# The 50 largest Architecture and Planning companies in the United Kingdom

Tamtam tracks 90 Architecture and Planning companies headquartered in the United Kingdom. This list ranks the 50 largest by number of employees on LinkedIn, led by Foster + Partners, Automotive Market and 10N Collective. Their median headcount is 357. Half of them were founded in 1976 or later. The most common headquarters are London (33), Lichfield (2) and Manchester (2).

This selection of companies in the United Kingdom primarily showcases established architecture and planning firms. Companies like Foster + Partners, ZHA, and Grimshaw are global architectural practices, while PRP focuses on housing design and urban regeneration. The Northern Ireland Housing Executive provides housing services in its region.

A notable trend among these companies is the strong concentration of headquarters in London, indicating the city's role as a central hub for architecture and planning in the UK. Many of these firms also have a long history, with several founded in the mid-20th century or earlier, such as RIBA (1834) and AHR (1835).

🇬🇧 United Kingdom · 50 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |  |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [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 |  |
| 7 | [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 |
| 8 | [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 |
| 9 | [Freelance Architect](https://www.tamtam.ai/c/freelance-architect) (freelancehubs.com)<br>Hire freelance architects for project-based work, paying only for hours worked Find skilled freelancers for affordable architecture services on our platform | Architecture and Planning | 🇬🇧 London | 668 |  |
| 10 | [Pegasus Group](https://www.tamtam.ai/c/pegasus-group) (pegasusgroup.co.uk)<br>Specialists in planning and development, providing expert solutions and services since 2003 Dedicated to delivering excellence and success for clients' goals | Architecture and Planning | 🇬🇧 Lichfield | 665 | 2003 |
| 11 | [Benoy](https://www.tamtam.ai/c/benoy) (benoy.com)<br>A global design specialist committed to delivering iconic and sustainable solutions for the built environment through creative commerciality and innovative design strategies | Architecture and Planning | 🇬🇧 London | 610 | 1947 |
| 12 | [Grimshaw](https://www.tamtam.ai/c/grimshaw) (grimshaw.global)<br>A global architecture practice with offices worldwide, specializing in designing innovative, sustainable buildings across various sectors and winning numerous awards | Architecture and Planning | 🇬🇧 London | 531 | 1980 |
| 13 | [PRP](https://www.tamtam.ai/c/prp) (prp-co.uk)<br>An interdisciplinary design practice with 60 years' experience in housing design and urban regeneration, delivering intelligent, enduring designs for lasting communities | Architecture and Planning | 🇬🇧 London | 520 | 1963 |
| 14 | [tp bennett](https://www.tamtam.ai/c/tp-bennett) (tpbennett.com)<br>Independent architectural and design practice with over 100 years of experience, offering cross-sector expertise and a strong international presence. | Architecture and Planning | 🇬🇧 London | 482 | 1921 |
| 15 | [AHR](https://www.tamtam.ai/c/ahr) (ahr.co.uk)<br>This architecture and building consultancy firm focuses on creating positive, sustainable spaces, embracing innovation, and promoting social value and inclusivity | Architecture and Planning | 🇬🇧 Manchester | 473 | 1835 |
| 16 | [Broadway Malyan](https://www.tamtam.ai/c/broadway-malyan) (broadwaymalyan.com)<br>Global urbanism practice specializing in sustainable architecture, urban design, and placemaking to create thriving communities and environments. | Architecture and Planning | 🇬🇧 Waterloo | 466 | 1958 |
| 17 | [Sheppard Robson](https://www.tamtam.ai/c/sheppard-robson) (sheppardrobson.com)<br>collective of architects, interior designers, and masterplanners, designing people-centred buildings, spaces, and places with a focus on sustainability and innovation for life. | Architecture and Planning | 🇬🇧 London | 444 | 1938 |
| 18 | [10 Design](https://www.tamtam.ai/c/10-design) (10design.co)<br>An international architecture and master planning practice, specializing in innovative design solutions for multicultural projects across the globe | Architecture and Planning | 🇬🇧 London | 424 | 2010 |
| 19 | [DPP](https://www.tamtam.ai/c/dpp) (dppukltd.com)<br>This company provides specialized planning services for developers, landowners, businesses, and public sector bodies, focusing on land development and use | Architecture and Planning | 🇬🇧 Cardiff | 423 | 2012 |
