Features & Benefits

WarmCore windows are available in casement and tilt & turn styles, both available with optional flush sash that incorporates a stepped outer frame for really clean of lines and a smooth, architectural finish.

We also supply Wamcore doors, which like our windows are 25% more thermally efficient than traditional aluminium systems.

Thermal Core

The orange thermal core – hidden away in the finished doors – is key to why WarmCore windows and doors are 25% more thermally efficient than traditional aluminium systems.

Superior Thermal Efficiency

WarmCore triple glazed windows can reach U-values as low as 0.8W/m2K. We supply double and triple glazed WarmCore windows and doors.

Slim Sightlines

The flush sash option has the potential to offer attractive sightlines with a flush finish.

Dual Colour Options

At no extra to you, we can supply our WarmCore windows and doors in dual colour options to suit almost any home aesthetic.

Securely Designed

WarmCore can achieve PAS 24 and SBD with a full depth eurogroove that accepts multipoint locking.

Configuration Options

We provide casement, flush casement and tilt and turn WarmCore windows with configurations to suit the needs of your project.

Glazing, Finishes & Specifications

Glazing & Obscure Glass Options

Browse through our range of decorative glazing options. We provide double and triple glazing options for our WarmCore windows and doors.

Oak CU

Profile Colour Options

Finish your WarmCore windows or doors with a choice of powder coated colour for the inside and outside frame. Select Pure White, Anthracite Grey or special colours that are available on request.
RAL colour options


We’ve provided the performance levels of our WarmCore products below.

Performance And Accreditation

WarmCore Windows

WarmCore Doors


1.3 W/m²K

1.4 W/m²K


0.8 W/m²K

1.0 W/m²K


Class 4

Class 4


Class 6a (Casement) Class 9A (Tilt & Turn)

Class 7A / Class 3A (Part M Low Threshold)


Class C3

Class C2


PAS 24

PAS 24







Warmcore Windows

Full Width Thermal Core

Maximises thermal efficiency with lower conductivity material.

Double or Triple Glazing

Double or triple glazing provides  ultra low U-values with WarmCore windows and doors.


Flush Sash Available

Flush sash finish is available for modern aesthetics.

Style Options

WarmCore windows are available with pencil round and square external sash styles, helping you to offer your customers even more choice

Trade Downloads Area

Gain access to our trade downloads area here. At Unique Window Systems, we’re set up to give our trade customers the best advantage. We serve the UK and help you connect with your clients with the right solutions.

WarmCore Media

Find all of the downloads, videos and brochures relating to our WarmCore windows and doors below. We have all the technical information you need for your next installation. Get in contact if there’s anything more you need.

Warmcore Window Brochure pdf

Warmcore Window Technical Brochure pdf

Warmcore Bi-Fold Doors Brochure pdf

Warmcore Patio Doors Brochure pdf

WarmCore Doors Tech Sheet pdf


Discover More Today

See some of the most frequently asked questions that we receive. If there’s anything else you’d like to ask, please get in contact.

Where does UWS supply to?

We can supply the majority of the UK with our innovative, precision engineered products made here in Leicester. Get in contact to learn more about our delivery options.

What are the lead times for WarmCore products?
What window configurations are available?
What door configurations are available?
Why trade with Unique Window Systems?

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