The short answer
Get a diagnosis and a quote before deciding. As a rough rule, repairing is worth it if the cost is under half the replacement price and the item is less than halfway through its expected life.
- Find out what is actually wrong before assuming. Many appliance faults are a single inexpensive part.
- Get a quote, and ask what the part is. Pumps, belts, seals, elements and thermostats are usually cheap.
- Compare against the real replacement cost, including delivery, installation and disposal.
- Consider the running cost of the new one where it is an old fridge or freezer, which can shift the sums.
- Check the warranty and your consumer rights first. Goods have to be of satisfactory quality and durable, and that right can extend well beyond a manufacturer's warranty.
What will ruin it
Do not repair gas appliances or anything mains electrical yourself beyond the obvious. The saving is not worth the risk, and uncertified work causes problems when you sell or claim.
Why it works
Most appliances fail on one consumable component rather than wearing out as a whole. The labour is usually more than the part, which is what makes a competent local repairer better value than a manufacturer callout.
Tipking is general household information, not professional advice. Test anything on a hidden patch first. Full disclaimer.
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