House extensions in Hadleigh
More space without moving: we plan and build extensions across Hadleigh, with one team for the drawings, the council and the build.
- Postcode districtsSS7, SS9
- Price regionEast of England (×1.06)
- Planning rulesEngland
- Site visitFree, no obligation
What extensions cost in Hadleigh
Use these Hadleigh 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) |
|---|---|---|
| Single-storey rear extensions | 20 m² | £43,000 – £55,500 |
| Wraparound extensions | 25 m² | £60,500 – £77,000 |
| Orangery extensions | 16 m² | £47,000 – £59,500 |
| Double-storey extensions | 32 m² | £61,000 – £80,000 |
| Kitchen extensions | 20 m² | £44,500 – £56,500 |
| Extensions over a garage | 12 m² | £26,500 – £34,500 |
| Side return extensions | 11 m² | £27,500 – £35,000 |
Do extensions in Hadleigh 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.
If the work involves a shared wall, building on the boundary, or digging foundations within 3 m (sometimes 6 m) of a neighbour's building, the Party Wall etc. Act 1996 applies and notice must be served before work starts: two months for work to a party wall, one month for new walls on the boundary and for excavations.
Applications are decided by the local planning authority (your district, borough or unitary council).
Choosing the right extension in Hadleigh
Across the East of England many houses sit on generous plots, and single-storey and wraparound extensions are a natural fit.
Start by comparing single-storey rear extensions, bungalow extensions and wraparound extensions: between them they cover most of the layouts we see requested for houses like these.
Hadleigh and surrounding towns
Our survey diary covers Hadleigh, including SS7, SS9. We also work in nearby Benfleet (2 miles), Rayleigh (2 miles), Canvey Island (2 miles), Southend-on-Sea (5 miles), Wickford (5 miles). Just over the Kent border, Gillingham is about 12 miles away.
All extension types we build in Hadleigh
- Extension plans and drawings · from £1,250
- Glass box extensions · from £31,500
- Double-storey extensions · from £40,000
- Pitched roof extensions · from £23,500
- Annexe extensions · from £58,000
- Side return extensions · from £19,000
- Flat roof extensions · from £22,000
- Side extensions · from £23,000
- Utility and boot room extensions · from £14,500
- Building regulations for extensions · from £950
- Conservatory replacement extensions · from £21,000
- Bedroom extensions · from £27,500
- Bungalow extensions · from £27,500
- Kitchen extensions · from £28,500
- Porch extensions · from £4,200
- Orangery extensions · from £31,500
- Wraparound extensions · from £38,000
- Extensions over a garage · from £25,000
- Planning permission for extensions · from £350
- Home office extensions · from £16,500
- Single-storey rear extensions · from £22,000
- Timber frame extensions · from £22,000
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
You receive a written, itemised price and programme. Nothing starts until you are happy with it.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Hadleigh
How much does an extension cost in Hadleigh?
Using our East of England factor (×1.06), a standard-spec single-storey extension of 20 m² is a guide £43,000 to £55,500 including VAT, and a 32 m² two-storey extension £61,000 to £80,000. Your written price follows the survey.
Do I need planning permission for an extension in Hadleigh?
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 cover all of Hadleigh?
Yes, including the surrounding parts of Essex. Site visits are free and there is no obligation.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Hadleigh, and the guide-price tool gives a range for your own size and finish in about a minute.
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.
Book a free site visit in Hadleigh
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.