Extending your home in Hampshire
Looking to extend your home in Hampshire? Start here: extension types, guide prices for Hampshire, the planning rules that apply and how a project runs.
- Towns listed19
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Postcode districts67
Towns we cover in Hampshire
Towns we cover here include Southampton, Portsmouth, Basingstoke, Gosport.
What works best for Hampshire houses?
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.
For many houses here, double-storey extensions, wraparound extensions or orangery extensions gives the most useful space for the budget.
Planning and building control in Hampshire
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.
What extensions cost in Hampshire
Every figure below is a guide for Hampshire, adjusted for South East England build costs (×1.12) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Extensions over a garage | 12 m² | £28,000 – £36,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
All extension types we build in Hampshire
- Bedroom extensions · from £29,000
- Building regulations for extensions · from £1,000
- Flat roof extensions · from £23,500
- Home office extensions · from £17,500
- Kitchen extensions · from £30,000
- Pitched roof extensions · from £24,500
- Porch extensions · from £4,450
- Glass box extensions · from £33,500
- Wraparound extensions · from £40,000
- Side extensions · from £24,500
- Extension plans and drawings · from £1,300
- Planning permission for extensions · from £350
- Bungalow extensions · from £29,000
- Side return extensions · from £20,000
- Extensions over a garage · from £26,500
- Orangery extensions · from £33,500
- Timber frame extensions · from £23,500
- Utility and boot room extensions · from £15,500
- Annexe extensions · from £61,500
- Conservatory replacement extensions · from £22,000
- Double-storey extensions · from £42,500
- Single-storey rear extensions · from £23,500
Neighbouring areas
Questions about extensions in Hampshire
How much does an extension cost in Hampshire?
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.
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.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Hampshire, and the guide-price tool gives a range for your own size and finish in about a minute.
Do I need planning permission for an extension in Hampshire?
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.
Book a free site visit in Hampshire
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.