Composite Doors vs Aluminium Doors
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20267 minute read
Short answer
Composite doors generally offer better insulation and a warmer, more traditional appearance for a lower price, while aluminium doors suit contemporary homes and slimline designs but usually cost more and can feel colder to the touch. Both are durable and low maintenance.
Aluminium doors have become popular for contemporary new-builds and extensions, often paired with bifold doors. This guide compares them with composite doors so you can see which suits your home and budget.
Style and design
Aluminium doors typically have slim sightlines and a minimal, modern look, often used where large glazed panels or a contemporary aesthetic are wanted. Composite doors offer a wider range of traditional and semi-traditional panel designs with woodgrain textures, making them a better match for period or classic-style homes.
Thermal performance
Composite doors typically have a denser insulating core, which generally gives better thermal performance than an aluminium door of similar thickness, since aluminium conducts heat more readily than a GRP-and-foam construction. Aluminium doors can be built with thermal breaks to reduce this, but it adds to the cost.
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Security
Both door types can be specified with multi-point locking and strong hardware, so security levels are broadly comparable when specified well. The deciding factor is usually the quality of the hardware and installation rather than the base material itself.
Cost comparison
Composite doors in Cornwall typically cost £1,395–£2,795 fitted. Aluminium doors are often more expensive, particularly for bespoke or large-format designs, reflecting the different manufacturing process and typical use in higher-spec projects.
Maintenance
Both are low maintenance compared with timber. Aluminium doors resist corrosion well thanks to their powder-coated finish, and composite doors need little beyond occasional cleaning. Neither needs repainting in normal use.
Which suits your home?
If your home is contemporary, with large glazed openings or a minimalist look elsewhere, aluminium may suit the overall style better. For most traditional or semi-traditional Cornwall homes, a composite door offers a better balance of insulation, appearance and price.
Frequently asked questions
Do aluminium doors feel cold in winter?
Aluminium conducts heat more than a composite door's insulated core, so without a thermal break an aluminium door can feel cooler to the touch in winter. Good quality aluminium doors include thermal breaks to reduce this effect, but it adds cost.
Are aluminium doors more secure than composite?
Not inherently — security depends mainly on the locking hardware fitted rather than the base material. Both composite and aluminium doors can be specified with strong multi-point locks and anti-snap cylinders.
Why are aluminium doors more expensive?
Aluminium doors are often bespoke, use thermally broken profiles, and are commonly paired with large glazed sections, all of which add to manufacturing cost compared with a standard composite door.
Can I get a composite door with a modern, minimal look?
Yes, several composite ranges include flush, minimal-panel designs that suit contemporary homes, giving a similar clean look to aluminium at a lower price point.
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