Extensions in Mangotsfield: design, planning and build
More space without moving: we plan and build extensions across Mangotsfield, with one team for the drawings, the council and the build.
- Postcode districtsBS15, BS16, BS36
- Price regionSouth West England (×1.02)
- Planning rulesEngland
- Site visitFree, no obligation
Areas we cover around Mangotsfield
We cover Mangotsfield and the postcode districts BS15, BS16, BS36. Neighbouring towns we cover include Kingswood (2 miles), Yate (5 miles), Thornbury (8 miles), Dursley (15 miles), Stroud (22 miles). Just over the Somerset border, Keynsham is about 5 miles away.
Guide prices for Mangotsfield
Prices on this page use our South West England factor of ×1.02, 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) |
|---|---|---|
| Double-storey extensions | 32 m² | £58,500 – £77,000 |
| Single-storey rear extensions | 20 m² | £41,500 – £53,500 |
| Side return extensions | 11 m² | £26,500 – £34,000 |
| Extensions over a garage | 12 m² | £25,500 – £33,500 |
| Conservatory replacement extensions | 14 m² | £30,500 – £39,500 |
| Wraparound extensions | 25 m² | £58,500 – £74,000 |
| Orangery extensions | 16 m² | £45,500 – £57,500 |
Planning and building control in Mangotsfield
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.
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 works best for Mangotsfield houses?
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.
Start by comparing pitched roof extensions, single-storey rear extensions and orangery extensions: between them they cover most of the layouts we see requested for houses like these.
Every extension type in Mangotsfield
- Side return extensions · from £18,000
- Pitched roof extensions · from £22,500
- Bedroom extensions · from £26,500
- Bungalow extensions · from £26,500
- Building regulations for extensions · from £900
- Extensions over a garage · from £24,000
- Double-storey extensions · from £38,500
- Home office extensions · from £16,000
- Annexe extensions · from £56,000
- Timber frame extensions · from £21,000
- Extension plans and drawings · from £1,200
- Flat roof extensions · from £21,000
- Kitchen extensions · from £27,500
- Side extensions · from £22,000
- Porch extensions · from £4,050
- Orangery extensions · from £30,500
- Single-storey rear extensions · from £21,000
- Utility and boot room extensions · from £14,000
- Conservatory replacement extensions · from £20,000
- Wraparound extensions · from £36,500
- Glass box extensions · from £30,500
- 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 draw the design, agree it with you and handle planning or permitted development checks and building regulations.
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 Mangotsfield
How much does an extension cost in Mangotsfield?
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.
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.
Will my neighbours need to be told?
If you apply for planning or prior approval the council notifies them, and in England party wall notices may be needed for work near a shared boundary.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
Book a free site visit in Mangotsfield
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.