Are composite doors better than uPVC? An installer's honest verdict

A composite door is the better door in almost every measurable way — security, insulation, lifespan, kerb appeal. A uPVC door is the better value door if budget is the main driver and the opening is well-protected (rear of the house, porch behind it, etc.).

Typical fitted prices in Leicester right now: composite from £1,099, uPVC from £799. The £300 gap usually pays itself back inside 8–10 years through energy savings and the longer replacement cycle.

Price fully fitted in Leicester: composite from £1,099, uPVC from £799. Security: composite is PAS 24 tested as standard, on uPVC it is an upgrade. Thermal U-value: composite 1.0–1.4 W/m²K, uPVC 1.6–1.8 W/m²K. Panel thickness: composite 44–48mm solid core, uPVC 24–28mm foam-filled.

Colour: composite offers 18 standard finishes plus 200 RAL and dual colour; uPVC offers 12 standard plus RAL foils. Realistic lifespan: composite 30+ years, uPVC 15–20 years. Weather resistance: the composite GRP skin does not warp or fade, while uPVC can discolour on south-facing elevations over time.

Pick composite if it is the front door and kerb appeal matters, the elevation is south-facing, you are staying in the house 10+ years, or security is a genuine concern (rear alley, ground-floor flat, corner plot). Pick uPVC if it is a back or side door out of public view, a rental property, or budget is the deciding factor.

Our honest Leicester recommendation: nine times out of ten we fit a composite front door and a uPVC back door on the same house. We flip that for HMO landlords, corner plots with alley access, and any house where the back door has already been targeted.

A composite door is a solid 44–48mm slab made by sandwiching different materials: a high-density timber or polyurethane foam core, an insulated steel or aluminium reinforcement, and a tough GRP (glass-reinforced plastic) outer skin. It then sits in a uPVC or aluminium frame with multi-point locking.

Because it's a solid slab rather than a hollow extrusion, it doesn't flex when struck, doesn't warp in heat, and doesn't fade noticeably over 10–15 years.

A uPVC door uses the same hollow multi-chambered plastic extrusion as a uPVC window, reinforced internally with galvanised steel and fitted with multi-point locking. Modern uPVC doors are a long way from the 90s versions — frames are stiffer, glazing is thicker (28mm units are standard) and locks are Secured by Design.

uPVC doors are lighter, cheaper to manufacture, and easier to fabricate in awkward sizes. The trade-off is they don't have the same physical mass as a composite slab.

A 44mm composite slab with a TS007 3-star cylinder and a Secured by Design hook-and-bolt mechanism is genuinely difficult to force. uPVC doors with the same lock spec are also hard to force but the slab itself is the weaker point.

In our experience the single biggest factor in a break-in isn't slab material — it's the cylinder. Always specify a 3-star cylinder (anti-snap, anti-bump, anti-drill). On a composite door it's overkill insurance. On a uPVC door it's essential.

A modern composite door achieves U-values around 1.0 W/m²K. A uPVC door comes in around 1.4–1.6 W/m²K. In a draughty 1930s semi the difference is noticeable on the hallway temperature — particularly on north-facing front doors. In a well-insulated newer home with a porch the difference is marginal.

Both doors will outperform the older timber or first-generation uPVC door they're replacing by a wide margin. The real energy win comes from the new seals and the thermal break, not the slab material.

Composite doors typically last 30+ years before the slab needs replacing — the GRP skin doesn't fade or crack and the core doesn't rot. The frame and hardware usually need attention before the slab does.

uPVC doors typically last 20–25 years. Hinges and seals usually go first; the slab itself stays serviceable. After 15–20 years uPVC can yellow on south-facing elevations.

Composite door, fully fitted with removal and disposal: from £1,099. Typical jobs land £1,400–£1,800 depending on glass and colour.

uPVC door, fully fitted: from £799. Typical jobs land £950–£1,299.

Both prices include 10-year insurance-backed guarantee, our own fitters (no subcontractors) and Building Regulations sign-off.

Pick a composite door if it's your front door, you want the longest lifespan, and you care about kerb appeal — particularly if the house is your forever home.

Pick a uPVC door if it's a back door, side door, utility room door, or you're prepping a rental property where budget matters more than 30-year lifespan.

Many of our Leicester customers do exactly this: composite front, uPVC back. It's a good combination.