Portstewart, County Londonderry
Two-storey rear extension in Portstewart
We plan and build two-storey rear extensions for homeowners in Portstewart. 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.
Portstewart sits in County Londonderry, with postcode districts including BT55. Two-storey rear extensions suit semi-detached houses in Portstewart 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 Portstewart?
A two-storey rear extension in Portstewart is priced at £1,570–£2,350 per square metre including VAT as a guide, before kitchen fit-out and fees. 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 |
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 two-storey rear extension in Portstewart?
The planning route for a two-storey rear extension in Portstewart is set by Northern Ireland's householder rules and your council.
In Northern Ireland a rear extension of more than one storey can be permitted development if it projects no more than 3 metres and stays at least 7 metres from the rear boundary. Two-storey extensions in conservation areas, and most larger schemes, need planning permission from 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 Portstewart like to extend?
Portstewart 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 Portstewart comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
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 Portstewart
From Portstewart, the nearest places we also cover are Coleraine (3.8 miles) and Limavady (13.0 miles).
- Two-storey rear extension in Coleraine
- Two-storey rear extension in Limavady
- Two-storey rear extension in Derry~Londonderry
- Two-storey rear extension in Ballymena
- Two-storey rear extension in Magherafelt
Other work in Portstewart:
FAQ
Two-storey rear extension questions in Portstewart
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.
How much does a two-storey rear extension cost in Portstewart?
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 I add an en-suite upstairs?
Yes. We plan the soil pipe route early so the bathroom sits where drainage works without boxing through the room below.
Do I need planning permission for a rear extension in Portstewart?
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.
Can you match the brick or stone on my Portstewart house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.