Cwmbran, South Wales Valleys
Glazed rear extension in Cwmbran
We plan and build glazed and glass-box rear extensions for homeowners in Cwmbran. 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.
Cwmbran and its postcode districts NP44 are part of our South Wales Valleys coverage. If your garden in Cwmbran 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 Cwmbran?
Guide prices for a glazed rear extension in Cwmbran start from our Wales rate of £2,600–£4,460 per square metre, including VAT. 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a glazed rear extension in Cwmbran?
Whether your glazed rear extension in Cwmbran needs a planning application depends on its size, your house and any local restrictions.
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. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Cwmbran like to extend?
Stone terraces along the valley floors and post-war semis higher up are typical of Cwmbran. Sloping sites are common, so floor levels and retaining walls are designed at the start.
How a glazed rear extension in Cwmbran 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.
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 Cwmbran
We also build glazed and glass-box rear extensions in nearby Pontypool (3.4 miles) and Caerleon (4.3 miles).
- Glazed rear extension in Pontypool
- Glazed rear extension in Caerleon
- Glazed rear extension in Risca
- Glazed rear extension in Newport
- Glazed rear extension in Abercarn
Other work in Cwmbran:
FAQ
Glazed rear extension questions in Cwmbran
How much does a glazed rear extension cost in Cwmbran?
As a guide, £2,600–£4,460 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £31,000–£53,500 at that rate. Your written price follows the survey.
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.
Does glass need planning permission?
The same rules apply as any rear extension; glass does not change the depth or height limits.
Is the site visit in Cwmbran 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 Cwmbran?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.