Two-storey extensions in Blaenavon
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Blaenavon.
Blaenavon at a glance
- Postcode districts
- NP13
- Area
- Gwent, Wales
- Price region
- Wales
- Nearest towns
- Gilwern (3.5 miles), Abertillery (3.7 miles), Abergavenny (4.4 miles), Brynmawr (4.6 miles)
- Distance to Newport (Gwent)
- about 13.4 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 Blaenavon we also work in Gilwern, Abertillery and Abergavenny, and across the rest of Gwent. Postcode district in and near Blaenavon: NP13.
Extensions available in Blaenavon

Two-storey rear extensions
Our Wales guide starts at £51,500 for this type.
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Two-storey side extensions
Guide from £79,000 in Blaenavon, including VAT.
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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
Design, approvals and build for Blaenavon homes. Guide from £66,000.
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Extensions over a garage
Design, approvals and build for Blaenavon homes. Guide from £29,000.
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First-floor extensions
For homes in Blaenavon: typical guide from £23,000.
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Two-storey extensions for semi-detached houses
Our Wales guide starts at £51,500 for this type.
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Two-storey extensions for detached houses
From £79,000 in Blaenavon. Free visit to firm it up.
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Kitchen extensions with bedrooms above
From £51,500 (before kitchen units) in Blaenavon. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Blaenavon homes. Guide from £51,500 (plus en-suite).
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 Blaenavon
Blaenavon 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 Blaenavon
Do you cover Blaenavon?
Yes. We cover Blaenavon (NP13) and the surrounding area, including Gilwern and Abertillery. The first site visit is free.
What does a two-storey extension cost in Blaenavon?
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 Blaenavon do you cover?
Everywhere around it, including Gilwern (3.5 miles), Abertillery (3.7 miles) and Abergavenny (4.4 miles), and the rest of Gwent.