House Extensions in London & Surrey
Expand your living space with precision craftsmanship and modern design
At No1 London, we specialise in premium house extensions in London and Surrey — creating modern, functional spaces that add real value to your home. From kitchen extensions to double-storey builds and structural refurbishments, our team manages every stage with precision craftsmanship and seamless project coordination.
info@no1london.co.uk | 0207 889 09 09
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Why choose No1 London
- Complete start-to-finish service – from design and planning to full build and interior finish.
- In-house manufacturing – bespoke furniture, glass, and joinery made to fit your new space.
- Certified specialists – Gas Safe & NICEIC approved for all plumbing, heating & electrical works.
- Seamless project management – one team coordinating every trade and detail.
- Local experience – trusted by homeowners across West & Central London and Surrey.
Types of Extensions We Build
Rear Extensions
Ideal for extending kitchens and living areas while opening your home to the garden. We design bright, open spaces featuring large glass doors, rooflights, and custom finishes that blend naturally with your existing structure.
Double-Storey Extensions
Maximise space vertically with additional bedrooms, bathrooms, or home offices. Our structural team ensures strength, efficiency, and continuity in design — from matching brickwork to interior finishes.
Side Return Extensions
Perfect for period homes with unused alleyways. We transform narrow side areas into stylish open-plan kitchens or dining spaces, fitted with bespoke furniture and feature glazing.
Wrap-Around Extensions
Combine rear and side structures to completely reinvent your home layout. We manage all planning permissions, structural calculations, and interior design to create a seamless extension that feels like it’s always been part of the house.
What's Included
- Architectural & structural design coordination
- Groundworks & foundations
- Brickwork, insulation, roofing & waterproofing
- Plumbing, heating, electrical & ventilation
- Windows, doors, glass roofs & skylights
- Plastering, painting, flooring & decoration
- Bespoke furniture, kitchens & fitted joinery
Everything is handled by No1 London’s in-house specialists, ensuring smooth communication, consistent quality, and reliable timeframes.
How We Work
Free Consultation & Site Survey
discuss ideas, layouts, and planning considerations
Design & Specification
our designers prepare drawings, finishes, and a clear cost breakdown.
Construction Phase
we manage foundations, structure, and utilities with precision.
Finishing Touches
painting, flooring, and installation of bespoke furniture and glass.
Handover & Aftercare
detailed quality check, cleaning, and long-term support.
Service Areas
We build extensions across Fulham, Chelsea, Kensington, Hammersmith, Putney, Wimbledon, Chiswick, Westminster, the City, and Surrey — bringing practical experience and refined craftsmanship to every home.
Ready to Transform Your Home?
Whether it’s a light-filled kitchen extension, a new bedroom above, or a complete wrap-around transformation — No1 London delivers spaces that look beautiful, perform flawlessly, and last for decades.
Get Free Estimate today and see why we’re the No1 Stop for all your home needs.
Ready to Transform Your Home?
