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What is a composite door and how is it made?

A composite door has a 44mm thick door leaf and is comprised of high-density polyurethane foam, along with a timber sub-frame for extra strength. Aluminium inserts are also used on both sides to prevent the door from warping or bowing excessively. The composite doors are then finished off with a GRP (glass reinforced plastic) outer skin, which is completely immune to sun fade and bleaching.

Both sides of the composite door has a 2.5mm thick grp (glass reinforced plastic) woodgrain outerskin that requires very little maintenance - only an occasional wipe clean with a damp cloth will keep the door looking like new and it will never require painting.

Composite doors are made from a variety of materials including upvc, timber and fiberglass. The most common materials used are high-density foam, upvc and timber as they are strong and durable. Fiberglass is also a popular choice, as it is resistant to moisture and rot. Composite front doors have now become the preferred choice of entrance doors for many homeowners and tradespeople due to the major advantages that composite doors have over the alternative wooden doors, steel doors and upvc doors.

What are the benefits and advantages of composite doors?

Composite doors are exceptionally strong, offer high security, easy to maintain, provide excellent thermal efficiency with a lifespan of at least 35* years and the general look and feel of a composite door make it the most popular external door choice on the market.

Composite door features and performance

* Information from HAPM (Housing Association Provident Mutual) and BRE (Building Research Establishment)

GRP Composite Doors Life Expectancy

Door Type Expected Life Maintenance
Softwood Door 25 Years Paint, 5 Years
Hardwood Door 35 Years Paint, 5 Years
Steel Composite Door 30 Years Wipe Clean
PVC Composite Door 25 Years Wipe Clean
GRP Composite Door 35 Years Wipe Clean
PVC Panel Door 20 Years Wipe Clean

Energy Efficient Outer Door Frame

All our composite doors are supplied pre hung in a upvc outer frame that has energy efficient recycled reinforcement that offers excellent thermal properties.

Composite Door Enhanced Security Features

We know a secure door is important to our customers, and that’s why our range of locks, cylinders and handles adhere to the highest accreditations and industry standards. The combination of these locks and a reliably strong structural frame make our doors unrivalled in terms of the peace of mind they offer. All our doors come with a multipoint locking system and is PAS24 and BS6375 approved and have a kitemarked cylinder lock as standard. Read more about the composite door security features.

woodgrain effect
Boast a timber grain effect

Someone clever once said that quality is in the detail. So what does that tell us about plain, white polystyrene-filled panel doors? The timber effect grain of one of our doors gives a rich, classic style to your house – and a very warm welcome home. Now that is clever.

GRP skinned

To give great definition and long life performance, we use glass reinforced plastic skins. For keeping people safe, secure and protected against all weather conditions. It's used today to make the hulls of boats because its super-strong and has exceptional wind and water resistance. That's why we use it for our composite doors.

grp door skin
edge banding
The edges

The hinge edge of your door has a PVC edging. Then we cut through the edging so that whichever hinge you selected sits neatly inside the edge of your door.

To make the door super-strong, the lock edge has been fitted with a full length of 4mm thick, powder coated aluminium lock strip. Then your preferred lock sits flush inside your door.


Making a door to just hold the glass is easy. But have you ever thought about what happens if the glass unit breaks down in that composite door you fitted?

Our unique and patented glazing cassette can be removed from the inside to let you simply change the glass and reuse the cassette. You won’t need a new door because it has been damaged whilst trying to follow impossible deglazing knacks and techniques! All our grp composite doors are reglazeable.

reglazeable cassette
door colours
Available in a variety of door and frame colours

Would you like your living room or your kitchen to look the same as everyone else’s? We thought not. But with PVC panel doors this limited choice comes as standard for the exterior of your home. Express your style with our wide selection of door colour options.

Contact us at sales@grpcompositedoors.com or give us a call on 01530 515160
For further information about our external doors and lead times, please contact out friendly sales team.

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