RentWise Team: Report the problem in writing, keep copies of messages and photographs, and allow a reasonable opportunity for the landlord to arrange repairs. Do not withhold rent or deduct repair costs without proper advice, as this could create a separate issue. For serious housing-standard or health-and-safety concerns, you can contact your local authority’s housing inspection section, while an RTB dispute may be available for certain tenancy problems. The RTB’s decision depends on the evidence and facts of the case, so consider speaking to a qualified solicitor or tenant-support service.