London, UK Behind the façades of ordinary residential streets in some of the UK’s busiest cities lie dangerously overcrowded and unsanitary house-shares operating far outside legal boundaries. Rats, black mould, and crumbling walls are just some of the horrors found in these illegal accommodations often hidden in plain sight.
A months-long investigation by this publication has uncovered a disturbing trend: unscrupulous landlords cramming up to 15 tenants into spaces designed for five, often exploiting vulnerable migrants, low-income workers, and students with nowhere else to go.
In several of the properties visited, our reporters found bedrooms partitioned with cardboard, mould-infested bathrooms, and makeshift gas connections that could spark disaster at any moment. In one East London house, seven tenants shared a single working toilet. In another, children were seen sleeping in basements with no ventilation or natural light.
“These are death traps,” said housing campaigner Ella Brooks, who has been lobbying councils to crack down on rogue landlords.
“What we’re seeing is not just overcrowding, it’s human rights abuse in the heart of our cities.”
Despite regulatory frameworks such as HMO (Houses in Multiple Occupation) licensing, enforcement remains patchy. Councils cite staff shortages and legal loopholes as barriers to swift action. Meanwhile, tenants many of whom fear eviction or immigration repercussions remain silent.
Some residents say they pay as much as £600 per month for a bunk bed, often in cash, with no receipts or tenancy agreements.
Experts warn that unless authorities intensify inspections and introduce tougher penalties, the crisis will worsen.
“With the cost-of-living crisis and housing shortage, these slums are proliferating under the radar,” said Professor Mark Liddell, an urban housing expert.
Housing charities are calling for a national task force to address illegal house-sharing practices and protect the welfare of affected tenants.
For now, the misery remains behind closed doors hidden from the public eye, but in plain view of those who choose to look.