Two-storey extensions in Ballymoney
Planning a bigger home in Ballymoney? Compare extension types and guide prices below, then book a free site visit.
Ballymoney at a glance
- Postcode districts
- BT53
- Area
- County Antrim, Northern Ireland
- Price region
- Northern Ireland
- Nearest towns
- Coleraine (7.5 miles), Portrush (10.2 miles), Portstewart (11.1 miles), Ballycastle (14 miles)
- Distance to Belfast
- about 40.2 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.
We cover Ballymoney (BT53) and the places around it, including Coleraine (7.5 miles), Portrush (10.2 miles) and Portstewart.
Extensions available in Ballymoney

Two-storey rear extensions
Design, approvals and build for Ballymoney homes. Guide from £49,500.
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Two-storey side extensions
Our Northern Ireland guide starts at £76,000 for this type.
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Two-storey wraparound extensions
For homes in Ballymoney: typical guide from £106,000.
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Part single, part two-storey extensions
From £63,500 in Ballymoney. Free visit to firm it up.
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Extensions over a garage
From £27,500 in Ballymoney. Free visit to firm it up.
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First-floor extensions
For homes in Ballymoney: typical guide from £22,000.
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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 Ballymoney: typical guide from £76,000.
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Kitchen extensions with bedrooms above
Our Northern Ireland guide starts at £49,500 (before kitchen units) for this type.
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Extra bedroom and en-suite extensions
For homes in Ballymoney: typical guide from £49,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
Also available in County Antrim
- 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 Ballymoney
Ballymoney 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 Ballymoney
Do you cover Ballymoney?
Yes. We cover Ballymoney (BT53) and the surrounding area, including Coleraine and Portrush. The first site visit is free.
What does a two-storey extension cost in Ballymoney?
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 Ballymoney do you cover?
Everywhere around it, including Coleraine (7.5 miles), Portrush (10.2 miles) and Portstewart (11.1 miles), and the rest of County Antrim.