An unfair tenancy clause may be one that removes or restricts rights protected by the Residential Tenancies Acts or other law. Examples could include requiring the tenant to pay for the landlord’s legal repair duties, allowing unrestricted entry without proper notice, automatically forfeiting the deposit, or imposing unreasonable charges or penalties. A tenancy agreement cannot override statutory protections simply because the tenant signed it, although whether a particular term is invalid depends on the wording and the tenancy’s circumstances. The RTB may decide disputes about the term, and you can seek advice from Threshold or a solicitor.