Abercarn, South Wales Valleys
Glazed rear extension in Abercarn
We plan and build glazed and glass-box rear extensions for homeowners in Abercarn. Full-height glass, slim frames and big rooflights for the most open rear room. Start with a free site visit, then a written price once the design is agreed.
Abercarn sits in the South Wales Valleys, with postcode districts including NP11. If your garden in Abercarn faces south, expect us to talk about overhangs and solar-control glass before frame colours.
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 glazed rear extension cost in Abercarn?
For Abercarn we work from the Wales rate: £2,600–£4,460 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) | £31,000–£53,500 |
| 4 m wide × 6 m deep (24 m²) | £62,500–£107,000 |
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 glazed rear extension in Abercarn?
Here is how the rules in Wales apply to a glazed rear extension in Abercarn.
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.
Wales has its own Approved Document L, with targets for walls, roofs, floors and glazing similar to but not identical with England's. Heavily glazed designs are checked with a calculation.
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 Abercarn like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Abercarn. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a glazed rear extension in Abercarn 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
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.
Glazed rear extensions near Abercarn
Close by, we work in Risca, about 3.1 miles away, and Blackwood, about 3.4 miles away.
- Glazed rear extension in Risca
- Glazed rear extension in Blackwood
- Glazed rear extension in Cwmbran
- Glazed rear extension in Bargoed
- Glazed rear extension in Gelligaer
Other work in Abercarn:
FAQ
Glazed rear extension questions in Abercarn
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.
How long does a rear extension take to build in Abercarn?
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 glass box a conservatory?
No. It is built to Building Regulations as part of the house, with insulated floor and roof, so it is usable all year.
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.
Is the site visit in Abercarn free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
What postcode areas do you cover around Abercarn?
Including NP11, and the surrounding South Wales Valleys area.