If you own an HMO in London, the rules that apply to your property are not the same as the rules that apply to your neighbour's, even if they live on the same street in a different borough. HMO licensing London boroughs operates as a fragmented, borough-by-borough system that catches landlords off guard more often than most would expect. Understanding exactly which obligations apply to your property, in your borough, in 2026, is not optional. The consequences of getting it wrong range from financial penalties to losing your ability to let the property at all.