Keeping a Fire Alarm System Working During Cladding Remediation Works

Cladding and external wall remediation works are now a routine, if unwelcome, feature of life for many UK residential buildings, and they bring a fire alarm engineer into a situation the standard maintenance visit was not really designed around: a fully commissioned, occupied, operational life-safety system that now has scaffolding, contractors, dust and hot works happening around the building envelope it protects. The remediation project itself is not a fire alarm job, but keeping that system correctly protected and functioning throughout the works genuinely is one, and it deserves the same deliberate attention as any other change affecting an existing installation. This article sets out the practical considerations involved.

The short version: remediation works change what surrounds an already-working fire alarm system rather than the system itself, and the engineer's job is protecting its continued correct operation — checking external device coverage and physical protection, managing works-related false alarm risk properly, and maintaining active liaison with whoever is running the remediation project — rather than treating the works as background noise unrelated to the fire alarm.

Who this is for

This is an informational overview for fire alarm and security engineers maintaining systems in buildings undergoing, or about to undergo, external wall or cladding remediation works. The experience level assumed is competent engineer. It does not cover the remediation works themselves, cladding assessment or the Building Safety Act's remediation and funding schemes, which are matters for the building's principal contractor, fire engineer and the responsible person's wider remediation project team. A maintaining engineer's job throughout is protecting continuity of an already-working system, not redesigning it around the works.

What is actually different about a remediation project

A cladding remediation project is fundamentally about the building's external envelope — removing and replacing an external wall system found to present a life-safety fire risk — carried out, in the great majority of cases, while the building remains occupied. That combination is what makes it distinct from either a typical new-build fire alarm project, where there is no existing operational system to protect, or a typical internal refurbishment, where the works are largely inside the building rather than wrapped around its exterior. The formal remediation and funding process itself, including reporting an unsafe external wall system and applying for support through schemes such as the Cladding Safety Scheme, sits with the responsible person and their appointed professional team; the fire alarm engineer's role begins once works are actually happening on or around the building and the existing system needs to keep working correctly throughout.

Scaffolding, sheeting and physical protection

Full-height scaffolding, often wrapped in sheeting or debris netting for the duration of a remediation project, changes the immediate environment around a building's external fire alarm equipment in ways worth checking specifically rather than assuming away. External sounders and visual alarm devices can be partially or fully obscured by sheeting, reducing their effective audibility or visibility exactly where they might matter for a nearby external escape route or assembly point. Where any part of the system relies on external wireless devices or repeaters, dense scaffolding and metal sheeting can affect radio signal paths that were surveyed and commissioned under different physical conditions, which is worth a practical check rather than an assumption that a previously reliable link remains reliable once scaffolding goes up around it. And simply as a matter of site risk, external cabling, containment and devices are more exposed than usual to accidental damage or disconnection by remediation contractors working in close proximity, which makes a pre-works walk-round to note the condition and position of exposed external equipment, and a request that contractors take reasonable care around it, a sensible practical step.

Managing false alarms during the works

Cladding and render removal, cutting, and other remediation activities generate dust and sometimes involve genuine hot works, both familiar triggers for smoke and heat detectors that were commissioned for normal, undisturbed occupied use rather than an active construction project happening around the building. Rather than accepting repeated unwanted activations as an inevitable cost of the works, or leaving affected detection permanently disabled for the duration of a multi-month project, the better approach is agreeing and documenting a specific, time-limited disablement or investigation-delay arrangement for the detectors genuinely affected by a given activity or work area, reinstating full normal operation as soon as that phase of work moves on or finishes for the day. This needs to be a deliberate, recorded decision involving the responsible person, not an informal arrangement between whichever engineer is on site and whichever contractor happens to ask, and it should never extend to disabling detection covering areas the works are not actually affecting.

Liaison between the remediation contractor and the fire alarm maintainer

The single most useful thing that tends to be missing on projects where this goes wrong is simply communication: the remediation contractor's programme rarely mentions the fire alarm maintainer by name, and the fire alarm maintainer's routine service schedule was set up long before anyone knew remediation works would be happening. Establishing a direct point of contact between the two — so the maintainer knows in advance when hot works, dust-generating activities or scaffolding changes are planned, and the contractor knows to inform the maintainer before doing anything that could affect the system — avoids both unnecessary false alarms and, more seriously, damage to fire alarm equipment that nobody flagged in advance because nobody thought to ask. Where the responsible person has appointed a specific principal contractor for the remediation works, establishing this liaison explicitly, in writing, at the start of the project is worth the modest effort involved.

When works are extensive enough to need a different approach

Where remediation works are sufficiently extensive, prolonged or disruptive that maintaining the existing system's normal operation throughout genuinely is not practical for a sustained period, the building begins to resemble an active construction site more than an occupied building undergoing background works, and it is worth considering the same kind of temporary fire safety arrangements used on construction and refurbishment projects more generally, rather than trying to stretch the existing system's normal disablement procedures to cover a situation they were not really designed for. That is a fire risk assessment and fire strategy decision for the responsible person and their appointed competent advisers, informed by the actual scale and duration of the specific remediation project, not a default response to any works taking place.

