Antrim, County Antrim
Two-storey rear extension in Antrim
We plan and build two-storey rear extensions for homeowners in Antrim. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Start with a free site visit, then a written price once the design is agreed.
Antrim sits in County Antrim, with postcode districts including BT41. Two-storey rear extensions suit semi-detached houses in Antrim best, where the extra bedroom matters as much as the bigger kitchen.
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 two-storey rear extension cost in Antrim?
Guide prices for a two-storey rear extension in Antrim start from our Northern Ireland rate of £1,570–£2,350 per square metre, including VAT. Northern Ireland prices are the lowest in our range.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £47,000–£70,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £75,000–£113,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a two-storey rear extension in Antrim?
Whether your two-storey rear extension in Antrim needs a planning application depends on its size, your house and any local restrictions.
Northern Ireland's 2015 Order allows a two-storey rear extension of up to 3 metres where at least 7 metres is left to the rear boundary. Anything larger, or in a conservation area, needs a planning application to the council.
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 Antrim like to extend?
Antrim has terraces near the centre, semis on the edges and many detached houses and bungalows in the surrounding countryside, where plots are often generous.
How a two-storey rear extension in Antrim 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.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for council building control.
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.
Two-storey rear extensions near Antrim
From Antrim, the nearest places we also cover are Ballymena (10.4 miles) and Newtownabbey (12.7 miles).
- Two-storey rear extension in Ballymena
- Two-storey rear extension in Newtownabbey
- Two-storey rear extension in Belfast
- Two-storey rear extension in Lisburn
- Two-storey rear extension in Magherafelt
Other work in Antrim:
FAQ
Two-storey rear extension questions in Antrim
How long does a rear extension take to build in Antrim?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
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 I need planning permission for a rear extension in Antrim?
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.
How much does a two-storey rear extension cost in Antrim?
As a guide, £1,570–£2,350 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £47,000–£70,500 at that rate. Your written price follows the survey.