Composite doors are one of the most popular choices for homes across the UK. They look stylish, are extremely durable, and offer superb insulation compared with older timber or cheaper uPVC doors. Many homeowners choose them as a long-term solution, believing that once installed they are maintenance free. The truth is that while composite doors are built to last, they are not indestructible. Over time, locks fail, hinges wear, seals degrade, and sometimes even the glazing can crack or mist. As a specialist in both composite and UPVC door repairs, I want to clear up the common questions around what can be repaired, what needs replacing, and when it is worth calling in an expert like Repair UPVC to put things right.
What Makes Composite Doors Different?
Before we dive into the repairs, it is worth understanding what a composite door is made of. Unlike UPVC doors, which are typically formed of one main plastic shell reinforced with metal, composite doors are a mixture of materials designed to maximise strength and performance. They usually have:
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A timber or high-density foam core for insulation
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Glass reinforced plastic (GRP) or uPVC outer skins for durability
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A steel reinforcement for added security
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Multi-point locking systems as standard
This layered construction makes them strong, secure, and weather resistant. But because they contain different materials and mechanisms, the types of problems you may face are slightly different from standard UPVC doors.
The Most Common Composite Door Problems
At Repair UPVC we are often called out to look at similar recurring issues. These are the most common:
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Dropping and misalignment – Heavy composite doors can sag on their hinges over time. This makes them stick, catch, or become difficult to lock.
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Faulty locks – Multi-point locks are fantastic for security but, like all mechanisms, the internal gearbox or cylinder can eventually fail.
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Broken handles – A stiff lock often causes excessive pressure on the handle, which eventually results in it snapping or becoming loose.
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Worn seals and draughts – Rubber seals do perish with age, leading to heat loss and water ingress.
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Glass issues – Double or triple glazing in composite doors can crack, mist, or let moisture in when the sealed unit fails.
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Faded or scratched surfaces – GRP skins are tough but not immune to weathering or accidental damage.
These problems do not necessarily mean you need a new door. Most can be repaired effectively and affordably.
What Can Be Repaired on a Composite Door?
The good news is that the majority of composite door faults can be fixed without replacing the entire door. With the right tools and expertise, a repair often restores full functionality and security.
Locks and Cylinders
If the key will not turn, the lock is stiff, or the mechanism feels loose, the problem is usually inside the gearbox or cylinder. We can repair or replace these parts without touching the rest of the door. In many cases, upgrading to an anti-snap cylinder is advisable, especially as burglary techniques targeting older locks are unfortunately still common in the UK.
Handles
Handles can be swapped out quickly. Choosing quality replacements ensures smooth operation and a style that suits your property.
Hinges and Alignment
If the door has dropped, adjustments can be made at the hinges to bring it back into place. In more severe cases, we may fit new heavy-duty hinges that are designed to take the weight of modern composite doors.
Seals and Weatherproofing
Worn or damaged seals can be replaced with new ones that keep out draughts, water, and noise. This makes a huge difference to comfort and energy efficiency.
Glass Units
If the glazing in your composite door has failed, the sealed unit can be removed and replaced without changing the entire door. Whether it is decorative glass or plain double glazing, a new unit will restore clarity and insulation.
Surface Scratches and Minor Damage
While major cracks in the GRP skin are difficult to repair, smaller scratches can often be polished out or repainted with specialist materials.
What Can’t Be Repaired on a Composite Door?
While repair is often possible, there are limits. It is better to be upfront about when a replacement might be the only option.
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Severe structural damage – If the core of the door is cracked, rotting, or waterlogged, it is usually beyond economical repair.
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Warping – Composite doors are resistant to warping, but in rare cases of severe heat or moisture damage, the whole slab may need replacing.
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Extensive GRP skin damage – Large holes or deep cracks in the skin compromise the integrity of the door and are very difficult to repair permanently.
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Outdated security mechanisms – Sometimes older composite doors were fitted with locks that are now considered insecure. In these cases, a repair may not bring the door up to modern standards, and replacement may be the best option.
Why Choose Repair Over Replacement?
According to the latest figures from Checkatrade, the average cost of a new composite front door installation in the UK is between £1,200 and £1,800 depending on style and quality. Compare that with the average cost of a professional repair, which typically falls between £80 and £250, and you can see why repair makes so much sense. A lock change or realignment might extend the life of your door by several years without the upheaval and expense of replacing the whole thing.
How to Spot Problems Early
One of the best ways to save money is to deal with issues early. Here are a few signs that your composite door might need attention:
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The key feels stiff or catches when turning
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The handle feels loose or requires force to lift
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The door rubs against the frame when closing
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Draughts are noticeable around the edges
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Condensation appears inside the glass panel
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You can hear rattling when the wind blows
If you notice any of these, calling out a specialist like Repair UPVC sooner rather than later can prevent further damage and higher costs down the line.
Preventative Maintenance Tips
Composite doors are relatively low maintenance, but a little care goes a long way. From my years of experience repairing doors across homes in the UK, here are the tips I recommend to every customer:
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Clean the door with warm soapy water and a soft cloth every few months to keep the surface free of grime
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Avoid abrasive cleaners which can scratch the GRP skin
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Lubricate the hinges and locking points twice a year with a silicone spray
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Check and replace seals if you notice gaps or draughts
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Do not force the handle if it feels stiff – this is the number one cause of snapped handles
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Arrange a professional security check every couple of years to make sure locks are still up to standard
Why Home Security Matters
The Office for National Statistics reports that in England and Wales, around 250,000 burglaries were recorded in 2023. Forced entry through doors remains one of the most common methods. A composite door in good condition with a properly working multi-point lock and an anti-snap cylinder is one of the best defences you can have. Ensuring your door is functioning correctly is not just about convenience – it is about protecting your home and family.
How Repair UPVC Can Help
At Repair UPVC we take pride in offering a complete repair service for composite doors across the region. Whether it is a simple hinge adjustment or a full lock replacement, our goal is always to fix rather than replace wherever possible. We know that homeowners value cost-effective solutions, and we bring years of experience, the right parts, and a professional but friendly approach to every job. We also offer emergency locksmith services if you are locked out or if your door has been damaged in a break-in.
When You’re Ready to Call the Experts
Composite door repairs can be straightforward when handled by professionals. If you have been struggling with a sticking lock, a dropped door, or misted glass, do not put it off any longer. Small issues can quickly turn into big ones, and the longer you leave them the more expensive the fix becomes. At Repair UPVC we specialise in these kinds of repairs every single day, and we are always happy to give honest advice on whether a repair or replacement is the best option.
If you need help with your composite door, get in touch with us today. We will restore your door’s security, efficiency, and appearance quickly and professionally. Call now or fill in our simple contact form to request a free, no-obligation quote.
Need a professional to fix your composite door? Contact Repair UPVC today for expert repairs that save you money and keep your home secure.