What each door actually is
A uPVC door is a reinforced plastic frame with insulated panels, light, low-maintenance, and the cheapest way to replace a tired door with something secure and weathertight. Its weaknesses are feel and fade: big flat panels can flex, and strong colours soften over years of sunlight.
A composite door is a sandwich: an insulating core wrapped in a tough skin, typically GRP, hung in a frame that matches the windows. The construction makes it stiffer, quieter to close and better insulated than uPVC, and the moulded finishes carry colour and woodgrain convincingly enough that most modern front doors you admire on a street are composites.
Where each one wins
Choose uPVC when budget leads, for side and back doors where feel matters less, and for rentals where the job is weathertightness and security per pound. White uPVC alongside white uPVC windows also keeps a visual consistency that a lone feature door can break.
Choose composite when the door is the face of the house, when you want colour that lasts, and when solidity is part of what you are buying. The premium over uPVC is real but modest against the lifetime of the door, and both, fitted as replacements, fall under the same building regulations regime as windows, with the same certification to keep, as covered in the window paperwork explained.
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Compare window and door quotesComparing door quotes like for like
Two composite door quotes can name the same colour and differ on everything that matters: the core material, the locking hardware, the glazing around the door, and whether the frame and threshold are included. A cheaper quote is sometimes a thinner specification rather than a better price, so ask each installer to itemise what is in the slab, the frame and the lock.
Security is worth one direct question: what standard does the door and its lock meet? A confident answer, and a multi-point lock as standard, is the baseline to expect. Then compare quotes from trusted window and door installers with the specification pinned down, and the price difference finally means something.
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Up to three trusted window and door installers quote for the work. Free, no obligation.
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