Prisons present the most constrained evacuation environment of any building type. This guide covers cell fire risks, locked-door evacuation procedures, and fire safety standards in UK custody.. The Custodial Fire Safety Paradox Prisons represent the ultimate conflict between fire safety and security. The fundamental principle of fire safety — that people can escape from fire — is deliberately constrained in custodial environments. This creates a fire safety environment unlike any other building type. Scale of the Challenge UK prison population exceeds 87,000 across 120+ establishments HM Inspectorate of Prisons (HMIP) reports fire safety concerns in most inspections Cell fires are the most common fire type (deliberate fire setting) Approximately 3,000 fire incidents in UK prisons annually Limited evacuation options due to security requirements Cell Fire Risks Deliberate Fire Setting Protest fires (drawing attention to grievances) Self harm (fire as self injury method) Weapon concealment (destroying evidence) Cell flooding followed by fire Attacks on other prisoners or staff Ignition Sources Authorised: lighters, matches (in some establishments) Improvised: electrical manipulation, friction methods Confiscated but prevalent: smuggled lighters, modified electrical items Fuel Sources Bedding (mattress, pillow, sheets) Personal property (clothing, books, papers) Cell furniture (where combustible) Toiletries (aerosols as accelerants) Accumulated rubbish and contraband Locked Door Evacuation The Principle Cells are designed to contain fire within the cell of origin Prisoner in the fire cell must be released Adjacent prisoners are NOT released unless fire threatens their cells Wing/landing evacuation only if fire breaches cell containment Cell Containment Requirements Cell door: FD30S (30 minute fire resistance, self closing) Cell walls: 30 minute fire resistance (typically blockwork/concrete) Cell ceiling/floor: fire resistance matching structural requirements Observation panel: fire rated glazing Service penetrations: fire stopped to match wall rating Staff Response Procedure 1. Fire alarm activates (cell smoke detector or manual call point) 2. Staff investigate (locate cell, visual assessment through observation panel) 3. Confirm fire and raise alarm to control room 4. Unlock fire cell door (with fire extinguisher ready) 5. Remove prisoner from fire cell 6. Close cell door to contain fire 7. Assess spread risk to adjacent cells 8. Fire service called and briefed 9. Decision on wider evacuation by governor/duty manager Detection and Suppression In Cell Detection Anti vandal smoke detectors (armoured, tamper resistant) Heat detectors as alternative where smoke detectors repeatedly vandalised Integration with cell call system and wing fire alarm CCTV monitoring of cell corridors for smoke In Cell Suppression Some establishments have in cell sprinkler protection Sprinkler heads designed to be anti ligature Activation limits fire development within cell Reduces reliance on rapid staff response Controversial: water damage to personal property, vandalism potential Wing Protection Corridor and landing detection Roof space detection (linear heat or aspirating) Sprinkler protection of corridors and communal areas Smoke control ventilation of enclosed landings HMIP Standards Inspection Framework HM Inspectorate of Prisons assesses fire safety under 'Safety' pathway: Fire risk assessment currency and quality Staff fire safety training records Fire drill frequency and effectiveness Equipment maintenance and testing records Evacuation procedures for mobility impaired prisoners Anti arson measures and incident response procedures Common Findings Overdue fire risk assessments Incomplete fire stopping around service penetrations Defective cell doors and observation panels Inadequate staff training on fire response Blocked escape routes and locked fire exits Missing or damaged fire detection equipment Magnus Opifex SEVEN LTD — UK's Leading Fire Safety & Fire Engineering Consultancy 🌐 magnus opifex.co.uk 📞 +44 (0) 20 3488 1926 ✉️ info@magnusopifex.co.uk Founded by Daniel Sheridan, Magnus Opifex SEVEN LTD delivers award winning fire engineering, fire risk assessments, and building safety consultancy across the United Kingdom and internationally.