What is a single-storey extension?
A single-storey extension is a ground-floor addition, usually at the rear of a house, that enlarges a kitchen, living or dining space. Most are built with cavity walls on concrete foundations and finished with a flat roof and roof lantern or a pitched tiled roof.
How much does a single-storey extension cost in Yate?
In Yate, a single-storey extension typically costs £2,000–£2,950 per m² of floor area, including VAT at 20% (standard rate). For a typical 20 m² project that is roughly £40,000–£59,000. Building costs in the South West are close to the UK average, so the figures for Yate are close to our national guide. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| Smaller project (14 m²) | £28,000–£41,500 |
| Typical project (20 m²) | £40,000–£59,000 |
| Larger project (28 m²) | £56,000–£82,500 |
| Rate per m² | £2,000–£2,950 |
The main things that change the cost:
- Roof type and the size of any lantern or roof windows
- Floor area and the length of new wall
- How much of the existing house is opened up
- Kitchen, flooring and finishes, which we can include or leave to you
For a figure based on your own measurements, try the guide price tool, then book a free home visit for a fixed quote.
Do you need planning permission for a single-storey extension in Yate?
Approvals for a single-storey extension in Yate follow the rules for England. In England a single-storey rear extension is often permitted development: broadly up to 3 metres deep on a semi-detached or terraced house and 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary, and covering no more than half the garden. The larger home extension scheme allows up to 6 or 8 metres if you notify the council first and neighbours have a chance to comment. In conservation areas, National Parks and National Landscapes the larger home extension route, side extensions and cladding are not permitted development. Flats and houses whose rights have been removed need a planning application, and listed buildings need listed building consent.
Where work involves a shared wall, building on the boundary, or digging foundations within 3 metres of a neighbour’s building and deeper than its foundations (or within 6 metres for deeper work), the Party Wall etc. Act 1996 applies and notices must be served before work starts.
If the answer is not clear-cut, we can apply for formal confirmation before you commit to the build.
What we handle
Handled as part of most single-storey extensions:
- Measured survey and design drawings
- First and second fix electrics, heating and plastering
- Doors, windows and roof glazing installed
- Foundations, drainage and any build-over agreement
- Structural calculations for steels and lintels
- Building control inspections and completion certificate
How long does it take?
Allow 10 to 14 weeks on site for a typical rear extension, after approvals. Allow time beforehand for drawings and approvals, usually 6 to 12 weeks.
Building in Yate
The South West mixes stone and render cottages with post-war and newer estates, and local materials matter more here when matching an extension.
Yate sits in Gloucestershire, about 24 miles south of Gloucester. We cover the whole of Yate, including postcodes BS37.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and pricing
Design options, then a fixed quote based on the chosen drawings and specification.
- 03
Permissions sorted
Applications, building control and neighbour arrangements, all before the start date.
- 04
Construction and completion
We build, put right any snags and hand over the building control certificate.
Questions about single-storey extensions in Yate
Do I need a party wall agreement?
If you are in England or Wales and the work involves a shared wall, building on the boundary or digging foundations close to a neighbour, the Party Wall etc. Act 1996 applies and notices must be served before work starts. We advise on this at the design stage.
Do I need planning permission for a single-storey extension?
Not always. Many small rear extensions are permitted development, within limits on depth, height and how much of the garden is covered. The limits depend on which nation you live in and on protected areas such as conservation areas, and flats or houses whose rights have been removed need an application. We check this at the survey and can apply to the council for formal confirmation.
How long does a single-storey extension take in Yate?
Typically 10 to 14 weeks on site for a typical rear extension, after approvals. Design and approvals beforehand usually take 6 to 12 weeks.
How much does a single-storey extension cost in Yate?
In Yate, a single-storey extension typically costs £2,000–£2,950 per m² of floor area, including VAT at 20% (standard rate). A typical 20 m² project comes to roughly £40,000–£59,000. Your fixed price depends on the survey and drawings.
Can I stay in the house during the build?
Usually yes. We build the shell before opening up the back wall, so the house stays weathertight for most of the job. There will be a few weeks when the kitchen or back room is out of use.