HMO Conversions in London: A Developer's Guide to Compliant, Profitable Schemes

HMO conversions in London remain one of the most reliable ways for developers to lift the yield on a tired house or an underused block. Done properly, a house in multiple occupation packs more lettable rooms into the same footprint and delivers a stronger return than a single-family let. Done badly, it becomes a licensing headache and a fire-safety liability. At Berati Construction, with more than 30 years of experience delivering developer schemes across the capital, we treat every HMO conversion in London as a specialist project — one that has to satisfy planning, licensing and building control before it earns a penny.

Is Your Property Right for an HMO Conversion?

Not every building suits conversion. The strongest candidates are larger period houses, tired flats above commercial units, or mid-size blocks where the layout allows generous rooms, adequate kitchens and compliant escape routes. Our developer clients typically work on schemes of one to ten units, and an HMO sits comfortably within that range. We have delivered comparable conversion work — including our Swindon eight-flat conversion and a Tunbridge Wells scheme of nine flats with a commercial unit — so we understand how to draw value from an existing structure without compromising on quality.

Planning, Licensing and Article 4

This is where HMO conversions in London get complicated. A small HMO for up to six occupants may fall under permitted development, but many boroughs have introduced Article 4 directions that remove that right, meaning full planning permission is required. Larger HMOs almost always need consent, and mandatory licensing applies to properties let to five or more people from two or more households. We help developers navigate borough-specific rules early, because a scheme that overlooks Article 4 or licensing thresholds can stall before work even begins.

Building the Scheme to Standard

Compliant HMOs demand far more than partition walls. Fire compartmentation, interlinked alarms, fire doors, sound insulation between rooms, adequate kitchen and bathroom provision and minimum room sizes are all scrutinised. As a main contractor accredited to ConstructionLine Gold, CHAS, NHBC, Gas Safe and SSIP, we build to those standards as a matter of course, coordinating design and build so the finished scheme passes inspection first time rather than requiring costly remedial work later.

Costs and Returns

Costs vary widely with the property, its condition and the borough, so any figure should be treated as indicative until we have surveyed the site. As a rough guide, a well-specified room conversion can run into the low tens of thousands per room once fire, kitchen and bathroom works are included, though period buildings and structural changes push that higher. We always recommend a site-specific quote so developers can model returns on real numbers rather than assumptions.

If you are weighing up an HMO conversion in London, Berati Construction can take your scheme from feasibility through to handover. Explore our services and browse recent projects, then get in touch via our contact page for a site-specific quote and honest advice on making your scheme both compliant and profitable.