Blackwood, South Wales Valleys
Terraced house rear extension in Blackwood
Rear and side return extensions for terraces, with access through the house and two neighbours. We design, get the approvals for and build rear extensions for terraced houses 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. In Blackwood we plan the delivery route through the house and the skip licence before anything else.
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 terraced house rear extension cost in Blackwood?
For Blackwood we work from the Wales rate: £1,910–£3,070 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 × 4.5 m deep (13.5 m²) | £25,500–£41,500 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£55,000 |
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 terraced house rear extension in Blackwood?
Here is how the rules in Wales apply to a terraced house rear extension in Blackwood.
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.
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. 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 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 terraced house rear extension in Blackwood comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
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.
Terraced house rear extensions near Blackwood
We also build rear extensions for terraced houses in nearby Bargoed (1.5 miles) and Gelligaer (2.1 miles).
- Terraced house rear extension in Bargoed
- Terraced house rear extension in Gelligaer
- Terraced house rear extension in Abercarn
- Terraced house rear extension in Nelson
- Terraced house rear extension in Treharris
Other work in Blackwood:
FAQ
Terraced house rear extension questions in Blackwood
How much does a terraced house rear extension cost in Blackwood?
As a guide, £1,910–£3,070 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £25,500–£41,500 at that rate. Your written price follows the survey.
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.
Do both neighbours need party wall notices?
Usually yes in England and Wales, because the extension often sits on or near both boundaries.
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.
How long does a rear extension take to build in Blackwood?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Can you match the brick or stone on my Blackwood house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.