The brochure shows two doors — one composite and one uPVC — both priced at £900 when fitted. The photos show them looking quite similar, and the sales rep points out that both doors are “high security” and provide similar warranties. It almost feels like the choice comes down to personal preference.
It is not. Both products are at different price points and different quality brackets, and that shows up at different points. You can see the full products at composite doors and uPVC doors. Here is the comparison.
Actual Product
A uPVC Door is like a uPVC Window with a bigger frame. It has a steel core that is 28mm thick and is formed of a tougher plastic sheet. They are cheap, lightweight, and can be manufactured very quickly. They also look like PVC when you are up close to one.
A composite door is quite different. They are also a formed slab but with a core of foam that is much denser and is framed by PVC and a timber frame. They also have two formed skins that are of a material called GRP and are of a much thicker construction, usually around 44 – 48mm. You can also tell a composite door is much denser and behaves more like a timber door.
Everything that follows is shaped by the differences in the construction.
Security
Here is where the products differ.
uPVC doors have a thinner, less rigid slab and (on the cheaper products) reinforced frames that are much weaker. With the right multipoint locking system and a 3-star anti-snap cylinder, they can be designed to meet PAS 24, but would have a much higher base level. Typically, determined would-be door busters would either break the slab, or would breach the frame where the lock is kept.
Unlike uPVC doors, composite doors have thicker denser multi-material slabs that are much more resistant to impacts. To top it off, composite doors have a GRP skin that is hard to breach, a foam core that absorbs impacts, and a frame that provides a solid point of engagement to the lock. Attacks on composite doors fail at either the cylinder or the frame, but not at the slab.
If the concern about security (both on the price and product level) is justified, composite doors are a much better product, especially on corners, ground floor flats or in higher risk areas and for homes that have been broken into before.
Thermal performance
Compared to the difference in security, for thermal performance, the gap is much smaller. A good uPVC door has a U-value of 1.4 – 1.8 W/m²K and composite doors have a U-value of 1.0 – 1.4. Both are compliant with current building regulations, but are better than the minimum.
The gap expands over time. uPVC can warp from heat. After long, hot summers, dark, south-facing uPVC doors can develop gaps in the seals. Composite doors hold heat better, and since they have a GRP skin, they don’t warp as much.
In reality, both offer enough insulation for the house. Composite doors handle extreme cases better.
Appearance and Durability
A uPVC door always looks like a uPVC door. Even the best options with timber-like features and woodgrain skins aren’t convincing up close, since they still look like plastic. uPVC can also yellow, and especially white doors on south-facing walls can be aging eyesores in as little as 15 years.
Composite doors can now pass as timber doors. GRP skins can now hold convincing woodgrain, and the edge can be built to the right thickness at any distance, and with a door in a dark or mid-tone colour, composite doors can look the same as day one even after 15 years.
Composite doors also have a longer lifespan at 25-30 years compared to 15-20 years for uPVC doors. Seals, locks, and cylinders on composite doors will need to be replaced in that time, but the door will be as good as day one.
Price
Projected prices for 2026 in the UK for fitted doors:
- uPVC doors: £400-900 for standard residential replacement doors. There are a very small number of really good quality uPVC doors that are selling over £900.
- Composite doors: for entry-to-mid range, £900-£1,800, £1,800-£2,500 for solid-cored composite (Solidor, Endurance, Comp Door) with bespoke glazing selling for over £2,500.
When comparing prices, consider the £900 overlap. An £900 uPVC door is at the highest level of that range, while an £900 composite door would be at the lowest level for composite doors. That makes them equivalent. Above that threshold, composite doors will be superior to uPVC in every meaningful way.
Where does each door type excel?
Choose uPVC if the budget is tight, the door leads to the low-traffic back or side of the house, the house has matching uPVC windows, or the property owner expects to sell the house before the door reaches its end of life in 15 years.
Choose composite if the door is the front door of an owner-occupied house, security is a concern, there is a desire for improved curb appeal, the property owner wishes to improve the house for the next 10 years or longer, or there is a budget in the range of £1,200+ to have it installed.
For most owner-occupied houses in the UK, composite doors will be the better option of the two. The cost difference is small when spread over the lifetime of the door, and the immediate difference in look and feel is substantial.
How do I decide which one to buy?
If the door is the front door and the budget is £1,200, go with a composite door. The decision is basically made at that point.
If the budget is under £800, find the best uPVC door possible at that price and be okay with the concessions that go with it.
If the budget is in the range of £800-£1,200, both options fit within that budget. Go with composite for improved aesthetics and security. If the goal is to replace an aging door that is used less frequently, uPVC is an adequate option.
For garage doors, staff doors, and utility doors — opening out to whatever the front of the house is — uPVC usually makes most sense. You’re not doing justice to the front of the house by taking the budget on the front door and putting it on the back door.
Anyway, a 3-star anti-snap cylinder is the best value at £80 for any door. Every door you buy, you should buy that.