Turn attendance into a useful brief
Explain total guests, the busiest period, how long they remain and whether staff use the site outside public hours. Note existing bathrooms and separate activity zones. For work, describe overlapping crews and shifts instead of providing only a permanent employee count.
Update the brief when the programme grows
Longer opening hours or an additional group can change demand even when the venue is unchanged. Review quantities with washing, accessible options and service. Any initial proposal needs reconsideration when its assumptions change; this guide is not an automatic or universal compliance calculator.
Equipment and service details to compare
Start with the people present at one time
For events, describe simultaneous attendance, turnover, staff and the timing of breaks. For worksites, explain the largest crew, shifts and usable permanent bathrooms. A total guest list or project headcount is only a starting point. Give the rental contact the pattern of use so quantities and service can be reviewed together.
Count functions as well as cabins
Accessible facilities, washing and convenience features need their own discussion. A trailer stall and a basic cabin are not automatically equivalent for every layout or programme. Consider how people reach the facilities and whether demand is concentrated in separate parts of the property.