Selective licensing is now law in Dudden Hill, Kensal Green, Kilburn, Mapesbury and Queen's Park.
The new law, which came into force on 1st June, requires all landlords and managing agents who rent out properties in these five wards to apply for a licence.
The Council estimates that there are around 5,000 properties in the five wards that will require a selective licence. The fee is £540 for a licence of up to five years.
Cllr Eleanor Southwood, Cabinet Member for Housing and Welfare Reform, said: "This is good news for everyone who rents their home. Obviously most landlords provide a decent service. Unfortunately, too many think they can take advantage of their tenants. Selective licensing is a big step in the right direction towards a properly regulated rental market - something that's long overdue across the capital."
Brent Council has won over 140 prosecution cases against rogue landlords, agents and subletters since 2016. The convictions have resulted in more than £800,000 in fines.
The extension of selective licensing comes a few months ahead of new government regulations to HMO licenses (Houses in Multiple Occupation). From October 1, any property that is rented out to five or more people who are unrelated will require a mandatory licence.
If you are a Brent landlord who lets out shared accommodation, you can apply for a licence online at www.brent.gov.uk/prslicensing
If you suspect that someone is renting out an unlicensed property in Brent, please report them anonymously at www.brent.gov.uk/reportaproperty