A demand missing any of the legal elements is not just untidy. It is unenforceable. Leaseholders can lawfully withhold payment. The fix is a one-time template update that includes all four: landlord name and address, the amount and basis, the Section 21B summary, and service within 18 months of costs.
Most managing agents include some of these. Many include all four. A surprising number include only two or three. The fix is checking, then standardising. Once your template has all four, every demand from then on is enforceable.
The legal elements are free to add. The Section 21B summary is statutory text you can copy. The other three (landlord info, demand basis, 18-month timing) are management discipline, not money.
To audit your current demand template against the four elements, fix any gaps, and save the new template. Or write the agent a one-page brief and confirm the next demand is compliant.
Every quarterly, half-yearly, annual, or one-off demand. The four elements travel with the demand every time it is issued.
The four elements in detail. (1) Landlord name and address for service of notices, in England or Wales (Section 47 LTA 1987). (2) The amount, period, and basis for the demand, clear enough that a leaseholder could check the calculation against their lease share and the budget. (3) The Section 21B summary of rights and obligations, in the prescribed form (see the dedicated Section 21B page for the full text). (4) Served within 18 months of the costs being incurred, or with a written notification under Section 20B that costs have been incurred and will be demanded later.
Plus the demand frequency (quarterly, half-yearly), the leaseholder share percentage per flat, the bank account details for service charges, and the address for notices. LEASE-iQ extracts all of these in 30 seconds so you can populate a compliant demand template without manual lease reading.
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The most common starting point. Self-managed blocks often omit the landlord name and address line. Agency-managed blocks sometimes omit the Section 21B summary. The 18-month rule is missed when historic costs surface during an accounts process.
The cost was incurred (typically a major works project or an unexpected repair) but was not demanded within 18 months. Under Section 20B, that cost is no longer recoverable through the service charge unless a Section 20B notice was served at the time.
A leaseholder has read up on Section 21B or Section 47 and pointed out a defect. They are within their rights to withhold until corrected. Do not treat them as adversarial; the fix is straightforward.
Replace the amber slots with your numbers. Append the Section 21B summary on the second page (the wording is on its own dedicated page; copy it from there). This template assembles all four legal elements.
The most overlooked rule in service charges. It is not about when you bill leaseholders. It is about how soon after a cost is incurred you can recover it.
If costs were incurred more than 18 months before a service charge demand is served, those costs cannot be recovered through that demand. The clock starts when the cost was incurred (typically the contractor's invoice date), not when you discovered it.
The 18-month bar does not apply if, within 18 months of the cost being incurred, the leaseholder was notified in writing that the cost had been incurred and would be demanded later. The notification must specify (or at least indicate) the cost involved.
For any major cost where the demand will be delayed (typically major works that span a financial year), send a written Section 20B notice to every leaseholder within 18 months of the invoice date. The notice should identify the works, give an indicative cost, and state that a service charge demand will follow. Keep proof of postage. This preserves your right to demand later without losing the cost to the 18-month bar.
Major works invoiced in March. Year-end accounts produced in November. Demand for the leaseholder's share issued December. That is 9 months, safe. But: works invoiced March 2024. Year-end accounts delayed to October 2025. Demand issued December 2025. That is 21 months, not recoverable unless a Section 20B notice was served. Watch the clock from the invoice date, not the accounts date.
The consequences are civil and reversible. Unlike Section 20, where you can lose recovery permanently above £250 per leaseholder, defects in the demand itself are usually fixable by reissue.
The leaseholder can lawfully withhold payment until the defect is corrected. The underlying liability remains: a service charge that is properly payable under the lease does not vanish because the demand was defective. But interest, late-payment penalties, and forfeiture rights do not run until a compliant demand is served.
Identify what was missing. Reissue the demand with the missing element corrected. The reissue date is the new demand date for all purposes. Most defects can be cured this way.
If the defect was that the cost was incurred more than 18 months before the demand AND no Section 20B notice was served, reissuing does not help. The cost is permanently barred from the service charge. The company has to absorb it.
Either party can apply to the First-tier Tribunal (Property Chamber) for a determination on whether the service charge is payable. Free advice on the process is available from the Leasehold Advisory Service (LEASE). See the tribunal page for what to expect.
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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 produces every service charge demand with landlord info, the basis, the Section 21B summary, and timing checks built in. The 18-month clock is monitored against every cost incurred, and Section 20B notices fire automatically where needed.
If your demand is missing the Section 21B summary of rights, the freeholder's name and address, or another required element, you have a statutory right to withhold payment until a compliant demand is served. Send this letter to put the position on the record.