| 20 | [LUC](https://www.tamtam.ai/c/luc) (landuse.co.uk)<br>An award-winning environmental consultancy specializing in holistic services to create sustainable cities, towns, and landscapes while addressing climate and biodiversity crises | Architecture and Planning | 🇬🇧 London | 405 | 1966 |
| 21 | [Chapman Taylor](https://www.tamtam.ai/c/chapman-taylor) (chapmantaylor.com)<br>An award-winning global architecture and masterplanning practice, specializing in designing successful and creative mixed-use environments for residential, retail, leisure, hospitality, and office spaces | Architecture and Planning | 🇬🇧 Paddington | 397 | 1959 |
| 22 | [Purcell](https://www.tamtam.ai/c/purcell) (purcellarchitecture.com)<br>A multidisciplinary team of architects, designers, and consultants specializing in transforming and creating innovative spaces for clients across the UK and Asia Pacific | Architecture and Planning | 🇬🇧 London | 394 | 1947 |
| 23 | [Home & Maker](https://www.tamtam.ai/c/home-and-maker) (homeandmaker.com)<br>This company provides online architecture services for domestic home design, allowing homeowners to collaborate with experienced architects and designers on various projects | Architecture and Planning | 🇬🇧 London | 386 |  |
| 24 | [RMJM](https://www.tamtam.ai/c/rmjm) (rmjm.com)<br>A global architecture firm with diverse expertise, creating iconic designs for over 60 years across five continents | Architecture and Planning | 🇬🇧 Edinburgh | 381 | 1956 |
| 25 | [Turley](https://www.tamtam.ai/c/turley) (turley.co.uk)<br>Specializing in advisory services for the built environment and more, we collaborate with clients to create thriving places and communities Offering various services for effectiveness | Architecture and Planning | 🇬🇧 Manchester | 357 | 1983 |
| 26 | [Allford Hall Monaghan Morris](https://www.tamtam.ai/c/allford-hall-monaghan-morris) (ahmm.co.uk)<br>Designing and reinventing buildings across commercial, residential, healthcare, life sciences, education, and civic sectors in the UK and internationally | Architecture and Planning | 🇬🇧 London | 355 | 1989 |
| 27 | [HLM Architects](https://www.tamtam.ai/c/hlm-architects) (hlmarchitects.com)<br>An employee-owned architectural practice focused on thoughtful design, creating memorable spaces that improve lives and win accolades for their inclusive culture and social impact initiatives | Architecture and Planning | 🇬🇧 Sheffield | 352 | 1964 |
| 28 | [Stride Treglown](https://www.tamtam.ai/c/stride-treglown) (stridetreglown.com)<br>Employee-owned architectural practice specializing in designing Better Places for various sectors, emphasizing Empowered People and Resilient Partnerships with purpose-driven design | Architecture and Planning | 🇬🇧 Bristol | 350 | 1953 |
| 29 | [Ryder Architecture](https://www.tamtam.ai/c/ryder-architecture) (ryderarchitecture.com)<br>This company is an architectural practice with diverse expertise, leading integrated projects to deliver value and positive impact for clients and communities worldwide | Architecture and Planning | 🇬🇧 Newcastle upon Tyne | 333 | 1953 |
| 30 | [Pascall+Watson](https://www.tamtam.ai/c/pascall-watson) (pascalls.co.uk)<br>Offers architecture, masterplanning, interior design, wayfinding, and BIM expertise for transportation, education, leisure, and other sectors globally since 1956. | Architecture and Planning | 🇬🇧 London | 328 | 1956 |
| 31 | [SHH Architecture & Interiors](https://www.tamtam.ai/c/shh-architecture-and-interiors) (shh.co.uk)<br>Award-winning architectural and interior design practice founded in 1991, based in London, working globally across residential, hospitality, and commercial sectors | Architecture and Planning | 🇬🇧 London | 315 | 1991 |
| 32 | [NLA](https://www.tamtam.ai/c/nla) (nla.london)<br>An independent center for London's built environment, facilitating discussions and events to shape a better city through research and exhibitions | Architecture and Planning | 🇬🇧 London | 313 | 2005 |
| 33 | [Allies and Morrison](https://www.tamtam.ai/c/allies-and-morrison) (alliesandmorrison.com)<br>Designing lasting buildings and shaping enduring urban spaces, focusing on detailed craftsmanship and context, with a collaborative, multidisciplinary approach. | Architecture and Planning | 🇬🇧 London | 311 | 1984 |
| 34 | [Royal Town Planning Institute](https://www.tamtam.ai/c/royal-town-planning-institute) (rtpi.org.uk)<br>The organization champions planning for prosperous communities, shaping policies and setting professional standards to address complex challenges in the UK | Architecture and Planning | 🇬🇧 London | 309 | 1914 |
