Bangor, North Wales
Two-storey rear extension in Bangor
A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. If you live in Bangor and want to know what a two-storey rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Bangor sits in North Wales, with postcode districts including LL58 and LL59. In Bangor, a two-storey rear extension is worth comparing with the cost of moving once stamp duty, agents' and legal fees are counted.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a two-storey rear extension cost in Bangor?
For Bangor we work from the Wales rate: £1,670–£2,510 per square metre of new floor, including VAT, standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £50,000–£75,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £80,500–£120,500 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a two-storey rear extension in Bangor?
Planning for a two-storey rear extension in Bangor follows the Welsh householder rules.
In Wales a rear extension of more than one storey can be permitted development if the ground floor projects no more than 4 metres and the upper floor no more than 3 metres, with at least 10.5 metres to the rear boundary. It is not permitted development in conservation areas, National Parks or National Landscapes, so many double-storey schemes need a householder application.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Bangor like to extend?
Bangor has Victorian terraces near the centre and semis further out. Welsh permitted development allows up to 4 metres at the rear for many houses.
How a two-storey rear extension in Bangor comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Approvals
Permitted development check or householder planning application, then Building Regulations drawings to the Welsh Approved Documents and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Two-storey rear extensions near Bangor
Neighbouring places we cover include Llandudno (14.0 miles) and Colwyn Bay (17.3 miles).
- Two-storey rear extension in Llandudno
- Two-storey rear extension in Colwyn Bay
- Two-storey rear extension in Holyhead
- Two-storey rear extension in Abergele
- Two-storey rear extension in Rhyl
Other work in Bangor:
FAQ
Two-storey rear extension questions in Bangor
How much does a two-storey rear extension cost in Bangor?
As a guide, £1,670–£2,510 per square metre including VAT for a standard specification. For example, 3 m × 5 m footprint, two floors (30 m²): about £50,000–£75,500 at that rate. Your written price follows the survey.
Is the site visit in Bangor free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Does a two-storey rear extension need planning permission?
Almost always. England and Northern Ireland allow 3 metres without an application only if at least 7 metres remains to the rear boundary; Wales and Scotland are similar or stricter.
Do I need a party wall agreement?
In Wales, usually yes if the extension is on or near a shared boundary or close to a neighbour's foundations. We serve the notices.
What postcode areas do you cover around Bangor?
Including LL58 and LL59, and the surrounding North Wales area.
Do I need planning permission for a rear extension in Bangor?
Often not for a single-storey rear extension of up to 4 metres under Welsh permitted development. Wales has no prior approval route for deeper extensions.