Newtownabbey, County Antrim
Single-storey rear extension in Newtownabbey
Ground-floor space across the back of the house, usually for a kitchen, dining or family room. We design, get the approvals for and build single-storey rear extensions in Newtownabbey and the surrounding area, with one contract from the first survey to building control sign-off.
Newtownabbey sits in County Antrim, with postcode districts including BT36 and BT37. A depth of 3 to 4 metres keeps many single-storey rear extensions in Newtownabbey within permitted development, subject to the house's planning history.
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 single-storey rear extension cost in Newtownabbey?
For Newtownabbey we work from the Northern Ireland rate: £1,650–£2,700 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) | £20,000–£32,500 |
| 4 m wide × 5 m deep (20 m²) | £33,000–£54,000 |
| 4 m wide × 6 m deep (24 m²) | £39,500–£64,500 |
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 single-storey rear extension in Newtownabbey?
Whether your single-storey rear extension in Newtownabbey needs a planning application depends on its size, your house and any local restrictions.
In Northern Ireland the Planning (General Permitted Development) Order (Northern Ireland) 2015 allows a single-storey rear extension of up to 3 metres on an attached house or 4 metres on a detached house, no higher than 4 metres, with eaves no higher than 3 metres within 2 metres of a boundary. Building control approval from the council is still required.
Northern Ireland has no larger-extension prior approval route; anything beyond permitted development needs a planning application.
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 Newtownabbey like to extend?
Semis and detached houses are typical of Newtownabbey, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a single-storey rear extension in Newtownabbey comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Paperwork handled
Planning or permitted development, building control approval, structural design and neighbour agreements are all handled by us.
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.
Single-storey rear extensions near Newtownabbey
Close by, we work in Holywood, about 3.7 miles away, and Belfast, about 4.4 miles away.
- Single-storey rear extension in Holywood
- Single-storey rear extension in Belfast
- Single-storey rear extension in Carrickfergus
- Single-storey rear extension in Castlereagh
- Single-storey rear extension in Dundonald
Other work in Newtownabbey:
FAQ
Single-storey rear extension questions in Newtownabbey
Can you match the brick or stone on my Newtownabbey house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.
Will the extension make the room behind it dark?
Not if it is designed well. Rooflights or a lantern over the old back room, and a wide opening into it, keep daylight reaching the middle of the house.
How long does a rear extension take to build in Newtownabbey?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
What postcode areas do you cover around Newtownabbey?
Including BT36 and BT37, and the surrounding County Antrim area.
How much does a single-storey rear extension cost in Newtownabbey?
As a guide, £1,650–£2,700 per square metre including VAT for a standard specification. For example, 3 m wide × 4 m deep (12 m²): about £20,000–£32,500 at that rate. Your written price follows the survey.