Aluminium Windows
Supply Only | Supply & Fit
Transform your property with premium aluminium windows that combine contemporary aesthetics with exceptional durability and enhanced security. Our bespoke aluminium windows feature slim profiles, larger glass areas with variety of glass options, and outstanding longevity, making them ideal for both residential homes and commercial or industrial buildings.
To ensure your aluminium windows perfectly match your property’s style and character, you can choose from 200+ RAL frame colours. Popular choices include white aluminium windows, black aluminium windows, and grey aluminium windows.
What are Aluminium Windows?
Aluminium windows are window systems made using aluminium frames fitted with glazed units, typically double or triple glazing, designed to provide strength, durability, and energy efficiency. They are characterised by slim, strong profiles that allow larger glass areas, modern aesthetics, and long-term performance with minimal maintenance. Aluminium windows are commonly available in styles such as sash and casement, making them suitable for both contemporary and traditional properties.
As the UK’s top aluminium windows suppliers, at Colin’s Sash Windows, aluminium windows are available in a range of styles, including aluminium sash windows and aluminium casement windows, combining heritage aesthetics with modern performance. They offer clean architectural lines, enhanced security, and a wide choice of finishes and RAL colours, making them suitable for homeowners, architects, and developers looking for a premium glazing solution.
Product Range of our Aluminium Windows
We offer a carefully selected range of aluminium double glazing to suit both modern and traditional properties. Our collection includes Aluminium Casement Windows, Aluminium Flush Casement Windows, Heritage Aluminium Casement Windows, and Aluminium Sliding Sash Windows, each designed to combine clean aesthetics with strong performance.
Aluminium Casement Windows
Our aluminium casement windows provide classic side-hung or top-hung configurations, offering excellent ventilation and easy operation. Ideal for most property types with customizable opening styles.
Heritage Aluminium Casement Windows
Designed to replicate the slim sightlines of traditional steel windows, these thermally broken heritage aluminium casement windows are ideal for Victorian and Art Deco properties, renovation projects, and listed buildings, having been approved by numerous UK planning authorities.
Aluminium Flush Casement Windows
Our aluminium flush casement windows feature classic side-hung or top-hung opening configurations, designed so the opening sash sits perfectly flush within the outer frame when closed. This creates a clean, flat external appearance with no overlapping sections, closely replicating the look of traditional timber windows while benefiting from modern aluminium performance.
Aluminium Sliding Sash Windows
Our Aluminium Sliding Sash Windows truly shine with slim, durable profiles that capture the classic vertical sliding charm of traditional timber sashes, while offering superior modern thermal efficiency (A-rated, U-values as low as 1.2 W/m²K), security, and low maintenance.
Technical Specifications of our
Aluminium Windows Online
Frame Construction
We manufacture our aluminium windows using precision-engineered aluminium profiles with integrated polyamide thermal breaks. This construction significantly reduces heat transfer while maintaining strength and slim sightlines. Our profiles are available in multiple depths, allowing us to accommodate high performance double glazing to suit different property requirements.
Glazing Options
We supply our aluminium windows with high-quality double glazing as standard, with a wide range of upgrade options available. These include laminated security glass, acoustic glazing for noise reduction, obscure patterned glass for privacy, and Low-E coatings to improve thermal efficiency. Our sealed units range from 24mm to 44mm, depending on the chosen specification.
Hardware
We fit our aluminium windows with premium-grade hardware for smooth operation and long term reliability. This includes high quality friction stays, multi point espagnolette locking systems, and our range of durable handles. Handle finishes are available in chrome, brushed nickel, black, and white. Optional restrictors and key lockable handles are also available for added safety and security.
Weather Performance
We design our aluminium windows to perform exceptionally well in the UK climate. Continuous weather seals help protect against wind, rain, and draughts, while integrated drainage systems efficiently channel water away from the frame to maintain long term performance and comfort.
Finishes
We offer durable powder coated finishes designed to withstand weathering and daily use. Choose from smooth or textured coatings in both standard and bespoke RAL colours. Dual colour options are available, allowing you to select different finishes for the interior and exterior of your windows.
Colours & Finishes
We offer a wide selection of finishes for aluminium window frames, including popular shades like anthracite grey (RAL 7016), pure white (RAL 9010), and jet black (RAL 9005), plus hundreds of additional RAL colours. Metallic and textured coatings are also available for a more distinctive look.
Across the UK, the three most preferred styles are white aluminium window frames, grey aluminium window frames, and black aluminium window frames.
Aluminium Windows
BFRC Energy Rating Comparison
The British Fenestration Rating Council (BFRC) evaluates window performance on a scale from A++ to G.
Our aluminium window range delivers strong results within this system. Each heritage aluminium window we offer is independently assessed by BFRC and graded accordingly. This guidance is provided to help you understand energy performance before purchasing or upgrading your windows. View the window energy efficiency ratings below.
| Window Material | Typical BFRC Rating* | Typical U-Value (W/m²K) | Performance Notes |
|---|---|---|---|
| uPVC | A – A+ | ≈ 1.2 – 1.4 | Multi-chambered uPVC profiles with Argon-filled double glazing and Low-E glass usually deliver the best overall insulation and energy efficiency. |
| Timber (Wooden) | B – A | ≈ 1.3 – 1.5 | Timber is naturally insulating and ideal for conservation and period properties. Performance depends on timber thickness, glazing specification and external paint or stain finish. |
| Aluminium | B | ≈ 1.4 – 1.6 | Modern aluminium frames use thermal breaks to achieve good U-values. Slim sightlines maximise glass area and light while still meeting current energy-efficiency standards. |
*Typical ratings shown for modern double glazed specifications. Exact BFRC ratings and U-values depend on final glass, spacer and frame configuration chosen for your project.
