Fixing Common Composite Door Problems
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20265 minute read
Short answer
Common composite door problems include stiff or misaligned locks, draughts around the frame, handles that feel loose, and doors that catch on the frame after seasonal movement. Basic cleaning and annual lubrication prevent many issues, but mechanical faults with locks, hinges or alignment should always be diagnosed and fixed by a professional.
Composite doors are built to be reliable for decades, but like any mechanical assembly with moving parts, occasional issues can develop. Knowing what's causing a problem helps you decide what to do next — and when to get help.
Stiff or hard-to-turn locks
A lock that's become stiff is often down to a build-up of dust and grit, or simply needing lubrication after a long period without any. It can also indicate the keeps have shifted slightly out of alignment. Rather than forcing the key or mechanism, which can snap components, book a professional to inspect and adjust it.
Doors that catch or won't close smoothly
Timber-framed and older properties naturally move slightly with the seasons, which can cause a door to catch on the frame or need extra force to close. This is usually a hinge or alignment adjustment a professional can resolve quickly, rather than a fault with the door itself.
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Draughts around the frame
A draught can come from worn compression seals, a door that's dropped slightly on its hinges, or a locking mechanism not fully engaging all points. Identifying which of these it is makes a real difference to the fix, which is why a proper inspection is more reliable than guesswork.
Loose or worn handles
Handles see constant daily use and can develop play in the mechanism over years. This is a straightforward fix for a professional but isn't something to adjust yourself, as incorrect reassembly can affect how the multi-point lock engages.
When it's a guarantee matter
If a genuine manufacturing fault is identified — for example a defect in the door core or a component failing prematurely — this is typically covered under our 10-year written guarantee. Issues caused by accidental damage, wear from lack of servicing, or misuse generally fall outside that cover.
Frequently asked questions
Should I try to fix a sticking lock myself?
We'd recommend against it. Locks are precision mechanisms, and incorrect adjustment or forcing a key can cause more damage and a more costly repair. A professional visit is the safest and most reliable way to resolve it.
Why is my door letting in a draught even though it looks closed?
This usually means the multi-point lock isn't fully engaging, or the compression seals have worn or compressed unevenly. Both are diagnosable in a short inspection and are common, fixable issues rather than signs of a failing door.
How much does it cost to fix a composite door problem?
It depends entirely on the issue — a lock adjustment costs far less than a hinge or panel replacement. We'll always assess the problem first and give you clear pricing before any work goes ahead.
Is it worth repairing an older composite door, or should I replace it?
Most mechanical issues are repairable and far cheaper than replacement. Full replacement is usually only worthwhile if the door core itself has failed or been significantly damaged, which is uncommon on a well-maintained door.
Explore next
More maintenance advice
- How to Maintain Door HardwareHandles, hinges and locking mechanisms benefit from a small amount of routine care each year to keep them operating smoothly.
- Composite Door Warranty GuideUnderstanding what your guarantee covers — and what it doesn't — helps you get the most from your composite door for years to come.
- Can Composite Doors Be Repaired?Most composite door issues are fixable without needing a full replacement, provided the right diagnosis is made early.
