Almost every front door quote in the UK comes down to these two. Composite doors have taken over the market and are frequently sold as the automatic upgrade, but uPVC has not stood still and there are plenty of houses where it remains the sensible choice.
This guide compares them on the things that actually matter over twenty years, not just on how they look in a brochure.
What each one is made of
uPVC doors
A uPVC door is a welded plastic frame with a reinforced panel or glazed infill. Modern profiles are multi-chambered and steel-reinforced, which makes them far stiffer than the doors people remember from the 1990s. They are light, cheap to make and easy to repair because parts are standardised.
Composite doors
A composite door is a thick solid slab — timber, high-density foam or a mix — wrapped in a moulded glass-reinforced plastic skin, hung in a uPVC or aluminium frame. The slab is typically 44–48mm thick against roughly 28mm for a uPVC panel, and that is what gives the door its solid feel and thud when it closes.
Head to head
| uPVC | Composite | |
|---|---|---|
| Typical fitted price | £650 – £1,000 | £950 – £2,600 |
| Slab thickness | ~28mm panel | 44 – 48mm solid |
| Expected lifespan | 15 – 20 years | 25 – 35 years |
| Colour retention | Good in white, fair in foils | Excellent |
| Thermal performance | Good | Very good |
| Security | Good with the right lock | Better slab resistance, same lock options |
| Sound insulation | Fair | Better |
| Repairability | Easy and cheap | Slab damage usually means replacement |
| Weight on hinges | Light | Heavy — needs quality hinges |
Where uPVC still wins
- Back doors, utility doors and side entrances where footfall and appearance matter less.
- Rental properties where cheap, fast repairs beat longevity.
- Flats with restricted access where a lighter door is easier to fit and hang.
- Any budget where the choice is a good uPVC door versus a bottom-end composite — a well-specified uPVC door beats a thin hollow composite every time.
Where composite is worth the extra
A composite door earns its money on a main entrance that gets weather, traffic and attention. The extra mass makes the house quieter, the skin holds a dark colour that would look tired on foiled uPVC after a decade, and the slab is much harder to kick through.
It is also the right call if you want a specific style — a period-look door with mouldings and decorative glass reads far better in composite than in a flat uPVC panel.
Security: the part that actually matters
Neither material makes a door secure on its own. Break-ins through doors are overwhelmingly attacks on the cylinder, not the slab. Whatever door you buy, specify a three-star anti-snap cylinder, or a two-star handle over a one-star cylinder, and a multi-point lock with hooks rather than rollers alone.
Ask the installer to demonstrate the door locking with a single lift of the handle and a smooth key turn. A door that needs to be pulled or shouldered is a door whose hooks are not fully engaging.
Maintenance over twenty years
| Task | uPVC | Composite |
|---|---|---|
| Cleaning | Warm soapy water, 2 – 3 times a year | Same |
| Lock lubrication | Annually | Annually |
| Hinge adjustment | Every 2 – 3 years | Every 2 – 3 years, more critical due to weight |
| Seal replacement | Around year 10 | Around year 12 – 15 |
| Repainting | Not possible | Not required |
Our take
For a front door that will be looked at and used every day, a mid-range composite is usually the better twenty-year purchase. For a back door, a good uPVC door does the job for a lot less. We fit both across Central Scotland and are happy to say when the cheaper option is the right one.
Common questions
On a main entrance, generally yes over the life of the door. On a rarely used side door, generally not.
Want a straight answer on your own windows or doors?
DM Installations fits and repairs windows and doors across Central Scotland — Cumbernauld, Glasgow, Falkirk, Stirling and the surrounding towns. Free survey, written quote, and an honest answer on whether you need a repair or a replacement.
Related guides
Composite Front Door Cost
Fitted composite door prices, the extras that add up, and how to tell a well-specified door from a cheap one.
When to call a proDoor Lock and Security Problems
Failing gearboxes, snappable cylinders and the cheap upgrades that make the biggest difference to door security.
How-toHow to Adjust a uPVC Door
Which screw does what on flag, butt and rebate hinges, and how to get a dropped or sticking door closing properly again.