London mayor Sadiq Khan has promised to crack down on criminal landlords by outing them online.
The new online database will list landlords and letting agents who have been prosecuted for housing offences, allowing renters to check up on their future, or current, landlord.
The mayor will be developing the tool, set to launch in the autumn, with information from six councils: Newham, Brent, Camden, Southwark, Kingston and Sutton. Other London boroughs will join the scheme after it has been launched.
Khan has also pledged to launch a property portal on City Hall's website, which will advertise affordable homes on the rental and sales market in London.
He said: "I refuse to stand by as thousands of Londoners suffer sky-high rents and horrendous living conditions in a city they call home. I want to be clear that the vast majority of landlords treat renters well, but a minority are exploiting their tenants and it's simply unacceptable. This must stop now."
The mayor's crackdown on rogue landlords comes after a year of substantial government intervention in the rental market.
On 1 April last year, the three per cent stamp duty hike on second homes came into effect, cooling down buy to let investment in London, and across the country. The tax increase, brought in by former chancellor George Osborne, has allowed first time buyers more room in the property market. However, landlords remain fiercely opposed to the policy.
Landlords were hit again in chancellor Philip Hammond's Autumn Statement, when he banned letting agents fees for tenants. Hammond argued that landlords, not tenants, should pay the fees, and that the new rules would protect renters against rogue letting agents, a position recently defended by housing minister Gavin Barlow.