THE stench that assaults your nostrils as you open the door takes your breath away.

What were once polished wooden floors have been worn bare and are littered with mice faeces, discarded jars and random objects.

Power points hang precariously on wires where they have been ripped off the wall and every wall has had amateur wooden shelving, or bed frames nailed to it.

Peter Constantinou was left speechless when he inspected his once quaint Caloundra one-bedroom cottage after finally managing to evict the "tenants from hell".

Mr Constantinou estimated it would cost more than $50,000 to repair the extensive damage caused by the family of five who had lived in the First Ave house for the past four years.

Several people applied for the house when it was put up for private rent, but Mr Constantinou decided to give the man and his wife a fair go after the man begged him to rent the property.

Once the keys were handed over in a "handshake agreement", the couple arrived with a six-year-old girl and later two adult children and two large dogs also moved in.

Based in Brisbane, Mr Constantinou said he had been ill and as a result, had not kept a close eye on rent payments or visited the property to undertake inspections and the tenants had "taken advantage".

"They did not pay rent for two years and whenever I confronted them about it, they had every excuse under the sun," he said.

With the family finally leaving two weeks ago, Mr Constantinou was left with rubbish that had been piled up in, under and around the house.

Rubbing salt into the wounds, the granite kitchen bench top, gas cook top and wall mounted oven had all been stolen and he discovered a crudely constructed room under the house which had been littered with drug paraphernalia.

Determined not to be crushed by this, Mr Constantinou will spend the next few weeks rebuilding the house he has owned since the mid-1980's and landscaping the property with the aim to attract more desirable tenants in the future.

He is yet to find out if insurance will cover the damage and urged landlords to "go by the book."

"I have no one to blame but myself. I don't want to see this happen to anyone else."