| 35 | [LDA Design](https://www.tamtam.ai/c/lda-design) (lda-design.co.uk)<br>LDA Design creates great places by connecting people and landscape, specializing in urban design, renewable energy, and public realm projects | Architecture and Planning | 🇬🇧 Peterborough | 272 | 1979 |
| 36 | [Lichfields UK](https://www.tamtam.ai/c/lichfields-uk) (lichfields.uk)<br>A leading planning and development consultancy in the UK, delivering insight, innovation, and advice to create exceptional places for future generations | Architecture and Planning | 🇬🇧 London | 272 | 1962 |
| 37 | [Hawkins\Brown](https://www.tamtam.ai/c/hawkins-brown) (hawkinsbrown.com)<br>Design and deliver innovative, socially sustainable buildings across education, workplace, residential, infrastructure, and community sectors with collaborative approach. | Architecture and Planning | 🇬🇧 London | 252 | 1988 |
| 38 | [HTA Design](https://www.tamtam.ai/c/hta-design) (hta.co.uk)<br>A multi-disciplinary practice specializing in housing and regeneration, with teams in architecture, landscape design, planning, urban design, sustainability, and graphic design | Architecture and Planning | 🇬🇧 London | 242 | 1969 |
| 39 | [Boyer](https://www.tamtam.ai/c/boyer) (boyerplanning.co.uk)<br>A multi-skilled planning consultancy offering expertise in planning, design, development economics, and sustainability for projects of any scale or type | Architecture and Planning | 🇬🇧 Blackwater | 181 | 1985 |
| 40 | [Hopkins Architects](https://www.tamtam.ai/c/hopkins-architects) (hopkins.co.uk)<br>An international architectural practice with studios in London and Dubai, focusing on clear design thinking, material potential, craft, and context for innovative buildings worldwide | Architecture and Planning | 🇬🇧 London | 171 | 1976 |
| 41 | [ADP Architecture](https://www.tamtam.ai/c/adp-architecture) (adp-architecture.com)<br>Innovative architecture firm focused on creating positive experiences for people and communities through sustainable, engaging, and belonging-focused design solutions | Architecture and Planning | 🇬🇧 London | 164 | 1965 |
| 42 | [Design With Hemp](https://www.tamtam.ai/c/design-with-hemp) (gmp-design.com)<br>A customer-focused sports and wellbeing business with a strong emphasis on water safety, offering services such as swimming lessons, aqua therapy, and nutrition support | Architecture and Planning | 🇬🇧 Lichfield | 164 | 2024 |
| 43 | [Donald Insall Associates](https://www.tamtam.ai/c/donald-insall-associates) (donaldinsallassociates.co.uk)<br>Architectural practice specializing in conservation, heritage consultancy, and new design within historic settings, balancing tradition with transformation for purposeful, resilient environments. | Architecture and Planning | 🇬🇧 London | 162 | 1958 |
| 44 | [Resi](https://www.tamtam.ai/c/resi) (resi.co.uk)<br>Innovative home transformation company with a team of specialists offering financing, design, planning, and construction services supported by industry-leading technology | Architecture and Planning | 🇬🇧 London | 160 | 2017 |
| 45 | [CABE](https://www.tamtam.ai/c/cabe) (webarchive.nationalarchives.gov.uk)<br>Providing expert independent design advice to improve the quality of buildings and spaces in England through public engagement and professional debate | Architecture and Planning | 🇬🇧 London | 159 | 1999 |
| 46 | [Howells](https://www.tamtam.ai/c/howells) (howells.uk)<br>A collaborative team of architects and designers internationally creates sustainable, low-energy buildings while investing in education and career development | Architecture and Planning | 🇬🇧 Birmingham | 157 | 1990 |
| 47 | [Quod](https://www.tamtam.ai/c/quod-london) (quod.com)<br>Specialist consultancy in planning, development economics, socio-economics, and environmental assessments with a team of 80+ professionals in London and Leeds offices | Architecture and Planning | 🇬🇧 London | 155 | 2010 |
| 48 | [fabrik](https://www.tamtam.ai/c/fabrik) (linktr.ee)<br>A multi-disciplinary landscape and masterplanning practice creating sustainable, natural environments to improve community well-being and benefit the planet | Architecture and Planning | 🇬🇧 London | 150 | 2003 |
| 49 | [Twyford](https://www.tamtam.ai/c/twyford) (twyfordbathrooms.com)<br>Innovative bathroom products with a focus on design, quality, environmental sustainability, and technological advancements, backed by excellent customer service and industry partnerships | Architecture and Planning | 🇬🇧 Warwick | 150 |  |
| 50 | [Adjaye Associates](https://www.tamtam.ai/c/adjaye-associates) (adjaye.com)<br>Global architectural firm led by Sir David Adjaye OBE, known for multicultural team, iconic designs worldwide, and prestigious awards in architecture industry | Architecture and Planning | 🇬🇧 London | 148 | 2000 |

