Two-storey extensions in Antrim
Planning a bigger home in Antrim? Compare extension types and guide prices below, then book a free site visit.
Antrim at a glance
- Postcode districts
- BT41
- Area
- County Antrim, Northern Ireland
- Price region
- Northern Ireland
- Nearest towns
- Randalstown (4.2 miles), Crumlin (County Antrim) (6.7 miles), Ballyclare (8.8 miles), Ballymena (10.4 miles)
- Distance to Belfast
- about 14.1 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 Antrim we also work in Randalstown, Crumlin (County Antrim) and Ballyclare, and across the rest of County Antrim. Postcode district in and near Antrim: BT41.
Extensions available in Antrim
Two-storey rear extensions
Our Northern Ireland guide starts at £49,500 for this type.
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Two-storey side extensions
For homes in Antrim: typical guide from £76,000.
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Two-storey wraparound extensions
For homes in Antrim: typical guide from £106,000.
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Part single, part two-storey extensions
Design, approvals and build for Antrim homes. Guide from £63,500.
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Extensions over a garage
Design, approvals and build for Antrim homes. Guide from £27,500.
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First-floor extensions
Antrim guide price from £22,000, Standard spec.
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Two-storey extensions for semi-detached houses
Antrim guide price from £49,500, Standard spec.
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Two-storey extensions for detached houses
Antrim guide price from £76,000, Standard spec.
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Kitchen extensions with bedrooms above
Design, approvals and build for Antrim homes. Guide from £49,500 (before kitchen units).
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Extra bedroom and en-suite extensions
Design, approvals and build for Antrim homes. Guide from £49,500 (plus en-suite).
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 Antrim we measure distances to every boundary before suggesting a type.
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 Antrim
Antrim 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 Antrim
Do you cover Antrim?
Yes. We cover Antrim (BT41) and the surrounding area, including Randalstown and Crumlin (County Antrim). The first site visit is free.
What does a two-storey extension cost in Antrim?
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 Antrim do you cover?
Everywhere around it, including Randalstown (4.2 miles), Crumlin (County Antrim) (6.7 miles) and Ballyclare (8.8 miles), and the rest of County Antrim.