sector worldwide, many of which are headquartered in the United States and Europe. The companies primarily offer architecture, design, and planning services, often with a focus on sustainability and innovation. Some also specialize in construction, interior design, and landscape architecture.

Notable firms include Gensler, a global architecture, design, and planning firm; HOK, offering design, architecture, engineering, and planning services; and Perkins&Will, a design and architecture firm creating healthy and beautiful spaces. Foster + Partners is a global architecture and design studio focusing on sustainable urbanism. The list also features Studio Tecnico, specializing in renovations and new constructions, and Interior Company, offering home construction and interior design services in India and UAE.

🌍 World · 100 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHINA STATE CONSTRUCTION (CSCEC)](https://www.tamtam.ai/c/china-state-construction-cscec-beijing) (cscec.com.cn)<br>A leading construction and real estate conglomerate in China, specializing in housing construction, international contracting, infrastructure development, and real estate investment | Architecture and Planning | 🇨🇳 Beijing | 37,581 |  |
| 2 | [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 |
| 3 | [Studio Tecnico](https://www.tamtam.ai/c/studio-tecnico-fiano-romano) (blcristrutturazioni.com)<br>A dynamic construction company in Rome specializing in renovations and new constructions, guiding clients from initial planning to project completion Offers design and bureaucratic support | Architecture and Planning | 🇮🇹 Fiano Romano | 6,298 | 2005 |
| 4 | [Agriculture](https://www.tamtam.ai/c/agriculture-bengaluru) (sevenbucksirrigation.com)<br>This company specializes in designing and managing landscape projects for residential and commercial properties, using technology to save resources and provide accurate results globally | Architecture and Planning | 🇮🇳 Bengaluru | 4,843 | 2006 |
| 5 | [HOK](https://www.tamtam.ai/c/hok) (hok.com)<br>A global firm offering design, architecture, engineering, and planning services to create sustainable and innovative solutions for clients and communities | Architecture and Planning | 🇺🇸 New York | 3,080 | 1955 |
| 6 | [Perkins&Will](https://www.tamtam.ai/c/perkins-and-will) (perkinswill.com)<br>Design and architecture firm creating healthy, beautiful spaces worldwide with expertise in architecture, interior design, urban and landscape planning. | Architecture and Planning | 🇺🇸 Chicago | 3,060 | 1935 |
| 7 | [Foster + Partners](https://www.tamtam.ai/c/foster-partners) (fosterandpartners.com)<br>Global architecture and design studio focusing on sustainable urbanism, with diverse international teams and worldwide offices. | Architecture and Planning | 🇬🇧 London | 3,025 | 1967 |
| 8 | [Automotive Market](https://www.tamtam.ai/c/automotive-market)<br>The company offers comprehensive social media marketing services, including strategy, content creation, campaign management, and data analysis to help businesses thrive online | Architecture and Planning | 🇬🇧 London | 3,000 |  |
| 9 | [Studio di Architettura](https://www.tamtam.ai/c/studio-di-architettura) (antoniodaprile.it)<br>Providing architecture, design, and interior design services focused on creating functional and aesthetically pleasing spaces for clients. | Architecture and Planning | 🇬🇷 | 2,998 |  |
| 10 | [HKS, Inc.](https://www.tamtam.ai/c/hks-inc) (hksinc.com)<br>A global architecture and design firm with a focus on sustainability, creativity, and delivering elegant solutions for clients and collaborators | Architecture and Planning | 🇺🇸 Dallas | 2,916 | 1939 |
| 11 | [Interior Company](https://www.tamtam.ai/c/interior-company) (interiorcompany.com)<br>A subsidiary of a major real estate platform, this company in India and UAE offers hassle-free home construction and interior design services | Architecture and Planning | 🇮🇳 Gurugram | 2,834 | 2021 |
| 12 | [École](https://www.tamtam.ai/c/ecole) (ecole.co)<br>A multidisciplinary Paris-based architecture studio founded by Nicolas Simon and Max Turnheim, specializing in architecture, furniture, graphic design, and exhibition set design | Architecture and Planning | 🇫🇷 Paris | 2,667 | 2007 |
