When more than one responsible person shares a building

It's entirely normal, under the current Regulatory Reform (Fire Safety) Order 2005, for more than one responsible person to hold duties in relation to the same building at the same time — a landlord for shared structure and common parts, separate employers or occupiers for the units they control. The Order anticipates this and expects the parties involved to cooperate and coordinate. That expectation is straightforward to state and considerably harder to make work reliably in practice.

Why coordination is the hard part, not the legal principle

The legal principle — that everyone with control of part of a building is responsible for the parts they control, and needs to work with the others — is relatively easy to grasp. The practical difficulty is that different responsible persons in the same building often have no natural forum for talking to each other regularly, use different assessors, keep separate records, and only really interact when something has already gone wrong.

Where this shows up most often

Shared plant rooms, communal fire alarm systems that serve multiple demises, shared escape routes that pass through more than one party's controlled area, and party walls or compartmentation that relies on decisions made independently by neighbouring occupiers are all common flashpoints. An alteration made by one occupier — a new partition, a change of storage use — can affect fire safety in an area controlled by someone else entirely, without the affected party ever being told.

• –Agree explicitly, and ideally in writing, who covers which parts of a shared building
• –Establish a point of contact between responsible persons for anything affecting shared systems or structure
• –Flag any alteration that could affect shared escape routes, compartmentation or alarm coverage before it happens, not after
• –Share relevant fire risk assessment findings that touch shared areas, even where each party holds a separate FRA
• –Revisit the coordination arrangement whenever a party in the building changes

What good coordination actually looks like

In well-run multi-occupancy buildings, coordination tends to be lightweight but deliberate — a shared point of contact, an agreed process for flagging changes that could affect a neighbour's fire safety, and enough transparency between parties that nobody's making an assumption about what someone else has covered. It doesn't need to be a formal committee; it needs to be a habit that survives staff and tenant turnover.

Where records fit into this

Separate responsible persons will generally keep separate fire risk assessments and separate records, and that's expected. What tends to go wrong is when those separate records never get compared against each other — an action on one party's FRA that depends on something only another party controls, sitting unresolved because neither side realised the dependency existed. Visibility across shared buildings, even where responsibility is formally split, reduces how often that specific kind of gap goes unnoticed.

Exactly how cooperation duties apply to a specific shared building depends on the facts of occupation and control there — this is worth checking against the current RRFSO and, where the arrangement is complex, proper legal advice.