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Disrepair to rent reduction: the tenant maths walkthrough under the Renters' Rights Act + Decent Homes Standard (RRA Day 9, May 2026)

Damp in the bedroom, heating off through January, mould the landlord keeps promising to look at - documented disrepair has a price tag, and under the Renters' Rights Act 2025 with the Decent Homes Standard now extended to the private rented sector, the maths are tidier than they have ever been. This walkthrough covers the two parallel routes (tribunal market-rent reduction under section 14 and a civil abatement claim under section 11), the percentage-band methodology used in practice (5-15% minor, 15-30% material, 30-50% major, 50-100% uninhabitable), three worked examples with real numbers, and the section 11 notice template that starts the clock.