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What are composite doors?

August 31, 2026

If you’ve been shopping for a new front door, you’ve probably come across the product Composite Door.

Composite Doors are now the most popular choice for UK homeowners replacing their entrance door, largely because of what’s going on underneath the stylish exterior.

So what exactly is a composite door made of, and why does it perform so much better than a traditional timber or uPVC door? We stock the Apeer range, so we’ll use their doors to show you exactly what’s happening layer by layer.

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What Is Composite?

A composite door isn’t made from a single material; it’s built from several materials bonded together, each one doing a specific job. Rather than relying on one material to handle everything (where timber and standard uPVC doors do not offer as much performance), a composite door spreads the workload:

One layer handles strength, another handles insulation, another handles weather resistance, and so on.

So What's Inside?

A Reinforced Core

At the heart of a composite door sits an engineered core rather than a single slab of anything. In Apeer’s 70mm range, that’s a super-strong, steel-reinforced polyurethane core with a vertical steel bar running top to bottom along the inside edge – a genuinely engineered solution. The 44mm range takes a slightly different route: a high-density LVL (laminated veneer lumber) engineered timber core, paired with a high-strength reinforced polymer insert, designed specifically to stop anyone cutting through the door. Either way, the point of building the core up in layers rather than using solid timber is the same – it stops the door warping, bowing, or twisting as the seasons change.

A GRP Outer Skin

Wrapped around the core is a tough Glass Reinforced Plastic (GRP) skin. This is the outer layer you actually see and touch. It’s moulded to replicate real wood grain, right down to the panel detailing, and it gives the door its impact resistance while protecting everything inside from rain, UV, and general wear.

Insulating Foam (and a lot of it)

The gaps inside an Apeer70 are filled with a high-strength, highly insulating polyurethane core, and the whole door-and-frame set comes in at a substantial 98mm thick. This is noticeably more than most similar doors on the market.

That’s part of why Apeer70 is independently tested and rated A++, about as good as a front door gets This thermal-imaging comparison shows heat visibly escaping through a timber-core door, while the Apeer70 stays cool across the surface. The Apeer44 uses the same principle in a slightly slimmer profile and still earns a B energy rating, one of the highest in its category.

The Glazing

Where a composite design includes decorative glass, it is built as its own sealed unit rather than dropped straight into the panel.

Apeer70 glass is triple-glazed (with the option of gas-filling and Low-E glass for extra performance), and the whole assembly sits in a double-rebated, twin-seal construction that’s virtually airtigh. There’s even a secondary internal seal on top of the main one!

Apeer44’s glazing is toughened, double glazed and Kitemarked, with weather deflectors fitted to keep the elements out.

The Frame & Hardware

Apeer doors are built with a multi-chambered frame. On the 70mm range, hardened steel hinge bolts make it virtually impossible to force the door or lift it off its hinges.

Every Apeer door – 70mm or 44mm – comes with a multi-point Yale locking system (two rollers, three hooks, two deadbolts and a latch), securing the door from top to bottom rather than at a single point.

Why materials matter above looks

It’s easy to choose a door purely on colour and glass style, but the value is really in this layered structure. A well-specified composite door will:

Stay true to shape year after year, without the swelling, cracking, or fading that plagues solid timber doors in British weather.
Keep your hallway noticeably warmer. Apeer70's A++ rating and Apeer44's B rating both come directly from that thick, insulated core rather than a coat of paint.
Stand up to attempted break-ins: Apeer doors meet Police-approved security standards, and the 70mm range also carries Secured by Design accreditation when specified with laminated glass.
Need next to no upkeep — a wipe with warm, soapy water is all Apeer recommend to keep the outer skin looking new.

Apeer also back their doors with an anti-burglary cylinder snap guarantee, run jointly with Yale (and Ultion on the 70mm range): register your lock within the specified window and you’re covered up to £2,000 if it’s ever defeated by cylinder snapping — a good sign of how much confidence the manufacturer has in their own construction.

Not all composite doors are equal

One thing worth knowing: the quality of these materials and how well they’re bonded together varies a lot between manufacturers. A thicker, properly engineered core, a genuinely high-density foam or LVL fill, and a reinforced frame all cost more to produce than the budget alternatives, but they’re the difference between a door that performs for decades and one that starts to feel tired within a few years.

It’s exactly why we work with Apeer composite door products.

The A++ rated 70mm door offers maximum energy performance and security, and the B-rated 44mm range is a great choice if you want that same engineered build in a wider choice of contemporary styles, colours and hardware finishes, which includes 27 standard and premium colours, plus RAL/BS colour matching if you have something specific in mind to match your home.

Ready to see an Apeer door for yourself?

Now that you know what’s really going on beneath the surface, it’s easy to see why composite doors (and Apeer’s in particular) have become the go-to choice for homeowners who want style, security, and warmth without the maintenance.

If you’d like to see the Apeer70 or Apeer44 range in person, get a feel for the colours and hardware options, or just talk through what would suit your home, get in touch with us today. Our team is happy to help you find the right fit, and you can request a free, no-obligation quote.