| 13 | [WORKac](https://www.tamtam.ai/c/workac) (work.ac)<br>Award-winning architecture firm focused on public, cultural, and civic projects worldwide, emphasizing social and environmental concerns through intelligent and playful design | Architecture and Planning | 🇺🇸 New York | 2,654 | 2003 |
| 14 | [KONTRAKTOR INDONESIA](https://www.tamtam.ai/c/kontraktor-indonesia) (youtube.com)<br>This company offers consulting, contracting, architectural services, renovation, interior and exterior design, landscaping, supervision, materials, maintenance, and construction for various types of properties | Architecture and Planning | 🇮🇩 Sentulcity Bogor | 2,426 | 2010 |
| 15 | [LAR](https://www.tamtam.ai/c/lar) (lar.mx)<br>A young design and construction firm focused on creating environments that meet client needs, convey clear messages, and generate unique experiences | Architecture and Planning | 🇲🇽 Naucalpan De Juárez | 2,278 |  |
| 16 | [Estudio de Arquitectura](https://www.tamtam.ai/c/estudio-de-arquitectura) (gabaldonarquitecto.es)<br>A Sevilla-based company since 1994, specializing in residential, commercial, and industrial building projects with a focus on customized architecture and energy efficiency | Architecture and Planning | 🇪🇸 Seville | 2,258 | 1994 |
| 17 | [Skidmore, Owings & Merrill (SOM)](https://www.tamtam.ai/c/skidmore-owings-and-merrill-som) (som.com)<br>A leading design firm creating environmentally-advanced solutions for a better future, recognized for carbon neutrality and commitment to equality | Architecture and Planning | 🇺🇸 New York | 2,247 | 1936 |
| 18 | [HGA](https://www.tamtam.ai/c/hga) (hga.com)<br>National design firm specializing in architecture and engineering, creating impactful and award-winning designs for healthcare, arts, education, government, science, technology, and energy sectors | Architecture and Planning | 🇺🇸 Minneapolis | 2,141 | 1953 |
| 19 | [DLR Group](https://www.tamtam.ai/c/dlr-group) (dlrgroup.com)<br>Integrated design firm specializing in architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse with a focus on sustainable design | Architecture and Planning | 🇺🇸 30 Offices | 2,067 | 1966 |
| 20 | [BIG - Bjarke Ingels Group](https://www.tamtam.ai/c/big-bjarke-ingels-group) (big.dk)<br>A global architecture firm based in multiple cities, specializing in innovative and pragmatic urban design, research, and development, with a focus on parental leave support | Architecture and Planning | 🇺🇸 Brooklyn | 1,994 | 2006 |
| 21 | [OLA](https://www.tamtam.ai/c/ola-austin) (olasustainability.com)<br>An Austin-based architecture practice focusing on sustainable design, offering project-specific strategies that integrate clients' design objectives and sustainability goals through a collaborative team approach | Architecture and Planning | 🇺🇸 Austin | 1,933 | 2011 |
| 22 | [SmithGroup](https://www.tamtam.ai/c/smithgroup) (smithgroup.com)<br>Innovative design & engineering firm using research, technology, and design thinking to tackle challenges in architecture, engineering, and environmental science globally | Architecture and Planning | 🇺🇸 Detroit | 1,926 | 1853 |
| 23 | [OMA](https://www.tamtam.ai/c/oma) (oma.com)<br>International architecture practice with a research and design studio, led by eight partners, known for innovative buildings worldwide, with offices in multiple cities | Architecture and Planning | 🇳🇱 Rotterdam | 1,905 | 1975 |
| 24 | [EHAF Consulting Engineers](https://www.tamtam.ai/c/ehaf-consulting-engineers) (ehaf.com)<br>Multidisciplinary engineering consultancy offering architecture, planning, civil, mechanical, electrical, infrastructure, and project management services across Middle East and Gulf regions. | Architecture and Planning | 🇦🇪 | 1,896 | 1971 |
| 25 | [Architect](https://www.tamtam.ai/c/architect) (architect.co.in)<br>Specializing in architecture and planning for various projects to create innovative and functional designs tailored to clients' needs and preferences | Architecture and Planning | 🇮🇳 N/a | 1,883 |  |
| 26 | [IDEA INC](https://www.tamtam.ai/c/idea-inc) (ideaincdesign.wetpaint.com)<br>Interior Design company in Mumbai offering customized design services for residential, hospitality, and commercial spaces Experienced in creating high-quality, versatile design concepts from start to finish | Architecture and Planning | 🇫🇷 Paris | 1,845 |  |
