Permit to Work: What It Is, When You Need One & Free Templates
A permit to work is one of those terms that gets used loosely on site — sometimes to mean any formal paperwork, sometimes only for the most high-risk activities. The result is that permits are either over-applied to every task, creating paperwork fatigue that makes the system meaningless, or under-applied to genuinely dangerous activities where a permit is legally and practically essential.
This guide explains exactly what a permit to work is, when UK law and good practice requires one, the different types you need on a construction site, and how to implement a system that works.
What is a permit to work?
A permit to work is a formal, written document that authorises a specific person or team to carry out a specific task, in a specific location, during a specific time window. It records that the hazards have been identified, the controls are in place, and a responsible person has verified that it is safe to proceed.
The key word is authorisation. A permit to work is not just a risk assessment or a method statement — it is a live operational control. Work cannot legally begin until the permit has been issued and signed. Work must stop if the conditions described in the permit change. The permit must be formally closed out when the work is complete.
The permit to work system is a way of managing high-risk non-routine activities in a controlled, documented, accountable way — particularly where multiple parties need to coordinate, where isolation of energy sources is required, or where the consequences of something going wrong are severe.
When is a permit to work legally required?
UK legislation does not list every activity that requires a permit to work by name. Instead, the duty to have a formal safe system of work — of which a permit to work is the most rigorous form — flows from the general risk assessment duty under the Management of Health and Safety at Work Regulations 1999 and the Health and Safety at Work etc. Act 1974.
In practice, a permit to work is required or strongly advisable whenever:
- The work involves a significant risk of serious injury or death that cannot be adequately controlled through a risk assessment and method statement alone
- Multiple parties need to be coordinated before work can safely begin (e.g. isolation by one trade before work by another)
- A physical control — such as isolation, lockout, or exclusion — must be verified by a named responsible person before work starts
- The work is non-routine or the conditions change frequently
Many principal contractors require a permit to work for specific activities on their sites regardless of what legislation strictly requires. Your site induction and construction phase plan should make clear which activities require a permit on that project.
Types of permit to work on UK construction sites
Hot work permit
Required for any work involving open flames, sparks, or heat sufficient to ignite materials — including cutting, grinding, welding, brazing, and use of a blowtorch. Hot work is one of the leading causes of construction site fires, many of which occur after the work has finished when smouldering materials ignite.
A hot work permit sets out: the exact location of the work, the time window, the fire prevention measures in place, the person responsible for a fire watch during and after the work, and the sign-off that conditions are safe to proceed. The fire watch period — typically 60 minutes after work stops — is often the most important and most overlooked element.
Electrical permit to work
Required for any work on live electrical systems where dead working is not reasonably practicable, and recommended for any high-risk electrical activity including isolation, testing, and work in switchrooms or on HV systems.
The electrical permit to work documents: the system to be worked on, the isolation points and how they are secured, the competency of the persons authorised to carry out the work, and the formal handback process when the work is complete.
→ Electrical Permit to Work template
Isolation of supply permit
A specific permit for the isolation of an electrical supply before work begins. Where multiple circuits or sources need to be isolated, each should be documented separately. The isolation permit confirms: which supply has been isolated, by whom, by what means (lockout, tag, fuse removal), and that the isolation has been tested before work starts.
→ Isolation of Supply Permit template
Confined space entry permit
Required under the Confined Spaces Regulations 1997 for entry into any confined space where there is a foreseeable specified risk — including an atmosphere liable to cause unconsciousness, drowning, or fire. A confined space permit documents: the space being entered, the atmospheric testing results, the rescue arrangements, the entry and exit log, and the person who is supervising from outside.
Permit to dig
Required before any excavation where buried services may be present. A permit to dig documents: the location of the excavation, the results of service drawings review and cable/pipe detection surveys, the safe digging zone, and the controls for working near identified services.
Hitting a buried live cable or gas main is one of the most serious and most preventable incidents in UK construction. A permit to dig is the control that prevents it.
General permit to work
A flexible permit for non-routine activities that carry significant risk but do not fall neatly into one of the specialist categories above. Used for activities such as roof access, work over or near water, and maintenance tasks in hazardous areas.
→ General Permit to Work template
Limitation of access permit
Used where access to a specific area of the site must be controlled — limiting who can enter, when, and under what conditions. Particularly useful where work overhead creates a falling object risk, where hazardous substances are being used, or where a process creates a temporary exclusion zone.
→ Limitation of Access Permit template
Ladder permit to work
Required by some principal contractors for any work carried out from a ladder, reflecting the high incidence of falls from ladders on UK construction sites. Documents that the task has been assessed, the ladder is in good condition and correctly positioned, and that ladder use has been justified over a more collective solution.
→ Ladder Permit to Work template
How to implement a permit to work system that works
A permit to work system fails when it becomes a rubber-stamp exercise — permits issued without proper checks, signed without the responsible person actually visiting the work area. This creates a false sense of security and is worse than no system at all, because it generates documentation that suggests controls were in place when they were not.
An effective permit to work system has three elements:
Competent authorisation — permits must be issued by a person with the authority and knowledge to verify that the stated controls are actually in place. On a construction site, this is typically the site manager, project manager, or a nominated permit coordinator. The issuer must physically inspect the work area before signing, not issue permits from the site office.
Clear scope and time limits — every permit must state exactly what work is authorised, in what location, and for how long. Work outside the scope of the permit, or work that overruns the time limit, is not covered. Permits should be renewed if conditions change or the time window expires.
Formal close-out — when work is complete, the permit must be formally closed. The person who carried out the work signs the permit back, confirms the area is safe, and any isolations are either maintained or reinstated. The closed permit becomes part of the site record.
Common permit to work mistakes
Issuing permits for everything — not every task needs a formal permit to work. Over-applying the system devalues it. Use permits for genuinely high-risk activities; manage lower-risk tasks through risk assessments and method statements.
Generic permits — a permit that could apply to any hot work anywhere on any site is not a permit to work. It is a form. Each permit must be specific to the task, the location, and the day.
No fire watch after hot work — the most dangerous period after hot work is the hour after the work stops. Every hot work permit should specify a fire watch duration and a named person responsible for it.
Permits not retained — permits to work are site records and should be retained for the duration of the project and beyond. In the event of an incident, permits are among the first documents an HSE investigation will request.
Written by the SafetyPod team — NEBOSH-qualified H&S professionals with hands-on experience across UK construction, civil engineering, and facilities management. All content is written to current HSE guidance and CDM 2015 compliance.
Last reviewed: June 2026