Home extensions in New Milton
We design and build house extensions for homes in New Milton and the surrounding Hampshire area, with guide prices adjusted for the region.
- Postcode districtsBH25
- Price regionSouth East England (×1.12)
- Planning rulesEngland
- Site visitFree, no obligation
Where we work near New Milton
Postcode districts we cover around New Milton include BH25. Neighbouring towns we cover include Hythe (14 miles), Totton (14 miles), Southampton (15 miles), Eastleigh (20 miles), Fareham (22 miles). Christchurch, in Dorset, is roughly 5 miles from New Milton and also on our list.
Approvals for an extension in New Milton
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).
What extensions cost in New Milton
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) |
|---|---|---|
| Kitchen extensions | 20 m² | £47,000 – £59,500 |
| Double-storey extensions | 32 m² | £64,500 – £84,500 |
| Conservatory replacement extensions | 14 m² | £33,500 – £43,500 |
| Orangery extensions | 16 m² | £50,000 – £63,000 |
| Side return extensions | 11 m² | £29,500 – £37,000 |
| Wraparound extensions | 25 m² | £64,000 – £81,500 |
| Single-storey rear extensions | 20 m² | £45,500 – £58,500 |
Choosing the right extension in New Milton
In the South East, plenty of houses have already been extended once, which makes checking the remaining permitted development allowance an important early step.
Start by comparing orangery extensions, wraparound extensions and single-storey rear extensions: between them they cover most of the layouts we see requested for houses like these.
All extension types we build in New Milton
- Side return extensions · from £20,000
- Porch extensions · from £4,450
- Kitchen extensions · from £30,000
- Extension plans and drawings · from £1,300
- Bungalow extensions · from £29,000
- Annexe extensions · from £61,500
- Glass box extensions · from £33,500
- Double-storey extensions · from £42,500
- Home office extensions · from £17,500
- Timber frame extensions · from £23,500
- Side extensions · from £24,500
- Conservatory replacement extensions · from £22,000
- Building regulations for extensions · from £1,000
- Extensions over a garage · from £26,500
- Pitched roof extensions · from £24,500
- Planning permission for extensions · from £350
- Flat roof extensions · from £23,500
- Utility and boot room extensions · from £15,500
- Single-storey rear extensions · from £23,500
- Bedroom extensions · from £29,000
- Orangery extensions · from £33,500
- Wraparound extensions · from £40,000
Free site visit
It starts with a visit to your house to measure, check access and talk through ideas and budget.
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 New Milton
How much does an extension cost in New Milton?
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 I need planning permission for an extension in New Milton?
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 New Milton?
Yes, including the surrounding parts of Hampshire. 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 New Milton?
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 New Milton
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.