| 27 | [DAR ENGINEERING](https://www.tamtam.ai/c/dar-engineering) (dar-engineering.com)<br>Leading multidisciplinary consultancy firm providing design, architecture, engineering, project management, construction management, and planning services across various sectors to governments and companies. | Architecture and Planning | 🇸🇦 Riyadh | 1,803 |  |
| 28 | [CannonDesign](https://www.tamtam.ai/c/cannondesign) (cannondesign.com)<br>An integrated design firm leveraging creative thinkers to develop solutions for clients and society, focusing on human flourishing through Living-Centered Design | Architecture and Planning | 🇺🇸 New York | 1,761 | 1945 |
| 29 | [The American Institute of Architects (AIA)](https://www.tamtam.ai/c/the-american-institute-of-architects-aia) (aia.org)<br>An organization supporting architects and allied partners through advocacy, continuing education, contract documents, market research, conferences, awards, and promoting design excellence | Architecture and Planning | 🇺🇸 Washington | 1,757 | 1857 |
| 30 | [MTA](https://www.tamtam.ai/c/mta) (mtascape.com)<br>A design firm specializing in Landscape Architecture and Urban Design, dedicated to creating sophisticated, functional, and place-based design solutions for clients | Architecture and Planning | 🇨🇱 Santiago | 1,746 | 2005 |
| 31 | [10N Collective](https://www.tamtam.ai/c/10n-collective) (10ncollective.com)<br>Global collective of urbanism, architecture, and design experts focused on sustainable citymaking, environmental and social responsibility across continents. | Architecture and Planning | 🇬🇧 London | 1,735 | 2025 |
| 32 | [Studio tecnico Sabattini](https://www.tamtam.ai/c/studio-tecnico-sabattini) (studiosabattini.it)<br>A professional engineering studio specializing in civil and industrial construction projects, including technical design, safety coordination, energy diagnostics, and administrative support | Architecture and Planning | 🇮🇹 Bologna | 1,720 | 1970 |
| 33 | [OUI](https://www.tamtam.ai/c/oui-paris) (archi-oui.com)<br>An innovative architecture and design firm prioritizing research, collaboration, and user-centered projects that enhance their surroundings through unique perspectives | Architecture and Planning | 🇫🇷 Paris | 1,702 | 2013 |
| 34 | [TVS](https://www.tamtam.ai/c/tvs) (tvsdesign.com)<br>Award-winning architecture and interior design firm based in Atlanta, with global project expertise across various sectors, delivering creative solutions since 1968 | Architecture and Planning | 🇺🇸 Atlanta | 1,649 | 1968 |
| 35 | [LaBella Associates](https://www.tamtam.ai/c/labella-associates) (labellapc.com)<br>LaBella Associates is a nationally recognized Design Professional Corporation that creates partnerships with clients to deliver exceptional results in buildings, energy, infrastructure, and environmental projects | Architecture and Planning | 🇺🇸 Rochester | 1,613 | 1978 |
| 36 | [FCA](https://www.tamtam.ai/c/fca) (fcarchitects.com)<br>Full-service architectural and design firm creating resonant spaces for clients, incorporating collaboration, enhancing lives, and promoting environmental responsibility through defined, rigorous processes | Architecture and Planning | 🇺🇸 Philadelphia | 1,604 | 1954 |
| 37 | [Aedas](https://www.tamtam.ai/c/aedas) (aedas.com)<br>Global architecture and design practice creating world-class solutions with deep cultural understanding for communities, driving innovation and sustainability in urban planning worldwide | Architecture and Planning | 🇭🇰 Hong Kong | 1,593 |  |
| 38 | [Corgan](https://www.tamtam.ai/c/corgan) (corgan.com)<br>A leading architecture and design firm, prioritizing client and user needs, specializing in six market sectors with a focus on user-driven design | Architecture and Planning | 🇺🇸 Dallas | 1,564 | 1938 |
| 39 | [avocat](https://www.tamtam.ai/c/avocat)<br>An architecture agency specializing in design and planning services for various projects | Architecture and Planning | 🇫🇷 Paris | 1,537 | 1985 |
| 40 | [SSH Design](https://www.tamtam.ai/c/ssh-design) (sshic.com)<br>Multidisciplinary firm delivering architectural and engineering solutions for landmark projects across the Middle East and Africa with regional expertise and international design integrity. | Architecture and Planning | 🇦🇪 Dubai | 1,512 | 1961 |
