Two-storey extensions in Derry
We design, get approval for and build two-storey extensions in Derry and the surrounding area. Choose the type of extension below or book a free site visit.
Derry at a glance
- Postcode districts
- BT48
- Area
- County Londonderry, Northern Ireland
- Price region
- Northern Ireland
- Nearest towns
- New Buildings (3.1 miles), Culmore (4 miles), Eglinton (5.2 miles), Strabane (13.6 miles)
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Most others need planning permission.
Around Derry we also work in New Buildings, Culmore and Eglinton, and across the rest of County Londonderry. Postcode district in and near Derry: BT48.
Extensions available in Derry
Two-storey rear extensions
Design, approvals and build for Derry homes. Guide from £49,500.
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Two-storey side extensions
Design, approvals and build for Derry homes. Guide from £76,000.
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Two-storey wraparound extensions
For homes in Derry: typical guide from £106,000.
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Part single, part two-storey extensions
From £63,500 in Derry. Free visit to firm it up.
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Extensions over a garage
Our Northern Ireland guide starts at £27,500 for this type.
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First-floor extensions
Our Northern Ireland guide starts at £22,000 for this type.
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Two-storey extensions for semi-detached houses
Our Northern Ireland guide starts at £49,500 for this type.
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Two-storey extensions for detached houses
For homes in Derry: typical guide from £76,000.
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Kitchen extensions with bedrooms above
Design, approvals and build for Derry homes. Guide from £49,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Guide from £49,500 (plus en-suite) in Derry, including VAT.
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Derry we measure distances to every boundary before suggesting a type.
Also available in County Londonderry
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Design and build two-storey extensions
Rules for Derry
Derry is in Northern Ireland. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Most others need planning permission. Planning application for works to a house: £347. Councils aim to decide local applications within an average of 15 weeks; many take longer.
The full Northern Ireland rules explained
Questions about extensions in Derry
Do you cover Derry?
Yes. We cover Derry (BT48) and the surrounding area, including New Buildings and Culmore. The first site visit is free.
What does a two-storey extension cost in Derry?
Using our Northern Ireland guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £49,500–£66,500 including VAT. An extension over a garage is about £27,500–£40,500.
Which other places near Derry do you cover?
Everywhere around it, including New Buildings (3.1 miles), Culmore (4 miles) and Eglinton (5.2 miles), and the rest of County Londonderry.