Business · 4 min read · Updated 6 November 2026
Drylining for landlords: HMOs, flat conversions and quick turnarounds
Why drylining suits rental property
Rental refurbishments are usually done between tenancies, when every week empty costs rent. Drylining avoids the long drying times of wet plaster, so rooms can be decorated within days. It is also the standard way to build new partition walls, line damaged walls quickly and add fire or acoustic performance.
Drylining can also improve the energy performance of a rental property. Insulated plasterboard on cold solid walls can help a property's energy rating, which matters for landlords because minimum energy efficiency standards apply to most private lets. The work should be planned carefully to avoid condensation and should meet building regulations where large areas of external wall are upgraded.
HMO fire separation
Local councils set HMO standards, and most follow national fire safety guidance for housing, often referred to as the LACORS guide. In many HMOs, this means the escape route, such as the hallway and stairs, must be protected by fire-resisting construction, commonly 30 minutes, with fire doors to the bedrooms and kitchen.
- Walls and ceilings to the escape route built or upgraded to the required fire resistance
- Ceilings under bedrooms and over kitchens often upgraded
- Gaps around pipes, cables and service openings fire-stopped
- Fire doors fitted correctly, with suitable frames and self-closers where required
- Linked smoke and heat alarms to the standard the council asks for
Exact requirements depend on the size of the HMO, the number of storeys and the council's own standards, so check before work starts.
Flat conversions
Converting a house into self-contained flats is a material change of use, which needs building regulations approval and usually planning permission. Walls and floors between flats need to meet fire separation and sound insulation requirements, and sound testing is normally required for conversions in England.
| Element | What is usually involved |
|---|---|
| Floors between flats | Fire-rated ceiling below, acoustic insulation and sometimes a floating floor |
| Walls between flats | Fire-rated, acoustic stud or lining systems |
| Common stairs and halls | Protected escape route with fire-resisting walls and ceilings |
| Service penetrations | Fire-stopping and acoustic sealing |
Reducing tenant noise complaints
Noise between rooms is one of the most common sources of tenant complaints in shared houses. Acoustic plasterboard, mineral wool in stud walls, resilient bars on ceilings and sealing around sockets and pipes all make a noticeable difference. The work is cheapest when done as part of a refurbishment rather than as a later fix.
Ceilings between floors are often the worst offenders, because footsteps carry through timber joists. Adding mineral wool between the joists and a resilient bar ceiling with acoustic board below can make a clear difference, and can be done from the room below without lifting floors.
Planning a void-period refurb
- Get the council's HMO standards and any licence conditions in writing
- Agree the fire and sound specification before quotes are requested
- Book electrician and plumber first fix before boarding
- Order boards and fire doors early, as lead times vary
- Allow for building control inspections where the work needs approval
- Keep photos of fire-stopping and insulation before it is covered
Documents worth keeping
Councils, insurers and future buyers may ask for evidence of how fire-rated walls and ceilings were built. Keep the specification, board and system details, photos, building control certificates and any sound test reports together with the property records.
If the work is done in stages over several tenancies, update the records each time. A simple floor plan marking which walls and ceilings are fire-rated, and which doors are fire doors, is especially useful for fire risk assessments and for any contractor working on the property later.
Common landlord mistakes
Fire and sound upgrades in rental property are often done in a hurry, and the same problems come up again and again.
- Building partitions before checking the council's room size and licence rules
- Using standard board where fire-rated board was needed
- Leaving gaps around pipes, cables and downlights in fire-rated ceilings
- Fitting fire doors into frames that are not suitable
- Boarding over damp walls to get a property let quickly
- Skipping insulation in stud walls between bedrooms
- Losing the paperwork that proves how the work was done
Each of these can mean failing a licensing inspection, having to open up finished walls or dealing with repeated tenant complaints. Agreeing a clear specification and keeping records costs very little by comparison.
Downlights deserve a special mention. Cutting holes in a fire-rated ceiling reduces its performance unless fire-rated fittings or covers are used, so tell the electrician which ceilings need to keep their rating.
Frequently asked questions
What fire rating do HMO walls need?
In many HMOs, walls and ceilings protecting the escape route need 30 minutes fire resistance, with fire doors to the rooms that open onto it. The exact requirement depends on the property's size and layout and on the local council's standards. A common approach is 12.5 mm plasterboard on each side of a stud wall, but the full system must be correct. Fire-stopping around services matters just as much as the boards.
Do I need sound testing for a flat conversion?
In England and Wales, converting a building into flats normally needs pre-completion sound testing of the new separating walls and floors. The robust details route that can replace testing on some new homes does not generally apply to conversions. Your building control body will confirm what is needed. Building to a proven acoustic system improves the chance of passing first time.
Can I add a bedroom to an HMO by building a stud wall?
Possibly, but splitting a room affects licence conditions, minimum room sizes, fire safety, natural light and ventilation. Councils set minimum bedroom sizes for licensed HMOs, and the new room will need suitable escape provision. Check with the council's HMO team and, where needed, building control before building the wall.
landlords HMO fire safety flat conversions
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