Gorseinon, Swansea Bay
Glazed rear extension in Gorseinon
We plan and build glazed and glass-box rear extensions for homeowners in Gorseinon. 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.
Gorseinon and its postcode districts SA4 are part of our Swansea Bay coverage. A wide sliding door with one long rooflight, rather than a fully glazed roof, keeps a glass-led extension usable in summer.
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 Gorseinon?
Guide prices for a glazed rear extension in Gorseinon 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 Gorseinon?
Whether your glazed rear extension in Gorseinon needs a planning application depends on its size, your house and any local restrictions.
The Welsh Government's householder rules let many homes add a single-storey rear extension up to 4 metres deep and 4 metres high without a planning application. Deeper projects go through a householder application, because Wales has no prior approval route.
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 Gorseinon like to extend?
Older terraces near the centre and post-war semis further out are typical of Gorseinon. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a glazed rear extension in Gorseinon 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.
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 Gorseinon
Close by, we work in Llanelli, about 5.2 miles away, and Swansea, about 5.4 miles away.
- Glazed rear extension in Llanelli
- Glazed rear extension in Swansea
- Glazed rear extension in Clydach
- Glazed rear extension in Ammanford
- Glazed rear extension in Briton Ferry
Other work in Gorseinon:
FAQ
Glazed rear extension questions in Gorseinon
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 Gorseinon free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Will a glass extension be too hot?
Not if it is designed for its orientation, with solar-control glass, shading and ventilation.
Do you handle building control in Gorseinon?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
What postcode areas do you cover around Gorseinon?
Including SA4, and the surrounding Swansea Bay area.
Do I need planning permission for a rear extension in Gorseinon?
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.