Flush frame profile
The sash sits level with the outer frame face, replicating traditional timber casement proportions accurately enough for most conservation area approvals.
Windows
Flush Sash Windows
Period-accurate windows where the sash sits flush with the outer frame, the correct replacement for traditional timber windows in conservation areas and period homes.
- 70mm multi-chamber frame
- A+ energy rated
- U-value 1.3 W/m²K (double) or 0.9 W/m²K (triple)
- Sash flush with outer frame face
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.
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
Flush sash windows have the sash sitting flush with the outer face of the frame, replicating the appearance of traditional timber casement windows far more accurately than a standard UPVC casement. This makes them the correct choice for period properties, conservation areas, and anywhere that planning authorities require a sympathetic replacement. CII Double Glazing specialises in flush sash installations across Romford and Essex, you get modern A+ energy performance, high-security locking, and 18 colour options while the window looks exactly as it should on your home.
Key Specifications
10-year profile guarantee. No warping, splitting, or discolouration
SAC locking with £7,500 break-in guarantee
10-year mechanical guarantee on locking hardware
Single rebated, flush construction for timber-accurate appearance
Traditional monkey-tail handles and dummy stays available
100% lead-free, recyclable uPVC, the look of timber without the upkeep
Conservation Detail
What makes our flush sash windows different
Yale lock security
SAC locking backed by a £7,500 break-in guarantee, with traditional monkey-tail handles available to maintain period-appropriate aesthetics.
Cruciform key locking
The cruciform locking system provides multi-point security engagement concealed behind period-style hardware for a clean, authentic appearance.
Frame profile engineering
70mm single-rebated construction designed specifically for flush alignment, with welded corners and multi-chambered thermal performance.
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
