Plumber & Fitter OSH: Trenches, Confined Spaces

You install things. Water, gas, drainage, central heating. And you reckon occupational health and safety (OSH) is a fairy tale for bricklayers and the working-at-height lot. Except you go into places nobody else wants to: a trench up to your waist, a manhole, a tank. And in the eyes of the law those are particularly dangerous works. When an inspection turns up, it won't ask whether you can weld. It'll ask for the paperwork. In this article I break it down step by step - what you do day to day, why it's risky and what documentation you need to hand. The FULL BudoReady package (749 zł) gives you ready-made safe work method statements (IBWR) for 6 types of particularly dangerous works - including trenches and confined spaces - so you don't have to write it from scratch at three in the morning.

The key points in brief

• Trenches and confined spaces (manholes, tanks) are particularly dangerous works - they require a safe work method statement (IBWR) and a permit.
• Trench walls must be secured (shoring or battering back). Even a shallow trench has its requirements - depth isn't the only criterion.
• You don't enter a confined space alone - atmosphere testing, standby cover and a person watching from outside are the standard, not a whim.
• Soldering and welding are fire-hazardous works - a fire extinguisher, ventilation and securing the work area.
• Paperwork: an IBWR, an occupational risk assessment (ORZ) and a written permit for particularly dangerous work. From 8 July 2026 the National Labour Inspectorate (PIP) reform kicks in - inspections will be tougher.

Why a plumber counts as "particularly dangerous works"

Let's start here, because it's the crux. "Particularly dangerous works" isn't a slogan off a poster. It's a specific category from the Regulation of the Minister of Labour and Social Policy of 26 September 1997 on general OSH provisions. And two things you do almost daily fall into it: working in trenches and working in tanks and confined spaces.

What follows from that? That for these works "doing it the way we always have" isn't enough. The employer - that's you, if you run a crew - has to establish and make available a list of such works, provide direct supervision, proper instruction and safety measures. On top of that, prepare documentation showing you thought about the risk before anyone climbed into the hole. We wrote more about when an IBWR is mandatory here: IBWR - when it's mandatory.

And one thing that has to be said plainly: missing this paperwork isn't a "minus point". It's a genuine reason to halt the works and issue a fine. And if something goes wrong - it's proof you didn't do what was your job.

Trenches - the walls don't hold themselves up

The most dangerous thing in a trench is the least visible: a wall that looks solid and then collapses in a second. A person buried up to the waist already has a problem. Buried higher up - the situation is fatal, and that's literal. That's why earthworks have their own regulations - the Regulation of the Minister of Infrastructure of 6 February 2003 on OSH during construction works.

Securing the walls: shoring or battering back

In practice you have two routes. The first is shoring - bracing the trench walls apart (formwork, sheeting, struts) so the ground doesn't cave in. The second is battering back - profiling the walls to a safe angle so the ground holds itself. Which to choose and at what angle - that depends on the type of ground, the depth, the loads next to the trench (e.g. heavy plant, a road, stored material). There's no single number for every situation, which is why the method of securing should come from the design or from the IBWR, not from "eyeballing it".

"Only down to 1.5 metres" - everyone's favourite excuse

I hear it all the time: "but it's shallow, only a metre and a half, why bother". Well, it's not that simple. A smaller depth doesn't mean "do as you please". You still have to assess the ground, the loads at the edge and whether the wall will hold itself. Sometimes, in weak, waterlogged ground, even a shallow trench has to be secured. Treat depth thresholds as a signal that you need to think - not as a green light.

Rules that save lives

• You don't go down into an unsecured trench. Full stop. Shoring or a batter first, then a person in the hole.
• Getting in and out - safely, e.g. by ladder, not down the batter or over the struts.
• You place spoil and material a safe distance from the edge, so as not to load the wall.
• Trench edges where people move about - marked and secured against falling in.
• You check the ground for buried services: cables, gas, water. Hitting a cable is a drama of its own.

Confined spaces - a manhole isn't just a hole in the ground

A sewer manhole, a tank, a chamber, a cesspit. From the outside they look innocent. Inside they can kill you before you manage to shout. The reason is brutally simple: the atmosphere. In such places oxygen can run out or gas can build up - hydrogen sulphide, methane, carbon dioxide. A person goes in, takes two breaths and loses consciousness. And a second one, who dives in to the rescue without protection, dies alongside them. That's what most of these accidents look like: there are two victims, not one.

Atmosphere testing - before you go in

Rule number one: you don't enter a confined space without checking what you'll be breathing in there. That's what a gas meter (detector) is for - it shows the oxygen level and the presence of dangerous gases. You take the reading before entry and, if necessary, during the work too. If the atmosphere is bad - you air it out, ventilate and measure again. You don't go in "just for a moment", because it's precisely that "moment" that ends the worst.

