Colwyn Bay, North Wales
Glazed rear extension in Colwyn Bay
Full-height glass, slim frames and big rooflights for the most open rear room. If you live in Colwyn Bay and want to know what a glazed rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Colwyn Bay (LL28, LL29 and LL31) as part of our North Wales work. If your garden in Colwyn Bay faces south, expect us to talk about overhangs and solar-control glass before frame colours.
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 glazed rear extension cost in Colwyn Bay?
In Colwyn Bay, our guide for a glazed rear extension is £2,600–£4,460 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 |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £31,000–£53,500 |
| 4 m wide × 6 m deep (24 m²) | £62,500–£107,000 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a glazed rear extension in Colwyn Bay?
Planning for a glazed rear extension in Colwyn Bay follows the Welsh householder rules.
Welsh permitted development allows a single-storey rear extension of up to 4 metres in depth and 4 metres in height, subject to boundary and garden-coverage limits. There is no larger-extension prior approval scheme in Wales.
Wales has its own Approved Document L, with targets for walls, roofs, floors and glazing similar to but not identical with England's. Heavily glazed designs are checked with a calculation.
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?
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 glazed rear extension in Colwyn Bay comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Glazed rear extensions near Colwyn Bay
Neighbouring places we cover include Llandudno (4.8 miles) and Abergele (6.0 miles).
- Glazed rear extension in Llandudno
- Glazed rear extension in Abergele
- Glazed rear extension in Rhyl
- Glazed rear extension in Prestatyn
- Glazed rear extension in Bangor
Other work in Colwyn Bay:
FAQ
Glazed rear extension questions in Colwyn Bay
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.
What postcode areas do you cover around Colwyn Bay?
Including LL28, LL29 and LL31, and the surrounding North Wales area.
Does glass need planning permission?
The same rules apply as any rear extension; glass does not change the depth or height limits.
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.
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.