Slim-Line Aluminium Windows by Ultraglaze

Introducing our cutting-edge aluminium windows with slim frames – the ultimate blend of contemporary, traditional, or heritage aesthetics with high performance and modern innovation for any homeowner with an eye for design.

These windows offer a superior alternative to conventional materials, delivering exceptional energy efficiency, enhanced security, and minimal maintenance while perfectly matching your style preference, whether it's modern, classic, or historic.**

Their authentic look makes them an ideal choice for a range of properties, from contemporary homes to heritage buildings, with the added benefit of being approved for use in conservation areas.

Unrivaled Aluminium Excellence.

Our Aluminium Casement Windows are engineered with innovation and superior performance at their heart.

Constructed from premium-grade aluminium with a unique thermal break, these windows deliver outstanding insulation, achieving low U-values of 1.4 W/m²K with double glazing and 1.2 W/m²K with triple glazing—keeping your home comfortably warm and energy-efficient throughout the seasons.

Security is built-in as standard, featuring advanced multi-point locking systems and PAS 24 accreditation for robust protection at multiple points around the frame, providing complete peace of mind.

Paired with high-quality double or triple glazing, our casement windows excel in energy efficiency, noise reduction, and structural strength, all while offering slim sightlines that enhance natural light and complement any style from contemporary to heritage designs.

Chamfered Sash

Ideal for traditional aesthetics, the chamfered sash features subtly angled edges that mimic classic timber frames, blending seamlessly with heritage properties while delivering slim sightlines and modern thermal efficiency.
Heritage Sash

Perfect for conservation areas, the heritage sash replicates the authentic look of historic steel or timber windows, offering robust durability and enhanced security without compromising on contemporary insulation standards.
Flat Sash

Embrace minimalism with the flat sash design, providing a sleek, contemporary profile that maximizes views and natural light, complete with customizable flat bar detailing on the exterior for an understated yet refined finish.
Flush Sash

Achieve ultra-slim sightlines with the flush sash, creating a seamless, modern facade that sits flush within the frame—ideal for new builds or refurbishments, with superior weather resistance and a sharp shadow line for effortless elegance.
Square Bead Style

Opt for the clean lines of square bead glazing, which offers a bold, geometric edge for modern interiors, ensuring easy installation and compatibility with double or triple glazing for optimal energy performance.
Chamfered Bead Style

Add subtle sophistication with chamfered beads, featuring beveled edges that soften the frame's appearance, enhancing light diffusion and providing a versatile finish that suits both classic and transitional architectural styles.
Hertiage Flat Bar Detailing

Enhance privacy and style using a duplex unit paired with external flat bar detailing, which creates a layered, multi-pane effect reminiscent of traditional designs while boosting acoustic insulation and visual depth.

Astragal or Georgian Detailing

Astragal Detailing Elegantly applied to both internal and external glazing surfaces, astragal bars mimic the authentic look of traditional multi-pane period windows. Securely fixed to a single sealed glazing unit, they cleverly simulate divided panes, offering a sophisticated and timeless aesthetic.

Georgian Detailing For an enhanced heritage finish, astragal bars with Georgian detailing provide a refined and authentic period look. This option blends classic elegance with the modern durability and performance of aluminium windows.

Attention to detail

Aged Antique Leadwork

Available for our aluminium windows, aged antique leadwork is expertly crafted to capture the timeless charm of historic glass.

This premium decorative feature comes in authentic configurations such as heritage rectangles and classic diamond grids, seamlessly integrated into the sealed glazing unit, offering enduring elegance alongside the durability and low maintenance of modern aluminium.

Colour-Matched Ventilation

We offer two vent options to comply with Document F of the Building Regulations. Both vents are colour-matched to complement the aesthetics of our aluminium windows.

Our exclusive modular vent enables any welded sash window over 775mm wide to meet the new requirement of achieving 8000 EA airflow in a single window. If a specific equivalent area (EA) rate is required

Practical & Energy-Saving

Energy Rated Profile

Our advanced aluminium window system achieves excellent thermal performance with double-glazed sealed units, delivered straight from the standard configuration.

At the core of this efficiency is our innovative polyamide thermal break, with precisely engineered profiles that trap warm air to form a powerful thermal barrier within the frame—effectively blocking cold, draughts, and moisture for superior insulation and year-round comfort.

For even greater performance, upgrade to triple glazing and unlock U-values as low as 1.2 W/m²K—delivering top-tier energy efficiency and sustainability.

Peace of mind is standard: all locking systems are backed by a 10-year guarantee against mechanical failure.

Planning & Conservation for Aluminium?

As homeowners increasingly prioritize sleek, contemporary aesthetics alongside cutting-edge performance, the demand for slim aluminium casement windows is soaring in premium developments and historic properties alike.

In conservation areas, projects often require tailored details to preserve architectural heritage. Historically, planners overlooked aluminium options—yet our advanced systems set a new benchmark.

Featuring refined finishes and customizable options like heritage sashes and Georgian styling on the external frame, our aluminium windows meet stringent local planning requirements while delivering outstanding durability, security, and energy efficiency.

Compliance guaranteed

As a trusted installer of premium windows, we view quality as an ongoing commitment that demands constant attention and care.

