Is your building's service charge reserve (sinking) fund on track, or heading for a special levy? A quick, informal indicator — free, instant, no sign-up.
This is an informal indicator based on a commonly used rule of thumb (roughly 10–25% of service charge going to reserves, scaling with building age), not a formal reserve study. The only way to know your building's real target is a proper planned maintenance schedule from your managing agent or a RICS-qualified surveyor. See our Freehold Residents Management Company guide for what to do if the numbers look concerning.
There's no statutory formula for how much a reserve fund should hold — unlike lease extension premiums, this isn't governed by RICS case law. Instead, this tool applies a widely used planning rule of thumb among UK managing agents: reserve contributions should generally represent somewhere around 10–25% of the total annual service charge, with older buildings, those with lifts, communal heating, or cladding sitting toward the higher end of that range, since they're more likely to face large, lumpy costs sooner. If you provided a known upcoming major-works estimate (from a recent quote or building survey), we also show what percentage of that specific figure your current balance would cover — a more concrete check than the general rule of thumb alone.
An underfunded reserve doesn't cause a problem until a major cost actually arrives — at which point leaseholders are typically hit with a one-off special levy, sometimes running into thousands of pounds per flat with little warning, rather than the cost being spread predictably over years. If your check above comes back weak, the practical next step is asking your freeholder or managing agent for the building's planned maintenance schedule — a properly run building should be able to show you what's coming and when, not just the current balance.
If you're on the board of a residents management company and these numbers look concerning, see our Freehold Residents Management Company guide for director duties and how to fix a struggling fund. If you own a share of the freehold specifically, our Share of Freehold Problems & Disputes guide covers reserve fund disagreements between shareholders. For the service charge side generally, see UK Service Charges Explained.
There's no single legal figure — it depends entirely on the building's age, size, and what major works (roof, lift, render, cladding) are realistically due. A commonly used rule of thumb among UK managing agents is that roughly 10-25% of the total service charge should go toward reserves each year, with older buildings and those with lifts or cladding sitting toward the higher end. The only way to know your building's actual number is a proper reserve study or planned maintenance schedule.
If a major cost arises and the reserve fund can't cover it, leaseholders are typically hit with a one-off special levy — sometimes running into thousands of pounds per flat with little warning. A healthy reserve fund exists specifically to spread these costs predictably over years instead.
Generally yes for financial resilience, but an excessively high reserve with no clear plan for the money can itself be a red flag — it may mean leaseholders are being overcharged, or that the freeholder/managing agent isn't transparent about what the funds are actually earmarked for. Ask for the planned maintenance schedule behind the number.