Extending your home in Leigh
More space without moving: we plan and build extensions across Leigh, with one team for the drawings, the council and the build.
- Postcode districtsM29, M46, WN7
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in Leigh
Prices on this page use our North West England factor of ×0.95, include VAT at 20% and cover the build; your written price follows a survey and agreed drawings.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
Planning rules in Leigh
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.
Building regulations approval is separate from planning. In England you can use the council's building control team or a registered building control approver; a full plans application gets the drawings checked before work starts, and the inspector signs the work off with a completion certificate.
Applications are decided by the local planning authority (your district, borough or unitary council).
Leigh and surrounding towns
We cover Leigh and the postcode districts M29, M46, WN7. Nearby, we also take on projects in Atherton (2 miles), Tyldesley (2 miles), Westhoughton (4 miles), Hindley (4 miles), Walkden (5 miles). For homes towards Merseyside, Golborne is around 3 miles away.
What works best for Leigh houses?
Across the North West, terraced houses with small rear yards suit compact rear and side return extensions, while suburban semis have room for more.
For many houses here, side return extensions, single-storey rear extensions or double-storey extensions gives the most useful space for the budget.
All extension types we build in Leigh
- Side return extensions · from £17,000
- Extension plans and drawings · from £1,100
- Annexe extensions · from £52,000
- Orangery extensions · from £28,500
- Double-storey extensions · from £36,000
- Porch extensions · from £3,800
- Bedroom extensions · from £24,500
- Bungalow extensions · from £24,500
- Side extensions · from £20,500
- Kitchen extensions · from £25,500
- Building regulations for extensions · from £850
- Timber frame extensions · from £19,500
- Utility and boot room extensions · from £13,000
- Home office extensions · from £15,000
- Conservatory replacement extensions · from £19,000
- Glass box extensions · from £28,500
- Wraparound extensions · from £34,000
- Pitched roof extensions · from £21,000
- Flat roof extensions · from £19,500
- Planning permission for extensions · from £300
- Extensions over a garage · from £22,500
- Single-storey rear extensions · from £19,500
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in Leigh
How much does an extension cost in Leigh?
Using our North West England factor (×0.95), a standard-spec single-storey extension of 20 m² is a guide £38,500 to £49,500 including VAT, and a 32 m² two-storey extension £54,500 to £71,500. Your written price follows the survey.
Do I need planning permission for an extension in Leigh?
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.
Do you cover all of Leigh?
Yes, including the surrounding parts of Greater Manchester. Site visits are free and there is no obligation.
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.
Book a free site visit in Leigh
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.