UK / General HSE Article
What this article explains
A plain-English guide to permit to work systems, when they are needed and how they help control higher-risk activities.
A permit to work is a formal control for work that needs extra authorisation, communication and checks before it starts. It should not be treated as a simple form. A good permit system confirms what work is allowed, where it is allowed, what hazards exist, what controls are required, who is responsible and when the work must stop or be reassessed.
Use permits for work that needs formal control
Permits are usually used for higher-risk or non-routine activities such as hot work, confined space entry, isolation, excavation, work on live systems, roof work or work that can affect other operations. The exact permit types depend on the site and industry.
- Define which activities require a permit.
- Do not use permits for everything without reason.
- Do not skip permits because the job looks quick.
Make the scope clear
The permit should describe the exact task, location, equipment, time period and limits. If the scope changes, the permit may no longer be valid. Workers should not stretch a permit to cover extra jobs or different locations.
- Write the job clearly.
- Set boundaries and time limits.
- Stop and reassess if the job changes.
Check controls before work starts
A permit should confirm that isolations, gas tests, barriers, fire watch, ventilation, access, rescue arrangements, PPE and supervision are in place where required. Signing should happen after checks, not before.
- Check the worksite jointly where required.
- Confirm isolations and test results before starting.
- Make sure workers understand the permit conditions.
Control simultaneous operations
Permit systems help prevent one job creating danger for another. Hot work near flammable storage, lifting over access routes or maintenance near live operations all need coordination.
- Check nearby work and interfaces.
- Communicate restrictions to affected teams.
- Use exclusion zones and hold points where needed.
Suspend or stop work when conditions change
Work should stop if the task changes, controls fail, alarms activate, gas test results change, the permit expires, weather creates risk or another activity affects the job. Restart should happen only after reassessment and authorisation.
- Stop when permit conditions cannot be met.
- Report the change to the permit authority or supervisor.
- Restart only after controls are confirmed.
Close the permit properly
Close-out confirms that the work is complete or safely stopped, the area is left safe, equipment is returned as required and any outstanding issues are communicated. Poor close-out can create danger for the next team.
- Remove tools, waste and temporary controls only when safe.
- Confirm plant/equipment status.
- Hand over unresolved issues clearly.
Useful terms and checks
Open the sections below for short explanations that support the article.
Authorisation
Authorisation means the right person has checked the work and allowed it to proceed under stated conditions.
Scope
Scope defines exactly what work the permit covers. Work outside the scope should not continue under that permit.
Isolation
Isolation prevents the release of energy, substances or movement that could harm people during work.
Simultaneous operations
Simultaneous operations are activities happening close enough to affect each other. They need coordination.
Close-out
Close-out confirms the job status, worksite condition and any handover information needed before normal control resumes.
Practical checklist
- Permit type selected correctly
- Task scope and location clear
- Worksite checks completed
- Controls understood by the team
- Change conditions trigger stop/review
- Close-out confirms safe handback
Common mistakes to avoid
- Treating the permit as paperwork only
- Starting before controls are in place
- Using one permit for changed work
- Ignoring nearby activities
- Poor handover at close-out
Using this information
Use this article to review your own arrangements, improve discussions with your team and check whether current controls are working in practice. It does not replace site-specific assessment, competent-person advice, legal advice, client procedure or employer-approved systems where those are required.