What will this job put on the truck?

No. It is the arithmetic we would do on the phone, shown openly so you can see where the number comes from. The quote comes after a two-minute conversation about the ground, the access and how long it is standing.

One unit per ten workers on a standard week is the long-standing construction figure. Event sizing works off guests and hours - roughly one per hundred over four hours, tighter for a festival crowd, looser for a backyard party - with an uplift when there is a bar because people stay longer and drink more.

Because an accessible unit is not a substitute for a standard one. It is there so someone can actually use the facilities, and if it absorbs the general line it stops doing that job. One per eight is the working ratio, and at least one wherever the public can walk in.

It is the ratio that keeps a line from forming at the sink while units sit empty. Where food is being served, put in more than the ratio suggests and site them within sight of the serving line.

The peak-hour count is what sizes the order; the number of days changes the servicing, not the unit count. A three-day festival with the same gate needs the same units and considerably more service.

Call and talk it through. Sometimes it is genuinely too high because the crowd turns over rather than staying, and sometimes it is right and the alternative is a line. We would rather tell you than take the bigger order.