House extensions in Lancashire
Looking to extend your home in Lancashire? Start here: extension types, guide prices for Lancashire, the planning rules that apply and how a project runs.
- Towns listed19
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Postcode districts40
Towns we cover in Lancashire
Towns we cover here include Preston, Burnley, Blackburn, Blackpool.
Approvals for an extension in Lancashire
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 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.
Which extension suits a Lancashire 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.
For many houses here, side return extensions, double-storey extensions or single-storey rear extensions gives the most useful space for the budget.
Lancashire extension prices at a glance
We publish guide prices so you can budget before anyone visits. For Lancashire 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 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Wraparound extensions | 25 m² | £54,500 – £69,000 |
Every extension type in Lancashire
- Side extensions · from £20,500
- Utility and boot room extensions · from £13,000
- Glass box extensions · from £28,500
- Porch extensions · from £3,800
- Flat roof extensions · from £19,500
- Planning permission for extensions · from £300
- Single-storey rear extensions · from £19,500
- Extension plans and drawings · from £1,100
- Annexe extensions · from £52,000
- Orangery extensions · from £28,500
- Double-storey extensions · from £36,000
- Bedroom extensions · from £24,500
- Home office extensions · from £15,000
- Bungalow extensions · from £24,500
- Building regulations for extensions · from £850
- Wraparound extensions · from £34,000
- Extensions over a garage · from £22,500
- Side return extensions · from £17,000
- Kitchen extensions · from £25,500
- Conservatory replacement extensions · from £19,000
- Timber frame extensions · from £19,500
- Pitched roof extensions · from £21,000
Neighbouring areas
Questions about extensions in Lancashire
How much does an extension cost in Lancashire?
With our North West England factor (×0.95), a standard-spec 20 m² single-storey extension is a guide £38,500 to £49,500 including VAT. Prices for every type are linked on this page.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Lancashire, 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 Lancashire?
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 I need planning permission for an extension in Lancashire?
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 Lancashire
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.