Extending your home in Acton
Every type of house extension in Acton, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsTW8, W3, W4, W5, W12, W13
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
What works best for Acton houses?
Across London, terraced houses with narrow side returns and tight access are the norm, which shapes everything from party wall notices to how materials reach the back garden.
Start by comparing wraparound extensions, kitchen extensions and side return extensions: between them they cover most of the layouts we see requested for houses like these.
Acton extension prices at a glance
Every figure below is a guide for Acton, adjusted for London build costs (×1.3) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Conservatory replacement extensions | 14 m² | £39,000 – £50,500 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
Planning and building control in Acton
In England a single-storey rear extension can usually go up to 3 m beyond the original rear wall of a semi-detached or terraced house, or 4 m on a detached house, without a planning application, provided it is no more than 4 m high, keeps eaves to 3 m within 2 m of a boundary and, with other buildings, covers no more than half the land around the original house. The larger home extension prior approval scheme raises those depths to 6 m and 8 m, with neighbours notified and a 42-day decision.
In England a single-storey side return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
In a conservation area, national park, National Landscape, the Broads or a World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Areas we cover around Acton
We cover Acton and the postcode districts TW8, W3, W4, W5, W12, W13. The same team covers Chiswick (1 mile), Harlesden (2 miles), Shepherds Bush (2 miles), Willesden (2 miles), Barnes (3 miles), all within easy reach. For homes towards Surrey, East Molesey is around 8 miles away.
Extension types and starting prices
- Side return extensions · from £23,000
- Wraparound extensions · from £46,500
- Glass box extensions · from £39,000
- Timber frame extensions · from £27,000
- Home office extensions · from £20,500
- Annexe extensions · from £71,500
- Kitchen extensions · from £35,000
- Building regulations for extensions · from £1,150
- Bungalow extensions · from £34,000
- Conservatory replacement extensions · from £26,000
- Single-storey rear extensions · from £27,000
- Side extensions · from £28,500
- Porch extensions · from £5,200
- Extension plans and drawings · from £1,550
- Orangery extensions · from £39,000
- Bedroom extensions · from £33,500
- Planning permission for extensions · from £450
- Double-storey extensions · from £49,000
- Pitched roof extensions · from £28,500
- Extensions over a garage · from £31,000
- Utility and boot room extensions · from £18,000
- Flat roof extensions · from £27,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
We build it with one project manager, book the building control inspections and hand over the completion certificate.
Questions about extensions in Acton
How much does an extension cost in Acton?
Using our London factor (×1.3), a standard-spec single-storey extension of 20 m² is a guide £53,000 to £68,000 including VAT, and a 32 m² two-storey extension £74,500 to £98,000. Your written price follows the survey.
Do you cover all of Acton?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Acton, and the guide-price tool gives a range for your own size and finish in about a minute.
Who do I contract with?
Your contract is with S&K Property Investments and Improvement Ltd, which designs and manages the project and the build teams who carry it out.
Do I need planning permission for an extension in Acton?
Not always. It depends on the size, position and your property's history. Many single-storey rear extensions in England are permitted development or can use prior approval.
Book a free site visit in Acton
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.