Two-storey extensions in Belfast
Homeowners in Belfast can use us for the whole project or just the drawings and approvals. Start with a free visit.
Belfast at a glance
- Postcode districts
- BT1, BT2, BT3, BT7, BT9, BT11 and nearby districts
- Area
- County Antrim, Northern Ireland
- Price region
- Northern Ireland
- Nearest towns
- Castlereagh (2.3 miles), Newtownabbey (4.4 miles), Holywood (5 miles), Dundonald (5.1 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.
We cover Belfast (BT1, BT2, BT3, BT7, BT9, BT11 and nearby districts) and the places around it, including Castlereagh (2.3 miles), Newtownabbey (4.4 miles) and Holywood.
Extensions available in Belfast
Two-storey rear extensions
Belfast guide price from £49,500, Standard spec.
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Two-storey side extensions
Design, approvals and build for Belfast homes. Guide from £76,000.
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Two-storey wraparound extensions
Our Northern Ireland guide starts at £106,000 for this type.
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Part single, part two-storey extensions
Belfast guide price from £63,500, Standard spec.
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Extensions over a garage
Design, approvals and build for Belfast homes. Guide from £27,500.
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First-floor extensions
From £22,000 in Belfast. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Belfast homes. Guide from £49,500.
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Two-storey extensions for detached houses
Belfast guide price from £76,000, Standard spec.
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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
Belfast guide price from £49,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Belfast we also design annexes, home offices and bedrooms over garages.
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 Belfast
Belfast 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 Belfast
Do you cover Belfast?
Yes. We cover Belfast (BT1, BT2, BT3, BT7, BT9, BT11 and nearby districts) and the surrounding area, including Castlereagh and Newtownabbey. The first site visit is free.
What does a two-storey extension cost in Belfast?
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 Belfast do you cover?
Everywhere around it, including Castlereagh (2.3 miles), Newtownabbey (4.4 miles) and Holywood (5 miles), and the rest of County Antrim.