Home extensions in Southall
From a small utility to a two-storey addition, we take on house extensions throughout Southall, starting with a free visit and a planning check.
- Postcode districtsTW5, UB1, UB2, UB3, UB4, W7
- Price regionLondon (×1.3)
- Planning rulesEngland
- Site visitFree, no obligation
Planning and building control in Southall
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).
What works best for Southall houses?
In London, space is at a premium and gardens are often short, so side returns, wraparounds and carefully planned rear extensions tend to make the most of every metre.
Start by comparing side return extensions, kitchen extensions and wraparound extensions: between them they cover most of the layouts we see requested for houses like these.
Guide prices for Southall
Use these Southall guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Side return extensions | 11 m² | £34,000 – £43,000 |
| Double-storey extensions | 32 m² | £74,500 – £98,000 |
| Wraparound extensions | 25 m² | £74,500 – £94,500 |
| Kitchen extensions | 20 m² | £54,500 – £69,000 |
| Extensions over a garage | 12 m² | £32,500 – £42,500 |
| Single-storey rear extensions | 20 m² | £53,000 – £68,000 |
| Orangery extensions | 16 m² | £58,000 – £73,000 |
Southall and surrounding towns
Our survey diary covers Southall, including TW5, UB1, UB2, UB3, UB4, W7. We also work in nearby Greenford (2 miles), Heston (2 miles), Hayes (Hillingdon) (2 miles), Isleworth (3 miles), Northolt (3 miles). Just over the Surrey border, Ashford, Surrey is about 7 miles away.
Every extension type in Southall
- Pitched roof extensions · from £28,500
- Glass box extensions · from £39,000
- Bedroom extensions · from £33,500
- Orangery extensions · from £39,000
- Double-storey extensions · from £49,000
- Wraparound extensions · from £46,500
- Extensions over a garage · from £31,000
- Home office extensions · from £20,500
- Extension plans and drawings · from £1,550
- Kitchen extensions · from £35,000
- Bungalow extensions · from £34,000
- Flat roof extensions · from £27,000
- Utility and boot room extensions · from £18,000
- Conservatory replacement extensions · from £26,000
- Side return extensions · from £23,000
- Annexe extensions · from £71,500
- Timber frame extensions · from £27,000
- Building regulations for extensions · from £1,150
- Planning permission for extensions · from £450
- Side extensions · from £28,500
- Single-storey rear extensions · from £27,000
- Porch extensions · from £5,200
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
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Southall
How much does an extension cost in Southall?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Southall, and the guide-price tool gives a range for your own size and finish in about a minute.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do you cover all of Southall?
Yes, including the surrounding parts of Greater London. Site visits are free and there is no obligation.
Book a free site visit in Southall
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.