Two-storey extensions in Gilwern
Need more room in Gilwern? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Gilwern at a glance
- Postcode districts
- NP8
- Area
- Powys, Wales
- Price region
- Wales
- Nearest towns
- Abergavenny (3.3 miles), Blaenavon (3.5 miles), Brynmawr (4.2 miles), Ebbw Vale (5.9 miles)
- Distance to Newtown
- about 48.6 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.
We cover Gilwern (NP8) and the places around it, including Abergavenny (3.3 miles), Blaenavon (3.5 miles) and Brynmawr.
Extensions available in Gilwern

Two-storey rear extensions
For homes in Gilwern: typical guide from £51,500.
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Two-storey side extensions
Guide from £79,000 in Gilwern, including VAT.
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Two-storey wraparound extensions
Guide from £111,000 in Gilwern, including VAT.
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Part single, part two-storey extensions
Gilwern guide price from £66,000, Standard spec.
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Extensions over a garage
Guide from £29,000 in Gilwern, including VAT.
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First-floor extensions
Our Wales guide starts at £23,000 for this type.
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Two-storey extensions for semi-detached houses
From £51,500 in Gilwern. Free visit to firm it up.
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Two-storey extensions for detached houses
For homes in Gilwern: typical guide from £79,000.
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Kitchen extensions with bedrooms above
Design, approvals and build for Gilwern homes. Guide from £51,500 (before kitchen units).
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Extra bedroom and en-suite extensions
From £51,500 (plus en-suite) in Gilwern. Free visit to firm it up.
Learn moreWhich type suits your house?
Which type suits your house in Gilwern depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Powys
- 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 Gilwern
Gilwern 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 Gilwern
Do you cover Gilwern?
Yes. We cover Gilwern (NP8) and the surrounding area, including Abergavenny and Blaenavon. The first site visit is free.
What does a two-storey extension cost in Gilwern?
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 Gilwern do you cover?
Everywhere around it, including Abergavenny (3.3 miles), Blaenavon (3.5 miles) and Brynmawr (4.2 miles), and the rest of Powys.