County Antrim
Glazed and glass-box rear extensions in County Antrim
Full-height glass, slim frames and big rooflights for the most open rear room. Rear extensions in County Antrim: we cover 7 towns including Belfast, Lisburn and Newtownabbey, with design, approvals and the build under one contract.
If your garden in Belfast faces south, expect us to talk about overhangs and solar-control glass before frame colours. Semis and detached houses are typical of County Antrim, and many have room for a rear extension within Northern Ireland's permitted development limits.
How much does a glazed rear extension cost in County Antrim?
Guide prices for a glazed rear extension in County Antrim start from our Northern Ireland rate of £2,440–£4,180 per square metre, including VAT. Northern Ireland prices are the lowest in our range.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £29,000–£50,000 |
| 4 m wide × 6 m deep (24 m²) | £58,500–£100,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission in County Antrim?
Northern Ireland's permitted development rules allow a single-storey rear extension of 3 metres on terraced and semi-detached houses and 4 metres on detached houses, with a 4 metre height limit. Listed buildings, conservation areas and houses with removed rights need planning permission from the council.
Insulation and glazing follow Technical Booklet F1 in Northern Ireland, checked by council building control.
Conservation areas, Areas of Outstanding Natural Beauty and listed buildings restrict permitted development in Northern Ireland.
Where in County Antrim do we work?
FAQ
Questions people ask
Will a glass extension be too hot?
Not if it is designed for its orientation, with solar-control glass, shading and ventilation.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
Can I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
Do you cover all of County Antrim?
We cover 7 towns and districts in County Antrim, including Belfast, Lisburn and Newtownabbey.
Who builds the extension?
Vetted building teams working under contract to us; your contract is with S&K Property Investments and Improvement Ltd.