The front door is the one product on a job the customer sees every single day, so it's worth getting the material right. Three cover almost every entrance-door project we supply: GRP composite, aluminium composite and uPVC. All three are secure, weatherproof and low-maintenance — the differences are in the look, the feel, the thermal number and the price. Here's how to steer it.
The short answer
Choose GRP composite for the best all-round front door — warm, solid, secure and available in traditional or modern styles. Choose aluminium composite for a premium, contemporary door with the crispest lines and the widest colour freedom. Choose uPVC when budget leads and the opening is standard.
What "composite" actually means
A composite door is built from several materials bonded together — typically a solid timber or foam core, reinforced framing and a tough outer skin — so it gets strength, insulation and a quality finish in one slab. The skin is where GRP and aluminium composite differ:
- GRP composite uses a glass-reinforced plastic skin, usually moulded with a woodgrain texture. It's the classic "composite door" most customers picture.
- Aluminium composite wraps the core in a powder-coated aluminium skin, giving a flat, ultra-modern face and the same colour freedom as an aluminium window.
uPVC doors, by contrast, are a hollow multi-chamber plastic profile with reinforcement — lighter and cheaper, but without the solid, dense feel of a composite.
Security
All three can be specified to PAS 24 enhanced security and fitted with a multi-point lock, and that's what really matters — the locking, cylinder and hinges do more for security than the skin material. That said, the solid core of a composite door resists physical attack better than a hollow uPVC profile, which is why composites dominate where the customer's priority is "as secure as it looks." For new dwellings, remember Approved Document Q makes PAS 24 security a legal requirement — spec accordingly.
Thermal performance
The insulating foam or timber core makes composite doors strong performers, and modern uPVC doors are close behind thanks to their chambered profiles. All three comfortably meet the Approved Document L requirement for a replacement door (a U-value of 1.4 W/m²K or lower). For the very best number, a GRP composite with an insulated core edges it; for a demanding aluminium-composite spec, ask for the thermally broken option.
Looks, colour and finish
| GRP composite | Aluminium composite | uPVC | |
|---|---|---|---|
| Style | Traditional or modern | Contemporary, flat, slim | Traditional domestic |
| Surface | Moulded woodgrain | Smooth powder coat | Woodgrain foil or white |
| Colour range | Wide, fixed palette | Virtually any RAL | White plus foils |
| Finish life | Long, colour-stable | Very hard-wearing | Foil can fade over decades |
If a customer wants a specific RAL to match anthracite windows, aluminium composite gives you an exact match that will still look sharp in 30 years. If they want a warm, traditional front door in a heritage colour, GRP composite is the natural pick.
Cost
uPVC is the most affordable and remains the volume choice for budget-led replacement work. GRP composite sits in the middle and is where most homeowners land — a clear step up in feel and security without the premium price. Aluminium composite is the most expensive, carrying the cost of the metal skin and the powder-coat finish, and suits the premium end of the market. Be clear with the customer about where the extra money goes and most will happily pay it for the front door.
Lifespan and maintenance
All three need nothing more than an occasional wipe-down and a drop of oil on the hinges and cylinder. On longevity, aluminium composite leads thanks to the powder-coated metal skin, GRP composite is close behind with a colour-stable finish that won't rot or warp, and uPVC has the shortest practical life, with white showing its age soonest. For a "fit it and forget it" front door, a composite justifies its premium.
How to steer the conversation
- Best all-round front door: GRP composite.
- Modern look, exact colour match, premium feel: aluminium composite.
- Budget-led, standard opening: uPVC.
- Maximum security feel: either composite over uPVC.
- New-build (Document Q applies): spec PAS 24 whichever you choose.
You don't need three suppliers to cover the three materials. We carry GRP composite, aluminium composite and uPVC doors side by side, so whichever the customer picks — or if a job needs a mix across several properties — it comes back as one quote on one delivery.
