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Steel Replacement Windows


Elevate Your Space with Aluminium Replacing Steel

Steel Replacement Windows Brochure Energy Rated Windows Brochure

Increased Lifespan

Aluminium window frames resist rust and rot, offering unmatched longevity with a 40-year lifespan, outlasting steel, PVC, and timber.

Improved Thermal Efficiency

Modern aluminium windows use polyamide insulation, 160 times more efficient than steel, saving around £95 yearly in fuel costs and reducing condensation risk.

Reduced Maintenance

Aluminium window systems require only simple wipe-clean maintenance. Unlike steel, they don't rust or fade, even in harsh coastal environments, providing long-lasting performance with minimal upkeep.

Alitherm Heritage profiles utilise Smart technology polyamide thermal break technology which creates a barrier between the cold air outside and the warm air inside. 

Tilt Turn window

Tilt Turn

Double Door

Double Door

Double Door Mechanism

Double Door Mechanism

Single Door

Single Door

Aluminium Door Mechanism

Aluminium Door Mechanism

Open-out Casement

Open-out Casement

Product Information

Alitherm Heritage windows are the perfect choice for historical buildings, renovations, or unique refurbishment projects. Designed with horizontal modules, these windows can be customized for multi-part configurations.


With our cutting-edge polyamide thermal break technology, these windows provide an exceptional barrier to keep the warmth in and the cold out, helping you save on energy costs.


Available in various colors and finishes, including metallic, dual color, textured sensations, and anodized effects, Alitherm Heritage adds a touch of elegance to your space.


Tested for security and weather resistance, Alitherm Heritage windows offer the following features:


  • Complies with PAS 24:2016 (for casement windows & fixed lights only) and BS 6375 Part 1:2009.
  • British Standard Kitemarks KM 81543 and KM 81580.
  • Options include fixed windows, tilt-turn, side-hung, or top-hung casements.
  • The polyamide thermal break enhances thermal performance.
  • Designed as a direct replacement for steel windows.
  • Single or dual color, marine-quality polyester powder coat is standard.
  • Available with 316 Marine Grade Stainless Steel Hardware and unique Heritage and Art Deco hardware options.

Easy to maintain and visually appealing, Alitherm Heritage windows offer a long-lasting and elegant solution tailored to your needs and preferences.


Why choose aluminium?


Aluminium is a favorite material in many everyday products, from cars to appliances, and for good reason! Light yet strong, it's a trusted material for new or replacement windows and doors in homes.


We design our aluminium window and door systems with you in mind. Each one is crafted with a 'thermal-break,' providing insulation against heat loss. This means a warmer home, fewer drafts, and a reduction in condensation.


But that's not all! Our aluminium products are almost maintenance-free. A simple wipe-down is all that's needed to keep them looking brand new. Unlike other materials, they won't fade, deteriorate, or rust, even in tough coastal climates.



Choose aluminium for your home's windows and doors – it's the durable, energy-efficient, and low-maintenance solution that homeowners love!


Aluminium

Replacement Windows

Suitable for all Types of Properties


With excellent thermal values our Aluminium Replacement Windows exceed the current building regulations. They also offer high security as they are fitted with modern high security locks. Suitable for use in period properties, listed buildings, heritage and conservation areas.

PVCu Window Security

GREAT F E A T U R E S

Simple & Powerful

Our aluminium steel windows are the perfect affordable replacement for Steel Window.

Slim thermally broken aluminium profiles with a depth of just 47mm.

Can be installed into existing or new timber sub frames or direct to brickwork.

Fixed windows,tilt turn, side hung or top hung open out casements.

Highly secure with modern locking and can be tape glazed upon request.

Uses the latest polyamide thermal break to achieve excellent U values in-line with current building regulations.

The aluminium sections can have welded corners (upon request) to further increase authenticity.

Maintenance free aluminum.

Ease of installation – no need to cut back plaster, brickwork or any existing subframes.

Ultra slim sight-lines


Available at a much reduced cost when compared to steel windows.

Heritage and Art Deco hardware options.


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