GS Renovation designs and builds extensions across Westminster, working with the grand stucco terraces, period mansion blocks and prestigious townhouses of Mayfair, Pimlico and Paddington. With more than 30 years in W1, W2, SW1, WC2, NW8 and W9, we handle groundworks, steel, roofing and full fit-out on properties that are often listed or within a conservation area.
Rear and side-return extensions in Westminster
Westminster plots are tight and precious, so extensions here tend to reclaim every usable inch. On the Georgian and Victorian houses around Marylebone and Paddington, a rear closet wing and side return often become a single open kitchen-diner, carried on a steel beam and built off new foundations dug to suit the ground and any neighbouring structures. We survey drains, party walls and existing footings before a spade goes in.
Whether your project is permitted development or needs a full planning application depends entirely on the property. Listed buildings and conservation areas across SW1 and W1 usually rule out permitted development, meaning an application to Westminster City Council. We advise honestly on which route applies, so you know the planning position before committing to a design.
Planning and party walls in Westminster
Because so much of Westminster is protected, extension design is a conversation with the council as much as an engineering task. We prepare schemes that respect the stucco frontages, mansion-block symmetry and roofscapes the borough guards closely, and we manage the planning application and, where relevant, listed building consent alongside the building regulations submission for the structural work.
Party wall matters are almost unavoidable here. New foundations near a boundary and beams bearing onto shared walls trigger notices under the Party Wall Act, and mansion-flat extensions in NW8 or W9 need the freeholder's licence to alter. We coordinate neighbours, freeholders and managing agents, then deliver the full build, from groundworks and steel through to roof, glazing and a complete interior fit-out.
- Single and double storey extensions
- Wrap-around extensions and infills
- Scaffolding, site set-up and safe access on tight London plots
- Full fit-out, finishing and making good
- Insulation, airtightness and thermal detailing to regulations
Why Westminster Homeowners Choose GS Renovation
Homeowners across Westminster choose GS Renovation because an extension on a listed or conservation-area property demands more than a builder. We manage the planning application to the council, engineer-designed steel and building control, then build the lot in-house. Thirty years across W1, SW1 and NW8 means we know what this borough will and will not allow.
- Free, no-obligation quotations
- Honest updates if a date or a detail has to move
- Drainage diverted or built over with the right approval in place
- Insulation and thermal detailing to current regulations
- Clean, tidy and reliable tradespeople
- Photographs kept at each stage for your records