The three kinds of cost
A maintenance budget mixes three things that behave completely differently, and it helps to keep them apart.
Routine work happens on a schedule. AC servicing, pest control, tank cleaning. It is predictable, it can be contracted, and it is the easiest part to budget.
Reactive work is what tenants call about. A tap dripping, a light not working, an AC not cooling. Unpredictable individually, fairly steady across a year and across several units.
Replacement is the third, and it is the one that ruins budgets. Air conditioning units reach the end of their life. So do water heaters, kitchens and paintwork.
The first two are annual costs. The third is a lump that arrives every several years, and treating it as an annual cost is exactly what a sinking fund does.
