A 10-year workmanship guarantee and a manufacturer's product warranty are two different things, and understanding the difference matters when something goes wrong. Most roofing warranty disputes in the UK arise not because contractors are acting in bad faith, but because homeowners misunderstand what their warranty covers and inadvertently take actions that void it.
A 10-year workmanship guarantee and a manufacturer's product warranty are two different things, and understanding the difference matters when something goes wrong. Most roofing warranty disputes in the UK arise not because contractors are acting in bad faith, but because homeowners misunderstand what their warranty covers and inadvertently take actions that void it. This guide explains both types of warranty, what they cover in Cheltenham's climate, and the actions that typically void them.
Two Different Warranties — Two Different Things
Workmanship guarantee
A workmanship guarantee is a commitment from the roofing contractor that the installation has been carried out to a specified standard and that they will return to remedy any defects arising from the installation quality. All our work at Cheltenham Roofing Experts carries a 10-year written workmanship guarantee. This is our personal commitment — it covers defects caused by how the work was done, not by what happens to the roof after we leave.
Manufacturer's product warranty
Manufacturer warranties cover defects in the roofing product itself. GRP flat roofing systems carry 20-year manufacturer warranties. Concrete tile manufacturers typically offer 30-year warranties. Clay tile manufacturers often offer lifetime warranties. These warranties are the manufacturer's commitment that the product will perform as specified when correctly installed — they do not cover installation errors or consequential damage.
The key point: if the product fails due to a manufacturing defect, the manufacturer's warranty applies. If the installation was incorrect, the workmanship guarantee applies. If neither is at fault — the roof has failed due to an external event or subsequent modification — neither warranty covers it.
NFRC guidance recommends that all roofing contractors carry a minimum of £2 million public liability insurance and that homeowners verify trade body membership before engaging any contractor.
What Typically Voids a Roofing Warranty in Cheltenham
1. Work carried out by an unqualified third party
The most common cause of warranty voidance. If, after a professional installation, you have other work carried out on the roof by another contractor or handyman who damages the covering or incorrect disturbs the flashings, this voids both the workmanship guarantee and typically the manufacturer warranty. This is particularly relevant in Cheltenham where satellite dish installation, TV aerial work and solar panel installation are common — all of which involve penetrating or disturbing the roof covering.
2. Modifications without approval
Adding roof lights, skylights, dormers or any penetrations through the roof after the original installation without involving the original contractor will typically void the warranty on the affected areas. If you are planning any roof modifications in Cheltenham, contact us first — we can either carry out the work within the warranty framework or advise on how to proceed without voiding coverage.
3. Poor maintenance leading to preventable failure
In Cheltenham's climate, blocked valleys and gutters cause specific failure modes that a warranty will not cover because the failure was preventable. A flat roof that has ponded water for three years because gutters were never cleared, causing the covering to fail — this is not a warranty claim. The same covering that fails because of a manufacturing defect within its design life — that is. Annual maintenance matters for warranty protection as much as for roof longevity.
4. Storm damage claimed as a warranty defect
Storm damage is covered by buildings insurance, not by roofing warranties. The confusion arises when storm damage causes failure on a relatively new roof — homeowners sometimes assume this should be a warranty claim. It is not unless the storm damage was made significantly worse by an installation defect. A correctly installed roof that loses tiles in a named storm event is a buildings insurance claim.
Questions about your Cheltenham roof warranty? Call us — we will give you a straight answer on what is and isn't covered.
📞 Call 0124 235 2251How to Protect Your Warranty in Cheltenham
- Keep the written guarantee documentation: store it securely, ideally with your property paperwork. A guarantee with no paperwork is difficult to enforce.
- Carry out annual valley and gutter maintenance: in Cheltenham this is particularly important. Document that maintenance has been done (a receipt from a professional or a dated photograph) to demonstrate that any failure was not caused by preventable blockage.
- Contact the original contractor before allowing any third party to work on the roof: even if the original contractor is not carrying out the new work, notify them and ensure the new work is carried out in a way that does not disturb the warranted installation.
- Report defects promptly: if you identify a potential defect covered by the warranty, report it in writing to the contractor promptly. Delayed reporting of a defect that leads to consequential water damage can complicate warranty claims.
What Our 10-Year Guarantee Covers
Our written 10-year workmanship guarantee covers all defects arising from the installation: tile slip where fixing is inadequate, lead flashing failure where the lead specification or dressing was incorrect, flat roof failure where the application was defective, and ridge or hip failure where the bedding or dry ridge installation was defective. It does not cover storm damage, subsequent third-party interference, or failure caused by lack of maintenance. The guarantee is transferable if the property is sold within the 10-year period — it transfers with the roof, not the owner.
Last reviewed: August 2026 by Cheltenham Roofing Experts.