Home extensions in East Sussex
Every type of house extension in East Sussex, from single-storey kitchen extensions to two-storey additions, side returns and orangeries. We design, handle the approvals and build.
- Towns listed11
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts34
Towns we cover in East Sussex
Towns we cover here include Brighton, Eastbourne, Hastings, Hove.
Choosing the right extension in East Sussex
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, wraparound extensions or orangery extensions gives the most useful space for the budget.
Guide prices for East Sussex
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) |
|---|---|---|
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
Planning rules in East Sussex
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.
Choose an extension type
- Annexe extensions · from £61,500
- Home office extensions · from £17,500
- Utility and boot room extensions · from £15,500
- Porch extensions · from £4,450
- Conservatory replacement extensions · from £22,000
- Side return extensions · from £20,000
- Extensions over a garage · from £26,500
- Building regulations for extensions · from £1,000
- Flat roof extensions · from £23,500
- Bedroom extensions · from £29,000
- Extension plans and drawings · from £1,300
- Pitched roof extensions · from £24,500
- Timber frame extensions · from £23,500
- Single-storey rear extensions · from £23,500
- Bungalow extensions · from £29,000
- Kitchen extensions · from £30,000
- Glass box extensions · from £33,500
- Wraparound extensions · from £40,000
- Planning permission for extensions · from £350
- Side extensions · from £24,500
- Orangery extensions · from £33,500
- Double-storey extensions · from £42,500
Neighbouring areas
Questions about extensions in East Sussex
How much does an extension cost in East Sussex?
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 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 East Sussex?
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for East Sussex, and the guide-price tool gives a range for your own size and finish in about a minute.
Book a free site visit in East Sussex
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.