Two-storey extensions in Blackwood
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Blackwood.
Blackwood at a glance
- Postcode districts
- NP12
- Area
- Gwent, Wales
- Price region
- Wales
- Nearest towns
- Bargoed (1.5 miles), Hengoed (1.6 miles), Gelligaer (2.1 miles), Crumlin (Gwent) (3.2 miles)
- Distance to Newport (Gwent)
- about 10.5 miles
- Approvals
- Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development.
Around Blackwood we also work in Bargoed, Hengoed and Gelligaer, and across the rest of Gwent. Postcode district in and near Blackwood: NP12.
Extensions available in Blackwood

Two-storey rear extensions
Blackwood guide price from £51,500, Standard spec.
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Two-storey side extensions
Design, approvals and build for Blackwood homes. Guide from £79,000.
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Two-storey wraparound extensions
Our Wales guide starts at £111,000 for this type.
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Part single, part two-storey extensions
Our Wales guide starts at £66,000 for this type.
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Extensions over a garage
Design, approvals and build for Blackwood homes. Guide from £29,000.
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First-floor extensions
Blackwood guide price from £23,000, Standard spec.
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Two-storey extensions for semi-detached houses
For homes in Blackwood: typical guide from £51,500.
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Two-storey extensions for detached houses
Guide from £79,000 in Blackwood, including VAT.
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Kitchen extensions with bedrooms above
Guide from £51,500 (before kitchen units) in Blackwood, including VAT.
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Extra bedroom and en-suite extensions
Blackwood guide price from £51,500 (plus en-suite), Standard spec.
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Gwent, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Gwent
- 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
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Blackwood
Blackwood is in Wales. Two-storey rear: ground floor up to 4 m, first floor up to 3 m and 10.5 m from the rear boundary. Some two-storey side extensions can be permitted development. Householder planning application: £585. Councils normally decide householder applications within 8 weeks.
The full Wales rules explained
Questions about extensions in Blackwood
Do you cover Blackwood?
Yes. We cover Blackwood (NP12) and the surrounding area, including Bargoed and Hengoed. The first site visit is free.
What does a two-storey extension cost in Blackwood?
Using our Wales 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 £51,500–£69,500 including VAT. An extension over a garage is about £29,000–£42,000.
Which other places near Blackwood do you cover?
Everywhere around it, including Bargoed (1.5 miles), Hengoed (1.6 miles) and Gelligaer (2.1 miles), and the rest of Gwent.