Ventilation and condensation in rented homes
Most reported mould in rented homes is condensation-related, and the legal position has moved decisively away from blaming tenant behaviour. Adequate ventilation is a landlord responsibility.
4 min read · Updated 2 August 2026
Overview
Most reported mould in rented homes is condensation-related, and the legal position has moved decisively away from blaming tenant behaviour. Adequate ventilation is a landlord responsibility.
Diagnose before you treat
Distinguish penetrating damp, rising damp and condensation. Painting over mould without a diagnosis guarantees a repeat report and looks negligent later.
Practical measures
Working extract fans in kitchens and bathrooms, trickle vents in windows, insulated cold bridges, and adequate heating. Humidistat fans are inexpensive and remove most arguments.
Record what you did
Photograph the affected area, record the diagnosis, the remedy and the completion date, and follow up with the tenant a month later.
Tenant guidance
Explain how to use the ventilation you provided, in writing, but never rely on that guidance as your defence.
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This guide is general information for UK landlords and letting agents, not legal advice. Rules differ across England, Wales, Scotland and Northern Ireland — check your local requirements or take advice before acting.