Ed Miliband is expected to point out that 3.6 million households - including one million with children - are now privately-rented accomodation.
"We cannot have two nations divided between those who own their own homes and those who rent", the Labour leader will say.
"There are too many rogue landlords and agencies either providing accommodation which is unfit or ripping off their tenants", he is set to add.
More top news
Spring takes a hike - for the time being
A number of Britons are feared stranded on Mount Everest after the Nepal earthquake triggered a deadly avalanche on Saturday.
Prime Minister defends royals' decision to give birth in a private hospital - instead of going with the NHS