Colwyn Bay, North Wales
Side return extension in Colwyn Bay
Infilling the narrow passage beside a Victorian or Edwardian back addition. We design, get the approvals for and build side return extensions in Colwyn Bay and the surrounding area, with one contract from the first survey to building control sign-off.
Colwyn Bay is covered from our North Wales round, including LL28, LL29 and LL31. Side returns suit the Victorian and Edwardian terraces found across parts of North Wales, where the kitchen sits in a narrow back addition.
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 side return extension cost in Colwyn Bay?
In Colwyn Bay, our guide for a side return extension is £2,140–£3,530 per square metre including VAT for a standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £25,500–£42,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £37,500–£62,000 |
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 side return extension in Colwyn Bay?
Planning for a side return extension in Colwyn Bay follows the Welsh householder rules.
Welsh side-extension rules limit a single-storey side addition to 4 metres high and a 50% increase in the width of the original house, with tighter limits in conservation areas. Wraparounds usually need a planning application.
In Wales, as in England, the Party Wall etc. Act 1996 requires notice to neighbours before work to a shared wall or excavation near their foundations.
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 Colwyn Bay like to extend?
Older terraces near the centre and post-war semis further out are typical of Colwyn Bay. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a side return 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.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Side return extensions near Colwyn Bay
Close by, we work in Llandudno, about 4.8 miles away, and Abergele, about 6.0 miles away.
- Side return extension in Llandudno
- Side return extension in Abergele
- Side return extension in Rhyl
- Side return extension in Prestatyn
- Side return extension in Bangor
Other work in Colwyn Bay:
FAQ
Side return extension questions in Colwyn Bay
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.
How much space does a side return add?
Typically 8 to 18 square metres, enough to turn a galley kitchen into a kitchen-diner with an island.
How long does a rear extension take to build in Colwyn Bay?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
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.