Keep your tenancy agreement, rent and deposit payment records, and any inventory or condition report. Save emails, texts and letters with your landlord or agent, especially about repairs, rent increases, notice periods or permission for changes. Dated photographs or videos can help record the property’s condition, while copies of notices, inspection records and repair receipts may also be relevant. Organise everything by date and keep backups; the RTB or a solicitor will assess the evidence and individual circumstances if a dispute arises.