Knowle, West Midlands
Two-storey rear extension in Knowle
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We design, get the approvals for and build two-storey rear extensions in Knowle and the surrounding area, with one contract from the first survey to building control sign-off.
We cover Knowle (B40) as part of our West Midlands work. Two-storey rear extensions suit semi-detached houses in Knowle best, where the extra bedroom matters as much as the bigger kitchen.
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 Knowle?
In Knowle, our guide for a two-storey rear extension is £1,800–£2,700 per square metre including VAT for a standard specification. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in Knowle?
Planning for a two-storey rear extension in Knowle follows the English householder rules.
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.
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 Knowle like to extend?
Red-brick terraces and 1930s semis make up much of Knowle. Many already have a small kitchen lean-to at the back, which a new rear extension usually replaces rather than adds to.
How a two-storey rear extension in Knowle comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
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.
Two-storey rear extensions near Knowle
From Knowle, the nearest places we also cover are Solihull (2.9 miles) and Shirley (4.1 miles).
- Two-storey rear extension in Solihull
- Two-storey rear extension in Shirley
- Two-storey rear extension in Acocks Green
- Two-storey rear extension in Chelmsley Wood
- Two-storey rear extension in Kenilworth
Other work in Knowle:
FAQ
Two-storey rear extension questions in Knowle
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
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.
What is the 45-degree rule?
Many councils check that a two-storey extension does not cross a 45-degree line drawn from the nearest habitable window of the neighbouring house. We test it at the first drawing.
Is the site visit in Knowle free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.