Sliding Sash WindowsClassic, Secure & Energy Efficient
Our sliding sash windows offer heritage charm with modern performance. A choice of uPVC & aluminium with authentic details. The UK’s classic window style with smooth vertical sliding and superior weather sealing.
What is a Sliding Sash Window?
A sliding sash window is the UK’s most iconic heritage window style. It is defined by two sashes that slide vertically past each other – known as a double-hung sliding sash – which creates a timeless look with authentic period detailing and balanced proportions.
Unlike a casement window where the sash swings open on hinges, a sliding sash glides smoothly within its outer frame. This space-saving design makes it the perfect, elegant and characterful option for traditional and modern British homes.
At Win-Doors INT LTD we offer sliding sash windows in uPVC & aluminium, with configurations including authentic run-through sash horns, astragal bars, and bay & bow sash combinations. All are A-rated, secure and made-to-measure in London.
KeyFeatures
Heritage style meets modern performance authentic, A-rated sliding sash windows, made-to-measure in London.
Authentic Sash Horns
Traditional run-through horns for period charm
Smooth Vertical Slide
Effortless glide with balanced sash action
A-Rated Efficiency
Retains heat & cuts energy bills year-round
Heritage Astragal Bars
Classic Georgian bars for authentic look
Secure Locking System
Multi-point locks for peace of mind
Draught-Proof Seals
No rattles, no draughts, quiet comfort
Low Maintenance Finish
uPVC & aluminium, never needs painting
Made-To-Measure London
Custom built for perfect fit every time
Two Finishes. One Timeless Sash.
Built for British homes. Choose heritage warmth or sleek aluminium strength – both A-rated, secure, and made-to-measure in the UK.
CUSTOMER FAVOURITEuPVC Sliding Sash Windows - Profile 22
- A+ Energy Rated
- Multi-point Security
- Zero Maintenance
- 20+ Colours & Dual Colour
- 10 Year Guarantee
- Cost Effective
ALUMINIUM HERITAGEAluminium Sliding Sash Windows
- Ultra-Slim 54mm Sightlines
- Thermally Broken
- 45+ Year Lifespan
- Powder-Coated RAL Colours
- 100% Recyclable
- Architectural Strength
Windows Built For British Homes, Backed By 20+ Years Of Expertise
We don't just fit windows we manufacture premium casement systems designed for the UK climate, installed with precision, and guaranteed for a decade.
Made to Measure in the UK
Every window manufactured to your exact size, not off-the-shelf. Perfect fit, zero compromise.
Profile 22 System
UK's most trusted 70mm system for thermal & weather performance. Engineered for British weather.
A+ Energy Efficient
Keep heat in, bills down, EPC ratings improved. Argon-filled double glazing as standard.
Secured By Design
Multi-point locking, internal glazing, police-approved security. Your peace of mind built-in.
10 Year Guarantee
Full guarantee on frames, hardware & installation. No quibble, no small print.
Made to Last, Zero Maintenance
Never rots, warps or needs painting. A quick wipe keeps them pristine for decades.
Where Are Sliding Sash Windows Used?
From Victorian terraces to contemporary townhouses, sliding sash windows suit any architecture. Their smooth vertical glide, authentic proportions, and effortless ventilation make them the timeless choice for homes that demand character, charm, and performance.
01 • ApplicationResidential Homes & Villas
Elevate façades with clean lines and expansive glass. Perfect for modern villas where indoor-outdoor flow matters.
- Floor-to-ceiling ventilation
- Heritage + modern compatibility
02 • ApplicationKitchens & Living Areas
Invite light and cross-breeze where family gathers. Easy crank operation even over counters and sinks.
- One-hand crank operation
- Unblocked view while cooking
03 • ApplicationCommercial & Office Spaces
High-performance thermal break aluminum meets corporate aesthetics and all-day comfort.
- Acoustic insulation up to 38dB
- Low-E for energy compliance
04 • ApplicationBedrooms & Bathrooms
Privacy, ventilation and condensation control. Ideal for intimate spaces needing fresh air without compromise.
- Trickle vents for night cooling
- Frosted & tempered glazing options
05 • ApplicationHotels & Apartments
Durable, secure, and uniform across floors. Multi-point locking meets hospitality-grade maintenance.
- 90° egress for cleaning access
- Consistent sightlines across façade
06 • ApplicationSchools & Institutions
Safe, controllable ventilation for classrooms and labs. Tested for high-cycle daily use.
- Restrictor stays for child safety
- Reinforced hinges for heavy use
Designed For Every Home
Heritage Character
Authentic horns & slim lines that honour period style.
Smooth Vertical Glide
Effortless slide operation with balanced, secure control.
Thermal Efficiency
Advanced thermal break keeps homes warm & bills low.
Slim Sightlines
More glass, more light with 37mm meeting rail.
Colours to inspire
Aludec and Woodec deliver a step change in the application of PVCu colour finishing options.
Inspired by nature
Woodec
Woodec illustrates the appearance of real wood with a unique character combined with all the advantages of our excellent product range. This is what the new Woodec decorative foils offer. Not only is it difficult to distinguish visually from the natural material, but the Woodec foil also recreates wood very realistically to the touch, thanks in part to deep embossing and a matte top layer.
Inspired by style
Aludec
The attractive surface of Aludec decorative foils, distinguished by a unique fine-grained, matt surface with a similar finish to powder-coated aluminium, is a fabulous option that suits contemporary modern minimalist designs.
The new Aludec foils follow this trend, offered in seven attractive shades ranging from whites and greys, brown, jet black, anthracite, and a metallic finish.
Feature colours
Standard foil colours
All aluplast coloured foil finishes feature innovative technology which improves performance characteristics, providing a much longer life cycle of the surface finish.
Custom foil colours
Our Completed Projects
Sliding Sash Windows FAQs
Answers to the questions homeowners ask us most about uPVC, Aluminium and heritage sliding sash.
Are aluminium sliding sash suitable for heritage homes?
Yes designed with authentic sash horns, slim 37mm meeting rails and heritage colours to meet conservation requirements.
Do sliding sash windows tilt for cleaning?
Yes both sashes slide and tilt-inwards for safe, easy cleaning from inside.
Are they energy efficient and secure?
Yes, with a full thermal break, double glazing and multi-point locks, they are A-rated and PAS24 secure.
Elevate Your Home with Windows & Doors
Get a free, no-obligation quote for casement windows in London. Made-to-measure, FENSA installed, A-rated & PAS 24 secure. Side-hung, French & bay options in uPVC, aluminium.