House extensions in Burnley
Every type of house extension in Burnley, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsBB8, BB9, BB10, BB11, BB12
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Guide prices for Burnley
We publish guide prices so you can budget before anyone visits. For Burnley they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Kitchen extensions | 20 m² | £39,500 – £50,500 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
Covering Burnley and nearby
Our survey diary covers Burnley, including BB8, BB9, BB10, BB11, BB12. The same team covers Nelson (3 miles), Colne (5 miles), Accrington (6 miles), Rawtenstall (7 miles), Blackburn (11 miles), all within easy reach. Just over the Greater Manchester border, Rochdale is about 13 miles away.
Approvals for an extension in Burnley
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).
What works best for Burnley 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.
Depending on the plot, double-storey extensions and kitchen extensions are often the strongest options, with side return extensions worth considering where there is room.
Extension types and starting prices
- Single-storey rear extensions · from £19,500
- Annexe extensions · from £52,000
- Timber frame extensions · from £19,500
- Utility and boot room extensions · from £13,000
- Extensions over a garage · from £22,500
- Double-storey extensions · from £36,000
- Orangery extensions · from £28,500
- Porch extensions · from £3,800
- Side return extensions · from £17,000
- Planning permission for extensions · from £300
- Kitchen extensions · from £25,500
- Home office extensions · from £15,000
- Flat roof extensions · from £19,500
- Bedroom extensions · from £24,500
- Glass box extensions · from £28,500
- Wraparound extensions · from £34,000
- Extension plans and drawings · from £1,100
- Bungalow extensions · from £24,500
- Building regulations for extensions · from £850
- Conservatory replacement extensions · from £19,000
- Pitched roof extensions · from £21,000
- Side extensions · from £20,500
Free site visit
We visit your Burnley 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 Burnley
How much does an extension cost in Burnley?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Burnley, 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 Burnley?
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.
Do you cover all of Burnley?
Yes, including the surrounding parts of Lancashire. Site visits are free and there is no obligation.
Do I need planning permission for an extension in Burnley?
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.
Book a free site visit in Burnley
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.