## 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 14, 2026.

## More company lists in the United Kingdom

- [The largest companies in the United Kingdom](https://www.tamtam.ai/l/largest-companies-united-kingdom) (36,547)
- [Multinational companies in the United Kingdom](https://www.tamtam.ai/l/multinational-companies-united-kingdom) (7,458)
- [Financial services firms in the United Kingdom](https://www.tamtam.ai/l/financial-services-firms-united-kingdom) (3,711)
- [Financial Services companies in the United Kingdom](https://www.tamtam.ai/l/financial-services-companies-united-kingdom) (3,696)
- [Retail chains in the United Kingdom](https://www.tamtam.ai/l/retail-chains-united-kingdom) (3,289)
- [Professional services firms in the United Kingdom](https://www.tamtam.ai/l/professional-services-firms-united-kingdom) (2,706)
- [Software Development companies in the United Kingdom](https://www.tamtam.ai/l/software-development-companies-united-kingdom) (2,600)
- [Manufacturers in the United Kingdom](https://www.tamtam.ai/l/manufacturers-united-kingdom) (2,159)
- [Companies with in-house R&D in the United Kingdom](https://www.tamtam.ai/l/r-and-d-companies-united-kingdom) (1,930)
- [IT Services and IT Consulting companies in the United Kingdom](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-kingdom) (1,722)
- [Retail companies in the United Kingdom](https://www.tamtam.ai/l/retail-companies-united-kingdom) (1,596)
- [IT services companies in the United Kingdom](https://www.tamtam.ai/l/it-services-companies-united-kingdom) (1,583)
- [Hotel and hospitality groups in the United Kingdom](https://www.tamtam.ai/l/hospitality-groups-united-kingdom) (1,461)
- [Companies with a mobile app in the United Kingdom](https://www.tamtam.ai/l/companies-with-mobile-app-united-kingdom) (1,411)
- [Consulting firms in the United Kingdom](https://www.tamtam.ai/l/consulting-firms-united-kingdom) (1,298)
- [E-commerce companies in the United Kingdom](https://www.tamtam.ai/l/ecommerce-companies-united-kingdom) (1,246)
- [Hardware manufacturers in the United Kingdom](https://www.tamtam.ai/l/hardware-companies-united-kingdom) (1,239)
- [Family-owned companies in the United Kingdom](https://www.tamtam.ai/l/family-owned-companies-united-kingdom) (1,224)
- [Hospitality companies in the United Kingdom](https://www.tamtam.ai/l/hospitality-companies-united-kingdom) (1,204)
- [Critical infrastructure operators in the United Kingdom](https://www.tamtam.ai/l/critical-infrastructure-operators-united-kingdom) (1,195)
- [Wellness and Fitness Services companies in the United Kingdom](https://www.tamtam.ai/l/wellness-and-fitness-services-companies-united-kingdom) (1,151)
- [Retail Apparel and Fashion companies in the United Kingdom](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-united-kingdom) (1,085)
- [Subscription businesses in the United Kingdom](https://www.tamtam.ai/l/subscription-businesses-united-kingdom) (1,077)
- [Distributors and wholesalers in the United Kingdom](https://www.tamtam.ai/l/distributors-and-wholesalers-united-kingdom) (1,060)

## The same list elsewhere in United Kingdom

- [Architecture and Planning companies in England](https://www.tamtam.ai/l/architecture-and-planning-companies-england) (78)
- [Architecture and Planning companies in London](https://www.tamtam.ai/l/architecture-and-planning-companies-london) (45)

## The same list elsewhere

- [Architecture and Planning companies in the world](https://www.tamtam.ai/l/architecture-and-planning-companies-in-the-world) (1,381)
- [Architecture and Planning companies in Europe](https://www.tamtam.ai/l/architecture-and-planning-companies-in-europe) (672)

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