Home → Doors → Doors FAQs → What are composite doors made from?

Composite doors are unique and specially manufactured doors that look like natural hardwood doors. However, these popular doors are actually made from compression moulded Glass Reinforced Polymer (GRP), polyurethane foam insulation and ABS reinforcement. Composite doors, therefore, are stronger, warmer and more energy efficient than other materials. These properties make them a perfect choice for a front door.

At KLG, all of our front doors are made from composite materials. We manufacture them from scratch here in the UK to ensure that the quality of the finish always meets our high expectations. The way that our composite doors are made, including both the materials and the processes, makes them durable and long-lasting. They retain their stunning appearance all year round and make houses both attractive and secure.

What are composite doors made from?

There are a number of different ways that a composite door can be made. To qualify as a composite material, the door simply needs to be made from multiple different materials – often some combination of wood, plastic and foam. Different composites have different properties, with some being notably stronger and more secure than others. KLG has invested in developing composite doors that are not only stronger than those of some other manufacturers, they also have a stunning coloured wood-effect appearance.

KLG Rutland’s composite doors contain various layers that work together to increase their sturdiness, strength and insulating properties. The outer layer of a composite door is made from Glass Reinforced Polymer, which can be manufactured to have a coloured wood finish that’s almost indistinguishable from natural wood.


The middle of the door is filled with environmentally friendly polyurethane foam, adding extra insulation without significantly increasing the weight of the unit. Finally, a layer of ABS plastic reinforcement runs through the centre of a composite door, giving it increased strength and security

Along with their increased stability and security of composite doors, the flexible manufacturing process allows us to offer bespoke door designs. You can choose the colours and patterns that you like the best.

At KLG Rutland, we also offer a diverse range of charming decorative glass for a beautiful finish. This allows you to personalise your door and create the ideal welcome to your home. Because of the way composite doors are made, we can actually change the glass panel without any trouble if our customers want to make a change later in the door’s lifespan.

Advantages of composite doors

Longer lifespan

The average lifespan of our composite doors is 30+ years (and KLG’s warranty lasts for 10 years), due to the high quality and durability of the materials used to make them They require very little maintenance – an occasional wipe down will be enough to keep them looking as good as the day they were installed.

Safe and secure

The most fundamental requirement of your front door is that it must keep your home secure at all times. The majority of composite doors (including all doors made by KLG Rutland) have multi-point locking systems that make your composite doors as secure as possible. The strength of the materials used in their manufacture also adds to the overall security benefits. This is one of the main advantages of the ABS sheet that runs through the door’s centre.

KLG Rutland combines the strength of our doors with the safety provided by locks that have been approved by the Secured By Design initiative. This means that the locking mechanism – which can be a weak point on other doors – is as secure as the rest of the door.

Different styles

Composite doors can be manufactured in a number of different styles depending on your requirements. Various fittings available from KLG Rutland include distinctive letterboxes, lock fittings and handles to ensure your door is completely bespoke.

Thermal adaptability

KLG’s composite doors have been designed to be highly weather resistant. Given the famously unpredictable nature of the UK’s weather system, a robust sealing system on all composite doors can allow for a more thermal efficient home.