There is no separate Louth procedure: if your landlord does not return the deposit, first write to them setting out the amount due and keep messages, photographs, receipts and the tenancy agreement. A landlord may generally seek to retain money for rent arrears, unpaid bills, damage beyond normal wear and tear, or inadequate notice, but should explain and support the deduction. If you cannot resolve matters, you can apply to the Residential Tenancies Board (RTB) for dispute resolution, usually through mediation or adjudication. The outcome depends on the evidence and facts of the individual tenancy, so consider getting advice from a solicitor or Threshold.