'Guaranteed' gets used loosely in the building trade to cover several genuinely different things — a contractor's own promise about their workmanship, a manufacturer's warranty on a product they made, and sometimes an insurance-backed guarantee sold alongside either. Knowing which one applies to which part of a job matters if you ever need to use it.
Aftercare, in practice, is less about the promise itself and more about whether the paperwork behind it was kept and whether a defect gets reported in a way that actually triggers it.
Workmanship guarantees, in plain terms
A workmanship guarantee is the contractor's own commitment that their labour and installation will hold up for a stated period, and that they'll return to fix a genuine failure of that work within it. It doesn't cover a product that fails through no fault of the installation, and it doesn't usually cover wear and tear or misuse.
The length and scope of a workmanship guarantee vary between contractors and between types of work, so it's worth having it stated clearly in writing rather than referred to vaguely as 'we guarantee our work'.
Product warranties, separately
A boiler, a window unit, a roof covering or an appliance usually carries its own manufacturer's warranty, entirely separate from the contractor's workmanship guarantee. This covers defects in the product itself, and it typically requires registration — sometimes within a specific window after installation — to be valid.
It's a common and costly assumption that a product warranty automatically covers installation faults, or that a workmanship guarantee automatically covers a faulty product. Neither is generally true, and knowing which applies to a specific failure saves time when something does go wrong.
Registration and paperwork
None of this is complicated, but it does need doing at the time — warranty registration deadlines that pass unnoticed, and paperwork that gets lost in the weeks after a job finishes, are the two most common reasons a guarantee turns out to be unusable when it's actually needed.
- Registering product warranties within any required timeframe
- Keeping certificates, manuals and warranty documents together with the wider project file
- Recording the workmanship guarantee terms in writing, not relying on memory
Reporting a defect properly
When something does go wrong within a guarantee or warranty period, reporting it in writing — email is fine — with a description and photographs creates a clear record of when the issue was raised and what was said in response. A phone call with no follow-up leaves nothing to point back to later.
Keep a simple record of the date reported, who you spoke to or emailed, and what was agreed, even if the issue gets resolved quickly. This habit costs nothing and protects you if the same problem recurs.
What aftercare looks like in practice
Good aftercare is less about a grand gesture and more about a contractor who responds promptly to a written report, distinguishes fairly between a workmanship issue and a product fault, and doesn't need chasing repeatedly to arrange a visit. This is hard to judge before the event, which is why the paperwork and clear reporting habits matter — they're what make good aftercare possible even from a contractor you haven't worked with before.
Common questions
What's the difference between a guarantee and a warranty in practice?+
A guarantee generally refers to the contractor's promise about their own workmanship. A warranty usually refers to a manufacturer's cover on a specific product. Each covers a different kind of failure, and it's worth knowing which applies before assuming either covers everything.
Do I need to register a product warranty myself?+
Often yes, and sometimes within a limited window after installation, so check this at the time of fitting rather than assuming it happens automatically. Missing a registration deadline can invalidate the warranty entirely.
How should I report a defect during the guarantee period?+
In writing, with a description and photographs, rather than a phone call alone. This creates a clear record of when the issue was raised, which matters if it needs following up later.
Ask us what's covered and for how long before you sign
We set out workmanship guarantees and product warranties clearly in writing, with registration handled at the time.