Fire Safety for Barn Conversion Holiday Lets

A guest who dies or is seriously injured in a fire at a converted barn holiday let can end up the subject of a police and fire service joint investigation, and the host can face prosecution under the Regulatory Reform (Fire Safety) Order 2005 (RRO 2005), even where the property looks charming, characterful and nothing like a fire risk. Old timber, exposed beams, thick stone walls and a single staircase are exactly the combination that turns a small kitchen fire into a fatal one, because the building was never designed to contain fire or get people out quickly.

Converting a barn, byre or stable into a holiday let is treated in law as a material change of use, which means the fire safety standard expected of it is the same as a new-build home, not a discount version because the walls are three feet of stone. Here is what that means in practice and where barn conversions specifically go wrong.

Why a barn conversion carries more fire risk than it looks

The character features that sell a barn conversion (open-plan living spanning the full height of the building, a mezzanine bedroom reached by an open staircase, exposed timber trusses) are the same features that let fire and smoke travel unchecked. A fire starting in a ground-floor kitchen in an open-plan barn can fill the entire volume with smoke in minutes, with no compartment wall or door to slow it, and no protected corridor to escape through.

Many barns were also insulated and re-clad using dense foam or timber cladding during conversion, which can burn readily and, in some materials, release toxic smoke faster than the plasterboard and brick of a conventional house. Combine that with a single mezzanine staircase as the only means of escape from an upper sleeping area, and you have a layout that would never pass building control today as a straightforward means of escape, unless it was specifically designed around it.

What the law actually requires

Converting an agricultural building into residential or holiday accommodation is a material change of use under the Building Regulations, so the same fire safety standards apply as they would to any new dwelling: adequate means of escape, fire-resisting compartmentation between floors and rooms, and fire detection appropriate to the layout. This is assessed and signed off through building control at the point of conversion, and it is worth checking your barn actually went through that process rather than being converted informally years ago and let out since.

Once the barn is trading as a holiday let, the RRO 2005 takes over as the ongoing duty. As the person with control of the premises, you are the "responsible person" and must carry out and record a written fire risk assessment, a duty that has applied to every responsible person without exception since the five-employee exemption was removed by section 156 of the Building Safety Act 2022, in force from 1 October 2023. The relevant official guidance for self-catering accommodation is the "Fire Safety Risk Assessment: Sleeping Accommodation" guide, alongside the shorter "Making Your Small Paying Guest Accommodation Safe from Fire" guide aimed specifically at bed and breakfasts, guest houses and self-catering hosts.

The specific things a barn conversion assessment needs to cover

Open-plan volume is the first thing to address. If your barn has a double or triple-height living space, the assessment needs to look at whether smoke and heat detection will actually respond in time given the extra volume the smoke has to fill before it reaches a detector, and whether heat detectors are more appropriate than smoke detectors in a working kitchen area open to that space.

Mezzanine escape is the second. A bedroom reached only by an open staircase from the main living area, with no door separating it, generally cannot rely on that staircase as a protected escape route once a fire is below it. You need either a genuinely alternative escape route (an external stair, a fire escape window at ground level reachable from the mezzanine) or full smoke detection early enough to give guests time to get down before smoke logs the stairwell, similar to the reasoning applied to escape routes and travel distances in any holiday let.

Original structure and thatch, where present, is the third. Some barn conversions retain thatched or reed roofing, or exposed timber roof trusses left deliberately visible as a feature. Thatch carries a materially higher fire spread risk than modern roofing, and where it is present your assessment and insurance both need to reflect that specifically, rather than being treated the same as a standard tiled roof.

Isolation is the fourth and most often missed. Many barn conversions sit down a farm track, some distance from a made-up road, with patchy mobile signal. Response times for the fire and rescue service will be longer than in a town centre, and your assessment should factor that into how much reliance you place on alarms alone versus early self-evacuation, plus how clearly the property is signed and located for a 999 call.

Alarms, detection and extinguishing provision

A domestic smoke alarm regime is rarely adequate on its own in an open-plan barn. Interlinked detection to BS 5839-6, covering the full open volume and each sleeping area separately, with heat detection in the kitchen, is the realistic minimum, matched by a fire blanket in the kitchen and at least one suitable extinguisher in line with BS 5306, positioned somewhere guests can actually find and reach it in the dark.

Carbon monoxide alarms matter more in barn conversions than average, because wood burners and multi-fuel stoves are a common feature, in keeping with the exposed-beam aesthetic. Every room containing a solid fuel appliance needs a CO alarm to BS EN 50291, a rule already well covered for wood burners and open fires in holiday lets generally but worth repeating because barn conversions have a higher-than-average rate of multi-fuel stoves fitted purely for character.

Insurance and booking platform exposure

Specialist holiday let insurers increasingly ask direct questions about conversion type, roof material and escape route design at renewal, and a claim following a fire can be reduced or refused if the fire risk assessment on file does not match what was actually declared. Booking platforms are also tightening requirements around safety documentation for larger or more unusual properties, and a barn conversion sleeping eight or more guests is exactly the profile that draws scrutiny after any incident.

Who is actually the responsible person

On a barn conversion this is less obvious than it sounds. If you have converted a redundant farm building on your own land and let it out yourself, you are the responsible person under the RRO 2005, full stop. But barn conversions are frequently let through a managing agent, or sit within a wider farm diversification business with a mix of owners and tenants, and the written fire risk assessment needs to name who actually holds that duty rather than leaving it assumed between an owner and an agent.

Where a farmhouse and one or more converted barns are let separately but share an access track, a yard or a shared fire point, the assessment for each barn should also note the others nearby, because an evacuation plan that only considers one building in isolation can miss a shared escape route being blocked by a fire in the building next door.

Next steps

Do not assume a converted barn is safe simply because it passed building control when it was converted, because the RRO 2005 duty to assess and record fire risk in writing runs continuously, not just at the point of conversion. Get the open-plan layout, mezzanine escape route, roof material and appliance detection specifically assessed, not folded into a generic self-catering checklist that was not written with barn conversions in mind.

FRASafe's holiday let fire risk assessment walks you through every area required by HMSO guidance, completed online in 30 to 45 minutes for £45.