Two-storey extensions in Castlereagh
Need more room in Castlereagh? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Castlereagh at a glance
- Postcode districts
- BT4, BT5 and BT6
- Area
- County Antrim, Northern Ireland
- Price region
- Northern Ireland
- Nearest towns
- Belfast (2.3 miles), Dundonald (3.7 miles), Carryduff (3.8 miles), Holywood (5.1 miles)
- Distance to Belfast
- about 2.3 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 Castlereagh (BT4, BT5 and BT6) and the places around it, including Belfast (2.3 miles), Dundonald (3.7 miles) and Carryduff.
Extensions available in Castlereagh
Two-storey rear extensions
Guide from £49,500 in Castlereagh, including VAT.
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Two-storey side extensions
Design, approvals and build for Castlereagh homes. Guide from £76,000.
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Two-storey wraparound extensions
From £106,000 in Castlereagh. Free visit to firm it up.
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Part single, part two-storey extensions
Guide from £63,500 in Castlereagh, including VAT.
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Extensions over a garage
Design, approvals and build for Castlereagh homes. Guide from £27,500.
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First-floor extensions
Castlereagh guide price from £22,000, Standard spec.
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Two-storey extensions for semi-detached houses
Castlereagh guide price from £49,500, Standard spec.
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Two-storey extensions for detached houses
From £76,000 in Castlereagh. Free visit to firm it up.
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Kitchen extensions with bedrooms above
From £49,500 (before kitchen units) in Castlereagh. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Castlereagh 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 Castlereagh 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 Castlereagh
Castlereagh 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 Castlereagh
Do you cover Castlereagh?
Yes. We cover Castlereagh (BT4, BT5 and BT6) and the surrounding area, including Belfast and Dundonald. The first site visit is free.
What does a two-storey extension cost in Castlereagh?
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 Castlereagh do you cover?
Everywhere around it, including Belfast (2.3 miles), Dundonald (3.7 miles) and Carryduff (3.8 miles), and the rest of County Antrim.