Rawtenstall house extensions
We design and build house extensions for homes in Rawtenstall and the surrounding Lancashire area, with guide prices adjusted for the region.
- Postcode districtsBB4
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Planning rules in Rawtenstall
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).
Which extension suits a Rawtenstall home?
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.
For many houses here, single-storey rear extensions, double-storey extensions or kitchen extensions gives the most useful space for the budget.
Rawtenstall and surrounding towns
Postcode districts we cover around Rawtenstall include BB4. Nearby, we also take on projects in Accrington (5 miles), Burnley (7 miles), Darwen (7 miles), Blackburn (9 miles), Nelson (10 miles). For homes towards Greater Manchester, Bury is around 7 miles away.
Popular extension prices in Rawtenstall
We publish guide prices so you can budget before anyone visits. For Rawtenstall they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| 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 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
Choose an extension type
- Single-storey rear extensions · from £19,500
- Building regulations for extensions · from £850
- Orangery extensions · from £28,500
- Side extensions · from £20,500
- Bungalow extensions · from £24,500
- Annexe extensions · from £52,000
- Wraparound extensions · from £34,000
- Bedroom extensions · from £24,500
- Utility and boot room extensions · from £13,000
- Flat roof extensions · from £19,500
- Planning permission for extensions · from £300
- Home office extensions · from £15,000
- Double-storey extensions · from £36,000
- Kitchen extensions · from £25,500
- Extension plans and drawings · from £1,100
- Glass box extensions · from £28,500
- Porch extensions · from £3,800
- Conservatory replacement extensions · from £19,000
- Side return extensions · from £17,000
- Timber frame extensions · from £19,500
- Pitched roof extensions · from £21,000
- Extensions over a garage · from £22,500
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Rawtenstall
How much does an extension cost in Rawtenstall?
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.
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 Rawtenstall, and the guide-price tool gives a range for your own size and finish in about a minute.
How long does an extension take in Rawtenstall?
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.
Book a free site visit in Rawtenstall
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.