Rent must not exceed the market rent for the dwelling, and since 1 March 2026 increases are also subject to a national rent-control limit. Tenants who believe their rent is unlawfully high can refer a dispute to the RTB.

555 Determination Orders published by the RTB to date have been tagged under this dispute type — figure sourced live from the RTB's own public register.

The RTB assesses market rent by reference to comparable properties in the area. If a rent (or an increase) exceeds what is lawful, the RTB can direct the rent be reduced to the correct level and can award a refund of amounts overpaid.

This is distinct from a rent-control (formerly RPZ) rent-review dispute (see the related page below) — it applies more broadly to whether the rent itself exceeds market rate.

Think your rent is above market rate? Generate a letter challenging it with the correct legal reference.

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This page summarises RTB dispute rules and cites a live, aggregate count from the RTB's own public taxonomy of published Determination Orders. It does not reproduce any individual case, name, or determination — to review actual published RTB decisions, use the RTB's own case search. Not legal advice.

See also: Invalid Rent Increase — Full Guide · All RTB dispute types