Window Replacement Cost in Wales

Estimated £9,114 – £13,670

Itemized cost breakdown
Item	Estimate
Old window removal	£1,031
Window unit	£4,700
Installation labor	£2,597
Trim, flashing & finish	£868
Disposal	£298
Subtotal	£9,493
VAT (20%)	£1,899
Total inc. VAT	£11,392

What affects window replacement cost in Wales

Window Replacement costs in Wales differ from the national baseline mainly because of local labor rates. Construction-trades wages in Wales are about 2% below the GB mean (ONS ASHE), a modest downward adjustment that has limited effect on overall project cost. High Snowdonia and upland rainfall combined with strong coastal and mountain winds push driven rain hard against window reveals; weather-rated, fully drained casements with robust perimeter sealing are needed to keep water out of the wall in these exposed valleys. In Wales, replacement windows must comply with Building Regulations (the same Approved Documents regime as England). Most Welsh installers self-certify via FENSA or CERTASS, avoiding a separate building-control fee. Replacement windows carry 20% VAT (UK-wide).