Labour has vowed to “put bad landlords out of business” and bring in rent controls in England, if it wins power.
Private rents would not be allowed to go up by more than inflation – and landlords would be fined for letting out substandard property.
A Labour government would also bring in “open-ended” tenancies, to protect tenants from unfair evictions.
The Tories have also set out plans to help tenants – including scrapping “no fault” evictions.
Under Labour’s “private renters’ charter”, landlords would face an annual “property MOT”, with fines of up to £100,000 or forced repayment of rent if their properties are found to be sub-standard.