Start with people and time, not a generic ratio
For an Abilene project, write down the greatest number of people onsite at once, how long they stay, and which permanent facilities they can use. Include workers on overlapping shifts, event staff, and vendors. An all-day program and a brief gathering with the same attendance do not create the same use pattern. Tell the rental team about food and drink service, multiple work zones, and any time the toilets cannot be serviced.
For construction, count fixtures correctly
OSHA’s construction sanitation table lists one facility for 20 or fewer workers. For the next category, it requires one toilet seat and one urinal per 40 workers; at 200 or more, one of each per 50 workers. Round up. Sixty workers therefore produces a baseline of two seats and two urinals. A unit that contains both fixtures can contribute to both counts. Review the standard and its exceptions with the site manager; the minimum fixture count does not establish adequate servicing or cover every workplace situation.
For events, describe the busiest period
Do not use construction fixture ratios as an event formula. Send peak guests, operating hours, existing restrooms, and the layout for a recommendation. A festival may need several restroom groups to avoid long walks. One customer inquiry requested 12 toilets and three washing stations with an extra visit over two days; those figures describe that inquiry, not a recommended package for every festival.
Plan accessible units within each cluster
The U.S. Access Board guide calls for at least 5% accessible units in covered clusters. That means at least one in a group of 10, or two in a group of 30. Round each separate cluster up. Confirm the applicable requirements and exact ADA model; a larger wheelchair-accessible toilet is not automatically ADA compliant. The approach, entry, surface, and surrounding clearances also need to work.
Send a short planning brief
Provide the address, use dates, peak users, event or work hours, permanent restrooms, and access requirements. Ask for the recommended units and the cleaning plan together. Revisit the recommendation when staffing, attendance, or duration changes. Your written quote should show what is included and what an additional service visit costs.