Dundonald, County Down
Two-storey rear extension in Dundonald
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We design, get the approvals for and build two-storey rear extensions in Dundonald and the surrounding area, with one contract from the first survey to building control sign-off.
We cover Dundonald (BT16) as part of our County Down work. Two-storey rear extensions suit semi-detached houses in Dundonald 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 Dundonald?
Guide prices for a two-storey rear extension in Dundonald 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 |
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 two-storey rear extension in Dundonald?
Whether your two-storey rear extension in Dundonald 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. 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 Dundonald like to extend?
Semis and detached houses are typical of Dundonald, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a two-storey rear extension in Dundonald 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.
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.
Two-storey rear extensions near Dundonald
Close by, we work in Holywood, about 3.4 miles away, and Castlereagh, about 3.7 miles away.
- Two-storey rear extension in Holywood
- Two-storey rear extension in Castlereagh
- Two-storey rear extension in Newtownards
- Two-storey rear extension in Belfast
- Two-storey rear extension in Newtownabbey
Other work in Dundonald:
FAQ
Two-storey rear extension questions in Dundonald
Can you match the brick or stone on my Dundonald house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How much does a two-storey rear extension cost in Dundonald?
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.
Can it be built on a terraced house?
Sometimes, but the upper floor is harder to get through planning on a terrace because of the effect on neighbours. A single-storey extension with a loft conversion is often an easier route.
Do I need planning permission for a rear extension in Dundonald?
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.
Is the site visit in Dundonald free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
How long does a rear extension take to build in Dundonald?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.