Holywood, County Down
Glazed rear extension in Holywood
For homes in Holywood, a glazed rear extension is often the simplest way to gain space without moving. Full-height glass, slim frames and big rooflights for the most open rear room. We take it from survey to completion certificate.
Holywood and its postcode districts BT18 are part of our County Down coverage. If your garden in Holywood 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 Holywood?
For Holywood we work from the Northern Ireland rate: £2,440–£4,180 per square metre of new floor, including VAT, standard specification. 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a glazed rear extension in Holywood?
Here is how the rules in Northern Ireland apply to a glazed rear extension in Holywood.
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. 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 Holywood like to extend?
Semis and detached houses are typical of Holywood, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a glazed rear extension in Holywood 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
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.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Glazed rear extensions near Holywood
We also build glazed and glass-box rear extensions in nearby Dundonald (3.4 miles) and Newtownabbey (3.7 miles).
- Glazed rear extension in Dundonald
- Glazed rear extension in Newtownabbey
- Glazed rear extension in Belfast
- Glazed rear extension in Castlereagh
- Glazed rear extension in Carrickfergus
Other work in Holywood:
FAQ
Glazed rear extension questions in Holywood
Do I need planning permission for a rear extension in Holywood?
Often not for a single-storey rear extension of up to 3 metres (4 metres detached) under Northern Ireland's permitted development rules, outside conservation areas.
What postcode areas do you cover around Holywood?
Including BT18, and the surrounding County Down area.
Can I have a level threshold?
Yes, with a drainage channel outside the doors and the slab set to the patio level.
How long does a rear extension take to build in Holywood?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
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.