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Thermal Upgrade

Triple Glazing for Ultimate Thermal Performance

Choose this option for 75% better thermal performance than standard double glazed aluminium windows.

Fresh Clean Design

Clean modern lines with a refined and understate beauty, Warmcore’s full-width thermal core creates a pristine appearance

Warmer by Design

Warmcore windows combine cutting edge performance with architectural appeal.

More information

Cross Sections


Weather Performance

Q-Lon plyurethane foam seals ensure weather performance, keeping draughts and wind driven rain outside, while keeping you warm inside. Rubber gasket beads provide a secondary weather seal helping Warmcore exceed the requirements of BS6375-1 (the classification for weather tightness on windows and doors).


A U-Value is a measure of heat loss through a structural element. it is calculated on the rate at which heat transfers through 1 square metre of a structure and is stated in W/m2K.




U-Values are used by the construction industry to compare the thermal performance of different materials and products.

Current building regulations require a U-Value of 1.6.

Double Glazing has a U-Value of 1.3.

Warmcore Aluminium windows have a U-Value of 0.8 when combined with triple glazing.

Tilt & Turn

The WarmCore system is available as a tilt and turn window. Ideal for upstairs use, tilt and turn windows can be tilted inwards for ventilation or swung inwards for a wider opening.


Using 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

WarmCore casement windows are available in a ‘flush sash’ option for the ultimate in clean, modern aesthetics.


Using a stepped outer frame, the sash – the opening part of the window – sites on the same plane as the rest of the window, creating a pure, cutting-edge look. Where two flush sashes meet, WarmCore uses a feature mullion, creating a precise bead link in-between the two windows.



Available, as standard in a choice of 2 powder coated colours with other colours available order, WarmCore allows you to pick a different colour for each side of the window.




A choice of 2 external sash and outer frame designed enable you to personalise WarmCore windows. Pencil round gives a softer look, while Square gives a more precise and contemporary feel.