St Sampson·Professional services·Est. 2021
This architectural design practice, founded in 2021, specialises in residential extensions, drawing on over 30 years of experience.
Extensions to houses and commercial premises.
Thirty-six firms offer extensions, with Altered Homes focusing solely on this work. For 22 others, including C.A. Duquemin Ltd, it is a main trade, while 13 more offer it within a broader portfolio. St Peter Port and Vale each hold eight firms. Rihoy & Son, founded in 1924, is the earliest established among the dated members. —
St Sampson·Professional services·Est. 2021
This architectural design practice, founded in 2021, specialises in residential extensions, drawing on over 30 years of experience.
St Martin·Professional services·Est. 2007
This architectural practice offers house extensions as a key part of its residential design and planning services.
Extensions and renovations (inferred from the source page)
Also Renovation & refurbishment · Interior design · Landscape gardening
Castel·Professional services·Est. 2013
A CIAT Chartered Architectural Practice that specialises in the design and planning of residential and commercial extensions.
Residential extensions (inferred from the source page)
Also Architectural design · Planning consultancy · 3D visualisation & modelling
Vale·Est. 2011
This building contractor, established in 2011, undertakes extensions for both domestic and commercial properties.
From their website
Extensions & Conversions (inferred from the source page)
Also General building · Painting & decorating · Shop & commercial fit-out
St Saviour
A building contractor for domestic and commercial clients; extensions are a key part of its building and renovation work.
Renovations extensions (inferred from the source page)
Also Painting & decorating · Tiling · Guttering, fascia & soffit
St Peter Port·Professional services
An architectural design firm in St Peter Port, home extensions are a key part of its residential design work.
From their website
Home extensions (inferred from the source page)
Also New build & development · Architectural design · Planning consultancy
St Saviour
This City & Guilds qualified building company specialises in extensions and alterations, alongside new builds and renovations.
From their website
Extensions and alterations
Also Roofing (general) · General building · Plastering
St Martin
A family-run building company in St Martin, residential extensions are a primary service alongside new builds and renovations.
Renovations extensions (inferred from the source page)
Also General building · Bricklaying & blockwork · Kitchen fitting
Vale
A carpentry and joinery sole trader, this business undertakes house extensions as a significant part of its building work.
From their website
Extensions & Loft Conversions
Also Carpentry & joinery (general) · Fitted & bespoke furniture · Decking, fencing & timber structures
St Sampson
A sole-trader builder with 27 years of experience, specialising in house extensions and other residential building work.
From their website
House extensions
Also Coving & cornicing · Rendering · Renovation & refurbishment
St Sampson
A St Sampson builder and carpenter, this business undertakes extensions as part of its general building and renovation services.
Renovations extensions
Also Doors · Carpentry & joinery (general) · General building
St Peter Port
✦1924 centenary firm
Built Island War Memorial 1926
A family-owned building company established in 1924, this firm undertakes extensions as a key part of its construction services.
Vale·Est. 2005
A Guernsey construction company specialising in residential extensions, alongside new builds, refurbishments, and groundworks.
Pricing & termsResidential
ServicesHouse extensions
Also New build & development · Renovation & refurbishment · Groundworks & foundations
St Sampson·Est. 1980
This architectural practice, established in 1980, undertakes extensions for various property types as a key part of its work.
St Saviour·Est. 1990
This Guernsey construction company undertakes extensions for both domestic and commercial clients, alongside new builds and renovations.
St Peter Port·Professional services·Est. 2012
An RIBA-registered architectural practice with a St Peter Port studio, designing extensions for residential and commercial properties.
St Peter Port·Professional services
This architectural technologist service in St Peter Port provides design and planning for residential and commercial extensions.
Forest
This Guernsey construction contractor undertakes extensions, new builds, and renovations as key parts of its building work.
St Martin·Construction firm
This building contractor specialises in extensions for both residential and commercial properties, alongside new builds and renovations.
Vale
This Vale-based general builder undertakes residential and commercial extensions, alongside new builds and timber frame construction.
St Martin·Professional services
A Chartered Architectural Technologist practice in St Martin, specialising in design and construction services for property extensions.
St Peter Port
This building contractor specialises in extensions for both residential and commercial properties, alongside new builds and renovations.
St Saviour
This building contractor specialises in residential extensions, alongside new builds and renovations for Guernsey properties.
St Pierre du Bois·Est. 2011
A St Pierre du Bois construction firm, established in 2011, specialising in extensions alongside new builds and renovations.
St Peter Port
This construction company undertakes residential and commercial extensions, alongside renovations and new builds, with all trades handled in-house.
Vale·Construction firm·Est. 1952
This building contractor, primarily focused on carpentry, undertakes building extensions for residential and commercial clients.
Renovations extensions (inferred from the source page)
Also Flooring · Carpentry & joinery (general) · 2nd-fix carpentry & trim
St Sampson
✦1924 centenary firm
Family-owned across four generations
This family-owned construction company, established in 1924, undertakes domestic extensions as part of its building services.
From their website
Domestic extensions
Also General building · Renovation & refurbishment · Carpentry & joinery (general)
Castel·Professional services·Est. 1996
This chartered architectural technologist and surveyor practice offers design and project management for building extensions.
From their website
Extensions
Also Architectural design · Architectural project management · Renovation & refurbishment
St Peter Port·Professional services·Est. 2011
An architectural practice that includes extensions and renovations among its residential and commercial design services.
From their website
New build homes
Also Architecture · Sustainable & accessible design · Interior design
St Andrew·Est. 1988
St Andrew property development and contracting firm with a team of 25, specialising in high-end development, general contract works, and timber frame design and construction.
From their website
Renovations and extensions (inferred from the source page)
Vale
A building services firm that undertakes extensions, alongside general building, carpentry, and renovation projects.
Renovations extensions
Also Painting & decorating · General building · Roofing (general)
St Peter Port·Professional services
RIBA Chartered architecture and design practice offering design solutions for residential, commercial, and community projects in St Peter Port.
From their website
home extensions
Also Architectural design · Interior design · Planning consultancy
St Saviour·Est. 2010
GBTEA member with City and Guilds qualifications and 27 years of experience in carpentry and construction in St Saviour.
From their website
Residential renovations and extensions (inferred from the source page)
Also Renovation & refurbishment · Carpentry & joinery (general) · Roofing (general)
St Sampson
General building contractor in St Sampson with over 42 years of experience in new builds, renovations, extensions, alterations, driveways, and patios.
From their website
Extensions (inferred from the source page)
St Martin·Est. 2012
Surefire Pools & Construction, established in 2012, offers extensions as part of its general building services.
St Martin·Est. 2009
This St Martin-based CIOB-chartered building company undertakes extensions as part of its residential and commercial construction work.
St Andrew
This residential renovations and building contractor in St Andrew undertakes extensions as part of its building services.
Vale
This carpentry and construction sole trader undertakes house extensions and loft conversions as part of its general building work.
St Andrew
A plumbing and heating company that also undertakes extensions as part of its broader construction-related services.
Other capabilities nearby in the graph — the count is how many businesses do each.