UK Renovation Budget Planner
Estimate double and triple glazing window replacement costs in pounds sterling (GBP). Compare uPVC, aluminium, and timber frames with certified FENSA fitting allowances.
UK Cost Benchmarks
Average installed costs across typical specifications. Figures include materials and standard UK tradesperson labour.
| Specification / Option | Typical UK Fitted Range | Characteristics & Considerations |
|---|---|---|
| Standard White uPVC Casement (A-Rated) | £550 – £850 per window | Energy-efficient double glazing, low maintenance, 10-year warranty |
| Flush Sash / Coloured uPVC Windows | £750 – £1,100 per window | Traditional timber-alternative aesthetic, high thermal performance |
| Thermally Broken Aluminium Windows | £950 – £1,450 per window | Slim sightlines, contemporary architectural look, extreme longevity |
| Engineered Timber Windows | £1,200 – £1,900 per window | Period-correct timber frames, micro-porous paint, conservation compliant |
HomeProjects.money editorial team reviewed this page on 6 August 2026. HomeProjects.money is an independent planning tool, not a contractor, surveyor or building-control body. Listed sources inform the context and checking process; calculator ranges remain editorial planning assumptions that must be tested against written local quotes.
Planning assumptions
Removal, supply, installation, basic trim work and disposal. Window quotations vary because the opening, frame, glazing and finishing work are priced together. Count every opening separately and record whether it is fixed, opening, a bay, a door-height unit or difficult to reach before comparing installers.
uPVC or vinyl is normally the starting point. Timber, aluminium, composite frames, triple glazing, acoustic glass and specialist safety glass can materially change both supply cost and installation time.
Rotten timber, damaged lintels, failed damp detailing or out-of-square openings create work that a simple per-window allowance cannot predict. Ask whether making good is included.
Upper floors, scaffolding, shutters, blinds, tiled reveals and decorated finishes can add labour. Confirm who repairs plaster, trim and paint after the frame is fitted.
Scope decisions
Cost comparisons are useful only when every contractor prices the same performance, preparation and finishing requirements.
Straightforward replacements where thermal performance, ventilation and security requirements can be met without specialist glass.
Homes exposed to cold, heat, noise or strong sun, provided the frame and installation detail support the specified performance.
Sound frames with isolated hardware, seal or glazing failures. A competent inspection should establish whether repair is realistic.
Country requirements
The calculator never mixes UK and US prices. The guidance below also follows the selected country; local authorities and code officials remain the definitive source.
All replacement windows must comply with Building Regulations Part L (thermal efficiency) and Part F (trickle vents). Using a FENSA or CERTASS registered installer ensures automatic certification.
Looking for US project planning in USD? Browse our US States & Cities Cost Directory or review our US Home Improvement Planning Guides.
Quote checklist
Common questions
No. Size, opening type, frame material, glazing, floor level and making-good work should be recorded separately.
Only a normal installation allowance. Lintel, rot, water-damage or wall repairs require inspection and a written provisional or fixed price.
They should specify equivalent frames, glass, ventilation, hardware, trim, access, disposal, certification and warranties.
Sources and checks
These sources support regulatory and market context. They do not publish the calculator's exact range and are not presented as contractor quotations.