Llantwit Major, Cardiff and the Vale
Glazed rear extension in Llantwit Major
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Llantwit Major and want to know what a glazed rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Llantwit Major is covered from our Cardiff and the Vale round, including CF61. If your garden in Llantwit Major 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 Llantwit Major?
A glazed rear extension in Llantwit Major is priced at £2,600–£4,460 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a glazed rear extension in Llantwit Major?
Planning for a glazed rear extension in Llantwit Major follows the Welsh householder rules.
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 Llantwit Major like to extend?
Llantwit Major has Victorian terraces near the centre and semis further out. Welsh permitted development allows up to 4 metres at the rear for many houses.
How a glazed rear extension in Llantwit Major 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 Llantwit Major
Close by, we work in Bridgend, about 7.6 miles away, and Coity, about 8.2 miles away.
- Glazed rear extension in Bridgend
- Glazed rear extension in Coity
- Glazed rear extension in Barry
- Glazed rear extension in Aberkenfig
- Glazed rear extension in Llantrisant
Other work in Llantwit Major:
FAQ
Glazed rear extension questions in Llantwit Major
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.
Do you handle building control in Llantwit Major?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
Is the site visit in Llantwit Major free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.
How much does a glazed rear extension cost in Llantwit Major?
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.