Westhoughton house extensions
Planning an extension in Westhoughton? Compare extension types, see guide prices adjusted for Westhoughton and book a free site visit.
- Postcode districtsBL5, M46
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Guide prices for Westhoughton
We publish guide prices so you can budget before anyone visits. For Westhoughton they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
Planning and building control in Westhoughton
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 extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
What works best for Westhoughton houses?
The North West has a high share of Victorian and Edwardian terraces with rear yards and outriggers, plus large areas of inter-war semis in the suburbs.
Start by comparing double-storey extensions, kitchen extensions and single-storey rear extensions: between them they cover most of the layouts we see requested for houses like these.
Westhoughton and surrounding towns
We cover Westhoughton and the postcode districts BL5, M46. We also work in nearby Atherton (2 miles), Hindley (3 miles), Tyldesley (3 miles), Leigh (4 miles), Horwich (4 miles). Golborne, in Merseyside, is roughly 6 miles from Westhoughton and also on our list.
Choose an extension type
- Orangery extensions · from £28,500
- Side return extensions · from £17,000
- Home office extensions · from £15,000
- Pitched roof extensions · from £21,000
- Porch extensions · from £3,800
- Kitchen extensions · from £25,500
- Utility and boot room extensions · from £13,000
- Extensions over a garage · from £22,500
- Bedroom extensions · from £24,500
- Side extensions · from £20,500
- Glass box extensions · from £28,500
- Double-storey extensions · from £36,000
- Extension plans and drawings · from £1,100
- Bungalow extensions · from £24,500
- Wraparound extensions · from £34,000
- Timber frame extensions · from £19,500
- Planning permission for extensions · from £300
- Building regulations for extensions · from £850
- Conservatory replacement extensions · from £19,000
- Flat roof extensions · from £19,500
- Single-storey rear extensions · from £19,500
- Annexe extensions · from £52,000
Free site visit
We visit your Westhoughton home, measure up, talk through what you want and check the planning position.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
Fixed written price
The price is fixed in writing once the design is settled, with a clear programme and payment stages.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Westhoughton
How much does an extension cost in Westhoughton?
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.
How long does an extension take in Westhoughton?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Westhoughton, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you cover all of Westhoughton?
Yes, including the surrounding parts of Greater Manchester. Site visits are free and there is no obligation.
Book a free site visit in Westhoughton
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.