House extensions in Colwyn Bay
Looking to extend your home in Colwyn Bay? Start here: extension types, guide prices for Colwyn Bay, the planning rules that apply and how a project runs.
- Postcode districtsLL28, LL29
- Price regionWales (×0.93)
- Planning rulesWales
- Site visitFree, no obligation
Do extensions in Colwyn Bay need planning permission?
In Wales a single-storey rear extension can usually project up to 4 m beyond the rear wall without a planning application, if it is no more than 4 m high, keeps eaves to 3 m and overall height to 4 m within 2 m of a boundary, and covers no more than half the land around the original house. Wales has no larger home extension prior approval scheme.
In Wales a single-storey side return can fall within permitted development if it stays within the 4 m height limit and the width rules for side extensions. Conservation areas and listed buildings need consent, and the Party Wall Act applies to work on or near a shared wall.
In a conservation area, national park, National Landscape or World Heritage Site the permitted development limits are tighter (no side or two-storey extensions without an application). Listed homes need listed building consent, and if permitted development rights have been removed, any extension needs an application.
Building regulations approval is separate from planning. Wales has its own building regulations and approved documents; the council or a registered building control approver checks the plans, inspects the work and issues a completion certificate.
Applications are decided by the local planning authority (your county or county borough council, or the national park authority).
Popular extension prices in Colwyn Bay
Use these Colwyn Bay guide prices to sense-check a budget; the guide-price tool narrows them to your own size, and the site visit turns them into a written figure.
| Extension type | Example size | Standard spec (inc VAT) |
|---|---|---|
| Extensions over a garage | 12 m² | £23,000 – £30,500 |
| Double-storey extensions | 32 m² | £53,500 – £70,000 |
| Kitchen extensions | 20 m² | £39,000 – £49,500 |
| Conservatory replacement extensions | 14 m² | £27,500 – £36,000 |
| Wraparound extensions | 25 m² | £53,000 – £67,500 |
| Single-storey rear extensions | 20 m² | £38,000 – £48,500 |
| Side return extensions | 11 m² | £24,500 – £31,000 |
Choosing the right extension in Colwyn Bay
Welsh housing ranges from stone terraces in the valleys to render-and-slate houses and modern estates, and the Welsh planning rules differ from England's in several places.
Start by comparing side return extensions, bungalow extensions and single-storey rear extensions: between them they cover most of the layouts we see requested for houses like these.
Areas we cover around Colwyn Bay
We cover Colwyn Bay and the postcode districts LL28, LL29. The same team covers Llandudno (5 miles), Rhyl (10 miles), Prestatyn (13 miles), Flint (25 miles), Buckley (28 miles), all within easy reach. Bangor, Gwynedd, in Gwynedd, is roughly 17 miles from Colwyn Bay and also on our list.
Choose an extension type
- Flat roof extensions · from £19,500
- Planning permission for extensions · from £300
- Wraparound extensions · from £33,000
- Orangery extensions · from £27,500
- Bedroom extensions · from £24,000
- Side return extensions · from £16,500
- Pitched roof extensions · from £20,500
- Glass box extensions · from £27,500
- Extension plans and drawings · from £1,100
- Kitchen extensions · from £25,000
- Double-storey extensions · from £35,000
- Single-storey rear extensions · from £19,500
- Building regulations for extensions · from £800
- Bungalow extensions · from £24,000
- Annexe extensions · from £51,000
- Side extensions · from £20,000
- Conservatory replacement extensions · from £18,500
- Timber frame extensions · from £19,500
- Extensions over a garage · from £22,000
- Porch extensions · from £3,700
- Utility and boot room extensions · from £13,000
- Home office extensions · from £14,500
Free site visit
First, a site visit: we look at the house, garden, access and drains and listen to what you need.
Design and approvals
We draw the design, agree it with you and handle planning or permitted development checks and building regulations.
Fixed written price
We confirm the build price in writing, based on the approved drawings and the finishes you have chosen.
Build and sign-off
Work is carried out to the agreed programme, inspected by building control and signed off at the end.
Questions about extensions in Colwyn Bay
How much does an extension cost in Colwyn Bay?
Using our Wales factor (×0.93), a standard-spec single-storey extension of 20 m² is a guide £38,000 to £48,500 including VAT, and a 32 m² two-storey extension £53,500 to £70,000. Your written price follows the survey.
Can I get a price before anyone visits?
Yes. This page shows guide prices adjusted for Colwyn Bay, and the guide-price tool gives a range for your own size and finish in about a minute.
Do you cover all of Colwyn Bay?
Yes, including the surrounding parts of Clwyd. Site visits are free and there is no obligation.
Do you handle building regulations?
Yes. We prepare the drawings and calculations, submit them and book inspections, ending with a completion certificate.
How long does an extension take in Colwyn Bay?
Usually 2 to 4 months of design and approvals, then 10 to 16 weeks on site for a single-storey extension or 16 to 24 weeks for two storeys.
Book a free site visit in Colwyn Bay
We will measure up, check the planning position and give you honest guide figures.
- Free, no-obligation site visit
- Planning route checked before you spend on drawings
- Written price once the design is agreed
- Building control sign-off at the end
Prefer to talk? Call 0800 088 6341 or .
Book a free site visit
Tell us a little about the project and we will arrange a time.