Windows
Casement windows
- 6–8 weeks from survey to installation
- Own fitters — no subcontracting
- Prices updated 11 October 2026
Live price ranges
Casement window
approx. 1.2 × 1.2 m
Value
REHAU uPVC
£650–£1,100
Contemporary
SMART or AluK aluminium
£1,050–£1,900
Engineered
Schüco aluminium
£1,300–£2,300
Signature slimline
Cortizo Cor Vision
—
A survey confirms the final figure.
Overview
Why casement windows?
Casement windows open on hinges at the side or top — the classic British window. They suit almost any house, from post-war semis to new builds.
We price them in three tiers: REHAU uPVC (Value), SMART or AluK aluminium (Contemporary) and Schüco (Engineered), for a typical 1.2 × 1.2 m window. Choose a tier below to price your own sizes in the quote builder.
Simple and reliable
Side- or top-hung sashes with lockable handles.
Flexible layouts
Combine opening and fixed panes in one frame.
Fire escape options
Egress hinges where Building Regulations need an escape window.
uPVC or aluminium
The same style across three price tiers.
Ventilation built in
Trickle vents where the room needs background ventilation.
Prices by brand tier
What casement windows cost
| Typical size, installed, each | ValueREHAU uPVC | ContemporarySMART or AluK aluminium | EngineeredSchüco aluminium | Signature slimlineCortizo Cor Vision |
|---|---|---|---|---|
| Casement windowapprox. 1.2 × 1.2 m | £650–£1,100 | £1,050–£1,900 | £1,300–£2,300 | Not offered in this tier |
| See your own sizes and options | Price this in Value | Price this in Contemporary | Price this in Engineered | Not offered |
Not offered in Signature slimline.
Indicative ranges for London and the South East, supplied and installed, including VAT. Updated 11 October 2026. A survey confirms your final price.
Tiers and brands
Which suits your home?
REHAU
Best-value energy-efficient replacement windows
About REHAUSMART Systems
Heritage, period and conservation-area homes; mid-range contemporary
About SMART SystemsAluK
Contemporary homes, short lead times
About AluKSchüco
High-spec, triple glazing, Passivhaus-grade, large spans
About SchücoStyles and options
Made to your specification
Opening
- Side-hung
- Top-hung
- Fixed lights
- Egress (fire escape) hinges
Systems
- REHAU uPVC
- SMART or AluK aluminium
- Schüco aluminium
Glass
- Double or triple glazing
- Acoustic glass
- Solar-control glass
- Obscure glass for bathrooms
Colours
- White, grey, anthracite or woodgrain (uPVC)
- Any RAL colour or dual colour (aluminium)
Good to know
Planning, regulations and timings
Building Regulations and certification
Replacement windows and doors must meet Building Regulations for energy efficiency, safety glass, ventilation and fire escape. Each installation is certified through a competent person scheme such as FENSA, or signed off by building control, and the certificate is yours to keep for when you sell.
Ventilation
When windows are replaced, the room's ventilation must not be made worse. That usually means trickle vents in the new frames unless the room is ventilated another way — we confirm what's needed at survey.
Conservation areas and listed buildings
If your home is listed, in a conservation area or covered by an Article 4 direction, changing the look of windows or doors may need planning permission or listed building consent. We flag this at survey and give you the product details your council will ask for.
Survey to installation
Typically 6–8 weeks from survey to installation, agreed with you up front. One named project manager runs your job from survey to sign-off, and our own fitters do the work — we don't subcontract glazing.
Questions
Casement windows: your questions answered
How much does a casement window cost?
A typical casement window (approx. 1.2 × 1.2 m) costs £650–£1,100 in Value (REHAU uPVC), £1,050–£1,900 in Contemporary (SMART or AluK aluminium) and £1,300–£2,300 in Engineered (Schüco aluminium). Indicative, supplied and installed in London and the South East, including VAT; prices updated 11 October 2026. A survey confirms the final figure.
What's the difference between casement and tilt-and-turn windows?
A casement opens one way on side or top hinges. A tilt-and-turn tilts inwards at the top for ventilation and swings fully inwards for cleaning and escape. Tilt-and-turn costs a little more: £800–£1,300 in uPVC.
Can a casement window be a fire escape window?
Yes. Where Building Regulations require an escape window, we fit egress hinges and size the opening to meet the rules.
Do new casement windows need trickle vents?
Often, yes. When windows are replaced, the room's ventilation must not be made worse, which usually means trickle vents unless the room is ventilated another way. We confirm at survey.
Keep exploring
Related products and services
Aluminium windows and doors
Slim, strong aluminium from SMART, AluK, Schüco and Cortizo in any RAL colour.
uPVC windows and doors
A-rated REHAU uPVC — the best-value energy-efficient replacement windows.
Sash windows
Sliding sash windows for period homes, in REHAU uPVC or SMART Alitherm Heritage.
Brands we install
REHAU, SMART, AluK, Schüco, Cortizo, VELUX, FAKRO and Cambridge Skylights — and the tier each sits in.
Begin your project
Get your price range in under two minutes
Choose your product and brand tier and see a live price range. No obligation, and a survey always confirms the final figure.