Composite Door Warranty Guide
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20264 minute read
Short answer
Cornwall Composite Doors provides a 10-year written guarantee covering manufacturing defects in the door slab, frame and components. It doesn't cover accidental damage, misuse, or issues caused by neglecting basic care such as lubrication and cleaning. Keeping simple maintenance up helps ensure any genuine defect claim is straightforward.
A guarantee is only useful if you understand what it actually covers. Here's a plain-English breakdown of our 10-year written guarantee, what falls inside it, what typically doesn't, and how simple care keeps you protected.
What the 10-year guarantee covers
Our written guarantee covers manufacturing defects in the composite door slab, frame and supplied components — things like a fault in the core construction or a component failing prematurely due to how it was made, not how it was used. It's provided in writing at the point of installation so you have clear terms on file.
What's typically excluded
Like any manufacturer guarantee, it doesn't cover accidental damage, misuse, forced entry damage, or wear that results from a lack of basic care over the years. Gradual, natural characteristics such as slight UV fade on very exposed doors also generally sit outside defect cover, since they're a material property rather than a fault.
- Covered: manufacturing defects in slab, frame, components
- Not covered: accidental damage, misuse, neglect
- Not covered: natural UV fade over many years
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How maintenance supports your guarantee
Keeping up with simple care — cleaning with mild soapy water, annual hardware lubrication, and rinsing salt deposits if you're near the coast — helps demonstrate the door has been looked after, which matters if you ever need to make a claim. It also simply keeps the door working better for longer.
Making a claim
If you notice something that seems like a genuine fault rather than everyday wear, get in touch and describe what you're seeing, ideally with photos. We'll assess whether it falls under the guarantee and explain the next steps clearly, without unnecessary back and forth.
Guarantee versus servicing
It's worth separating the two: the guarantee protects against manufacturing defects, while servicing and hardware care are about keeping moving parts working smoothly day to day. A well-serviced door is less likely to develop issues that could otherwise be mistaken for a defect.
Frequently asked questions
Is the guarantee transferable if I sell my house?
Guarantee terms are set out in your written documentation provided at installation — check the specific wording there, or contact us and we can confirm the position for your particular installation and provide guidance for a new owner.
Does the guarantee cover glass units?
Glazed units supplied with your door are generally covered against manufacturing defects such as seal failure, but accidental breakage isn't included. See our glass care guide for cleaning advice that helps protect your glazing long-term.
What happens if I don't maintain the door — does that void the guarantee?
The guarantee covers manufacturing defects specifically, so basic lack of cleaning alone wouldn't usually void it. However, damage that clearly results from neglect — such as a seized lock never lubricated — would fall outside defect cover rather than being a warranty matter.
Do I need to register my guarantee?
Your guarantee is issued in writing at the time of installation, so keep this document somewhere safe. If you can't locate it, contact us with your installation details and we can help confirm your cover.
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More maintenance advice
- Do Composite Doors Fade?Colour on a composite door can change gradually with years of sun exposure, but it's a slow process and rarely uniform.
- Fixing Common Composite Door ProblemsMost composite door issues are mechanical rather than structural, and are best diagnosed and fixed by an experienced professional.
- How Often Should You Service Your Door?A little routine care once or twice a year is all a composite door needs to keep working smoothly for decades.
