Double glazing in Wales
uPVC windows in Wales typically cost £4,700 (3-bed semi, nine casement windows), with most between £3,300 and £7,500 including VAT. That is 6% below the UK average, because local installers charge around £155–£215 a day.
Covers Cardiff, Swansea, Newport, Wrexham, Bangor, Merthyr Tydfil and the surrounding areas.
Windows prices in Wales
| Product | Typical here | UK typical |
|---|---|---|
| uPVC windows 3-bed semi, nine casement windows | £4,700 | £5,000 |
| Aluminium windows 3-bed semi, nine casement windows | £8,000 | £8,500 |
| Timber windows 3-bed semi, nine casement windows | £11,500 | £12,500 |
| Sash windows one uPVC sliding sash window | £850 | £900 |
| Bay windows one three-panel uPVC bay window | £1,900 | £2,000 |
| Tilt and turn windows one uPVC tilt and turn window | £610 | £650 |
| Triple glazing one triple glazed uPVC casement window | £650 | £700 |
| Secondary glazing one secondary glazed panel inside an existing window | £260 | £280 |
| Replacement glass units one misted sealed unit in a mid-sized window | £80 | £90 |
Guide prices including VAT, −6% against the UK average. Indicative, not quotations.
Doors prices in Wales
| Product | Typical here | UK typical |
|---|---|---|
| Composite front door one composite front door and frame | £1,300 | £1,400 |
| uPVC door one uPVC front or back door and frame | £790 | £840 |
| Bifold doors a three-panel aluminium set, about 3 m wide | £3,700 | £3,900 |
| French doors a pair of uPVC French doors and frame | £1,100 | £1,200 |
| Sliding patio doors a two-panel uPVC sliding patio door | £1,400 | £1,500 |
Guide prices including VAT, −6% against the UK average. Indicative, not quotations.
Windows and doors in Wales
Wales sets its own Building Regulations, and its energy rules for replacement windows differ from England's, so check the installer is working to the Welsh standard. Valley terraces are stone-built and stepped down steep hillsides, which can make access a real part of the cost. In the National Parks, planning authorities control the look of windows more closely than elsewhere.
Valley terraces often open onto steep streets or steps, which makes getting a heavy composite door to the house harder than it sounds, though no less worthwhile. Driving rain on west-facing walls makes a good threshold and seals essential. In Cardiff and Newport's suburbs, rear bifolds and French doors are the common garden-door jobs.
Wales has one of the highest proportions of solid-wall, pre-1919 housing anywhere in the UK. The valleys are lined with stone terraces built for the coal and steel industries, roofed in Welsh slate and stepped down steep hillsides, which makes access and scaffolding a larger share of the bill than it would be on level ground. Cardiff and Newport add Victorian and interwar suburbs on more conventional lines.
Planning and building rules in Wales
Building regulations in Wales are set by the Welsh Government and have diverged from England, particularly on energy efficiency, so guidance written for England does not always apply. Eryri (Snowdonia), Bannau Brycheiniog (the Brecon Beacons) and Pembrokeshire Coast are National Parks, each with its own planning authority and tighter control over external change.
The weather
Wet and exposed. Snowdonia is among the wettest ground in the UK, with parts of the uplands recording well over 2,000mm a year against a UK average nearer 1,150mm. Driving rain on west-facing solid walls is the single biggest weathering problem in the Welsh stock, and it is why breathable repair and correct pointing matter more here than in the dry east of England.
Get quotes from installers in Wales
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