Extending your home in Oxfordshire
Every type of house extension in Oxfordshire, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Towns listed10
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts30
Towns we cover in Oxfordshire
Towns we cover here include Oxford, Banbury, Abingdon, Bicester.
Do extensions in Oxfordshire need planning permission?
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 Oxfordshire home?
The South East has a broad mix of 1930s semis, post-war estates, newer developments and period cottages, and many houses have enough garden for a generous rear extension.
The types we would usually look at first for a home in Oxfordshire are wraparound extensions, double-storey extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Guide prices for Oxfordshire
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) |
|---|---|---|
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
Extension types and starting prices
- Building regulations for extensions · from £1,000
- Planning permission for extensions · from £350
- Kitchen extensions · from £30,000
- Glass box extensions · from £33,500
- Pitched roof extensions · from £24,500
- Conservatory replacement extensions · from £22,000
- Extensions over a garage · from £26,500
- Side return extensions · from £20,000
- Timber frame extensions · from £23,500
- Bedroom extensions · from £29,000
- Flat roof extensions · from £23,500
- Wraparound extensions · from £40,000
- Porch extensions · from £4,450
- Utility and boot room extensions · from £15,500
- Orangery extensions · from £33,500
- Bungalow extensions · from £29,000
- Home office extensions · from £17,500
- Double-storey extensions · from £42,500
- Side extensions · from £24,500
- Annexe extensions · from £61,500
- Single-storey rear extensions · from £23,500
- Extension plans and drawings · from £1,300
Neighbouring areas
Questions about extensions in Oxfordshire
How much does an extension cost in Oxfordshire?
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.
Do I need planning permission for an extension in Oxfordshire?
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.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Oxfordshire, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in Oxfordshire
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.