Composite Doors Explained, and How to Pick the Right One

A moulded glass reinforced plastic skin on both faces, a dense core of solid timber laminate or high density foam between them, and a reinforced frame around the lot. The colour and woodgrain are moulded into the skin rather than painted on. It is that layered build that gives the door its weight and its insulation.

They should not. There is no solid timber face to take on moisture, so the door does not swell shut in wet weather or shrink away from the seals in a hot spell. If a composite door ever starts to catch it is almost always the hinges or keeps wanting a small adjustment rather than the slab itself moving.

They are built to shrug off UK weather for decades, and there is no repainting cycle to keep on top of. Our 10-year guarantee covers our installation work, and the doors themselves are covered by manufacturer warranties. Realistically the hardware shows its age first, and handles and cylinders are easy to swap.

The colour runs through the GRP skin rather than sitting on the surface, so it cannot flake or peel the way paint does, and modern skins are UV stable. A very strong shade on a south facing front may soften a touch over many years, which is one reason mid greys, greens and blues stay popular around here. A wash down twice a year keeps the finish looking fresh.

Warm soapy water and a soft cloth, and nothing abrasive or solvent based on the skin or the glass. Once or twice a year put a drop of light oil on the hinges and a dry lubricant in the cylinder, and wipe the rubber seals so grit is not sitting on them. That is genuinely the whole job.

Three things working together. The core is solid rather than hollow, the outer skin is much tougher, and composite doors come with multi point locking as standard. The weak point on any door is the cylinder, so pair the door with an anti snap cylinder and you have covered both the brute force and the sneaky approach.

From the street they look similar, which is most of the appeal. The difference shows over the next ten years: timber wants sanding and repainting and moves with the seasons, while a composite door stays put and only wants washing. What timber keeps is repairability, since a joiner can plane and fill a solid door in a way you cannot with a moulded skin.

Yes, that is a dual colour door and it is a common request. Most people go bold outside, anthracite, green, red or blue, and keep white or a light woodgrain inside so the door sits quietly in the hallway. It carries a modest uplift over a single colour door, and we itemise it on the quote rather than burying it.

Clear, obscure or decorative, and the choice changes the character of the door completely. Obscure glass brings light into the hall without anyone seeing through, while leaded and stained designs suit older terraces and semis. Glazing in and beside a door is specified as safety glass where the regulations call for it, so it is not a compromise on a house with children.

They are made to measure, which is why we survey the opening before anything is ordered. That matters most in the older housing stock around Wigan and Atherton, where original openings are rarely square or a neat modern size. A made to measure slab and frame means no packing gaps and nothing trimmed on site.

Yes, and it is worth thinking about if your hallway is dark or your opening is wider than a standard door. A glazed side panel throws far more light into a hall than extra glass in the door itself does, and a top light works where the opening is tall. Both are measured and made as one unit with the door so the frame lines up.

Handles, letterplates, knockers, spyholes and hinges come in matching families, typically chrome, satin, black or gold. Black tends to sit well on grey and green doors, chrome and satin on white and lighter finishes, and gold suits traditional panel styles on older houses. Pick one finish and carry it across every piece of ironmongery on the door.