| 41 | [KPF](https://www.tamtam.ai/c/kpf) (kpf.com)<br>Architectural practice designing diverse, innovative buildings globally, focusing on quality, contextual sensitivity, and smart solutions without stylistic constraints | Architecture and Planning | 🇺🇸 New York | 1,463 | 1976 |
| 42 | [CMA](https://www.tamtam.ai/c/cma) (core-states.com)<br>The company, now part of Core States Group, offers services related to engineering and architectural design Visit core-statescom for more information | Architecture and Planning | 🇺🇸 Ambler | 1,455 |  |
| 43 | [Page](https://www.tamtam.ai/c/page-washington) (pagethink.com)<br>Multidisciplinary design, architecture, and engineering firm with 1,300+ staff and international offices Specializing in complex projects across various sectors Visit wwwpagethinkcom for more information | Architecture and Planning | 🇺🇸 Washington | 1,448 |  |
| 44 | [华东建筑设计研究总院 ECADI](https://www.tamtam.ai/c/ecadi) (ecadi.com)<br>Renowned architectural design institute in China offering comprehensive services in architecture, urban planning, and more, specializing in diverse projects globally | Architecture and Planning | 🇨🇳 Shanghai | 1,446 | 1952 |
| 45 | [INTERIOR](https://www.tamtam.ai/c/interior) (interior.fr)<br>A company with over 40 years of expertise in designing and manufacturing high-end modular partition walls for adaptable environments with top quality and aesthetics | Architecture and Planning | 🇫🇷 Paris | 1,426 | 1981 |
| 46 | [NAO](https://www.tamtam.ai/c/nao) (naowork.com)<br>An award-winning design consultancy in Beijing specializing in architecture, interiors, products, and scenography for ambitious projects in Greater China | Architecture and Planning | 🇨🇳 Beijing | 1,393 | 2011 |
| 47 | [DPS Group Global](https://www.tamtam.ai/c/dps-group-global) (arcadis.com)<br>Global consulting, engineering, and construction management firm specializing in providing innovative solutions to high-tech industries worldwide | Architecture and Planning | 🇳🇱 Amsterdam | 1,391 | 1974 |
| 48 | [PBK](https://www.tamtam.ai/c/pbk) (pbk.com)<br>A leading architecture, engineering, and consulting practice specializing in design solutions for education, healthcare, corporate, government, and sports/events sectors since 1981 | Architecture and Planning | 🇺🇸 Houston | 1,366 |  |
| 49 | [outros](https://www.tamtam.ai/c/outros) (elkispaisagismo.com.br)<br>With over twenty years of experience, the company specializes in developing high-quality landscape architecture projects for demanding clients worldwide | Architecture and Planning | 🇧🇷 São Paulo | 1,363 |  |
| 50 | [ISG](https://www.tamtam.ai/c/isg-mankato) (isginc.com)<br>A multi-disciplinary firm with over 50 years of experience, owned by employees, serving various markets with collaboration, creativity, and diverse knowledge | Architecture and Planning | 🇺🇸 Mankato | 1,278 | 1973 |
| 51 | [ZHA](https://www.tamtam.ai/c/zha) (zha.com)<br>Design and creation of innovative cultural, corporate, and residential spaces that harmonize with natural topography and human-made environments. | Architecture and Planning | 🇬🇧 London | 1,250 | 1980 |
| 52 | [Woods Bagot](https://www.tamtam.ai/c/woods-bagot) (woodsbagot.com)<br>Global design studio with 17 studios in 6 regions, specializing in Architecture, Interiors, and Masterplanning Emphasizing collaboration and data-driven predictions of human behavior | Architecture and Planning | 🇦🇺 Melbourne | 1,233 | 1869 |
| 53 | [Bienes Y Raices](https://www.tamtam.ai/c/bienes-y-raices)<br>A real estate company specializing in buying, selling, and managing properties, offering expert guidance and services in the real estate market | Architecture and Planning | 🇸🇻 Ahuachapan | 1,150 | 2016 |
| 54 | [ACO Group](https://www.tamtam.ai/c/aco-group) (aco.com)<br>Design and manufacture of intelligent drainage and water treatment systems that collect, clean, retain, and reuse water sustainably worldwide. | Architecture and Planning | 🇩🇪 Büdelsdorf | 1,116 | 1946 |
| 55 | [Perkins Eastman](https://www.tamtam.ai/c/perkins-eastman) (perkinseastman.com)<br>Global architecture and design firm focusing on creating a positive impact on people's lives through progressive and inventive design solutions worldwide | Architecture and Planning | 🇺🇸 New York | 1,107 | 1981 |
