Louis de Soissons provides Architecture, Project Management and Building Consultancy services in both the commercial and residential real estate sectors. Each service skill can be provided separately or combined to meet the specific needs of the project or client.

About us

We are an RIBA and RICS Chartered practice with offices in London and Hertfordshire with a diversity of skills and experience. This diversity enables us to provide creative, pragmatic and commercially considered solutions to our clients’ property requirements.

Our history

  • 1920s

    Welwyn Garden City

    Louis de Soissons Architects was founded in the 1920s by Louis E J G De Savoi-Carignan, Viscount d'Ostel Baron Longroy 1890 - 1962, younger son of Charles, 37th Count of Soissons.

    The practice's first major commission was the design for Welwyn Garden City. Louis de Soissons was appointed Architect for the town in 1920 and the practice was heavily involved in its development for the next 60 years. Other important projects during this time included the Home Office and various Duchy of Cornwall private estates in London.

  • 1930s – 1950s

    Wargraves Anzio

    After the war, the practice expanded and additional offices were opened in Plymouth and Exeter, carrying out a wide variety of architectural work including 46 war cemeteries in Italy and Greece.

  • 1960s – 1970s

    Lords Cricket Ground

    In the 1960s and 1970s amongst the practice's commissions were a number of prestigious headquarters buildings including The Royal College of Obstetricians and Gynaecologists in Regents Park, The Leathersellers Company, the Wellcome Foundation and the International Wool Secretariat in Carlton Terrace.

    The practice worked on major reconstruction projects in Regent's Park, for Crown Estates, including Nash's Cumberland and Chester Terraces. Other commissions included The Tavern and two stands for the MCC, both at Lords Cricket Ground. Projects in the educational sector included work at Cambridge and Exeter Universities and Eton College.

  • 1970s – 1980s

    Brighton Marina

    In the 1970's the practice designed the Brighton Marina, which was then one of the largest single building contracts in Europe.

    At the beginning of the 1980's, the practice designed headquarters buildings for Rowntree Macintosh, The Pharmaceutical Society, Danish Bacon and the Wellcome Trust in Regents Park.

Meet the team

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  • Mark Wilkinson

    Mark Wilkinson


    Mark is a Chartered Architectural Technologist and a member of the Association of Project Management.

    He has led project teams covering a wide spectrum of building types and sectors, including automotive design, commercial, high-end residential and fit out projects.

    Mark is Director responsible for Architecture.

  • Adam J. Mehmet

    Adam J. Mehmet


    Adam is a Chartered Surveyor providing professional services such as technical due diligence/ building surveys, project management and contract administration.

    He has particular experience in retail, outdoor digital media, office, healthcare and residential sectors.

    Adam is Director responsible for Project Management and Building Consultancy.


  • Robin Hewitt

    Robin Hewitt


    Robin Hewitt is a qualified Architect and registered with the Architects’ Registration Board. Robin has worked on a variety of projects in the commercial and education sectors, and the prestigious One New Change development designed by Jean Nouvel next to St Pauls Cathedral. At Louis de Soissons, Robin is responsible for projects across the whole of the practice including luxury vehicle showroom fit-out, residential extensions and new builds.

  • Michael Hill

    Michael Hill


    Michael is a Chartered Architect and a member of the RIBA and Arcuk.

    Michael joined The Louis De Soissons Partnership in 1984 and became a Partner in 2003. He has worked on projects across the country in both the commercial and residential sectors, including office developments, mixed use schemes and the conversion of Listed Buildings to retail and residential use.

  • Gerald Long

    Gerald Long


    Gerald is a Chartered Architect and a member of the Royal Institute of Chartered Architects.

    Gerald was educated at Highgate School in London and spent his early career working for London based architectural practices including Sir John Burnett Tait and Partners, and Richard Seifert and Partners.

    Gerald joined The Louis de Soissons Partnership in 1971 and became a Partner in 1991.

Our approach

We recognise that each project, client and sector have differing and specific commercial requirements. Our approach is to establish those requirements and then to provide a tailored service to achieve them.


A selection of our clients


Please contact us at the below email address for all enquiries relating to Architecture, Project Management and Building Consultancy.

Hertfordshire Office

Shoot Lodge, Lawrence End Road
Wandon Green

T. 01438 833 003

London Office

Oriel Buildings, 10 Margaret Street

T. 020 7979 2027