Home extensions in Christchurch
From a small utility to a two-storey addition, we take on house extensions throughout Christchurch, starting with a free visit and a planning check.
- Postcode districtsBH5, BH6, BH7, BH23
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Planning rules in Christchurch
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 Christchurch
South West homes range from terraced streets in the cities to stone cottages and bungalows in the countryside, and conservation areas are common in historic centres.
Start by comparing single-storey rear extensions, orangery extensions and pitched roof extensions: between them they cover most of the layouts we see requested for houses like these.
Christchurch extension prices at a glance
Use these Christchurch 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) |
|---|---|---|
| Side return extensions | 11 m² | £26,500 – £34,000 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Kitchen extensions | 20 m² | £42,500 – £54,500 |
Covering Christchurch and nearby
Postcode districts we cover around Christchurch include BH5, BH6, BH7, BH23. Neighbouring towns we cover include Bournemouth (4 miles), Ferndown (7 miles), Poole (9 miles), Wimborne Minster (10 miles), Swanage (12 miles). New Milton, in Hampshire, is roughly 5 miles from Christchurch and also on our list.
Choose an extension type
- Side extensions · from £22,000
- Annexe extensions · from £56,000
- Extension plans and drawings · from £1,200
- Single-storey rear extensions · from £21,000
- Porch extensions · from £4,050
- Kitchen extensions · from £27,500
- Extensions over a garage · from £24,000
- Timber frame extensions · from £21,000
- Side return extensions · from £18,000
- Bungalow extensions · from £26,500
- Home office extensions · from £16,000
- Building regulations for extensions · from £900
- Planning permission for extensions · from £350
- Orangery extensions · from £30,500
- Flat roof extensions · from £21,000
- Bedroom extensions · from £26,500
- Wraparound extensions · from £36,500
- Double-storey extensions · from £38,500
- Pitched roof extensions · from £22,500
- Glass box extensions · from £30,500
- Utility and boot room extensions · from £14,000
- Conservatory replacement extensions · from £20,000
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
Drawings are prepared and agreed with you, then submitted for the right planning route and building regulations approval.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Our team builds the extension, keeps you updated weekly and finishes with building control sign-off.
Questions about extensions in Christchurch
How much does an extension cost in Christchurch?
Using our South West England factor (×1.02), a standard-spec single-storey extension of 20 m² is a guide £41,500 to £53,500 including VAT, and a 32 m² two-storey extension £58,500 to £77,000. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Christchurch, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Do I need planning permission for an extension in Christchurch?
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 Christchurch
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.