Run-through sash horns
Fully integrated horns that are a continuous part of the sash frame, not a decorative add-on. The most period-accurate sash replacement available.
Windows
Sash Horn Windows
Traditional vertically sliding sash windows with authentic sash horns, the classic period detail that defines Victorian and Edwardian properties.
- 70mm multi-chamber frame
- A+ energy rated
- U-value 1.3 W/m²K (double) or 0.9 W/m²K (triple)
- Run-through integrated sash horns
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
Sash horn windows are the most accurate replacement for original timber box sash windows on Victorian and Edwardian properties across Romford and Essex. The curved horns at the base of the upper sash are fully integrated into the frame, a continuous run-through design, not a decorative add-on, giving a period-authentic finish that a plain sliding sash simply cannot match. CII Double Glazing installs sash horn windows using 70mm multi-chambered profiles achieving A+ energy ratings with U-values from 1.3 W/m²K with double glazing, or 0.9 W/m²K with triple glazing, fitted by our own directly-employed team.
Key Specifications
10-year profile guarantee. No warping, splitting, or discolouration
10-year mechanical guarantee on Shootbolt locking
Fully integrated run-through sash horns
Continuous rebate gasket seal for weather-tightness
Double rebated, welded joints, hand-finished
100% lead-free, recyclable uPVC. BSI Kitemark certified
Period Detail
What makes our sash horn windows different
Astragal bar detailing
Traditional astragal bars replicate individual pane detailing found on original Victorian and Edwardian sash windows, matching the character of existing streetscapes.
Horn profile detail
The curved horn at the base of the upper sash faithfully replicates original timber joinery, giving period properties the most sympathetic replacement.
Period-accurate exterior
From the street, sash horn windows are virtually indistinguishable from original timber box sashes. Profiles, proportions, and detailing are all designed for authenticity.
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
