Buyer's guide

Composite vs uPVC Doors: which is right for your South Wales home?

Composite and uPVC are the two doors we get asked about most across Caerphilly, Cardiff and the Valleys. Both are good products. They solve different problems, at different price points, and one is usually a much better fit for a given house than the other. Here's how we walk customers through the decision.

Quick verdict

• Front door, kerb appeal matters: composite.
• Back / utility / side door on a budget: uPVC.
• Coastal property (Barry, Penarth, Sully): composite — GRP holds up to salt air far better.
• Period Valleys terrace, listed-style brief: composite in a heritage colour with a stable door option.

Security

A composite door has a solid timber core, two GRP (fibreglass) skins and a high-density foam insulation layer between. That's the same construction class used on most new-build front doors that need to meet Secured by Design / PAS 24. uPVC is a hollow plastic shell with steel reinforcement — fine for a back door, but easier to defeat than composite when targeted.

Insulation & energy

Composite typically hits U-values around 1.0–1.4 W/m²K. uPVC sits in the 1.4–1.8 range. On a south-facing Cyncoed front door the difference is marginal. On a north-facing Pontypridd terrace where the wind tunnels up the valley, you'll feel the composite improvement on day one.

Looks & finish

Composite is moulded — you get a convincing woodgrain texture, a much wider colour range (anthracite, chartwell green, navy, oak), and matching glass options that uPVC can't quite reach. uPVC looks like what it is: plastic. Fine in white on a 1990s estate; less convincing on a Victorian bay-fronted terrace.

Price

Roughly: a fitted uPVC front door in South Wales runs £900–£1,400. A like-for-like composite is £1,400–£2,200 depending on hardware, glass and colour. Add £150–£300 for a sidelight, more for full-height transoms.

South Wales weather considerations

Coastal sites take more UV and salt; valley sites take more sideways rain and freeze-thaw. Both eat cheap uPVC seals within a decade. For coastal homes specifically — Barry, Penarth, Sully — we'll almost always recommend composite with a 10-year colour-stable warranty.

FAQs

Are composite doors worth the extra cost over uPVC?

For most South Wales front doors, yes. A composite door costs roughly 40–80% more than a like-for-like uPVC door, but lasts longer, insulates better and carries a much heavier security spec. On a back or utility door where kerb appeal matters less, uPVC is still a sensible choice.

Which is more secure — composite or uPVC?

Composite. A solid timber core wrapped in GRP resists kicks and crowbars in a way a hollow uPVC slab can't match. Both can be specced with PAS 24 / Secured by Design multi-point locks, but the door slab itself is the weak point on cheaper uPVC.

How do they compare on insulation?

Composite doors typically achieve U-values around 1.0–1.4 W/m²K vs 1.4–1.8 for uPVC. In a draughty Valleys terrace that's a noticeable difference on the hallway temperature — and on the heating bill.

Will the colour fade in coastal Barry or Penarth weather?

Modern composite GRP skins hold colour for 15+ years even in salt-laden coastal air. uPVC foiled finishes (anthracite, Chartwell green) can chalk or fade sooner when south-facing. We spec UV-stable foils on both — ask for the warranty terms specifically.