West Midlands
Rear extensions in Birmingham
We design and build rear extensions for homes in Birmingham, West Midlands, from single-storey kitchen-diners across the back of the house to two-storey extensions that add a bedroom above.
Birmingham is in the West Midlands, with postcode districts including B6, B8, B19, B23 and B28. The nearest places we also cover are Aston (1.5 miles) and Hockley (1.5 miles).
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Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Birmingham
- 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 the West Midlands:
- 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 Birmingham
The West Midlands is the baseline for our guide prices.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £23,000–£37,000 |
| Single-storey, 4 m × 6 m (24 m²) | £45,500–£74,500 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £54,000–£81,000 |
| Side return, about 14 m² | £32,000–£53,000 |
| Wraparound, about 25 m² | £55,000–£90,000 |
What are homes in Birmingham like to extend?
Red-brick terraces and 1930s semis make up much of Birmingham. Many already have a small kitchen lean-to at the back, which a new rear extension usually replaces rather than adds to.
Planning rules for Birmingham
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.
Every rear extension in England needs Building Regulations approval, whether or not planning is needed. You can use the council's building control service or a registered building control approver, by full plans (checked before work, usually within five weeks) or a building notice, and you get a completion certificate at the end.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Birmingham?
A 3 m × 4 m single-storey rear extension is about £23,000–£37,000 including VAT at our West Midlands guide rates; the written price follows a survey.
Do I need planning permission in Birmingham?
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 Birmingham 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.