Aluminium WindowsSlim, Secure & Thermally Efficient
Our aluminium casement windows deliver clean, architectural style with modern performance.
Available as side-hung, top-hung and French casement, with ultra-slim sightlines and a storm-proof overlap for superior weather sealing and security.
What is a Aluminium Window?
An aluminium casement window is the UK’s most popular window style, re-engineered for modern architecture.
It is defined by its sash overlapping the outer frame known as a lipped or storm
casement which creates a double weather seal for superior storm proofing. Hinged at the side hung or top hung & awning, the sash opens outward for maximum ventilation and easy cleaning.
Unlike a flush casement where the sash sits completely flat within the frame for a heritage look, our standard aluminium casement’s overlapping lip presses tightly against the frame when closed. This makes it our most weathertight, secure and versatile aluminium option.
At Win-Doors INT LTD we offer aluminium casements in side hung, top hung, French casement no centre mullion, & fixed + casement combinations for bays and bows. All are A+ rated, PAS 24 secure, with ultra-slim sightlines and made-to-measure in London
KeyFeatures
Engineered for strength, style and British weather protection.
Thermal Break Frame
45mm aluminium + 22mm polyamide barrier stops heat transfer
Multi-Point Locking
3-5 concealed points, Secured by Design certified
Concealed Crank Handle
Smooth stainless crank, 90° outward swing, one-hand
Low-E Double Glazing
24mm double / 36mm triple, Argon filled, warm-edge
100% Full Ventilation
Full sash opening vs 50% slider, maximum cross-breeze
EPDM Triple Seal
Triple compression gaskets, airtight & water-tight
Acoustic Insulation
Up to 38dB reduction, laminated acoustic glass option
Powder-Coat Finish
25yr warranty, teal & gold custom, UV & low maintenance
Where are Aluminium window, used?
From contemporary extensions to high-performance commercial spaces, aluminium adapts to any architecture. Its ultra-slim profile, 90° outward swing, and precision thermal break make it the architect's choice for spaces that demand more light, more air, and total control.
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
Built Stronger. Built Slimmer. Built to Last.
Premium Architectural-Grade Aluminium
100% recyclable, ultra-strong yet lightweight. Allows slimmer 54mm sightlines, larger glass areas and will never warp, rot or swell like timber or uPVC.
Energy Efficiency
Compression seal + thermal break, U-factor ≤0.28
Advanced Thermal Break Technology
Polyamide thermal break + A-rated double/triple glazing. U-values as low as 1.2 W/m²K for year-round warmth and lower energy bills.
Enhanced Security
Multi-point locking, concealed hinges
Powder Coated For Life
Marine-grade powder coating in 150+ RAL colours, dual-colour option inside/out. No painting, no fading - guaranteed for 25 years.
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
Aluminium Windows FAQs
Answers to the questions homeowners ask us most about uPVC, aluminium and heritage aluminium windows.
Are aluminium windows energy efficient?
Yes. Our aluminium windows feature an advanced polyamide thermal break and A-rated double or triple glazing, achieving U-values as low as 1.2 W/m²K. They keep your home warmer in winter, cooler in summer, and help reduce energy bills.
Do aluminium windows require a lot of maintenance?
No. Unlike timber, aluminium will never rot, warp, or swell. Our marine-grade powder coating is weather-proof, scratch resistant and comes in 150+ RAL colours. Just an occasional wipe with soapy water is enough guaranteed for 25 years.
Are aluminium windows secure?
Absolutely. Manufactured with ultra strong architectural-grade aluminium, multi-point locking, and PAS 24 certified security as standard. Stronger and more secure than standard uPVC.
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.