The standard guideline of 1% to 1.5% of property value per year is a reasonable starting point, but it treats every property the same. This calculator adjusts that figure for your specific property type and age, and shows what you should already have saved based on how long you've owned it.
How this calculation works
The starting point is the standard 1% to 1.5% guideline, then adjusted up or down for your specific property. Detached houses carry more external fabric to maintain, roof, walls, guttering, on every side, so they sit toward the higher end. Terraced houses share walls with neighbours, reducing exposed surface area and generally lowering costs. Flats carry a lower personal reserve since a service charge typically covers external and shared-building maintenance already. Period properties (pre-1919) generally need a further uplift, since older building methods and materials, solid walls, older roof structures, tend to need more frequent, more specialist attention.
If the amount you should have saved by now is considerably more than you actually have set aside, that's not a crisis, it's useful information: it tells you the gap you're working against before an actual repair forces the issue. See our Home Maintenance Budgeting guide for the full reasoning behind treating this as a genuine annual cost rather than an occasional surprise.
Frequently asked questions
Why does a flat get a lower reserve if service charges can be expensive too?
This calculator specifically covers your own, personal maintenance reserve for anything inside your flat and not covered by the building's service charge. The service charge itself is a separate, additional cost that isn't included here, since it varies enormously by building and isn't something this reserve is meant to replace.
What if my property doesn't fit neatly into one age band?
Choose the band that reflects the age of the original structure, then adjust your own judgement if significant parts have been rebuilt or modernised since. A period property with a full modern rewire and re-roof carries less near-term risk than one that hasn't been touched, even though both fall into the same age band here.
Should I keep this reserve separate from my emergency fund?
Yes. This reserve is for planned, expected maintenance you'll spend most years; a genuine emergency fund is a separate pot for the unplanned failures that can't wait. See our Building a Home Emergency Fund guide for the distinction in full.
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