Castle Vale, West Midlands
Two-storey rear extension in Castle Vale
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Castle Vale and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Castle Vale and its postcode districts B24, B34 and B35 are part of our West Midlands coverage. In the West Midlands we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
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 two-storey rear extension cost in Castle Vale?
Guide prices for a two-storey rear extension in Castle Vale start from our West Midlands rate of £1,800–£2,700 per square metre, including VAT. The West Midlands is the baseline for our guide prices.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £54,000–£81,000 |
| 4 m × 6 m footprint, two floors (48 m²) | £86,500–£129,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a two-storey rear extension in Castle Vale?
Whether your two-storey rear extension in Castle Vale needs a planning application depends on its size, your house and any local restrictions.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
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 Castle Vale like to extend?
Castle Vale has a lot of post-war semis and estate houses with long gardens and side access, which makes rear extensions quicker to build.
How a two-storey rear extension in Castle Vale 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.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
Two-storey rear extensions near Castle Vale
From Castle Vale, the nearest places we also cover are Washwood Heath (1.8 miles) and Sutton Coldfield (3.4 miles).
- Two-storey rear extension in Washwood Heath
- Two-storey rear extension in Sutton Coldfield
- Two-storey rear extension in Chelmsley Wood
- Two-storey rear extension in Aston
- Two-storey rear extension in Acocks Green
Other work in Castle Vale:
FAQ
Two-storey rear extension questions in Castle Vale
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Do I need planning permission for a rear extension in Castle Vale?
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.
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
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.
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.
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.