Reinstatement checks once the works finish

The end of a remediation project deserves the same deliberate attention as its start, and is easy to overlook once the scaffolding is being struck and everyone's attention has moved on to project sign-off. Once the new external wall system and any scaffolding are removed, it is worth confirming that external sounders, visual alarm devices and any external wireless equipment are genuinely restored to their original design coverage and orientation, not left slightly displaced, re-clad over, or reinstated in a position that differs from the commissioned design because a contractor refitted them without reference to the original drawings. Treating reinstatement as a deliberate checklist item — walking the building's external elevations against the original device schedule once the works are complete, rather than assuming everything simply went back where it was — closes out the project properly rather than leaving a latent gap discovered only at the next routine service visit or, worse, not until an actual incident.

Out-of-hours and unattended working periods

Remediation contractors sometimes work evenings, weekends or extended hours to meet programme, periods when the building's normal staff presence — a concierge, a facilities manager, whoever would ordinarily notice and report something obviously wrong — may be reduced or entirely absent. This matters specifically for fire alarm continuity because an issue that would normally be spotted and reported quickly during a staffed period, such as a contractor accidentally disconnecting an external device or damaging cabling, can go unnoticed for considerably longer during unattended working. Where a project involves substantial out-of-hours or unattended working, it is worth the responsible person and the remediation contractor agreeing a specific point of contact and notification arrangement for that period, rather than assuming the same informal awareness that exists during normally staffed hours will somehow continue when nobody is actually present to notice.

Keeping the fire risk assessment aligned with a long-running project

A remediation project running for many months, sometimes longer, is itself a change to the building's circumstances that the fire risk assessment should reasonably reflect — the presence of scaffolding, altered escape route conditions where works temporarily affect an external route, and the works-related hazards discussed above are all genuinely relevant to a current fire risk assessment, not just to the remediation project's own separate method statements and risk assessments. Where a fire alarm engineer becomes aware, through routine service visits, that the building's fire risk assessment has not been reviewed since the works began despite them running for a significant period, that is worth raising with the responsible person as an observation, in the same spirit as any other fire safety concern noticed while on site, even though updating the fire risk assessment itself is not the fire alarm engineer's task to perform.

Common engineer mistakes

A frequent mistake is treating remediation works as background noise unrelated to the fire alarm system, and not proactively checking external device condition, coverage and physical protection once scaffolding goes up, on the assumption that nothing about the fire alarm itself has changed. A second is allowing informal, undocumented detector disablements to become the de facto arrangement for the duration of a long project, rather than a specific, time-limited, properly recorded decision reviewed as the works progress. A third is assuming the remediation contractor will proactively inform the fire alarm maintainer of anything relevant, when in practice establishing that communication explicitly is often left to whoever notices the gap first.

Recording the remediation period in the system's own history

Noting, in the fire alarm system's own maintenance and event records, when a remediation project started and finished, and what temporary arrangements were in place during it, gives a future engineer investigating an unrelated fault or an unusual event log pattern useful context that would otherwise be easy to lose once the scaffolding is long gone and the works are a distant memory to whoever is still working on the building.

When not to rely on this alone

When not to use this article: do not use it as guidance on cladding assessment, remediation funding schemes or Building Safety Act processes, which are separate specialist matters for the responsible person's wider project team; do not use it to justify extended or informal detector disablement without proper documentation and review; and do not treat it as a substitute for a project-specific fire risk assessment addressing the remediation works themselves.

Relevant standards

The ongoing legal duty to ensure adequate general fire precautions for the building, unchanged by the remediation works taking place around it, sits under the Regulatory Reform (Fire Safety) Order 2005. BS 5839-1 remains the code of practice governing the existing fire alarm system's design, and any temporary disablement or change to how the system operates during the works should be managed against the same disciplines BS 5839-1 expects for any other planned disablement, properly recorded and time-limited. Cladding remediation itself, including reporting an unsafe external wall system, is addressed through separate government-backed processes such as the Cladding Safety Scheme, which sit alongside rather than replace the building's ongoing fire alarm compliance obligations.

Professional disclaimer

This is an educational resource for competent fire alarm and security engineers. It does not replace BS 5839-1, the building's fire risk assessment, or specialist advice on cladding remediation and Building Safety Act processes.

Related documentation

Use this alongside the building's fire risk assessment, its existing fire alarm disablement and false-alarm management procedures, and — once agreed with the remediation contractor — a documented liaison arrangement covering planned works likely to affect the fire alarm system. Where the works are extensive enough to warrant it, review this alongside temporary and construction-site fire detection guidance rather than in isolation.