Home extensions in Buckinghamshire
Looking to extend your home in Buckinghamshire? Start here: extension types, guide prices for Buckinghamshire, the planning rules that apply and how a project runs.
- Towns listed9
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts43
Towns we cover in Buckinghamshire
Towns we cover here include Milton Keynes, High Wycombe, Aylesbury, Bletchley.
Popular extension prices in Buckinghamshire
Prices on this page use our South East England factor of ×1.12, 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) |
|---|---|---|
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
Approvals for an extension in Buckinghamshire
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 Buckinghamshire home?
Homes across the South East range from Victorian terraces in the older town centres to large detached houses on the edges, so the right extension type varies street by street.
The types we would usually look at first for a home in Buckinghamshire are double-storey extensions, wraparound extensions and orangery extensions, depending on the garden and how the house is laid out.
All extension types we build in Buckinghamshire
- Home office extensions · from £17,500
- Annexe extensions · from £61,500
- Flat roof extensions · from £23,500
- Side extensions · from £24,500
- Timber frame extensions · from £23,500
- Porch extensions · from £4,450
- Utility and boot room extensions · from £15,500
- Double-storey extensions · from £42,500
- Extensions over a garage · from £26,500
- Glass box extensions · from £33,500
- Bungalow extensions · from £29,000
- Pitched roof extensions · from £24,500
- Orangery extensions · from £33,500
- Planning permission for extensions · from £350
- Wraparound extensions · from £40,000
- Kitchen extensions · from £30,000
- Single-storey rear extensions · from £23,500
- Bedroom extensions · from £29,000
- Building regulations for extensions · from £1,000
- Conservatory replacement extensions · from £22,000
- Extension plans and drawings · from £1,300
- Side return extensions · from £20,000
Neighbouring areas
Questions about extensions in Buckinghamshire
How much does an extension cost in Buckinghamshire?
With our South East England factor (×1.12), a standard-spec 20 m² single-storey extension is a guide £45,500 to £58,500 including VAT. Prices for every type are linked on this page.
How long does an extension take in Buckinghamshire?
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.
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.
Book a free site visit in Buckinghamshire
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.