Covering Bangor, Gwynedd and Anglesey
Alongside Bangor, Gwynedd and Anglesey, we also cover Llangefni, Caernarfon (8 miles to the south-west) and Colwyn Bay.
Homes in Gwynedd and Anglesey
Across Wales you find valley terraces, coastal towns, rural stone houses and newer estates, so access, slopes and local materials all feature in the design.
What goes into a double-storey extension?
A double-storey extension adds new rooms on both the ground and first floor in one build, typically a larger kitchen or living space downstairs and an extra bedroom or bathroom above. Because the roof and foundations are shared, the cost per square metre is usually lower than a single-storey extension.
- Structural engineer’s design and calculations
- Foundations, steelwork, brick and block walls, roof
- Windows, insulation, plastering, electrics and plumbing
How much should I budget for a double-storey extension?
Guide prices for double-storey extensions, including VAT where it applies. Your fixed price is confirmed in writing after the survey.
| Double-storey extensions | Guide price incl. VAT |
|---|---|
| Standard specification | £2,400 to £2,900 per m² |
| Good specification | £2,900 to £3,400 per m² |
| High specification | £3,400 to £3,850 per m² |
Do you need permission for a double-storey extension in Bangor, Gwynedd and Anglesey?
Welsh projects need planning clearance from the council under Welsh rules, building regulations approval under the Welsh approved documents, and party wall notices where the work affects a neighbour’s wall or foundations.
Most two-storey extensions in Wales need householder planning permission from the council.
What should I think about before starting?
- The new roof is tied into the old one, so roof tiles and ridge details need to match.
- The first-floor link can mean moving a bathroom or reshaping the landing.
From first call to completion
- Send us the details. Give us a postcode, a rough idea of size and some photos, by phone, form or the guide price tool.
- Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
- Design and fixed price. You get drawings and a written price for the agreed specification before anything is ordered.
- We build it. Work follows an agreed programme, with inspections at each stage and a final sign-off.
Double-storey extensions: common questions
How long does a two-storey extension take?
Around 14 to 24 weeks on site, plus the planning period before that.
Will we need to move out?
Most people stay. The noisiest stage is when we break through into the existing first floor, which we plan for a short window.
Do you work in Bangor, Gwynedd and Anglesey?
Yes. Bangor, Gwynedd and Anglesey is within our coverage for double-storey extensions, along with nearby Llangefni and Caernarfon.
Double-storey extensions near Bangor, Gwynedd and Anglesey
- Double-storey extensions in Llangefni
- Double-storey extensions in Caernarfon
- Double-storey extensions in Colwyn Bay
- Double-storey extensions in Holyhead
Learn more about double-storey extensions, or see every project we cover in Bangor.