Applications of Our Aluminium Framed Windows
Residential Properties
Our double glazed aluminium windows are ideal for modern homes, apartments, extensions, and renovation projects. Slim aluminium frames maximise the glazed area, allowing more natural light into living spaces while delivering a clean, contemporary finish.
Period Properties
We supply slimline and heritage style aluminium windows designed to replicate traditional proportions. When specified correctly, they are suitable for many period properties and conservation areas, offering modern thermal performance without compromising architectural character.
Commercial Buildings
Our aluminium windows are well suited to commercial environments such as offices, retail units, and public buildings. They offer exceptional durability, low maintenance requirements, and a professional appearance, making them ideal for high use applications.
High Rise & Apartments
Lightweight yet extremely strong, our aluminium windows are an excellent choice for multi storey and high rise buildings. They provide reliable structural performance, strong resistance to wind and weather, and consistent long term performance in exposed conditions.
To Get Value For Money
Choose Colin's Sash Windows
10 Years Gaurantee
All our slimline aluminium windows comes with the 10 years on parts and labour.
Made in Britain
We supply only made in Britain trade aluminium windows that are manufactured in UK.
We Match Your Price
If you have got a cheaper price from any other supplier then we are ready to match the price.
Our Verified Customer Reviews ✅
We went for their uPVC sliding sash windows to replace the old ones. The price was unbeatable for A+ rated double glazing.
we used their recommended fitter, and the finish is excellent.
Highly recommend without the premium price tag.
Average Cost Of Aluminium Windows
Pricing for our aluminium windows varies depending on size, style, colour, glazing, and hardware specifications. Our aluminium windows price calculator allows you to get an instant estimated cost based on your exact requirements. Standard casement aluminium windows start competitively, with prices increasing for larger sizes, bespoke configurations, or custom RAL colours.
While aluminium windows may involve a higher initial investment, they offer exceptional long term value through decades of low maintenance performance, improved energy efficiency, and increased property value.
Maintenance & Care
Aluminium windows require minimal maintenance compared to timber. Occasional cleaning with mild detergent and water keeps frames looking pristine. Hardware should be lubricated annually with light oil. Check and clear drainage holes to prevent water accumulation. Seals may require replacement after 15-20 years, depending on exposure.
Calculate the Cost of Aluminium Windows Online
Get a fast, accurate estimate slim aluminium framed windows in just 60 seconds using our double glazing cost calculator. No sign-up, no obligation – simply enter your details and see your tailored price.
Benefits Of Choosing Our Aluminium Windows
Buying aluminium windows from us means you’re not only getting new windows, you’re also securing all the added benefits that come with Colin’s Sash Windows. We aim to earn your full trust, which is why the advantages of our double glazed aluminium windows truly set us apart from other suppliers.
Exceptional Durability
Our aluminium windows can routinely last 30-50 years with minimal maintenance, far outlasting traditional materials. The powder-coated finish creates an inseparable bond with the material, resisting scratches, UV damage, and weathering.
Contemporary Aesthetics
Slimline frames maximise glass area, creating clean sightlines and modern appeal. Perfect for your properties seeking architectural sophistication, from minimalist new builds to stylish renovations.
Energy Efficiency
These advanced thermal break technologies and high-performance glazing options deliver impressive U-values. Our systems incorporate polyamide thermal barriers, warm-edge spacer bars, and Low-E glass as standard, ensuring thermal performance that rivals traditional materials.
Low Maintenance
Unlike timber, aluminium never requires painting, staining, or treatment. The durable finish maintains its appearance for decades, requiring only occasional cleaning.
Security Excellence
The inherent strength of our aluminium provides superior burglary protection. Multi-point locking systems, internal beading, and key-lockable handles ensure your property remains secure. The systems meet PAS24 security standards.
Design Versatility
Available in extensive RAL colour ranges, including anthracite grey, jet black, contemporary white, and custom options. Choose from single colours or dual-tone configurations with different internal and external finishes.
Real Images Of Our
Ultra Slim Aluminium Windows In UK Homes
Aluminium Framed Windows Buying Guides
Areas We Deliver
Supply and installation are available nationwide in most areas across the UK. Request a quote with your
postcode and project details to confirm survey dates and lead times. We have the lowest leads times of 2-3 weeks
approx. for all our uPVC windows styles.
For delivery of our uPVC sash and casement windows you can see the below image, in the green areas the delivery cost will be £36 and in yellow highlighted areas the delivery cost will be £120+ and for these areas please first talk to our sales team and then we will confirm you about delivery and with in red areas we don’t deliver.
Ready to Get Started?
Transform your property with premium aluminium windows designed for your specific requirements. Request a consultation to discuss options, view samples, and receive accurate quotations. Discover how slimline profiles and glazing can revolutionise your living or working spaces with a flood of natural light and modern elegance. Contact us today to explore our complete range of aluminium window solutions and begin your transformation journey.
Get in Touch At Once!
Feel free to call us on 01525 552131. Our friendly sales advisors will guide you through the ordering process and help you with anything regarding double glazed windows. Alternatively, don’t hesitate to write us via the contact form or directly to our email address sales@colinssashwindows.co.uk. Don’t waste your time and take advantage of the finest quotes throughout the UK and Ireland.
