A reserve fund is the standing pot that funds the building's major works over decades. Too little and the next roof replacement is a balancing levy. Too much and you are over-demanding service charges year after year. A Reserve Fund Plan from a RICS surveyor sets the target properly.
Without a reserve, every major cost is a one-off demand. A £40,000 roof replacement on an 8-unit block lands as £5,000 per leaseholder in a single year. With a proper reserve, the same cost is smoothed over 20 years of contributions. The mechanism is simple; the discipline is getting the target right.
Of annual service charge expenditure is a common benchmark. A Reserve Fund Plan refines this against actual building condition and deferred works.
Of major works (roof, lifts, external redecoration, window replacement). A full cycle for most blocks is 20 to 30 years of contributions at steady state.
Between Reserve Fund Plans from a RICS surveyor. Cost £500 to £2,000 each, recoverable through the service charge.
What lives in the reserve. Contributions from annual service charges. Interest earned on the trust account (also held on trust). Proceeds from any insurance claim that replaces an asset over its useful life. What does not live there. Day-to-day repairs. Operational expenses. Money for legal disputes. The reserve is for capital items with known replacement cycles, not for contingencies.
Section 42 LTA 1987 imposes the trust over reserve money, but the lease sets what the reserve can fund (typically major works only) and whether contributions are required. LEASE-iQ extracts the reserve fund clause so you know whether you can build a fund, what you can spend it on, and any caps the lease imposes.
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Common in small self-managed blocks and older converted buildings. Every major works cost lands as a one-off demand or levy. Leaseholders are surprised each time.
What to do. Commission a Reserve Fund Plan from a RICS surveyor using the calculator below. Start annual contributions at the recommended rate in the next budget. Be transparent with leaseholders: the contributions increase their annual service charge but reduce the shock of any individual major works cost.
Annual contributions are being made but the target balance was set by habit or gut feel. The fund may be over or under the right level.
You know the works are needed (EICR C2 codes, roof leaking, lift MOT failing). The reserve does not cover the cost.
Cost scales with building size and age. Older buildings have more items to plan around.
All figures are indicative ranges based on published rates checked April–May 2026. Always compare three written quotes for your specific building. Last reviewed for accuracy on the page legal-check date shown above.
A Reserve Fund Plan is a quantity surveying exercise as much as a building surveying one. Look for a RICS member with Reserve Fund Plan experience specifically.
Specifies a Reserve Fund Plan with sensitivity analysis and BCIS-sourced cost assumptions.
The mechanics are straightforward but the trust obligation is non-negotiable.
Each annual budget includes a reserve fund contribution line. Recovery is via the normal service charge with a Section 21B summary attached. The contribution rate should follow the Reserve Fund Plan (or be set to a sensible proxy if no Plan exists).
Reserve fund money is held on trust for leaseholders in a designated account. Separate from the operating service charge account where practical. Interest earned is also held on trust. The landlord, RTM, or RMC is the trustee. Misapplication of trust money is actionable by any leaseholder.
Only for the purposes the lease specifies. When drawing down, Section 20 consultation applies if the works cost exceeds £250 per leaseholder (which most major works do). Run consultation regardless of whether the money comes from the reserve or from a fresh levy. See the Section 20 page.
The certified service charge accounts (see annual accounts) must show reserve fund movement: opening balance, contributions, spend, interest, closing balance. Leaseholders see whether the fund is building, holding, or drawing down.
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"Building Trust is built by Adam Street, a director of Hafer Road Flats Limited (16-flat SoF in Battersea). Every page reflects what we do at HRFL or wish we had been told sooner. The fee benchmarks calibrate against real building data."
Read the Hafer Road case study →BLOCK-iQ records the current balance, the Reserve Fund Plan target, and the annual contribution rate. When contributions fall behind the Plan, it flags. When a major works event draws down the fund, the Section 20 and Section 42 checks fire automatically.