The property, located in Bolton Gardens, Bromley, was found to be operating as a house in multiple occupation (HMO) without the required licence.
An appeal against the £27,500 penalty was struck out, and the full amount is now being recovered by Bromley Council.
Councillor Angela Page, executive councillor for public protection and enforcement, said: “Landlords face significant financial penalties if they do not comply with the licensing legislation and planning requirements for HMOs.
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“Landlords and managing agents have clear obligations, and where breaches are identified, we will not hesitate to use the enforcement powers available to us.
“This action sends a clear message that non-compliance will not be tolerated.”
Following the incident, the council has reminded landlords of their legal obligations under HMO licensing rules, which apply to properties occupied by five or more people from more than one household who share facilities like kitchens or bathrooms.
The mandatory scheme aims to ensure such properties are managed and maintained to a safe standard, offering protections for tenants.
The council also requires planning permission for all proposed HMOs under an Article 4 direction introduced in 2022.
Councillor Yvonne Bear, executive councillor for renewal, recreation and housing at Bromley Council, said: “Everyone deserves to live in safe, well-managed accommodation.
“Licensing requirements and housing standards are there to help protect tenants and ensure rented properties are properly maintained.”