Standby cover and a person outside

You don't go down into a manhole or tank solo. The standard is:

• A standby person outside - the whole time, with visual or voice contact. Their only job is to watch their mate inside and be able to pull them out.
• A harness and safety line, ideally with a tripod and winch, so an unconscious person can be pulled out without going down after them.
• Forced ventilation, if conditions require it.
• An agreed way of raising the alarm and calling for help.

The most important rescue rule: if your mate inside has lost consciousness, you don't go down there without protection. You pull them out with the line and call the emergency services. Heroic jumping in ends with two bodies.

Soldering and welding - fire on the job

You join copper, solder, sometimes weld steel on an installation. Open flame, hot components, sparks. These are fire-hazardous works and have their own rules - especially when you're doing it in a finished building, in a cellar, in a loft, near timber, insulation or flammable materials.

What has to be on your side:

• A fire extinguisher within arm's reach, working and of the right type - not in the van two floors down.
• Securing the work area - remove or shield anything that could catch fire. A mat, a screen, taking flammable things away.
• Ventilation - smoke and fumes from flux and welding aren't healthy. In a closed room, extract them or air it out.
• Watching over the area afterwards - a hot spot can smoulder for hours. Check the place after the job before you pack up your kit.
• Cylinders of industrial gas - stored and transported properly, away from fire.

And watch out for combining the topics: welding in a manhole or a trench is two categories of risk at once - a confined space plus fire. In that case caution has to be doubled, because a spark in a bad atmosphere is a catastrophe.

PPE - what you protect yourself with day to day

Personal protective equipment (PPE) for a fitter isn't just a helmet. The set depends on the job, but in practice:

• Safety footwear with a toecap and puncture resistance - always in a trench and on site.
• Gloves matched to the task - different ones for soldering, different ones for the sharp edges of pipes.
• Eye and face protection when cutting, grinding, welding.
• A safety harness when entering a confined space and when working at height.
• Respiratory protection where there are fumes, dust or a bad atmosphere.
• A helmet, hi-vis vest, hearing protection - depending on the place.

If your work also takes you onto ladders, scaffolds, roofs - read separately about how to sort the paperwork and safety measures for working at height. For a fitter, the two often go hand in hand.

Paperwork - what you actually need to have

Now the specifics, because this is what an inspection asks about. For the works we've covered, you have three pillars of documentation:

Document	What for
IBWR - Safe Work Method Statement	Describes how to safely carry out a given particularly dangerous work (a trench, entry into a confined space): the sequence, the safety measures, the supervision, the equipment.
ORZ - Occupational Risk Assessment	Shows that you've identified the hazards at the workstation (burial, lack of oxygen, fire, a fall) and selected measures to reduce them.
Permit for particularly dangerous work	Written approval to carry out a specific job - who, where, when, what safety measures and who supervises.

On top of that come the basics: OSH training, workstation instruction, medical examinations, a record of PPE issued. That's the foundation, and without it the rest makes no sense.

And now the most important thing for a small firm: nobody requires you to write an IBWR from scratch. What's required is that it fits the job and is on site. A ready-made, tried-and-tested template that you adapt in 15 minutes is worth every zloty - because the alternative is an evening with a blank page, or no paper and a fine.

The PIP reform from 8 July 2026 - why now, not later

From 8 July 2026 the reform of the National Labour Inspectorate (PIP) comes into force. In plain terms: inspections will be more efficient and less lenient about "we'll sort the paperwork out in a minute". For a small installation firm that's a simple signal - it's worth having your documentation in order before the inspector knocks, rather than counting on slipping through.

If someone asked you right now, mid-job: "show me the IBWR for this trench and the permit for entering the manhole" - do you have it, or are you rummaging through the binders? If you're rummaging, this is exactly the moment to sort it once and properly.

Sort it once - the FULL BudoReady package

That's why we made BudoReady. So that you do installations rather than poring over regulations. The FULL package (749 zł) gives you 45 files, including ready-made IBWRs for 6 types of particularly dangerous works - trenches and confined spaces included. On top of that, a risk assessment, permit templates, documents in Polish and Ukrainian (if you have a crew from across the eastern border) and versions for working with developers.

Everything editable - you enter your own details, print it, have it on site. Instead of an evening with a blank page - a quarter of an hour to adapt it. The promotion runs until 7 July 2026, right up against the PIP reform. See exactly what's inside: See BudoReady packages.

This article is for information purposes and does not replace advice from an OSH specialist or an analysis of the current legal position. Document templates require individual adaptation to the realities of your firm and specific workstations, and it's worth verifying the current legal position as at the date you use them.