Mountain Ash, South Wales Valleys
Bungalow rear extension in Mountain Ash
Single-storey rear extensions that keep everything on one level. We design, get the approvals for and build rear extensions for bungalows in Mountain Ash and the surrounding area, with one contract from the first survey to building control sign-off.
Mountain Ash sits in the South Wales Valleys, with postcode districts including CF43 and CF45. For Mountain Ash bungalows we design the roof first, because the low eaves decide the height of the new room.
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 bungalow rear extension cost in Mountain Ash?
A bungalow rear extension in Mountain Ash is priced at £1,720–£2,790 per square metre including VAT as a guide, before kitchen fit-out and fees. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £20,500–£33,500 |
| 4 m wide × 6 m deep (24 m²) | £41,500–£67,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a bungalow rear extension in Mountain Ash?
Whether your bungalow rear extension in Mountain Ash needs a planning application depends on its size, your house and any local restrictions.
In Wales a single-storey rear extension can often be permitted development if it projects no more than 4 metres beyond the rear wall and is no more than 4 metres high. Wales has no prior approval route for deeper extensions, so anything bigger needs a householder planning application.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings 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 Mountain Ash like to extend?
Mountain Ash is largely terraced streets on sloping ground, where back gardens step up or down from the house. Excavation, retaining walls and drainage are priced at the survey.
How a bungalow rear extension in Mountain Ash 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 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.
Bungalow rear extensions near Mountain Ash
Close by, we work in Treharris, about 3.4 miles away, and Rhondda, about 3.4 miles away.
- Bungalow rear extension in Treharris
- Bungalow rear extension in Rhondda
- Bungalow rear extension in Aberdare
- Bungalow rear extension in Merthyr Tydfil
- Bungalow rear extension in Nelson
Other work in Mountain Ash:
FAQ
Bungalow rear extension questions in Mountain Ash
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.
What postcode areas do you cover around Mountain Ash?
Including CF43 and CF45, and the surrounding South Wales Valleys area.
Is a bungalow extension cheaper?
The rates are similar per square metre; roof work can add a little.
Do you handle building control in Mountain Ash?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
How much does a bungalow rear extension cost in Mountain Ash?
As a guide, £1,720–£2,790 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £20,500–£33,500 at that rate. Your written price follows the survey.
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.