# Hot Work Permit Trigger Matrix

Use this matrix before welding, cutting, grinding, brazing, soldering, torch-on roofing or temporary heating.

Site rules may require a hot work permit even when the legal duty is framed more broadly as fire-risk control.

| Trigger | Permit Position | Minimum Checks To Record |
| --- | --- | --- |
| Open flame or torch-on work | Permit normally expected | Combustibles removed or protected, extinguishers present, fire watch agreed |
| Cutting or grinding producing sparks | Permit normally expected | Spark path checked, screens fitted, dust or flammable vapours controlled |
| Hot work in roof void, riser, plant room or service duct | Permit strongly expected | Hidden voids checked, service penetrations protected, post-work inspection |
| Work near flammable liquids, gas cylinders or combustible storage | Permit and isolation controls expected | Storage moved, cylinders secured, ignition sources controlled |
| Work in occupied premises | Permit or documented client approval expected | Occupier interface, alarms, escape routes and communication agreed |
| Temporary heaters or drying equipment | Permit or fire-risk approval may be required | Heater type, clearances, ventilation and supervision recorded |
| Hot work after normal site hours | Permit and management approval expected | Fire watch, security handover and emergency contact confirmed |

## Hot Work RAMS Prompts

- [ ] The RAMS names the hot-work activity and location.
- [ ] The sequence includes pre-work fire checks.
- [ ] The sequence includes the hot-work permit issue and close-out.
- [ ] Fire watch duration is stated.
- [ ] Extinguisher type and location are recorded.
- [ ] Combustible materials and hidden void risks are controlled.
- [ ] Emergency arrangements are specific to the work area.

## Official Sources To Check

- HSE: Construction fire safety - https://www.hse.gov.uk/construction/faq-fire.htm
- HSE: Fire safety in construction, HSG168 - https://www.hse.gov.uk/pubns/books/hsg168.htm
- Regulatory Reform (Fire Safety) Order 2005 - https://www.legislation.gov.uk/uksi/2005/1541/contents/made
- DSEAR 2002 - https://www.legislation.gov.uk/uksi/2002/2776/contents/made