Colwyn Bay, North Wales
Terraced house rear extension in Colwyn Bay
Terraced house rear extension in Colwyn Bay: rear and side return extensions for terraces, with access through the house and two neighbours. We measure the house, show you what the rules allow, price it in writing and build it.
Colwyn Bay is covered from our North Wales round, including LL28, LL29 and LL31. On a Colwyn Bay terrace both neighbours usually need party wall notices or agreement, so we talk to them early.
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 terraced house rear extension cost in Colwyn Bay?
Guide prices for a terraced house rear extension in Colwyn Bay start from our Wales rate of £1,910–£3,070 per square metre, including VAT. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4.5 m deep (13.5 m²) | £25,500–£41,500 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£55,000 |
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 terraced house rear extension in Colwyn Bay?
Here is how the rules in Wales apply to a terraced house rear extension in Colwyn Bay.
In Wales a single-storey rear extension can often be permitted development if it projects no more than 4 metres beyond the rear wall and is no more than 4 metres high. Wales has no prior approval route for deeper extensions, so anything bigger needs a householder planning application.
The Party Wall etc. Act 1996 also applies in Wales: two months' notice for work to a shared wall and one month for foundations dug close to a neighbour's building.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Colwyn Bay like to extend?
Colwyn Bay 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 terraced house rear extension in Colwyn Bay comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
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.
Terraced house rear extensions near Colwyn Bay
Neighbouring places we cover include Llandudno (4.8 miles) and Abergele (6.0 miles).
- Terraced house rear extension in Llandudno
- Terraced house rear extension in Abergele
- Terraced house rear extension in Rhyl
- Terraced house rear extension in Prestatyn
- Terraced house rear extension in Bangor
Other work in Colwyn Bay:
FAQ
Terraced house rear extension questions in Colwyn Bay
What postcode areas do you cover around Colwyn Bay?
Including LL28, LL29 and LL31, and the surrounding North Wales area.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
Can a terrace have a two-storey rear extension?
It is possible but harder to get through planning because of the effect on both neighbours.
Is the site visit in Colwyn Bay free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
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.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.