Two-storey wraparound extensions in Clapham
For a two-storey wraparound extension in Clapham, the first questions are always the same: how big, which approvals, and what it will cost. This page answers all three for Greater London.
Before you start in Clapham, here's what applies.
- Postcode districts
- SW4
- County / area
- Greater London, England
- Price region
- London
- Guide price
- £144,500–£198,000 (£2,580–£3,540 per m²)
- Approval route
- Planning permission is needed: the side part takes it outside permitted development in England.
- Nearest towns
- Brixton Hill (0.9 miles), Balham (1 mile), Battersea (1.2 miles)
- First visit
- Free, no obligation
About a two-storey wraparound extension
A two-storey wraparound extension is an L-shaped addition that extends both the side and the rear of your house, on two floors. It gives one of the largest gains in floor space of any extension, typically a big open-plan kitchen and living area below and two or more bedrooms or bathrooms above. In England it needs planning permission, because the side part is more than one storey.
We cover postcode district SW4 in and around Clapham, along with neighbouring Brixton Hill, Balham and Battersea.
What it costs in Clapham
Using our London rates, a two-storey wraparound extension with an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space) comes to about £144,500–£198,000, including VAT. Bigger or more glazed designs cost more per m². These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.
| Spec | Per m² | An L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space) |
|---|---|---|
| Essential | £2,370–£3,260 per m² | £133,000–£182,500 |
| Standard | £2,580–£3,540 per m² | £144,500–£198,000 |
| Premium | £3,100–£4,250 per m² | £173,500–£238,000 |
Planning and building regulations in Clapham
In England, a two-storey wraparound extension needs householder planning permission, because any extension beyond a side wall must be single storey to be permitted development. The application costs £548 (or £575 for applications made from 8 December 2026). Councils weigh the side part against the street scene and the rear part against neighbours' light and outlook, and should decide within 8 weeks of validation.
Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.
Design points for Clapham homes
Daylight to the middle
A deep L-shaped plan can leave the middle of the ground floor dark, because the old rear rooms are now enclosed. We use wide rear openings, a well-placed stair and, where part of the extension is single storey, roof lights, while keeping total glazing within the Part L allowance.
Two roofs that meet
A wraparound needs the side roof and rear roof to join cleanly, often with a valley or hip where they meet. Getting pitches and ridge heights right keeps rainwater moving and avoids a bulky mass at the back corner, which neighbours and planners notice.
How we'd run your project
Visit and first ideas
One of our team visits your house in Clapham, checks the walls, roof and drains, and sketches out options with you.
Plans, then approval
Measured survey, design, then the right approval route for your house. We explain each step before we take it.
Detail and price
Construction drawings, engineer's calculations and building control sign-off, then a written fixed price for the build.
Finish and certify
Second fix, plastering and making good, then building control's final inspection and the completion paperwork.
Questions about two-storey wraparound extensions in Clapham
Do I need planning permission for a two-storey wraparound extension in Clapham?
Clapham is in England, so England planning rules apply. Planning permission is needed: the side part takes it outside permitted development in England. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
Which postcodes do you cover around Clapham?
We cover Clapham (SW4) and nearby places including Brixton Hill, Balham and Battersea, plus the rest of Greater London. The first site visit is free.
How much does a two-storey wraparound extension cost in Clapham?
Our guide for London, which covers Clapham, is £2,580–£3,540 per m² including VAT. A typical project with an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space) comes to about £144,500–£198,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
How much floor space does a wraparound extension add?
It depends on the width of the side plot and the depth at the rear. Our guide prices are based on a typical wraparound with an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space). Yours may be larger or smaller, and the measured survey shows what your plot can take.
Can a wraparound extension be part single, part two-storey?
Yes. Many wraparounds keep the rear part single storey with roof lights over the kitchen and put the two-storey part to the side. This can reduce the effect on neighbours and the cost. We set out both options at the design stage, so you can compare floor space against price before choosing.
Nearby
Other towns near Clapham:
Other extensions in Clapham
- Rear
- Side
- Part two-storey
- Over a garage
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Clapham · Two-storey wraparound extensions across Greater London
Ready to talk it through? Call us or send the form and we'll arrange a visit to your home in Clapham.