| 56 | [Architectus](https://www.tamtam.ai/c/architectus) (architectus.com.au)<br>Architectural design practice focused on creating elegant, functional, and sustainable solutions across various sectors with a collaborative and human-centric approach | Architecture and Planning | 🇦🇺 Melbourne | 1,093 | 2001 |
| 57 | [Federal Capital Development Authority (FCDA)](https://www.tamtam.ai/c/federal-capital-development-authority-fcda) (fcda.gov.ng)<br>Leading the planning, design, and construction of a new Federal Capital to meet global standards, focusing on inclusivity, functionality, design, and aesthetics | Architecture and Planning | 🇳🇬 Garki | 1,076 |  |
| 58 | [Athié Wohnrath](https://www.tamtam.ai/c/athie-wohnrath) (athiewohnrath.com.br)<br>With over 25 years of experience, we specialize in innovative and high-quality architecture, construction, and technology projects that reflect people's values and companies' essence | Architecture and Planning | 🇧🇷 São Paulo | 1,073 | 1994 |
| 59 | [Dewan Architects & Engineers](https://www.tamtam.ai/c/dewan-architects-and-engineers) (dewan-architects.com)<br>Global multidisciplinary firm providing architecture, engineering, interior design, landscaping, master planning, sustainability, cost consultancy, and construction supervision services. | Architecture and Planning | 🇸🇦 | 1,050 | 1984 |
| 60 | [SsD](https://www.tamtam.ai/c/ssd-seoul) (ssdarchitecture.com)<br>An interdisciplinary architecture firm focused on integrating form, energy, and materials to achieve maximum effect through sustainable design solutions | Architecture and Planning | 🇰🇷 Seoul | 1,044 |  |
| 61 | [CCDI GROUP](https://www.tamtam.ai/c/ccdi-group) (ccdi.com.cn)<br>A global architecture and engineering consulting firm offering integrated services for urban construction and development, specializing in large span structures, high-rises, and city complexes | Architecture and Planning | 🇨🇳 | 1,029 | 1994 |
| 62 | [Northern Ireland Housing Executive](https://www.tamtam.ai/c/northern-ireland-housing-executive) (nihe.gov.uk)<br>A housing authority established in 1971 in Northern Ireland, providing services for socially rented, privately rented, and owner-occupied accommodation to meet housing needs for all | Architecture and Planning | 🇬🇧 Belfast BT2 8PB | 1,029 | 1971 |
| 63 | [AutoCAD Designer](https://www.tamtam.ai/c/autocad-designer) (org.uk)<br>Helping clients connect with top architects and architectural designers for their projects, ensuring they find the best professionals in the industry | Architecture and Planning | 🇬🇧 London | 1,019 |  |
| 64 | [Dorsch Gruppe](https://www.tamtam.ai/c/dorsch-gruppe) (dorsch.com)<br>An innovative consulting and engineering partner with a focus on transport, water, architecture, energy, and industry projects globally | Architecture and Planning | 🇩🇪 Frankfurt | 1,001 | 1951 |
| 65 | [ANJ Group](https://www.tamtam.ai/c/anj-group) (anj.co.in)<br>A leader in Turnkey Projects offering expert Project Managers, Contracting Labor force, Green Factory, and design services with a nationwide presence | Architecture and Planning | 🇮🇳 Mumbai | 978 | 1979 |
| 66 | [Engenheiro Civil](https://www.tamtam.ai/c/engenheiro-civil) (engenheirocivillondrina.com.br)<br>Civil Engineer offering affordable and experienced services in multiple locations, recognized for dedication and professionalism with a 5-star rating | Architecture and Planning | 🇧🇷 Londrina | 964 |  |
| 67 | [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 |
| 68 | [CAD](https://www.tamtam.ai/c/cad) (cadsa.mx)<br>We are a team of specialized architects in the conceptual and technical development of real estate projects, turning clients' dreams into reality through design, engineering, and construction | Architecture and Planning | 🇲🇽 Mexico City | 958 |  |
| 69 | [北京市建筑设计研究院有限公司](https://www.tamtam.ai/c/company-6660133) (biad.com.cn)<br>A leading state-owned architectural design company in Beijing, offering services in civil architecture, interior design, landscaping, urban planning, and engineering | Architecture and Planning | 🇨🇳 | 957 | 1949 |
| 70 | [Architect Hafeez Contractor](https://www.tamtam.ai/c/architect-hafeez-contractor) (hafeezcontractor.com)<br>Innovative architectural firm led by visionary Architect Hafeez Contractor, renowned for transforming urban landscapes and creating iconic structures worldwide | Architecture and Planning | 🇮🇳 Mumbai | 955 | 1982 |
