Shootbolt security locking
Secured by Design accredited shootbolt locking with BSI-tested security criteria and a 10-year mechanical guarantee on every installation.
Windows
Casement Windows
The most popular window style in the UK, side-hinged sashes that open outward for excellent ventilation and a clean, versatile look.
Casement Survey Notes
Casement windows are usually the right starting point when the priority is reliable ventilation, strong thermal performance, straightforward cleaning, and a sensible budget across several openings. On survey we look at each room separately because bedrooms, bathrooms, kitchens, bay windows, and front elevations often need different opener layouts even when the frame system is the same.
- 70mm multi-chamber frame
- Up to A+14 rated
- U-value 1.3 W/m²K (double) or 0.9 W/m²K (triple)
- Secured by Design accredited
10YEARGUARANTEE
Assure certifiedNo subcontractorsFinance availablePersonalise Your Window
Colours & Finishes
Frame Colour: Smooth White
Standard colours
Extended lead time colours
Dual colour available, different interior and exterior finishes on request.
Hardware Finish: White
Handles, letterplates, and accessories available in matching finishes.
Made to measure. Confirm your colour and hardware choice during your free survey.
Hardware Finish: White
Handles, letterplates, and accessories available in matching finishes.
Made to measure. Confirm your colour and hardware choice during your free survey.
Installation Fit
Where casement windows usually make sense
Casement windows are usually the right starting point when the priority is reliable ventilation, strong thermal performance, straightforward cleaning, and a sensible budget across several openings. On survey we look at each room separately because bedrooms, bathrooms, kitchens, bay windows, and front elevations often need different opener layouts even when the frame system is the same.
Best fit for
- Full-house UPVC window replacements where consistency and value matter
- Bedrooms and living rooms that need controlled outward-opening ventilation
- Homes where escape hinges, trickle ventilation, or obscure glass need room-by-room planning
What we check on survey
- We check opener direction against curtains, blinds, paths, and driveways.
- We confirm safety glass, fire escape, and ventilation requirements before quoting.
- We separate standard colour lead times from extended foil and dual-colour choices.
Free Survey
Ready to shortlist this product properly?
If this looks like the right fit, we can survey the opening, confirm the specification, and price it properly for your home with no obligation.
Free surveyFixed quoteDirect Cii installation team
Casement windows are the most widely installed window style in the UK, and for good reason. Their side-hinged sashes open outward, providing excellent ventilation while maintaining a clean, uncluttered look from inside and out. Cii Double Glazing supplies and installs uPVC casement windows across Romford and Essex, using 70mm multi-chambered profiles that achieve A+ energy ratings with U-values from 1.3 W/m²K with double glazing, or 0.9 W/m²K with triple glazing. Our directly-employed installation team handles everything from survey to sign-off. No subcontractors at any stage.
Key Specifications
10-year profile guarantee. No warping, splitting, or discolouration
10-year mechanical guarantee on all locking hardware
£7,500 break-in protection promise
Stay Guard Elite hinge protection, twice Secured by Design test force
Stainless steel friction stays tested to 20,000 cycles
100% lead-free, recyclable uPVC. BSI Kitemark certified
Engineering Detail
What makes our casement windows different
Stay Guard Elite hinges
Hinge protection that withstands twice the force required by Secured by Design testing, providing exceptional resistance to forced entry at the hinge side.
Multi-chambered frame profile
70mm EnergyPlus profiles with multiple thermal chambers that trap warm air within the frame, achieving A+ energy ratings and U-values from 1.3 W/m²K.
Triple glazing available
Optional triple glazing brings U-values down to 0.9 W/m²K for north-facing rooms or exposed elevations, significantly reducing heating bills.
How It Works
From Survey to Sign-off
Step 1
Survey
We visit, measure, and advise on the right configuration for your property.
Step 2
Install
Our directly employed team installs with clean, tidy workmanship.
Step 3
Sign-off
Final checks, handover, and Assure certification where required.
Next Step
Want a fixed quote from a real survey?
We will measure up, talk through finishes and installation details, and give you a clear quote based on the actual opening rather than a generic estimate.
Free surveyFixed quoteDirect Cii installation team
Checkatrade
“Fantastic experience from initial survey to completion. The team were professional, tidy, and the attention to detail on the finish was fantastic. Couldn't be happier with our new windows.”
Checkatrade
“Used CII for our entire house of windows. Brilliant from start to finish. Knowledgeable, reliable, and very professional. The quality of the product and installation is second to none.”
Questions Answered