Quality Hardware you can trust

Shootbolt Locking

Our windows are equipped with shootbolt locking as standard, delivering robust, multi-point security to keep your home protected year-round.
Stainless Steel Hinges

Our windows feature stainless steel hinges as standard, engineered for exceptional durability, corrosion resistance, and smooth operation.
2-Stage Vent Lock

Our windows are fitted as standard with a 2-stage vent lock, providing secure night ventilation and child-safe restricted opening for enhanced safety and peace of mind.
Hinge Protection

Optional upgrade: Anti-jemmy hinge protection - stainless steel guards that reinforce hinge security, significantly increasing resistance to forced entry and providing ultimate peace of mind.
Heritage Handles

Heritage-style window handles—elegantly crafted to replicate classic period designs, available in a choice of premium finishes .
Fab & Fix Handles

Fab & Fix handles—premium, British-manufactured hardware renowned for its superior strength, ergonomic design, and extensive range of styles and finishes.

Premium Glass Options as standard

Flemish

Level 1
Minster

Level 2
Sycamore

Level 2
Stippolyte

Level 4
Arctic

Level 5
Cotswold

Level 5

French Windows

Aluminium French Windows are distinguished by their timeless design—a pair of casement windows that open outward from the centre. This classic style integrates seamlessly into any of our premium window profiles, offering unmatched design flexibility. Whether you favor sleek modern lines, traditional aesthetics, or heritage-inspired detailing, French windows provide a versatile and elegant solution, enhancing light flow, ventilation, and visual appeal in any room.

Crafted from high-quality aluminium, these windows boast slim sightlines that maximize natural light and create an open, airy feel, making them perfect for both contemporary and historic properties.

Bow and Bay Windows

Aluminium Bow and Bay Windows transform your home by adding character, space, and abundant natural light.

These elegant features create a stunning focal point both inside and out, while bow and bay windows deliver exceptional kerb appeal, seamlessly enhancing the architectural beauty and interior ambiance of any property. Crafted from premium aluminium, they offer slim sightlines that maximize views and daylight, making them ideal for modern or heritage settings alike.

With their versatile designs, bow and bay windows extend living areas outward, creating cozy nooks or spacious seating areas bathed in natural light.

Tilt & Turn Windows

Aluminium Tilt & Turn Windows are an ideal choice for larger window installations, offering exceptional versatility with dual opening modes:

Full Side Opening: Swing the window inward for complete access—perfect for fire escape routes and easy maintenance.
Tilt Ventilation: Angle the top of the window inward for secure, controlled airflow.

Operation is smooth and intuitive: simply adjust the handle position to select your preferred mode.

Uncompromising Security Our aluminium tilt & turn windows exceed the highest UK standards:

PAS24 Certified for enhanced security performance.
Secured by Design Approved for police-recognised crime prevention.

This combination delivers practical functionality, safety compliance, and total peace of mind for residential and commercial projects.

Pick from any RAL Colour

Aluminium Windows can be spray finished in any RAL Colour. This process delivers a durable, long-lasting surface that resists fading, chipping, and weathering while providing a smooth, even appearance.

With hundreds of RAL shades to choose from—including matte, gloss, and textured options—you can perfectly match your windows to your property’s style or branding.

Yes, we offer woodgrain Aluminium Windows

Certain profiles of our aluminium windows are available in woodgrain finishes, offering a variety of standard colourways, including dual-foil options, to suit any home style.

Each window is coated with high-quality Renolit Exofoil, a premium material that provides a durable, weather-resistant surface with a glossy, realistic timber effect.

This finish enhances the aesthetic appeal of your windows while ensuring long-lasting performance with minimal maintenance.

The realistic woodgrain texture captures the character and charm of traditional timber, adding warmth and elegance to your property.

For a personalised touch, you can select a bespoke colour of your choice, allowing your windows to reflect your unique style while maintaining their sophisticated appearance.

Don’t see your preferred option? Rest assured, we can manufacture it to your specifications.

Still not sure about our Aluminium Windows?

This FAQ section focuses on our Aluminium windows, providing detailed information on their design, cost, energy efficiency, and value.

Whether you're renovating your home or just browsing window options, our responses are designed to give you the crucial details to help you decide.

Still not sure?
Give us a call.

A casement window is a hinged window that opens outward like a door, providing full ventilation and unobstructed views. Ideal for modern homes, they offer excellent airflow and are operated by a simple crank handle.
We can use any market-leading Aluminium Window Profile on your project.

Just because it’s not on here , doesn’t mean you can’t have it!
Yes—Our casement windows achieve U-values as low as 0.93 W/m²K with triple glazing. Multi-chambered profiles and advanced sealing reduce heat loss by up to 30% compared to standard windows.
Virtually maintenance-free. Aluminium windows require only occasional cleaning with warm soapy water.
No painting or repainting needed—guaranteed for 10 years against discolouration.
Absolutely. Choose from 20+ frame colours, multiple glazing options, hardware finishes (chrome, gold, black), and glazing patterns.
We can offer any bespoke size.
Yes, our certified installers provide full-service installation across the UK. FENSA registered with 10-year insurance-backed guarantees on both product and workmanship.
Of course.
Contact our expert team for free consultations, home surveys, and 3D visualisations.
We'll guide you through options and provide no-obligation quotes tailored to your property.

Download our brochure…

Download our brochure to explore the full range of our exquisite window designs, detailed specifications, and discover how our products can enhance your home's beauty and efficiency.

Spectus Legacy Brochure

Rehau Heritage