Birmingham, West Midlands
Single-storey rear extension in Birmingham
Thinking about a single-storey rear extension in Birmingham? Ground-floor space across the back of the house, usually for a kitchen, dining or family room. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
Birmingham and its postcode districts B6, B8, B19 and B23 are part of our West Midlands coverage. A single-storey rear extension in Birmingham is mostly built from the garden side, so the house stays usable for most of the job.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a single-storey rear extension cost in Birmingham?
A single-storey rear extension in Birmingham is priced at £1,900–£3,100 per square metre including VAT as a guide, before kitchen fit-out and fees. The West Midlands is the baseline for our guide prices.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £23,000–£37,000 |
| 4 m wide × 5 m deep (20 m²) | £38,000–£62,000 |
| 4 m wide × 6 m deep (24 m²) | £45,500–£74,500 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a single-storey rear extension in Birmingham?
Whether your single-storey rear extension in Birmingham needs a planning application depends on its size, your house and any local restrictions.
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.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
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.
How a single-storey rear extension in Birmingham comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Single-storey rear extensions near Birmingham
From Birmingham, the nearest places we also cover are Aston (1.5 miles) and Hockley (1.5 miles).
- Single-storey rear extension in Aston
- Single-storey rear extension in Hockley
- Single-storey rear extension in Smethwick
- Single-storey rear extension in Washwood Heath
- Single-storey rear extension in Acocks Green
Other work in Birmingham:
FAQ
Single-storey rear extension questions in Birmingham
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
How much does a single-storey rear extension cost in Birmingham?
As a guide, £1,900–£3,100 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £23,000–£37,000 at that rate. Your written price follows the survey.
Will the extension make the room behind it dark?
Not if it is designed well. Rooflights or a lantern over the old back room, and a wide opening into it, keep daylight reaching the middle of the house.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Do you handle building control in Birmingham?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
Is the site visit in Birmingham free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.