Royal Leamington Spa, Warwickshire
Semi-detached rear extension in Royal Leamington Spa
We plan and build rear extensions for semi-detached houses for homeowners in Royal Leamington Spa. Single or two-storey extensions for semi-detached houses, with side access and one party wall. Start with a free site visit, then a written price once the design is agreed.
We cover Royal Leamington Spa (CV31, CV32 and CV33) as part of our Warwickshire work. Semi-detached houses are common across Warwickshire, and their side access makes rear extensions quicker to build.
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 semi-detached rear extension cost in Royal Leamington Spa?
Guide prices for a semi-detached rear extension in Royal Leamington Spa start from our West Midlands rate of £1,900–£3,100 per square metre, including VAT. 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 |
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 Royal Leamington Spa?
Here is how the rules in England apply to a semi-detached rear extension in Royal Leamington Spa.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Royal Leamington Spa like to extend?
Royal Leamington Spa 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 semi-detached rear extension in Royal Leamington Spa 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.
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.
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.
Semi-detached rear extensions near Royal Leamington Spa
We also build rear extensions for semi-detached houses in nearby Warwick (2.7 miles) and Kenilworth (5.2 miles).
- Semi-detached rear extension in Warwick
- Semi-detached rear extension in Kenilworth
- Semi-detached rear extension in Coventry
- Semi-detached rear extension in Stratford-upon-Avon
- Semi-detached rear extension in Knowle
Other work in Royal Leamington Spa:
FAQ
Semi-detached rear extension questions in Royal Leamington Spa
What postcode areas do you cover around Royal Leamington Spa?
Including CV31, CV32 and CV33, and the surrounding Warwickshire area.
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.
Do I need a party wall agreement?
Usually with the attached neighbour, in England and Wales.
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.
Do I need planning permission for a rear extension in Royal Leamington Spa?
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.
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.