Lancaster house extensions
More space without moving: we plan and build extensions across Lancaster, with one team for the drawings, the council and the build.
- Postcode districtsLA1, LA4
- Price regionNorth West England (×0.95)
- Planning rulesEngland
- Site visitFree, no obligation
Popular extension prices in Lancaster
We publish guide prices so you can budget before anyone visits. For Lancaster they are adjusted by ×0.95, the factor we use across North West England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Orangery extensions | 16 m² | £42,500 – £53,500 |
| 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 |
| Extensions over a garage | 12 m² | £23,500 – £31,000 |
| Double-storey extensions | 32 m² | £54,500 – £71,500 |
| Side return extensions | 11 m² | £25,000 – £31,500 |
Choosing the right extension in Lancaster
Across the North West, terraced houses with small rear yards suit compact rear and side return extensions, while suburban semis have room for more.
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.
Approvals for an extension in Lancaster
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 single-storey side extension can be permitted development if it is no more than 4 m high and no wider than half the width of the original house. Two-storey side extensions, and any side extension on designated land such as a conservation area, need a householder planning application.
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).
Covering Lancaster and nearby
Postcode districts we cover around Lancaster include LA1, LA4. The same team covers Morecambe (3 miles), Fleetwood (12 miles), Thornton-Cleveleys (15 miles), Poulton-le-Fylde (17 miles), Blackpool (19 miles), all within easy reach. Ulverston, in Cumbria, is roughly 16 miles from Lancaster and also on our list.
All extension types we build in Lancaster
- Planning permission for extensions · from £300
- Orangery extensions · from £28,500
- Extensions over a garage · from £22,500
- Single-storey rear extensions · from £19,500
- Annexe extensions · from £52,000
- Wraparound extensions · from £34,000
- Flat roof extensions · from £19,500
- Pitched roof extensions · from £21,000
- Side extensions · from £20,500
- Timber frame extensions · from £19,500
- Building regulations for extensions · from £850
- Bedroom extensions · from £24,500
- Extension plans and drawings · from £1,100
- Bungalow extensions · from £24,500
- Home office extensions · from £15,000
- Kitchen extensions · from £25,500
- Conservatory replacement extensions · from £19,000
- Double-storey extensions · from £36,000
- Side return extensions · from £17,000
- Porch extensions · from £3,800
- Glass box extensions · from £28,500
- Utility and boot room extensions · from £13,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
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
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Lancaster
How much does an extension cost in Lancaster?
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.
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.
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 Lancaster?
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 Lancaster?
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 Lancaster
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.