Portstewart, County Londonderry
Glazed rear extension in Portstewart
We plan and build glazed and glass-box rear extensions for homeowners in Portstewart. 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.
Portstewart and its postcode districts BT55 are part of our County Londonderry coverage. Glass-led rear extensions in Portstewart are planned around which way the garden faces, because that decides the glass specification.
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 Portstewart?
Guide prices for a glazed rear extension in Portstewart 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 |
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 Portstewart?
Here is how the rules in Northern Ireland apply to a glazed rear extension in Portstewart.
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. 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 Portstewart like to extend?
Semis and detached houses are typical of Portstewart, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a glazed rear extension in Portstewart 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check or planning application, then building control drawings to the Northern Ireland Technical Booklets and structural calculations, plus a written agreement with neighbours for any shared-wall work.
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 Portstewart
We also build glazed and glass-box rear extensions in nearby Coleraine (3.8 miles) and Limavady (13.0 miles).
- Glazed rear extension in Coleraine
- Glazed rear extension in Limavady
- Glazed rear extension in Derry~Londonderry
- Glazed rear extension in Ballymena
- Glazed rear extension in Magherafelt
Other work in Portstewart:
FAQ
Glazed rear extension questions in Portstewart
Do I need a party wall agreement?
Northern Ireland has no Party Wall Act; we agree any shared-wall work with your neighbour in writing.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Sliding or bifold doors?
Sliders give bigger panes and slimmer sightlines; bifolds open the whole width. Our guide compares them.
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.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
What postcode areas do you cover around Portstewart?
Including BT55, and the surrounding County Londonderry area.