Landlord Chris Prosser must pay £2,000 in fines and costs for failing to licence a shared house in multiple occupation.
Prosser was found guilty of the offence by magistrates in Wrexham.
His conviction was the fifth against landlords in the Welsh town since December 2012.
Councillor Mark Pritchard, lead member for Housing and Planning, said: “I am pleased that this prosecution has been successful.
“Landlords have had almost two years to obtain a licence and those who have are to be commended for their commitment to maintaining and raising housing standards for our residents. We now take a zero approach to those landlords who are failing in their duty to obtain a licence and this prosecution shows we will not hesitate to bring a prosecution when necessary.
“We are determined to raise and maintain housing standards for all our residents and I would like to thank all members of staff who were involved in bringing this case to a successful conclusion.”
Fine for building flats without planning permission
Landlord Murat Alma failed to seek planning permission before building two flats on the rear of a house in Walthamstow, East London.
Waltham Forest Council ordered him to pull down the extension within six months, but he failed to comply.
Now, Thames Magistrates have fined him £4,000 and ordered him to pay £1,350 costs for ignoring the order – and he still has to demolish the extension.
“This is an ugly and monstrous extension that has no regard for neighbouring properties and is totally out of keeping with the building it is attached to,” said Deputy Council Leader Clyde Loakes.
“This shows one of the good reasons why councils have planning powers to protect abuses of the neighbourhood that show no consideration for anyone else. That’s why we have to keep hold of these powers and people have to apply for permission before building.”