Live 24/7 Business Contract Review — $79 · delivered in 15 minutes Start Now →
02 5502 3022
← Legal Guides 14 May 2026

Unreasonable Rent Increase? Your Right to Challenge and the Letter to Send

Rent increases must be reasonable, properly notified and not too frequent. Here is the formal letter that gets the conversation back on legal footing.

letter of demand rent increase tenancy

The notice arrived: rent up by $120 a week from next month. No explanation, no comparable evidence. You’re a good tenant who pays on time and looks after the place. In every Australian state and territory, rent increases must comply with strict notice, frequency and reasonableness rules — and a properly-drafted letter of demand is often the document that triggers a renegotiation.

The rules in your state

NSW: Residential Tenancies Act 2010 — minimum 60 days’ written notice; no more than once every 12 months in a periodic agreement; can be challenged at NCAT as “excessive”. VIC: Residential Tenancies Act 1997 — 60 days, once per 12 months; VCAT review for excessive increases. QLD: Residential Tenancies and Rooming Accommodation Act 2008 — 2 months’ notice; max once per 12 months; QCAT review. WA: Residential Tenancies Act 1987 — 60 days; max once per 6 months in a periodic agreement; Magistrates Court review. SA: Residential Tenancies Act 1995 — 60 days; once per 12 months; SACAT excessive-rent review. ACT: Residential Tenancies Act 1997 — 8 weeks; presumed excessive if exceeds CPI by more than 110%; ACAT. TAS: Residential Tenancy Act 1997 — 60 days; once per 12 months; RMPAT review. NT: Residential Tenancies Act 1999 — 30 days; once per 6 months; NTCAT.

Common landlord defences and why they fail

“It’s market rate.” The landlord must produce comparable evidence; assertion is not proof. “Costs have gone up.” General cost increases don’t justify rent rises beyond what comparable properties achieve. “We can charge what we want.” False — every state has an excessive-rent jurisdiction. “If you don’t like it, leave.” Termination in retaliation for asserting tenancy rights is itself unlawful in most states.

What the document does

A Letter of Demand challenging a rent increase puts the landlord on formal notice that the increase is contested, identifies the procedural or reasonableness defects, and proposes either withdrawal of the increase or a negotiated lower amount. It also preserves your right to apply to the tribunal within the prescribed timeframe (typically 30 days from the notice).

What Claim Done delivers

For a flat $79, Claim Done drafts your Letter of Demand with the correct Act citations for your state, the procedural and reasonableness arguments, and a clear counter-proposal. Far cheaper than the $300–$500 a tenant solicitor would charge.

What happens after

A meaningful proportion of landlords either withdraw or negotiate down once they receive a properly-framed challenge — defending an excessive-rent application at tribunal is expensive and risks orders against them. If they refuse, you can apply to your state tribunal within the prescribed timeframe.

Don't Let Them Off the Hook.

You've read how it works — now have your Letter of Demand drafted, formatted and sent for a flat $79.

Start Letter of Demand — $79 →
Flat fee. No subscription. Available 24/7.