Treharris, South Wales Valleys
Bungalow rear extension in Treharris
Single-storey rear extensions that keep everything on one level. If you live in Treharris and want to know what a bungalow rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Treharris sits in the South Wales Valleys, with postcode districts including CF46. For bungalows in the South Wales Valleys, a rear extension is the usual way to add space without adding stairs.
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 Treharris?
For Treharris we work from the Wales rate: £1,720–£2,790 per square metre of new floor, including VAT, standard specification. 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 |
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 bungalow rear extension in Treharris?
Here is how the rules in Wales apply to a bungalow rear extension in Treharris.
Welsh permitted development allows a single-storey rear extension of up to 4 metres in depth and 4 metres in height, subject to boundary and garden-coverage limits. There is no larger-extension prior approval scheme in Wales.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development or a householder planning application.
What are homes in Treharris like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Treharris. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a bungalow rear extension in Treharris comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Bungalow rear extensions near Treharris
We also build rear extensions for bungalows in nearby Nelson (1.2 miles) and Gelligaer (2.2 miles).
- Bungalow rear extension in Nelson
- Bungalow rear extension in Gelligaer
- Bungalow rear extension in Mountain Ash
- Bungalow rear extension in Bargoed
- Bungalow rear extension in Blackwood
Other work in Treharris:
FAQ
Bungalow rear extension questions in Treharris
How much does a bungalow rear extension cost in Treharris?
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.
What postcode areas do you cover around Treharris?
Including CF46, and the surrounding South Wales Valleys area.
Will the roof look odd?
Not if the pitch and tiles match. Where the eaves are low, a flat-roofed section with a lantern is an alternative.
Do I need a party wall agreement?
In Wales, usually yes if the extension is on or near a shared boundary or close to a neighbour's foundations. We serve the notices.
Can you match the brick or stone on my Treharris house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do you handle building control in Treharris?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.