Doors
Back doors
A back door fitted typically costs £700 to £1,900 depending on material. Back doors get far heavier use than front doors and are more often targeted in a break-in because they are out of sight, so the locking specification matters more here, not less.
The back door is the one people economise on. It is also the one that gets used most and is least visible from the street, which is a combination worth thinking about.
Indicative guide, not a quote
per door, supplied and fitted
£700 – £1,400
These figures come from published industry price guides, not official statistics, and several of those sources are installers or comparison sites with a commercial interest. They are a starting point for a conversation, not a quote. Your installer sets the actual price after measuring.
MyJobQuote door installation cost guides · checked 2026-10-09
Use, not appearance, drives the specification
A back door may be opened dozens of times a day, often with wet hands, muddy boots or an armful of shopping. Hinges, the handle and the lock cycle far more times than a front door's will.
That argues for adjustable hinges, a robust multi-point lock and a frame reinforced well enough that the door does not drop. Dropping is the usual reason a back door stops locking.
Security where nobody is watching
Back and side doors are frequently the point of entry precisely because they are screened from the street by a fence, a gate or an extension.
The same measures that protect a front door apply, and arguably matter more: an anti-snap cylinder to TS007 three-star or Sold Secure Diamond, laminated glass in any pane near the handle, and long frame fixings into the structure rather than into the plaster.
Glazing and cat flaps
Back doors are often heavily glazed, which lights a kitchen that otherwise gets little. Keep laminated glass near the lock and use obscure glass where the door is overlooked.
If you want a cat flap, specify it with the door rather than cutting one afterwards. Cutting a composite or uPVC panel on site can void the guarantee and compromise the panel's structure.
Back doors: common questions
- Should a back door be composite or uPVC?
- uPVC is perfectly reasonable for a back door and is the cheaper choice. Composite is more solid and worth it where the door is isolated, heavily used, or the main entrance in practice.
- Why does my back door stick in summer?
- Thermal expansion plus a door that has already dropped slightly on its hinges. Adjustable hinges usually resolve it; a door that needs lifting to lock is telling you the same thing.
- Can I have a cat flap in a new back door?
- Yes, but have it fitted by the manufacturer as part of the order. Cutting a panel on site can void the guarantee and weaken the door.
Other doors
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Front doors
£900 – £2,350 fitted
A new front door costs £700 to £2,800 fitted. Composite, uPVC, aluminium and timber compared, and why the lock matters more than the door.
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Composite doors
£900 – £2,350 fitted
Composite doors cost £900 to £2,350 fitted. Solid timber core versus foam, what thickness to ask for, and the security specification worth insisting on.
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uPVC doors
£700 – £1,400 fitted
uPVC doors cost £700 to £1,400 fitted. Where they make sense, why cheap ones drop on their hinges, and the cylinder upgrade worth paying for.
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Aluminium doors
£1,400 – £2,800 fitted
Aluminium doors cost £1,400 to £2,800 fitted. Why the material handles tall, heavily glazed doors, and how to match it across the house.
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Bi-fold doors
£3,000 – £7,500 fitted
Aluminium bi-fold doors cost £3,000 to £7,500 fitted. Panel counts, why you need a traffic door, and how they compare with sliding doors.
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Sliding patio doors
£1,500 – £4,000 fitted
Sliding patio doors cost £1,500 to £4,000 fitted. Bigger panes than bi-folds, no lost space, and why lift-and-slide changes how they feel.
TrustedGlazing does not make, supply or fit windows and doors, and the prices above are published industry guides rather than our own. We match your enquiry to one vetted local installer, who quotes and contracts with you directly.