Semi-detached rear extension in Brownhills

How much does a semi-detached rear extension cost in Brownhills?

In Brownhills, our guide for a semi-detached rear extension is £1,900–£3,100 per square metre including VAT for a standard specification. The West Midlands is the baseline for our guide prices.

Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.

Do you need planning permission for a semi-detached rear extension in Brownhills?

Here is how the rules in England apply to a semi-detached rear extension in Brownhills.

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's rules allow a rear extension of more than one storey without an application only when it is no deeper than 3 metres and at least 7 metres from the boundary opposite the rear wall, and never on designated land. Most two-storey schemes need householder planning permission.

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. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.

What are homes in Brownhills like to extend?

Red-brick terraces and 1930s semis make up much of Brownhills. Many already have a small kitchen lean-to at the back, which a new rear extension usually replaces rather than adds to.

How a semi-detached rear extension in Brownhills comes together

1. 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.

2. Design and guide price

   Two or three layout options with a guide price for each, so you choose the design knowing what it costs.

3. Planning and regulations

   We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.

4. Build and sign-off

   We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.

Semi-detached rear extensions near Brownhills

We also build rear extensions for semi-detached houses in nearby Pelsall (1.5 miles) and Aldridge (2.0 miles).

• Semi-detached rear extension in Pelsall
• Semi-detached rear extension in Aldridge
• Semi-detached rear extension in Bloxwich
• Semi-detached rear extension in Burntwood
• Semi-detached rear extension in Great Wyrley

Other work in Brownhills:

• Single-storey rear extension
• Two-storey rear extension
• Kitchen-diner rear extension
• Side return extension
• Wraparound extension
• Glazed rear extension

All rear extensions in Brownhills