| 71 | [DBA Group](https://www.tamtam.ai/c/dba-group) (dbagroup.it)<br>Holding group in civil engineering, plant design, architecture, project management, and software development for infrastructure management Focus on growth and synergy | Architecture and Planning | 🇮🇹 Villorba | 952 | 1991 |
| 72 | [NORR](https://www.tamtam.ai/c/norr) (norr.com)<br>Employee-owned A&E firm with 800 professionals in various sectors across multiple countries, focusing on purpose-driven design for sustainable and inclusive spaces | Architecture and Planning | 🇨🇦 Toronto | 947 | 1938 |
| 73 | [Independent Architecture](https://www.tamtam.ai/c/independent-architecture) (independentarchitecture.com)<br>Denver-based architecture office blending design with pop culture Specializing in unique projects like small building for Chicago Architecture Biennial and steel barn kit house | Architecture and Planning | 🇺🇸 Denver | 936 | 2009 |
| 74 | [Sabbour Consulting](https://www.tamtam.ai/c/sabbour-consulting) (sabbour.com)<br>A leading multidisciplinary engineering consulting firm offering project management, design, construction, and valuation services for clients in Egypt and abroad | Architecture and Planning | 🇪🇬 Cairo | 933 | 1957 |
| 75 | [HFA](https://www.tamtam.ai/c/hfa) (hfa-ae.com)<br>A full-service architectural and engineering firm with a diverse team empowering innovative design solutions for a variety of projects Flexible remote work options available | Architecture and Planning | 🇺🇸 Bentonville | 920 | 1990 |
| 76 | [DLZ Corporation](https://www.tamtam.ai/c/dlz-corporation) (dlz.com)<br>A top consulting firm in architecture/engineering, DLZ works on projects nationwide, focusing on client service, innovation, and turning visions into reality | Architecture and Planning | 🇺🇸 Columbus | 911 | 1946 |
| 77 | [CPL](https://www.tamtam.ai/c/cpl-fairport) (cplteam.com)<br>A multi-disciplined team of experts in design and engineering, specializing in projects for community, healthcare, education, and transportation sectors | Architecture and Planning | 🇺🇸 Fairport | 892 | 1975 |
| 78 | [NAC](https://www.tamtam.ai/c/nac-seattle) (nacarchitecture.com)<br>An award-winning design firm with expertise in education, healthcare, senior living, and community recreation, creating innovative spaces that enhance lives | Architecture and Planning | 🇺🇸 Seattle | 888 | 1960 |
| 79 | [Arquitectonica](https://www.tamtam.ai/c/arquitectonica) (arquitectonica.com)<br>A globally renowned architectural firm known for innovative, modern designs, with numerous awards and projects worldwide, pushing the boundaries of design | Architecture and Planning | 🇺🇸 Miami | 875 | 1977 |
| 80 | [Planungsbüro](https://www.tamtam.ai/c/planungsburo)<br>Passionate about planning and organization, this company specializes in providing strategic and innovative solutions to meet client needs | Architecture and Planning | 🇩🇪 Berlin | 864 |  |
| 81 | [ZGF Architects](https://www.tamtam.ai/c/zgf-architects) (zgf.com)<br>ZGF is a design firm rooted in Oregon, focusing on creating sustainable, community-oriented projects across North America with a humanistic approach | Architecture and Planning | 🇺🇸 Portland | 857 | 1942 |
| 82 | [Saudi Diyar Consultants](https://www.tamtam.ai/c/saudi-diyar-consultants) (diyar.com)<br>Leading multidiscipline design firm in the Middle East with diverse portfolio of commercial, institutional, residential, hospitality, healthcare, and urban design projects. | Architecture and Planning | 🇸🇦 Jeddah | 852 | 1985 |
| 83 | [PCA](https://www.tamtam.ai/c/pca) (pcadesign.com)<br>PCA is a prominent design firm in Greater Boston, offering architecture, planning, and interior design services with a focus on innovative and award-winning solutions | Architecture and Planning | 🇺🇸 Cambridge | 852 | 1982 |
| 84 | [VA+](https://www.tamtam.ai/c/va) (vertical-arts.com)<br>A Denver-based team of BIM professionals collaborates with architects and engineers globally to enhance BIM workflows and outcomes for successful design projects | Architecture and Planning | 🇺🇸 Denver | 847 | 2005 |
| 85 | [NBBJ Design](https://www.tamtam.ai/c/nbbj-design) (nbbj.com)<br>An innovative architecture and design firm creating dynamic environments for industry leaders and institutions worldwide, with a focus on community connectivity and sustainability | Architecture and Planning | 🇺🇸 Seattle | 841 | 1943 |
