Our services
House Extensions
A house extension is one of the most rewarding ways to add living space, light and value to a London home, and it lets you shape the property around the way you actually live. MVV designs and builds rear, side return and wrap-around extensions across South West, West and South East London, handling design, planning and construction as a single, accountable service.
How much does a house extension cost in London?
As a realistic 2026 starting point from our own priced projects, all ex VAT: a single storey rear extension starts at around £80,000 for building the new space itself, which is roughly £2,400 per square metre, and most complete projects come in from around £100,000 once the knock through, finishes and fittings are included. A two storey side return we priced recently, adding around 48 m² of new floor area, came to around £188,000. Pairing an extension with a full refurbishment of the existing house typically lands between £210,000 and £250,000. For new above ground space at a high standard, £2,400 to £2,800 per square metre is a realistic inner London range before professional fees. The rest depends on size, design, specification and the condition of the existing property, which is why the instant estimator prices yours from your own description and sends a realistic range to your inbox in minutes. Figures are indicative, from projects priced in August 2026.
How long a house extension takes
Timescales vary with complexity, but a single-storey extension typically takes around two to three months on site once planning is in place and the design is agreed.
Planning permission
Most house extensions need planning permission, though some fall under permitted development depending on the borough. We manage the application for you and submit the documentation your local authority requires, keeping the approval process smooth.
Choosing the right design
Our designers work closely with you so the extension feels like a natural part of the house rather than an addition. Whether it is a rear kitchen extension, a side return or a wrap-around, we shape the space around how you live and how the light falls.
Adding value to your property
A well-designed house extension can significantly increase what your home is worth. Adding usable space, especially an open-plan kitchen or an extra bedroom, is among the most appealing improvements to future buyers in London.
A full design and build service
We deliver house extensions as a complete design and build service in London, from first concept and planning through construction to final finishes, so one team is accountable for the whole project.
House Extensions across London
- Fulham
- Chelsea
- Notting Hill
- Chiswick
- Wimbledon
- Pimlico
- Belsize Park
- Hampstead
- Mayfair
- Marylebone
- Blackheath
- Borough
- Kensington
- Streatham
- St John's Wood
- Maida Vale
- Little Venice
- Regent's Park
- Primrose Hill
- West Hampstead
- Fitzrovia
- Bloomsbury
- Covent Garden
- Soho
- St James's
- Westminster
- Belgravia
- Knightsbridge
- Bayswater
- Paddington
- Clerkenwell
- Holland Park
- South Kensington
- Earl's Court
- Sevenoaks
Thinking about house extensions? Get a realistic number in minutes.
Instant estimateRelated projects
Where this work comes to life
A selection of completed MVV projects delivered with this service.
