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Warmcore at Lee uPVC

Built With a Revolutionary Thermal Core at its Heart


Built around a belief that beauty doesn't have to compromise performance, WarmCore® aluminium windows were created out of a desire to combine the desirability and durability of aluminium with unparalleled insulation. The unique, full width thermal core is key to why WarmCore® windows are 25% more thermally efficient than traditional aluminium systems.

Strong and secure, WarmCore® windows come with multi-point locking, internal beading and are backed by a 10 year product guarantee - helping keep you and your home safe. Available as casement or tilt and turn windows, and with a flush sash option that brings the outer frame perfectly level with the opening part of the window - WarmCore® windows are the perfect warm, secure and beautiful addition for your home.

Warmer By Design


WarmCore® has been designed from the ground up to offer market-leading thermal performance, and comfortably meets the requirements of Building Regulations across the whole of the UK. Traditional aluminium windows can force you to choose aluminium aesthetics and finish over thermal performance. WarmCore gives you both, with its innovative full width thermal core.

This unique composite construction creates the most thermally efficient window in its class. This design philosophy has produced a window system that has exceptional thermal performance, helping keep fuel bills lower and heat in your home, while retaining the sleek and architectural look of aluminium.

Fresh, Clean Design


Whether you are tucked up inside watching TV with our WarmCore® windows protecting you from the elements, or have your windows flung wide open on a hot summers day you can be assured your high performance aluminium windows will look pristine.

With clean, modern lines, WarmCore® creates windows with a refined and understated beauty. Perfectly suited to modern architecture as well as replacement projects, from large fixed pane picture windows to windows with multiple openers, WarmCore® has it covered.

Attention has even been paid to how the window sashes look when open, with the black full width thermal core creating a neat and thought-through appearance.

Tilt and Turn


For the ultimate in versatility the WarmCore® system is available as a tilt and turn window.

Ideal for use in upstairs locations, tilt and turn windows can be turned inwards for ventilation helping your home stay fresh. Alternatively they can be turned inwards for cleaning, or for when the weather is too glorious to be locked out.

Using the latest multi-point locking, and custom-designed hinges, tilt and turn windows are as safe and secure as the rest of the WarmCore range.

Flush Sash - Clean and Contemporary Styling


WarmCore® casement windows are available in a flush sash option for the ultimate in clean, modern aesthetics. Using a stepped outerframe, the sash - the opening part of the window - sits on the same plane as the rest of the window, creating a pure, cutting-edge look to this high performance window system. In addition, where two flush sashes meet, WarmCore® uses a feature mullion - which echoes the flush sash feature, creating a precise bead line in-between the two windows.

Colour Options


Aluminium Windows and Doors in Preston

Available as standard in a choice of 2 powder coated colours with other colours available to order, including any RAL or BS code. WarmCore® also allows you to pick a different colour for each side of your window. Want a colour outside with white inside to leave you free to change your interior in the future - with WarmCore® that's no problem.

Style Options


A choice of 2 external sash and outer frame designs enable you to personalise WarmCore® windows to suit the style of your home. Pencil round styling helps to give a softer aesthetic, while Square styling creates a precise contemporary look.

Triple Glazing - For Ultimate Thermal Performance


Robustly designed to take the weight of triple glazed units as standard, choose this option for the ultimate thermal performance - at least 75% better than standard double glazed aluminium windows.

Opting for 44mm triple glazing rather than standard 28mm double glazing reduces the window U-Value rating from 1.3 to 0.8. Triple glazing is ideal for WarmCore® windows installed in exposed locations.


Aluminium Windows and Doors in Preston

Please see the Warmcore brochures in our downloads section at the bottom of the site

Full Range of Aluminium Residential Doors Available


A thermally efficient range of aluminium doors ideally suited to the residential, light commercial & social housing markets. This collection of doors and panels are manufactured to provide high performance solutions for today's specification demands. Our stunning, thermally broken door system is suitable for both replacement doors into existing buildings and for and installation in new build environments.

  • Sleek line profile
  • Triple glazed unit options
  • Winkhaus lever multi point locks
  • Exclusive panel and glass designs
  • MDF reinforced core panel options
  • 1.2mm powder coated aluminium panel skins
  • Bre A+ rated CC free expanded panel polycore
  • Matching side and top light frame/panel options
  • Marine grade 0.9mm stainless steel glazing trims

Our Smart aluminium systems are designed with performance, looks and efficiency in mind. Each frame incorporates a 'thermal break'. This effectively insulates our doors and windows against heat loss, raising a home's internal temperature and helping to reduce the risk of condensation. Maintenance for aluminium is simple and straight forward, with a routine 'wipe clean' all that is required to keep the products looking their best. With no requirement for re-painting or re-varnishing, aluminium windows and doors will never fade, deteriorate or rust, even in harsh environments, such as coastal locations. The Smart window and door systems have all been developed to deliver the perfect combination of stylish looks and outstanding performance. Our unrivalled range of colour and finish options provides inspiration for all types of properties. From contemporary urban homes to traditional Cotswold cottages, we have the perfect colour to suit every project in any location. Our complete spectrum spans from striking shades of bronze and silver through brilliant reds and pastel blues to traditional white, with virtually every colour and finish in between.

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Warmcore - Lee uPVC
Pilkington - Lee uPVC
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