House extensions in Nelson
Looking to extend your home in Nelson? Start here: extension types, guide prices for Nelson, the planning rules that apply and how a project runs.
- Postcode districtsBB8, BB9
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Approvals for an extension in Nelson
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 two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
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).
Popular extension prices in Nelson
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) |
|---|---|---|
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
Areas we cover around Nelson
Site visits are available across Nelson (BB8, BB9). The same team covers Colne (2 miles), Burnley (3 miles), Accrington (8 miles), Rawtenstall (10 miles), Blackburn (13 miles), all within easy reach. Keighley, in West Yorkshire, is roughly 12 miles from Nelson and also on our list.
Which extension suits a Nelson home?
Across the North West, terraced houses with small rear yards suit compact rear and side return extensions, while suburban semis have room for more.
The types we would usually look at first for a home in Nelson are side return extensions, kitchen extensions and double-storey extensions, depending on the garden and how the house is laid out.
All extension types we build in Nelson
- Timber frame extensions · from £19,500
- Wraparound extensions · from £34,000
- Flat roof extensions · from £19,500
- Kitchen extensions · from £25,500
- Annexe extensions · from £52,000
- Bedroom extensions · from £24,500
- Bungalow extensions · from £24,500
- Building regulations for extensions · from £850
- Conservatory replacement extensions · from £19,000
- Side return extensions · from £17,000
- Utility and boot room extensions · from £13,000
- Orangery extensions · from £28,500
- Single-storey rear extensions · from £19,500
- Glass box extensions · from £28,500
- Double-storey extensions · from £36,000
- Side extensions · from £20,500
- Pitched roof extensions · from £21,000
- Planning permission for extensions · from £300
- Extension plans and drawings · from £1,100
- Porch extensions · from £3,800
- Home office extensions · from £15,000
- Extensions over a garage · from £22,500
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
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 Nelson
How much does an extension cost in Nelson?
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 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 Nelson?
Yes, including the surrounding parts of Lancashire. Site visits are free and there is no obligation.
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.
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.
Book a free site visit in Nelson
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.