Extending in Marylebone is different from extending a suburban house, and GS Renovation has spent more than 30 years working within those limits. The area's red-brick mansion blocks and purpose-built period flats in W1 offer little room to build outward, so most projects reconfigure and enhance the existing footprint rather than add to it.
What extending means in Marylebone W1
Permitted development rights that let owners of houses add rear or side-return extensions rarely apply to a Marylebone flat, and much of the area sits within conservation controls under Westminster City Council. That means external alterations, roof changes or anything affecting the appearance of a period block will almost always need planning permission, and listed buildings need listed building consent on top of it.
For most leaseholders the realistic gain is internal. We create the sense of an extension by opening up dividing walls, absorbing under-used space and reworking tired layouts, all sized by an engineer and signed off under building regulations. Where a genuine addition is possible, such as a mansard or a rear infill on a house, we handle the planning application to the council from the start.
Foundations, steel and fit-out near Hyde Park
When a scheme does involve building work, whether a lower-ground rear infill on a townhouse near Hyde Park or a roof addition, we cover the whole sequence. That means groundworks and foundations designed for the tight, built-up plots typical of central London, steel beams to carry new openings, roof and weathering works, and a full fit-out with plastering, electrics, plumbing and decoration.
Access and logistics shape every W1 job. There is no wide driveway to store materials, deliveries have to thread through busy streets near Oxford Street and the West End, and party structures are shared with neighbours. We plan skips, scaffolding and deliveries around those constraints, serve any party wall notices, and keep the freeholder and managing agent updated throughout the build.
- Architectural drawings and structural coordination
- Single and double storey extensions
- Side-return and rear extensions
- Wrap-around extensions and infills
- Loft conversions and roof works
Why Choose GS Renovation in Marylebone
GS Renovation is honest from day one about what a Marylebone property can and cannot support, which saves owners wasted time and fees. We know when a scheme needs planning permission from Westminster versus building regulations alone, we handle party wall and freeholder consents, and our 30+ years in central London mean we build cleanly on constrained W1 plots.
- Free, no-obligation quotations
- Over 30 years of hands-on experience
- Dedicated project management
- Fully insured and guaranteed work
- Building control and planning support
- Clean, tidy and reliable tradespeople