Blackwood, South Wales Valleys
Side return extension in Blackwood
Infilling the narrow passage beside a Victorian or Edwardian back addition. We design, get the approvals for and build side return extensions in Blackwood and the surrounding area, with one contract from the first survey to building control sign-off.
Blackwood sits in the South Wales Valleys, with postcode districts including NP12. Side return projects in Blackwood 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 Blackwood?
For Blackwood we work from the Wales rate: £2,140–£3,530 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 |
|---|---|
| 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 |
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 side return extension in Blackwood?
Here is how the rules in Wales apply to a side return extension in Blackwood.
In Wales a single-storey side extension can be permitted development if it is no more than 4 metres high and the house ends up no more than 50% wider than the original. Many side return infills on terraced streets, and most wraparounds, go through a householder application.
The Party Wall etc. Act 1996 also applies in Wales: two months' notice for work to a shared wall and one month for foundations dug close to a neighbour's building.
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 Blackwood like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Blackwood. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a side return extension in Blackwood 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.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Side return extensions near Blackwood
Neighbouring places we cover include Bargoed (1.5 miles) and Gelligaer (2.1 miles).
- Side return extension in Bargoed
- Side return extension in Gelligaer
- Side return extension in Abercarn
- Side return extension in Nelson
- Side return extension in Treharris
Other work in Blackwood:
FAQ
Side return extension questions in Blackwood
Do I need planning permission for a rear extension in Blackwood?
Often not for a single-storey rear extension of up to 4 metres under Welsh permitted development. Wales has no prior approval route for deeper extensions.
What postcode areas do you cover around Blackwood?
Including NP12, and the surrounding South Wales Valleys area.
Where does the drainage go?
Side passages often carry the soil and rainwater pipes. We survey them first and reroute them under the new floor where needed.
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.
Do you handle building control in Blackwood?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.