Which fifteen minute jobs have actually saved you an expensive repair?

The single highest-return category, and the one almost nobody touches: filters and drains on appliances.

The washing machine filter. Bottom front, behind a small hatch. Coins, hair, a surprising amount of sludge. A blocked one makes the machine fail to drain, which reads as a broken pump and frequently is not. Every few months, five minutes, and have a towel ready.

The tumble dryer. The lint screen every load, and the condenser or heat exchanger every month or so. A clogged one makes the dryer take twice as long, which costs money continuously, and on vented dryers is a genuine fire risk.

The dishwasher filter. In the base, twists out. If your dishes are coming out gritty this is why, and people replace the machine over it.

The extractor hood filter. Degreases in a dishwasher or hot soapy water. A saturated one is why your hood does nothing.

The fridge condenser coils, at the back or underneath. Dusty coils make the compressor work harder and shorten its life. Twice a year with a brush.

That list is maybe forty minutes a quarter and it is the difference between appliances that last a decade and appliances that get replaced at year five.

The building ones, where the prevented repairs are the expensive ones.

Clear the gutters and check the downpipes, twice a year, autumn and spring. Overflowing gutters put water down the wall, and that becomes damp, then plaster, then in the worst case the wall itself. This is the highest-value item on any home maintenance list and it is an hour.

Check the sealant around the bath and shower. Any gap, any lifting, any black. Water getting behind that goes into the floor and you find out about it via the ceiling below. Re-sealing is an afternoon; a ceiling is not.

Bleed the radiators and check the boiler pressure at the start of the heating season. Cheap, and it catches a slow leak before it is a cold house in January.

Clear the drain gullies outside where they take water from a downpipe. A blocked one backs up against the wall.

Check the loft after heavy weather, once a year, with a torch. You are looking for daylight and for damp on the timbers. A slipped tile found now is a tile; found in a year it is a rafter.

Each is fifteen minutes to an hour. Between them they prevent nearly every expensive water-related repair, which is most of what goes wrong in a house.

The thing that makes any of this happen, since the jobs are not the hard part: put them in a calendar with a date, not on a list.

A list of maintenance tasks is a document you read once. A recurring calendar entry saying clear the gutters, with a date attached, actually produces the behaviour.

What works for me:

Twice a year, two seasonal sessions. One in autumn before the weather, one in spring. Batch everything into those two afternoons rather than having twelve separate reminders you will start ignoring.

One monthly fifteen minutes for the filters.

A note of what you did and when, in the same place. This is more useful than it sounds - it tells you what is overdue, and it is genuinely valuable when you sell.

And two more for the vehicle list, since they are the same shape:

Check tyre pressures monthly. Under-inflated tyres wear out faster, use more fuel and handle worse. Five minutes.

Look at the coolant and oil levels on the same schedule. An engine that runs low on oil is the most expensive avoidable failure most people will ever have, and the check is thirty seconds.

Five things, two afternoons a year and a quarter of an hour a month. That is the whole list worth having.