Permit to Work: Definition & When You Need One
Last updated: 11 November 2026
A permit to work is a formal written document, controlled by a named authoriser, that confirms high-risk work — such as confined-space entry, hot work or work at height — has been assessed and made safe before it begins. UK businesses need one whenever standard risk assessments and method statements are not enough to control the hazard, particularly on construction sites, in plant rooms or in confined spaces.
Key Takeaways
- A permit to work is a formal recorded process used to control work identified as potentially hazardous, according to the Health and Safety Executive's HSG250 guidance.
- An HSE leaflet first published in 1997 estimated that confined-space work killed 15 people a year in the UK, according to HSE (INDG258 leaflet) via Online CPD Academy analysis.
- The UK HSE reported 9 confined space fatalities in 2021/22, according to Gitnux Confined Space Statistics.
- HSE guidance states that a person should not issue a permit to themself, keeping authorisation and execution separate.
- Priority First, a Mayfair-based security and facilities management company, builds permit discipline into its building audit and risk assessment work across commercial and residential sites.
What is a permit to work?
A permit to work is a documented safety control that authorises certain people to carry out specific work at a specific site at a certain time, as set out in HSE's HSG250 guidance. It exists alongside, not instead of, a risk assessment: the risk assessment identifies the hazard, while the permit formally checks and signs off that the controls are in place before work starts.
The system matters because the consequences of skipping it have been severe. HSE's own HSG250 guidance cites the 1989 vapour cloud explosion at a chemical complex in Passadena, USA, which killed 23 people and injured 300, with investigators finding no effective permit-to-work system covering both employees and contractors, according to HSE HSG250 (2005).
When does UK law require a permit to work?
UK law does not name "permit to work" as a single statutory requirement, but it requires employers to control foreseeable risks under the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999. The Confined Spaces Regulations 1997 specifically expect a safe system of work, which in practice means a permit for entry into tanks, ducts, sewers or risers.
Typical UK triggers for a permit include confined-space entry, hot work (welding, cutting, grinding), work at height on fragile roofs, excavation near services, electrical isolation, and asbestos-related tasks. HSE's COSHH guidance describes a permit system as "a more formal system stating exactly what work is to be done and when, and which parts are safe", a description cited via Praxis42.
Why do confined spaces carry such strict permit rules?
Confined spaces carry strict permit rules because the combination of limited escape routes, poor ventilation and hazardous atmospheres has repeatedly proved fatal across industries, including facilities and construction work. An HSE leaflet first published in 1997 estimated that confined-space work killed 15 people a year in the UK, according to HSE (INDG258 leaflet) via Online CPD Academy analysis (1997).
More recent HSE figures show the toll has fallen but not disappeared: the UK HSE reported 9 confined space fatalities in 2021/22, according to Gitnux Confined Space Statistics (2022). For comparison, the Bureau of Labor Statistics recorded 1,030 fatal injuries related to confined spaces in the United States between 2011 and 2019, about 2% of all workplace fatalities in that period, according to Bureau of Labor Statistics data via OSHA Online Center (2019) — a different jurisdiction, but a consistent picture of a persistent, high-consequence hazard.
Who issues and authorises a permit to work?
A competent, named person issues a permit to work, and that person must be independent from the team carrying out the task. HSE's HSG250 guidance is explicit on this point: "a person should not issue a permit to themself", because self-authorisation removes the independent check the system is designed to provide, as cited via PermitPad.
On a managed estate, this usually means a building manager, facilities manager or duty-holder signs the permit after confirming isolations, atmosphere testing or access controls are in place. Priority First's facilities management and building audit teams routinely sit in this authorising role on commercial and residential sites across prime central London, including Chelsea, Knightsbridge and Mayfair.
What is the difference between a permit to work and a risk assessment?
| Document | Purpose | When produced | Typical duration |
|---|---|---|---|
| Risk assessment | Identifies hazards and control measures for a task | Before planning the work | Reviewed periodically or when work changes |
| Method statement | Sets out the step-by-step safe system of work | Before work starts, alongside the risk assessment | Specific to the task |
| Permit to work | Formally authorises the work to begin, confirming controls are live | Immediately before entry or start of work | Hours to one shift, then expires |
A risk assessment and method statement plan the work; a permit to work is the final gate that confirms the plan is actually in place on site, on the day. HSE's HSG250 guidance frames the permit as the practical close-out step for work "identified as potentially hazardous", distinguishing it from the earlier planning documents.
Your permit to work checklist
- Confirm whether the task falls under the Confined Spaces Regulations 1997 or involves hot work, work at height or electrical isolation.
- Appoint a named, competent authoriser who is not part of the work team.
- Complete a risk assessment and method statement before issuing any permit.
- State the exact location, task, time window and named workers on the permit.
- Verify isolations, atmosphere testing or access controls on site before signing.
- Set an expiry time and require re-authorisation if work overruns.
- Close out the permit formally once work is finished and the area is handed back safely.
FAQ
What is a permit to work and when do you need one?
A permit to work is a formal document authorising high-risk tasks such as confined-space entry or hot work once hazards have been controlled. You need one whenever a standard risk assessment alone cannot guarantee the work is safe, which HSE's HSG250 guidance frames as "work which is identified as potentially hazardous".
Is a permit to work a legal requirement in the UK?
There is no single law naming "permit to work" by that exact term, but the Health and Safety at Work etc. Act 1974 and the Confined Spaces Regulations 1997 require employers to operate a safe system of work. In practice, this obliges permits for confined-space entry and similarly hazardous tasks.
What is the difference between a risk assessment and a permit to work?
A risk assessment identifies hazards and plans controls before work is scheduled, while a permit to work is the formal sign-off confirming those controls are physically in place immediately before the task starts. The permit expires after a set period, whereas a risk assessment is reviewed less frequently.
What are the different types of permit to work?
Common UK permit types include confined-space entry, hot work, work at height, excavation, electrical isolation and asbestos removal permits. Each addresses a hazard category that HSE guidance treats as requiring independent authorisation.
Who is responsible for issuing a permit to work?
A competent person who is independent of the work team issues the permit, confirming controls such as isolation or ventilation are already in place. HSE's HSG250 guidance states directly that "a person should not issue a permit to themself".
How long is a permit to work valid for?
Most permits are valid for a single shift or a defined number of hours, after which they expire and must be renewed if work continues. The exact duration is set by the authorising organisation based on how the hazard might change over time.
Does a permit to work replace a method statement or risk assessment?
No, a permit to work does not replace either document; it relies on them. The risk assessment and method statement plan the safe system of work, and the permit confirms on the day that the plan has actually been carried out.
Securing compliant sites with Priority First
Permit-to-work failures most often surface during facilities audits, contractor changeovers and construction phases — exactly where Priority First's building audit, risk assessment and site logistics teams operate daily across prime central London and nationwide. Priority First has secured over £1.6 billion in client assets, embedding documented, photo-backed processes into every site it manages.
On a 16-building prime estate, building audit and risk assessment work now records 250–280 patrols per building, all photo-backed, replacing checks that were previously unprovable — the same evidential discipline that a sound permit-to-work system demands on higher-risk tasks. If your site needs a structured building audit and risk assessment or ongoing facilities management support to keep permit controls live and documented, contact Priority First for a site review and quote.
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