Jobsite Crew Facility Units: What a Compliant Setup Needs
A site welfare unit gives the crew a toilet, handwashing, and somewhere warm to eat. Here's what a compliant setup needs, and how to get the sizing right.
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A site welfare unit is a facility installed on site to cover the basics a crew needs to get through a shift: somewhere to use the toilet, somewhere to wash up, and a warm spot to sit and eat. Early on a groundworks site, mains power and water are often not connected yet, so the welfare setup needs to supply its own. This guide covers what a compliant setup genuinely requires, the types of units available, and how to size and place them correctly.
Welfare unit basics, and the types available
Welfare facilities generally come in two forms. One is the towable mobile welfare unit, a trailer-style cabin towed into position that carries its own water, waste, and power on board, which fits early or remote phases where nothing has been connected yet. The other is a static cabin, a portable building delivered onto the ground and left in place, paired with a separate ablution block, meaning a unit fitted out with toilets and showers ('ablution' simply means washing). The towable option has you running from day one, while the static setup offers a settled site more room and a proper canteen, though it stays wherever it lands.
Something like the Groundhog eco towable welfare unit model fits a toilet, a wash station, a seating and eating area, and a drying space inside one towable shell, which explains why it is the go-to pick for whichever crew arrives first.
Power, water, and waste handling
This is where the two options diverge the most. A self-contained towable carries its own fresh-water tank on board, a waste tank serving the toilet and sinks, and its own power, typically a small generator, which keeps it independent of the site, though the tanks still need emptying and refilling on a schedule and the generator still needs fuel and servicing. A static cabin and ablution block, on the other hand, run off a mains or utility hookup once the site has one available, meaning a water line in, a waste connection out, and a power feed. Going with mains removes the tank-and-fuel routine entirely, but the block cannot be used until those connections actually exist.
Eco and solar options land somewhere in between. A solar-assisted welfare unit reduces how often the generator has to run, cutting both fuel use and servicing needs across a long job. The cost is a higher price up front, plus output that swings with the weather, so most eco units still keep a backup generator on hand for gray stretches. On a job running many months, the lower running cost can eventually pay back that premium; on a short job, it usually will not.
Sizing the setup to headcount and shift pattern
Two numbers should drive the sizing decision: how many people are on site simultaneously, and how much their shifts overlap. A single towable unit handles a small crew without trouble. As headcount grows, the bottleneck rarely turns out to be seating, it is usually the toilets and wash stations during break time, once everyone stops at once. A crew running back-to-back shifts wears the same facilities down faster than the same headcount spread across a single day would, so that pattern calls for more capacity or an additional unit. Where the canteen becomes the constraint, a larger static cabin offers more covered seating than a towable ever could.
How delivery and siting work
The way a unit arrives depends entirely on what kind it is. A towable unit gets towed into position behind a suitable vehicle and parked on level ground, so it can be repositioned as the site evolves. A static cabin, such as a container ablution block unit comes in on a tilt-bed, also known as a roll-off, which lowers it to ground level, though a heavier example might instead need a crane to set it down in a cramped spot. Ahead of the delivery date, we look at site access and clearance, which means the straight, obstacle-free run a truck requires, along with any gates, overhead lines, and soft patches of ground.
For office space and a toilet delivered together instead of as a separate block, a unit like the 24ft site office with an on-board toilet combines the two, which can make siting a lot simpler on a tight plot. For a fuller walkthrough of access and ground prep, see our guide on getting a property ready for a container delivery.
Buying versus renting or portable toilets
Renting fits a short job or a timeline that is still uncertain, since you pay weekly and hand the unit back afterward, though the cost builds up over a long project and you never own the asset. Buying fits a long job, a rolling program of sites, or a contractor reusing the same unit repeatedly, but that comes with owning the servicing, tank emptying, and storage in between jobs. Portable toilets alone cost the least, but they give a crew a toilet and nothing beyond that, no handwashing with warm water, no canteen, and no drying area, so on their own they rarely meet a full welfare standard.
A note on the rules involved
Requirements around welfare and sanitation shift by jurisdiction and by employer, and they change further depending on crew size, how long the site is active, and the kind of work being done. Treat the items covered here as a practical starting point, then check what your specific site needs against your local rules and your own company policy. None of this is legal or OSHA advice, only general guidance.
Send over your crew size, shift pattern, and whether utilities are connected yet, and a free, itemized quote comes back covering the right unit plus delivery, no hidden fees attached. Every unit gets inspected and graded before it goes out, and expect our reply within 1 business day. Browse the full lineup on our welfare unit and site cabin range page.
