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Composite doors also provide the freedom of choice with regards to the door colour, glazing type, hardware colour and styles. Although looks and thermal performance are important, the security aspects of an entrance door cannot be overlooked as according to Home Office official crime statistics, 67% of burglars break in through the door. At Trade Windows 4U all composite doors are manufactured in accordance with Secured by Design, a Police-backed accreditation. This ensures that composite doors are installed within a reinforced door frame and secured with a multi-point lock with two hooks, two finger bolts and a deadbolt.

The end result is a door that not only looks great, but has excellent thermal efficiencies and keeps your home safe and secure. We are more than happy to offer help and advice on your replacement door requirements or upcoming projects and when you look at your new composite door, remember… There’s more than meets the eye!

The wooden door used to be the popular choice for entrance doors due to the finish and style of the doors. One of the problems with wooden doors, other than the lack of thermal efficiency is that there is a lot of upkeep required. Whether it be sanding the door down or re-painting it, at some stage during a wooden doors’ life there were guaranteed maintenance issues. A feature of composite doors is that the wood-effect is still retained whilst removing the necessity of constant upkeep.

This is done by the GRP (Glass Reinforced Plastic) layer or skin of the door which is taken from a mould of real wood to give an authentic woodgrain effect. Used also in the transportation industry, GRP is extremely durable and as a skin for a composite door results in a weatherproof door which has excellent resistance to knocks and scratches. Another feature of the composite door is that they won’t twist, warp or split keeping the maintenance down to an absolute minimum. You won’t need to paint or varnish them and an occasional wipe over with a damp cloth will keep composite doors looking as good as new.

It is due to this mixture of components that give composite doors their impressive lifespans. The table below indicates how the GRP composite door matches up against other entrance doors.

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Composite door lifespan

Highly customisable, highly secure

What makes a Composite Door?

Highly durable, low maintenance

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The U-Value is a measurement of thermal conductivity shown as W/m2k (watts per square meter, per degree Kelvin) and determines how quickly heat is transferred by the window or door either into or out of the building. Essentially, the lower the U-Value, the more efficient a product is as a heat insulator.

I wouldn’t blame you for not really paying too much attention to an entrance door or thinking about anything other than does it do the job and does it look right? But there really is more than meets the eye with a composite door and they are accepted in being the future for entrance doors.


As of October 2010, as part of the Government’s commitment of the conservation of fuel and power, certain regulations had to be met for both replacement windows and doors. These regulations stipulated that replacement doors had to be of a U-Value of 1.8 or below.

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As the name suggests, composite doors are manufactured using various products based on their efficiencies. Composite doors achieve their U-Value primarily by having a thicker door slab which comprises of a high insulation foam core. Timber inner frames provide the sturdiness and stability of the door whilst the PVC outer frame and weather seals keep the door secure across the doors’ edge.

Not only do composite doors provide thermally efficient qualities to meet energy rating standards they also reduce noise and keep out draughts which essentially keeps your house warm and sheltered.

Composite door slab

How do Composite Doors achieve this?

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