Dorset
Rear extensions in Broadstone
We design and build rear extensions for homes in Broadstone, Dorset, from single-storey kitchen-diners across the back of the house to two-storey extensions that add a bedroom above.
Broadstone is in Dorset, with postcode districts including BH15, BH17 and BH18. The nearest places we also cover are Canford Heath (1.2 miles) and Wimborne Minster (1.9 miles).
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Broadstone
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for bungalows
- Rear extension plans and planning applications
Also available across Dorset:
- Rear extensions for detached houses
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Larger home extension prior approval (England)
- Building Regulations for rear extensions
Rear extension prices in Broadstone
South West prices run slightly above our West Midlands baseline; natural stone to match the house is the main variable.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £23,500–£38,500 |
| Single-storey, 4 m × 6 m (24 m²) | £47,500–£77,500 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £56,000–£84,000 |
| Side return, about 14 m² | £33,500–£55,500 |
| Wraparound, about 25 m² | £57,000–£93,500 |
What are homes in Broadstone like to extend?
Stone-built and rendered houses are common around Broadstone, so matching the walling is a design decision in its own right: natural stone, reconstituted stone or a render finish across old and new.
Planning rules for Broadstone
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Broadstone?
A 3 m × 4 m single-storey rear extension is about £23,500–£38,500 including VAT at our South West England guide rates; the written price follows a survey.
Do I need planning permission in Broadstone?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Is the site visit in Broadstone free?
Yes, with no obligation.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.