Extensions

Moving house in South West London is expensive, disruptive, and uncertain. Stamp duty, estate agent fees, legal costs, and the sheer upheaval of moving can easily exceed six figures. Extending your existing home done properly gives you the additional space you need without any of that. And in areas like Cobham, Weybridge, and Wimbledon, a well-designed extension doesn't just add space; it adds real, lasting value.

InstaFlame has been building home extensions across Wimbledon, Cobham, Weybridge, Chelsea, Putney, Fulham, Epsom, and Kingston for many years. We manage every element of the project design, planning, structural work, build, and interior fit-out as one coordinated team. Whether you're looking to create a large open-plan kitchen-diner, add a ground floor bedroom, build a double-storey addition, or maximise a side return we design something that looks like it was always part of the house, not an afterthought bolted on.

Q: Do I need planning permission for an extension?

A: Many single-storey extensions can be built under permitted development rights without a full planning application. Size limits apply, and conservation areas — including parts of Wimbledon, Chelsea, and Putney — have additional restrictions. We'll assess your property and advise on the most efficient route.

Q: How much does a home extension cost?

A: Extension costs vary widely based on size, complexity, and specification. Single-storey extensions in our areas typically start from £40,000, with double-storey projects from £50,000 upwards. We provide a full itemised quote after a site visit.

Q: How long will my extension take to build?

A: A single-storey extension typically takes 8–16 weeks from start of construction. Planning and building regulations approval can add time before that. We give every client a clear, realistic timeline and provide regular progress updates throughout.

Q: Do you build in conservation areas?

A: Yes. Many of our projects are in conservation areas across Wimbledon, Chelsea, and Putney. We have extensive experience working within these constraints to achieve designs that satisfy planning requirements without compromising quality.

Single Storey Extension

A single storey house extension is a ground-floor addition that expands a house outward on one level.

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Double Storey Extension

It is one of the most cost-effective ways to scale up a home, as it delivers double the square footage of a single-storey build without requiring twice the groundwork or roofing costs.

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