HMO Conversion Specialists in Yorkshire

Most HMO conversions require significant changes to the existing floor plan. We design layouts that maximise the number of lettable rooms while meeting minimum room size requirements - currently 6.51m² for a single adult and 10.22m² for two adults under the Housing Act 2004. Many Yorkshire councils apply higher standards than the statutory minimum, and we design to those from the outset.

Part B of the Building Regulations is the most critical element of any HMO conversion. Every sleeping room must have a protected escape route, FD30S/FD60 fire doors on all escape routes - the S denotes the cold smoke seal required in addition to the intumescent strip - and a fire alarm system designed to the specific requirements of the property.

Fire alarm specification for HMO conversions is governed by BS 5839-6. In converted HMOs, communal areas - hallways, landings, kitchens and living rooms - require a Grade A, LD2 system: mains-powered detectors wired back to a central control panel with battery backup. Individual rooms require a supplementary Grade D1 system. Larger or higher-risk properties may require an extended Grade A installation throughout. Emergency lighting is also required in all communal areas in case of fire. Getting this wrong means failing inspection.

We then manage Building Control through to the completion certificate, which is a required document for HMO licensing and for mortgage purposes. Without it, you cannot legally let the property as an HMO regardless of the physical work completed.

En-suite bathrooms change the equation significantly. An occupant with a private en-suite is typically excluded from the communal bathroom calculation, which can allow more rooms without additional shared facilities. En-suite floor space is also excluded from the minimum bedroom size calculation, so the room itself still needs to meet the statutory minimum without counting the bathroom area. We design layouts with this in mind from the outset.

All installations meet Part F ventilation requirements, thermostatically controlled hot water supplies, and slip-resistant flooring, built to the usage levels a shared property actually generates.

Kitchen size is one of the most common reasons HMO licence applications fail or require remedial work. Unlike bedroom sizes, which have nationally mandated minimums, kitchen requirements are set by individual councils, and they vary considerably, not just in the minimum square footage but in how it is calculated and what other communal space must accompany it.

Beyond size, licensing officers check that the kitchen is properly equipped for the number of occupants: adequate hob rings, oven, fridge/freezer storage, worktop space, and cupboard space per person. A four-ring hob serving eight people is a licensing problem waiting to happen.

Kitchen requirements differ between councils. Assuming otherwise is one of the more expensive mistakes in HMO development.

HMOs place higher demands on electrical systems than single-let properties. Our qualified electricians carry out all rewire and testing work to BS 7671:2018+A2:2022 - the current 18th Edition with Amendment 2, which came into force in September 2022 and introduced a requirement that catches out a lot of cheaper contractors.

Since September 2022, HMOs are specifically named in Regulation 421.1.7 as requiring Arc Fault Detection Devices AFDDs on all single-phase socket circuits up to 32A. AFDDs detect dangerous electrical arcing before it causes a fire. They are mandatory in HMOs, care homes, and high-rise residential buildings. They are not required in standard single-let properties which is why many electricians working across both sectors either don't know about this requirement or quietly ignore it.

An HMO wired without AFDDs after September 2022 is non-compliant. A non-compliant electrical installation will fail your EICR Electrical Installation Condition Report and without a satisfactory EICR you cannot obtain or renew your HMO licence.

We also install metal consumer units as required, ensure all fire alarm wiring is on a separate circuit with appropriate protection, and provide full certification including the Electrical Installation Certificate on completion. All work is certified.

Sound insulation between HMO rooms is a grey area in Building Regulations, whether Part E applies depends on how your local Building Control officer interprets the project, and approaches vary significantly across Yorkshire councils.

What is not grey is the practical reality. Poor sound insulation between rooms is the most common cause of tenant complaints and early void periods in shared properties. We recommend installing acoustic insulation between rooms and floors as part of any conversion, and can include it as part of the full project scope if the investor wants it. It costs significantly less to install during the build than to retrofit afterwards.

We manage the full Building Control process from initial notice through to completion certificate, so your HMO is fully signed off and ready to licence.