Portable restrooms on a construction site: count, placement and service
A site rental is a long arrangement, and almost every problem with one traces back to a decision made before the first unit arrived.
Placement outlasts the decision
A unit placed where the work is today will be in the way when the work moves, and relocating units mid-project is a billable event on most agreements. The placement that holds up is one chosen against the site plan rather than against the current state of the site — near an access route, on ground that will stay level and reachable, and out of the path of deliveries.
Service access is the other half of it. A unit that a service vehicle cannot reach on schedule does not get serviced on schedule, and the crew notices before the office does.
The count moves with the crew, not the calendar
Site headcount changes as trades come and go, and the unit count set at mobilisation is rarely right at peak. Agreeing at the start when the count gets revisited — and what adding a unit mid-term costs — avoids the situation where the count is corrected only after it has become a problem.
What to settle in the agreement
Long bookings are priced monthly, which makes delivery a rounding error and the monthly rate and service schedule everything. The terms worth pinning down are what happens if the project overruns, what a mid-term addition costs, whether relocation is billable, and how much notice pickup requires.
Next step: How many units
Requirements for site facilities are set by regulation and by the general contractor, and they differ. This page describes the usual practice, not your obligations — confirm those with whoever runs the site.