St Peter Port·Professional services
✦Active since 1975
RICS-regulated architectural and surveying practice in St Peter Port, established 1975.
Twenty-four firms — a chartered-consultancy core (CBL, Hartigan, Marquis Surveys), marine and ground-engineering contractors (Geomarine, NSP, Siteweld), and steel fabricators (Guernsey Metals). Twenty are limited companies; six belong to the Chamber of Commerce. The oldest, Rihoy & Son, has traded since 1924; the newest opened in 2011. —
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St Peter Port·Professional services
✦Active since 1975
RICS-regulated architectural and surveying practice in St Peter Port, established 1975.
St Peter Port·Professional services
✦Active since 1971
Civil and structural engineering consultancy, established in 1971 as Guernsey's first locally-based consulting engineers and certified by ACE and IStructE.
St Sampson
✦1924 centenary firm
Family-owned across four generations
Family-owned construction company founded in 1924, offering new builds, refurbishment, and bespoke joinery for residential, commercial, and public-sector clients.
St Peter Port·Professional services·Est. 1990
Part of T&G Group of Companies
Civil and structural engineering firm established in 1990, providing design, surveys, and project management services across the Channel Islands.
—·Professional services·Est. 1981
Civil and structural engineering consultancy established in 1981, serving Jersey and Guernsey.
Vale·Est. 1990
Part of Keda Group (CI) Limited
Civil and marine construction company offering steel fabrication, welding, and crane hire across the Channel Islands and beyond.
St Peter Port·Professional services·Est. 1997
The Channel Islands' only RICS-regulated chartered land and engineering surveying consultancy, founded in 1997.
St Sampson·Est. 1996
Metalwork and fabrication specialist established in 1996, offering bespoke fabrication, coded welding, and laser cleaning with a team of over 20 in St Sampson.
St Sampson·Professional services·Est. 1982
Engineering Council registered civil and structural engineering consultancy, specialising in structural glass, oak frame design, and historic building renovation.
Vale·Est. 1998
Part of Formerly Garenne Group (independent since November 2022 via management buy-out)
Civil engineering and marine construction contractor established in Guernsey in 1998, operating across the Channel Islands.
St Peter Port·Professional services·Est. 1984
Part of Hartigan (Jersey HQ: Titan House, Liberation Square, St Helier)
Multidisciplinary consulting engineering practice offering structural, civil, geotechnical, environmental, and historic building conservation services across the Channel Islands.
Vale
Part of Annandale Limited
Annandale Structural Concrete (ASC) manufactures pre-cast and pre-stressed concrete products, including lintels, sills, and beam & block flooring, for the Channel Islands construction industry.
Torteval·Professional services
Architectural design firm offering architectural design and building engineering services across Guernsey and the Channel Islands.
Forest·Est. 1994
Forest-based civil and structural engineering firm established in 1994, specialising in concreting, drainage, and scaffolding, with plant hire available across the Bailiwick and UK.
St Peter Port
Part of Trant Engineering Ltd
Civil engineering contractor and approved utility contractor, the Guernsey arm of Trant Engineering Ltd.
Vale·Est. 2005
Vale-based Guernsey construction company specialising in residential new builds, extensions, refurbishments, and groundworks.
Forest
Builder specialising in groundworks, drainage, extensions, garages, renovations, hard landscaping, new builds, oak frame structures, blocklaying, brickwork, and sub-contracting.
St Peter Port
Specialist working-at-height safety company with over 17 years of experience in fall protection, offering system design, installation, and training for Guernsey and Jersey.
St Pierre du Bois·Est. 2011
Limited company established in 2011, specialising in new builds, extensions, renovations, drainage, and groundworks across Guernsey.
Vale·Est. 1993
Vale-based construction company offering residential, commercial, and civil engineering services.
St Sampson·Est. 2010
Part of Associated with J W Rihoy & Son Ltd (directors Gavin and Jeremy Rihoy)
NSP Civil Engineering Limited, trading as NSP Foundations Ltd, is a civil engineering and foundation piling specialist based in St Sampson.
Vale
Described as Guernsey's oldest welding and fabrication company, offering structural steel, balustrades, cladding, and fire escapes.
Torteval
Small Torteval building company specialising in patios, pathways, fences, paving, walls, and drainage.