Confined Space Entry Permits and Safe Systems of Work

When entry into a confined space cannot be avoided, Irish law requires it to be controlled by a safe system of work. For all but the lowest-risk situations, the centrepiece of that system is a permit-to-work. This article explains how a permit fits into safe confined space entry under Part 3 of the General Application Regulations 2007, and what a sound system looks like in practice.

Avoid entry first

Before any permit is written, the law expects a simple question to be answered honestly: can the work be done without anyone entering the space at all? Tank cleaning from outside, remote inspection cameras, and pole-mounted tools have all removed the need for entry in real workplaces. A permit is only justified once entry has been confirmed as genuinely necessary, on the back of a thorough risk assessment.

What a permit-to-work actually does

A permit-to-work is not a piece of paperwork for its own sake. It is a formal, documented check that every required precaution is in place before entry, and that nothing has been forgotten. It forces a deliberate pause between “we plan to enter” and “we are entering.”

A permit-to-work turns good intentions into verified facts. It says, in writing and signed off by a named person, that the space has been made safe and that the people going in know exactly what to expect.

A typical confined space permit records:

• the exact location and a description of the work;
• the hazards identified and the control measures required;
• the results of atmospheric testing and the ventilation in place;
• the isolation of services such as electricity, mechanical drives and inflowing liquids or gases;
• the equipment to be used, including breathing apparatus where needed;
• the names of authorised entrants and the person standing by outside;
• the emergency and rescue arrangements;
• the time the permit is valid for, and a sign-off when work is complete.

Atmospheric testing

Because the deadliest confined space hazards are invisible, the atmosphere must be tested before entry and, where conditions can change, monitored continuously during the work. Testing typically checks oxygen level, flammable gases and specific toxic gases relevant to the space. A space that tests safe at the start can deteriorate quickly once welding, cleaning or disturbance of residues begins, which is why continuous monitoring matters.

The standby person

A safe confined space entry almost always involves someone stationed outside — often called the top person or attendant. Their job is to maintain communication with the entrants, monitor conditions, control who goes in and out, and raise the alarm if anything goes wrong. Crucially, the standby person must not enter the space themselves in an emergency unless they are part of a planned, equipped rescue. That distinction saves lives.

Training and competence

None of this works without competent people. Everyone involved — entrants, attendants and the person authorising the permit — needs to understand the hazards, the equipment and their own role. Confined space training builds that shared understanding so that the permit reflects reality rather than wishful thinking.

For the bigger picture of what makes a space a confined space, see our guide to confined spaces in Ireland. And because even the best-controlled entry can still go wrong, read our companion article on confined space emergencies and rescue planning before any team goes underground or inside a vessel.