Extending your home in Bicester
Every type of house extension in Bicester, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Postcode districtsOX6, OX25, OX26, OX27
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Guide prices for Bicester
Use these Bicester guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
Which extension suits a Bicester 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.
For many houses here, double-storey extensions, single-storey rear extensions or wraparound extensions gives the most useful space for the budget.
Areas we cover around Bicester
Across OX6, OX25, OX26, OX27, we can visit, measure and advise. Nearby, we also take on projects in Oxford (11 miles), Thame (13 miles), Banbury (14 miles), Witney (16 miles), Abingdon (17 miles). Brackley, in Northamptonshire, is roughly 9 miles from Bicester and also on our list.
Planning rules in Bicester
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).
Choose an extension type
- Orangery extensions · from £33,500
- Side extensions · from £24,500
- Single-storey rear extensions · from £23,500
- Side return extensions · from £20,000
- Kitchen extensions · from £30,000
- Planning permission for extensions · from £350
- Flat roof extensions · from £23,500
- Pitched roof extensions · from £24,500
- Home office extensions · from £17,500
- Bungalow extensions · from £29,000
- Building regulations for extensions · from £1,000
- Timber frame extensions · from £23,500
- Annexe extensions · from £61,500
- Bedroom extensions · from £29,000
- Extension plans and drawings · from £1,300
- Conservatory replacement extensions · from £22,000
- Double-storey extensions · from £42,500
- Wraparound extensions · from £40,000
- Utility and boot room extensions · from £15,500
- Extensions over a garage · from £26,500
- Glass box extensions · from £33,500
- Porch extensions · from £4,450
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
Design and approvals
Once the layout is agreed, we deal with the council: planning permission or written confirmation that none is needed, plus building control.
Fixed written price
With the design and specification agreed, you get a fixed written price and a start date.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Bicester
How much does an extension cost in Bicester?
Using our South East England factor (×1.12), a standard-spec single-storey extension of 20 m² is a guide £45,500 to £58,500 including VAT, and a 32 m² two-storey extension £64,500 to £84,500. Your written price follows the survey.
Do you cover all of Bicester?
Yes, including the surrounding parts of Oxfordshire. Site visits are free and there is no obligation.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
How long does an extension take in Bicester?
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.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Book a free site visit in Bicester
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.