Fire safety in listed buildings: escape versus fabric

Fire safety work in a listed building is a negotiation between two legal duties that point in opposite directions. The Regulatory Reform (Fire Safety) Order 2005 requires a responsible person to provide adequate means of escape and to protect it. Section 16 of the Planning (Listed Buildings and Conservation Areas) Act 1990 requires the decision maker to have special regard to the desirability of preserving the building, its setting and its features of special architectural or historic interest. Neither duty yields to the other, and the answer is almost always a fire engineered solution rather than a standard one.

The practical starting position is that prescriptive guidance, written for new buildings, is a benchmark rather than a requirement. Approved Document B is one way of showing compliance with the Building Regulations. It is not the only way, and in a historic building it is frequently the wrong way.

The competing duties

Set out the duties precisely in any submission, because officers on both sides of the argument respond to precision.

The fire safety duty sits on the responsible person and is enforced by the fire and rescue authority. It requires a suitable and sufficient risk assessment and general fire precautions, expressed as outcomes: adequate means of escape, adequate detection and warning, adequate protection of escape routes.

The heritage duty sits on the local planning authority when it determines an application for listed building consent, and the courts have read section 16 as giving considerable importance and weight to preservation. Harm to significance therefore needs justification, and the justification here is usually life safety.

Where the building is also in use as a workplace or as flats, the Building Regulations apply to the works themselves. Historic buildings are given explicit latitude in the guidance, which recognises that the special characteristics of the building may make full compliance with the standard guidance inappropriate.

Listed building consent for escape works

Assume that most of the works will need consent. Listed building consent is required for works affecting the character of the building as one of special architectural or historic interest, and that catches far more fire safety work than people expect.

Applications are made to the local planning authority, and where they involve demolition or substantial alteration to a higher graded building the national heritage body will be consulted. Build that consultation into the programme rather than discovering it at week four.

Compartmentation in historic fabric

Compartmentation is where most of the damage is done. Achieving a standard fire resisting line through a building that was never planned around one usually means new partitions, new ceilings and sealed openings, and each of those erodes the plan form that carries the significance.

Three approaches reduce the harm.

Upgrade in place. Existing lath and plaster ceilings, thick lime-plastered partitions and solid timber doors often perform considerably better than assumed, and testing or assessment by a fire engineer can demonstrate it. The starting assumption that historic construction has no fire resistance is usually wrong.

Use the existing lines. Where a building already has a thick spine wall or a stair enclosure, base the strategy on those rather than imposing a new geometry. A compartment line that follows the historic plan costs less and does less harm.

Reverse the direction. Rather than protecting the escape route by enclosing it, protect the spaces that present the risk. Enclosing a kitchen and a plant room can be less harmful than lining a historic staircase hall.

Doors, glazing and detection options

Historic doors are the single most contested element. A solid timber door of substantial thickness, properly hung in a rebated frame, can often be upgraded rather than replaced, using intumescent paint or paper, thin intumescent strips let into the frame rather than the door, and attention to the gaps and the hinges.

Where the door is a significant feature, a secondary approach is to leave it alone and add a new fire resisting door behind or in front of it, or to hold the historic door open on an electromagnetic release linked to detection so that it closes on alarm. That last option resolves a conflict on many buildings because it keeps the door, keeps it open for daily use, and gives compartmentation when it matters.

Glazing in a historic screen can sometimes be upgraded with an applied film or a secondary pane rather than replaced. Detection is best specified with radio linked devices and careful routing, because surface conduit across historic plaster does more visible damage than the detectors themselves.

Alternative approaches and fire engineering

A fire engineering approach assesses the actual risk in the actual building and designs to the outcome rather than to the prescriptive tables. It is the route that resolves most of these cases, and it produces a document that both the conservation officer and the fire authority can engage with.

Tools available include extended detection to give earlier warning and longer available escape time, suppression using misting systems that need less pipework than traditional sprinklers, management measures such as restricted occupancy or staff-led evacuation, and phased or progressive horizontal evacuation where the plan allows it.

A Fire Safety Strategy prepared on that basis is a fire engineering document, and it needs an author with the relevant competence. A drafted strategy is a starting point for that professional, not a substitute for their judgement. For relevant high-rise residential buildings there is a separate planning stage requirement in the form of a Fire Statement, though that regime bites on height rather than on heritage.

Working with the conservation officer

Go early and go with options. The conversation that works is not "we need fire doors", it is "here are three ways of achieving adequate protection to this stair, with the heritage effect of each, and here is the one we prefer and why".

Bring the fire engineer and the conservation officer into the same meeting. Much of the friction in these projects comes from each side receiving the other's position second-hand through the architect, with the reasoning stripped out.

Be honest about what the fire authority has actually said. Officers become sceptical when a fire authority requirement is invoked without a letter behind it, and consultation responses are sometimes softer than the applicant's account of them.

Documenting the justification

The submission needs to do three things, and most refused applications have done only the first.

1. Set out the significance of the affected fabric and spaces, at the level of the individual door, ceiling or partition rather than the building as a whole.
2. Set out the fire safety problem as an outcome, with the risk assessment or the fire engineering analysis behind it.
3. Set out the options considered, the heritage effect of each, and why the chosen option is the least harmful way of achieving the outcome.

That third element is what turns a refusal into a consent, and it belongs in the heritage statement rather than in a separate technical appendix nobody reads. Where fabric will be lost, offer recording to an appropriate level as a condition, and where the work is reversible, say so explicitly, because reversibility carries real weight in the heritage balance. Where the building is in a block with commercial uses below, the strategy has to cover the whole building, which raises the issues set out in fire strategy for a residential block above commercial units.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

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