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
Report criticises ministers for lack of long term plan to recruit and retain teachers in important subjects such as physics and maths.
Emergency services rushed to the scene to douse the flames, but there were no immediate reports of casualties.
A motion to remove John Bercow from his position as Speaker of the House of Commons is struggling to find support.