Home extensions in Cumbria
Planning an extension in Cumbria? Compare extension types, see guide prices adjusted for Cumbria and book a free site visit.
- Towns listed7
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Postcode districts45
Towns we cover in Cumbria
Towns we cover here include Carlisle, Barrow-in-Furness, Kendal, Whitehaven.
What extensions cost in Cumbria
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) |
|---|---|---|
| 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 |
| Conservatory replacement extensions | 14 m² | £28,500 – £37,000 |
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| Single-storey rear extensions | 20 m² | £38,500 – £49,500 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
Planning rules in Cumbria
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.
Choosing the right extension in Cumbria
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 single-storey rear extensions, side return extensions and double-storey extensions: between them they cover most of the layouts we see requested for houses like these.
All extension types we build in Cumbria
- Flat roof extensions · from £19,500
- Building regulations for extensions · from £850
- Side extensions · from £20,500
- Bungalow extensions · from £24,500
- Single-storey rear extensions · from £19,500
- Timber frame extensions · from £19,500
- Planning permission for extensions · from £300
- Orangery extensions · from £28,500
- Annexe extensions · from £52,000
- Conservatory replacement extensions · from £19,000
- Pitched roof extensions · from £21,000
- Extensions over a garage · from £22,500
- Side return extensions · from £17,000
- Utility and boot room extensions · from £13,000
- Bedroom extensions · from £24,500
- Glass box extensions · from £28,500
- Kitchen extensions · from £25,500
- Double-storey extensions · from £36,000
- Porch extensions · from £3,800
- Wraparound extensions · from £34,000
- Extension plans and drawings · from £1,100
- Home office extensions · from £15,000
Neighbouring areas
Questions about extensions in Cumbria
How much does an extension cost in Cumbria?
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 Cumbria, and the guide-price tool gives a range for your own size and finish in about a minute.
Do I need planning permission for an extension in Cumbria?
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.
How long does an extension take in Cumbria?
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 Cumbria
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.