Derry~Londonderry, County Londonderry
Two-storey rear extension in Derry~Londonderry
For homes in Derry~Londonderry, a two-storey rear extension is often the simplest way to gain space without moving. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. We take it from survey to completion certificate.
Derry~Londonderry and its postcode districts BT48 are part of our County Londonderry coverage. Two-storey rear extensions suit semi-detached houses in Derry~Londonderry 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 Derry~Londonderry?
Guide prices for a two-storey rear extension in Derry~Londonderry 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 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a two-storey rear extension in Derry~Londonderry?
Planning for a two-storey rear extension in Derry~Londonderry follows the Northern Irish householder rules.
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 Derry~Londonderry like to extend?
Semis and detached houses are typical of Derry~Londonderry, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a two-storey rear extension in Derry~Londonderry 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.
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.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Two-storey rear extensions near Derry~Londonderry
Neighbouring places we cover include Strabane (13.6 miles) and Limavady (14.7 miles).
- Two-storey rear extension in Strabane
- Two-storey rear extension in Limavady
- Two-storey rear extension in Portstewart
- Two-storey rear extension in Coleraine
- Two-storey rear extension in Omagh
Other work in Derry~Londonderry:
FAQ
Two-storey rear extension questions in Derry~Londonderry
Can you match the brick or stone on my Derry~Londonderry house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Do you handle building control in Derry~Londonderry?
Yes. We apply to the council's building control team and hand over the completion certificate.
What is the 45-degree rule?
Many councils check that a two-storey extension does not cross a 45-degree line drawn from the nearest habitable window of the neighbouring house. We test it at the first drawing.
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.
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.
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.