Extending your home in East Grinstead
More space without moving: we plan and build extensions across East Grinstead, with one team for the drawings, the council and the build.
- Postcode districtsRH19
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Choosing the right extension in East Grinstead
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 East Grinstead are double-storey extensions, wraparound extensions and single-storey rear extensions, depending on the garden and how the house is laid out.
Areas we cover around East Grinstead
Our survey diary covers East Grinstead, including RH19. Neighbouring towns we cover include Crawley (8 miles), Haywards Heath (10 miles), Burgess Hill (13 miles), Horsham (15 miles), Shoreham-by-Sea (23 miles). For homes towards Surrey, Horley is around 7 miles away.
What extensions cost in East Grinstead
We publish guide prices so you can budget before anyone visits. For East Grinstead they are adjusted by ×1.12, the factor we use across South East England.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
Do extensions in East Grinstead 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 England a two-storey rear extension is permitted development only if it projects no more than 3 m from the original rear wall, sits at least 7 m from the rear boundary, matches the roof pitch and uses obscure, non-opening side windows upstairs. Most two-storey extensions therefore go through a householder planning application, which costs £548 from 1 April 2026 and normally takes about 8 weeks.
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).
All extension types we build in East Grinstead
- Wraparound extensions · from £40,000
- Porch extensions · from £4,450
- Bungalow extensions · from £29,000
- Planning permission for extensions · from £350
- Annexe extensions · from £61,500
- Conservatory replacement extensions · from £22,000
- Kitchen extensions · from £30,000
- Building regulations for extensions · from £1,000
- Glass box extensions · from £33,500
- Single-storey rear extensions · from £23,500
- Pitched roof extensions · from £24,500
- Extensions over a garage · from £26,500
- Timber frame extensions · from £23,500
- Flat roof extensions · from £23,500
- Extension plans and drawings · from £1,300
- Side extensions · from £24,500
- Double-storey extensions · from £42,500
- Orangery extensions · from £33,500
- Utility and boot room extensions · from £15,500
- Side return extensions · from £20,000
- Home office extensions · from £17,500
- Bedroom extensions · from £29,000
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
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
The build is managed from start to finish, inspected at each stage and signed off on completion.
Questions about extensions in East Grinstead
How much does an extension cost in East Grinstead?
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 East Grinstead?
Yes, including the surrounding parts of West Sussex. 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 East Grinstead?
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.
Book a free site visit in East Grinstead
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.