Regulated by Conservation & DesignAlderney Planning OfficeRIBACIAT
Twelve architectural practices — nine limited companies, one sole trader — clustered four in St Sampson, with the rest across six parishes. Two are RIBA-chartered, two MCIAT-chartered; the oldest is Paul Vaudin & Associates (1980), the newest a 2023 entrant. Tyrrell Dowinton runs a seventeen-strong RIBA Chartered Practice. —
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St Sampson·Professional services·Est. 2003
✦Largest team: 17
Tyrrell Dowinton Architects (TDA) is a RIBA Chartered Practice in St Sampson offering architectural design across residential, commercial, heritage, and leisure sectors.
St Martin·Professional services
Chartered Architectural Technologist practice in St Martin, offering residential and commercial design and construction services.
St Pierre du Bois·Est. 2019
CIAT Chartered Practice preparing planning permission and building licence documentation for new builds and conversions across Guernsey and Alderney.
Vale·Professional services
RIBA Chartered Architect and RIBA Chartered Practice with 17+ years of experience, specialising in 3D visualisation, accessible design, and planning consultancy.
Vale·Professional services·Est. 1996
Chartered Architectural Technologist practice in the Vale, offering domestic and commercial architectural design, planning, and building control services since 1996.
St Sampson·Professional services·Est. 2021
✦Most experience: 30+ years
Architectural design practice specialising in residential extensions and renovations, founded in 2021 by Aiden Potter who has over 30 years of experience.
St Sampson·Est. 1980
✦Oldest in this niche
Multi-disciplinary architectural practice established in 1980, undertaking alterations, extensions, new builds, refurbishments, and re-developments.
Castel·Professional services
RICS-regulated sole practice offering residential surveys and property valuations across Guernsey.
St Peter Port·Est. 2013
Architectural firm with 11 staff, designing buildings and interiors for private homeowners.
St Sampson
Architectural design firm founded in 2023 by its sole principal, Josh Matthews MCIAT, working on residential and commercial projects.
St Peter Port·Professional services
Chartered architectural practice in St Peter Port, trading as Turnstone Design, specialising in residential, commercial, and heritage design.
St Peter Port·Professional services
Architectural design firm in St Peter Port, specialising in home extensions, conversions, and new builds.
Forest·Professional services
Geoffrey E. Le Friec is a sole-practitioner architectural and building technologist offering residential design and planning services.