Bournemouth house extensions
Planning an extension in Bournemouth? Compare extension types, see guide prices adjusted for Bournemouth and book a free site visit.
- Postcode districtsBH1, BH2, BH3, BH4, BH8, BH13
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Bournemouth and surrounding towns
Site visits are available across Bournemouth (BH1, BH2, BH3, BH4, BH8, BH13). We also work in nearby Christchurch (4 miles), Poole (5 miles), Ferndown (6 miles), Wimborne Minster (8 miles), Swanage (9 miles). For homes towards Hampshire, New Milton is around 10 miles away.
Choosing the right extension in Bournemouth
In the South West, local stone, render and brick vary from town to town, so matching materials is a big part of designing an extension that looks right.
The types we would usually look at first for a home in Bournemouth are orangery extensions, annexe extensions and pitched roof extensions, depending on the garden and how the house is laid out.
Popular extension prices in Bournemouth
Every figure below is a guide for Bournemouth, adjusted for South West England build costs (×1.02) and including VAT. Design and council fees are shown separately on each page.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
Approvals for an extension in Bournemouth
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 single-storey side return infill is often permitted development if it stays within the height limits and is no wider than half the width of the original house. Conservation areas, listed buildings and flats always need an application, and the boundary wall usually brings in the Party Wall Act.
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 Bournemouth
- Wraparound extensions · from £36,500
- Home office extensions · from £16,000
- Flat roof extensions · from £21,000
- Extension plans and drawings · from £1,200
- Bungalow extensions · from £26,500
- Double-storey extensions · from £38,500
- Single-storey rear extensions · from £21,000
- Glass box extensions · from £30,500
- Bedroom extensions · from £26,500
- Pitched roof extensions · from £22,500
- Porch extensions · from £4,050
- Conservatory replacement extensions · from £20,000
- Side return extensions · from £18,000
- Utility and boot room extensions · from £14,000
- Extensions over a garage · from £24,000
- Kitchen extensions · from £27,500
- Side extensions · from £22,000
- Annexe extensions · from £56,000
- Orangery extensions · from £30,500
- Timber frame extensions · from £21,000
- Building regulations for extensions · from £900
- Planning permission for extensions · from £350
Free site visit
A designer visits, takes measurements and photos, and discusses layouts, budget and timing with you.
Design and approvals
We produce the drawings and structural design, and manage the approvals so they are in place before work starts.
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 Bournemouth
How much does an extension cost in Bournemouth?
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 Bournemouth, 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.
How long does an extension take in Bournemouth?
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.
Do I need planning permission for an extension in Bournemouth?
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 Bournemouth
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.