| 86 | [PT Yodya Karya (Persero)](https://www.tamtam.ai/c/pt-yodya-karya-persero) (g20sideevents.id)<br>A civil engineering organization based in Indonesia specializing in various construction projects and infrastructure development | Architecture and Planning | 🇮🇩 Jakarta | 839 |  |
| 87 | [SKETS Studio](https://www.tamtam.ai/c/skets-studio) (sketsstudio.com)<br>Global leader in BIM consultancy & design documentation services for architecture, interior design, and engineering industries, delivering value through expertise and innovation on luxury projects worldwide | Architecture and Planning | 🇮🇳 New Delhi | 806 | 2005 |
| 88 | [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 |
| 89 | [Hassell](https://www.tamtam.ai/c/hassell) (hassellstudio.com)<br>An international design practice with studios worldwide, creating the best places people love through holistic thinking and integrated design teams | Architecture and Planning | 🇦🇺 Melbourne | 791 | 1938 |
| 90 | [PAE](https://www.tamtam.ai/c/pae-portland) (pae-engineers.com)<br>An engineering firm specializing in mechanical, electrical, and technology system design, with a focus on sustainability, regenerative engineering, and community impact | Architecture and Planning | 🇺🇸 Portland | 783 | 1967 |
| 91 | [Architonic ArchDaily](https://www.tamtam.ai/c/architonic-archdaily)<br>A design platform with 200 million monthly pageviews, providing 450,000 product pages for architects and designers Focused on improving user experience and company culture | Architecture and Planning | 🇨🇭 Zurich | 783 | 2020 |
| 92 | [AECOM INDIA PRIVATE LIMITED](https://www.tamtam.ai/c/aecom-india-private-limited) (onlinecareer360.com)<br>Global provider of architecture, design, engineering, and construction services for public and private clients across various markets like transportation, facilities, and government | Architecture and Planning | 🇮🇳 Gurugram | 780 |  |
| 93 | [RIBA](https://www.tamtam.ai/c/riba) (riba.org)<br>Global professional membership body serving members and society to create better buildings, stronger communities, and a sustainable environment globally | Architecture and Planning | 🇬🇧 London | 779 | 1834 |
| 94 | [Colegio Oficial de Arquitectos de Madrid](https://www.tamtam.ai/c/colegio-oficial-de-arquitectos-de-madrid) (coam.org)<br>The Architect's Association represents and unites professionals in Madrid, promoting relationships, serving as a reference point, and fostering professional growth Visit us! | Architecture and Planning | 🇪🇸 Madrid | 768 |  |
| 95 | [Padams Group](https://www.tamtam.ai/c/padams-group) (padams.in)<br>Specializes in unique interior decoration, design, and architecture projects, following ethical values and guidance to turn dreams into reality | Architecture and Planning | 🇮🇳 Mumbai | 766 | 1992 |
| 96 | [SMMA](https://www.tamtam.ai/c/smma) (smma.com)<br>A multidisciplinary design firm balancing architecture, engineering, interiors, and site design to provide creative and technical expertise since 1955 | Architecture and Planning | 🇺🇸 Cambridge | 766 | 1955 |
| 97 | [P&T Architects and Engineers Ltd](https://www.tamtam.ai/c/p-and-t-architects-and-engineers-ltd) (p-t-group.com)<br>International architectural engineering practice offering design services in South East Asia, Middle East, and Africa, with a focus on excellence and improving quality of life through creative and award-winning projects | Architecture and Planning | 🇭🇰 Hong Kong | 762 | 1868 |
| 98 | [BNA](https://www.tamtam.ai/c/bna) (bna.nl)<br>The company focuses on strengthening architectural firms by lobbying, supporting, and promoting the added value of architects to society | Architecture and Planning | 🇳🇱 Amsterdam | 755 | 1842 |
| 99 | [OHM Advisors](https://www.tamtam.ai/c/ohm-advisors) (ohm-advisors.com)<br>AEP firm specializing in community advancement through multidisciplinary teamwork in architecture, engineering, and planning Award-winning work creating great places | Architecture and Planning | 🇺🇸 Livonia | 754 | 1962 |
| 100 | [ZRP](https://www.tamtam.ai/c/zrp) (zrparchitects.co.uk)<br>A dynamic design studio in London specializing in architecture for education, residential, commercial, and ecclesiastical buildings, with experience in listed structures | Architecture and Planning | 🇬🇧 London | 744 | 2012 |

