Most baby-boomer parents have experienced this issue at one time or another – grown children who, due to the housing shortage, cost-of-living pressures and the increasingly-casualised workforce, are still camping out in the Mum and Dad hotel.

An Australian relocatable home manufacturer says that the biggest demand for instant homes is from “Empty-Pesters” – couples who need to get their grown-up kids out of the house and into the backyard.

VanHomes Managing Director Vito Russo said more young adults aged 18-35 are staying at home longer due to soaring rental prices and housing affordability issues.

Parents want their privacy – but they also want to help their kids out, he said, which is creating a boom in the number of households putting instant homes into their backyard for the grown-up kids

“Rather than helping their kids out financially, which can be difficult for many people, parents are investing in a long-term solution that supports their grown-up kids and provides value for the parents,” Mr Russo said.

"The compromise? A backyard home that gives adult children independence while keeping them close – just not too close! Parents want their space and they want to be able to enjoy life in their own surrounds without the adult kids getting in the way," he added.

Instead of squeezing into an already full household, families are installing relocatable homes, also referred to as instant homes or granny flats, in their backyards allowing young adults to live on their own terms while saving up for their own home, still benefiting from the security of the family unit.

"Relocatable homes provide a fast, cost-effective and comfortable solution for keeping adult kids close while giving everyone some breathing room," Mr Russo said.

"With rent prices skyrocketing and homeownership out of reach for many young Australians, a backyard home offers an affordable alternative. It allows young adults to develop independence and save money which they can then put towards their own home.”

He said the homes often have the benefit of not requiring council approval and all the added costs and delays that this causes. Contact your local Council for confirmation.

"One of the biggest advantages of relocatable homes is that they can be installed without council approval in most areas of NSW and some other parts of Australia.

“This means families can quickly set up a self-contained living space without the hassle of lengthy approvals and red tape," Russo said.

Unlike a traditional granny flat or converted garage, he added, relocatable homes are full-sized, self-contained homes that come with kitchens, bathrooms and separate living areas, ensuring that grown-up kids have a fully independent lifestyle while staying within reach of family support.

"One of the best things about a relocatable home is their relocatable nature,” Mr Russo said.

“If life circumstances change, the home can be easily moved to a new property or sold on the second-hand market providing flexibility for the future," he concluded.