Rhondda, South Wales Valleys
Side return extension in Rhondda
Side return extension in Rhondda: infilling the narrow passage beside a Victorian or Edwardian back addition. We measure the house, show you what the rules allow, price it in writing and build it.
Rhondda and its postcode districts CF40, CF41 and CF43 are part of our South Wales Valleys coverage. Side return projects in Rhondda usually start with a drainage survey of the side passage.
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 side return extension cost in Rhondda?
A side return extension in Rhondda is priced at £2,140–£3,530 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 |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £25,500–£42,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £37,500–£62,000 |
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 side return extension in Rhondda?
Here is how the rules in Wales apply to a side return extension in Rhondda.
Welsh side-extension rules limit a single-storey side addition to 4 metres high and a 50% increase in the width of the original house, with tighter limits in conservation areas. Wraparounds usually need a planning application.
In Wales, as in England, the Party Wall etc. Act 1996 requires notice to neighbours before work to a shared wall or excavation near their foundations.
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 Rhondda like to extend?
Rhondda 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 side return extension in Rhondda 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Side return extensions near Rhondda
Neighbouring places we cover include Tonypandy (2.6 miles) and Mountain Ash (3.4 miles).
- Side return extension in Tonypandy
- Side return extension in Mountain Ash
- Side return extension in Aberdare
- Side return extension in Pontypridd
- Side return extension in Treharris
Other work in Rhondda:
FAQ
Side return extension questions in Rhondda
Is the site visit in Rhondda free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Rhondda?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Is a side return permitted development?
Sometimes, as a side extension within the width and height limits, but not in conservation areas, and many terraces are in one.
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.
What postcode areas do you cover around Rhondda?
Including CF40, CF41 and CF43, and the surrounding South Wales Valleys area.
How much does a side return extension cost in Rhondda?
As a guide, £2,140–£3,530 per square metre including VAT for a standard specification. For example, 2 m wide × 6 m deep (12 m²): about £25,500–£42,500 at that rate. Your written price follows the survey.