## 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 13, 2026.

## More company lists in the world

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,089)
- [Multinational companies in the world](https://www.tamtam.ai/l/multinational-companies-in-the-world) (74,905)
- [Manufacturers in the world](https://www.tamtam.ai/l/manufacturers-in-the-world) (39,566)
- [Retail chains in the world](https://www.tamtam.ai/l/retail-chains-in-the-world) (35,498)
- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,334)
- [Financial services firms in the world](https://www.tamtam.ai/l/financial-services-firms-in-the-world) (26,817)
- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Education providers in the world](https://www.tamtam.ai/l/education-companies-in-the-world) (23,937)
- [IT Services and IT Consulting companies in the world](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-in-the-world) (23,571)
- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [SaaS companies in the world](https://www.tamtam.ai/l/saas-companies-in-the-world) (22,459)
- [IT services companies in the world](https://www.tamtam.ai/l/it-services-companies-in-the-world) (20,934)
- [Software Development companies in the world](https://www.tamtam.ai/l/software-development-companies-in-the-world) (20,534)
- [Hardware manufacturers in the world](https://www.tamtam.ai/l/hardware-companies-in-the-world) (20,150)
- [Financial Services companies in the world](https://www.tamtam.ai/l/financial-services-companies-in-the-world) (19,958)
- [Companies with a mobile app in the world](https://www.tamtam.ai/l/companies-with-mobile-app-in-the-world) (18,922)
- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,492)
- [Healthcare providers in the world](https://www.tamtam.ai/l/healthcare-providers-in-the-world) (16,037)
- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
- [Family-owned companies in the world](https://www.tamtam.ai/l/family-owned-companies-in-the-world) (14,667)
- [Distributors and wholesalers in the world](https://www.tamtam.ai/l/distributors-and-wholesalers-in-the-world) (13,470)
- [Hospitals and Health Care companies in the world](https://www.tamtam.ai/l/hospitals-and-health-care-companies-in-the-world) (12,916)
- [Corporate groups and holding companies in the world](https://www.tamtam.ai/l/holding-companies-in-the-world) (12,862)
- [E-commerce companies in the world](https://www.tamtam.ai/l/ecommerce-companies-in-the-world) (12,013)

## The same list elsewhere

- [Architecture and Planning companies in Europe](https://www.tamtam.ai/l/architecture-and-planning-companies-in-europe) (671)
- [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 France](https://www.tamtam.ai/l/architecture-and-planning-companies-france) (400)
- [Architecture and Planning companies in Asia](https://www.tamtam.ai/l/architecture-and-planning-companies-in-asia) (127)
- [Architecture and Planning companies in the United Kingdom](https://www.tamtam.ai/l/architecture-and-planning-companies-united-kingdom) (90)
- [Architecture and Planning companies in India](https://www.tamtam.ai/l/architecture-and-planning-companies-india) (66)
- [Architecture and Planning companies in Germany](https://www.tamtam.ai/l/architecture-and-planning-companies-germany) (51)
- [Architecture and Planning companies in Canada](https://www.tamtam.ai/l/architecture-and-planning-companies-canada) (35)
- [Architecture and Planning companies in Latin America](https://www.tamtam.ai/l/architecture-and-planning-companies-in-latin-america) (35)
- [Architecture and Planning companies in Africa](https://www.tamtam.ai/l/architecture-and-planning-companies-in-africa) (26)

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Source: https://www.tamtam.ai/l/architecture-and-planning-companies-in-the-world