Rental guide · Updated 2026-11-06
How Many Showers Does a Crew Need? Sizing a Shower Trailer Rental with OSHA Ratios
OSHA's shower and toilet ratios turned into stall counts, with the trailers that fit each crew size. It is written for contractors, plant managers, and camp planners who need to size shower trailers, shower-restroom combos, and restroom trailers for a remote crew before the job starts, so the stall count matches the peak shift rather than a guess made on the first morning.
Key points
- Where an OSHA standard requires showers, plan one shower for each 10 employees of each sex.
- Construction sites need one toilet for up to 20 workers, then one toilet seat and one urinal per 40.
- Size to the busiest shift hour, not the day's total headcount.
Stall count is the first number in any shower trailer quote. OSHA sets minimums for the cases where showers are required, and they make a sound planning baseline even where no rule applies.
The ratios
- General industry, where a standard requires showers: “One shower shall be provided for each 10 employees of each sex, or numerical fraction thereof” (29 CFR 1910.141(d)(3)). The same paragraph calls for hot and cold water, body soap, and individual clean towels.
- Construction toilets: one toilet for 20 or fewer workers; for 20 or more, one toilet seat and one urinal per 40 workers; for 200 or more, one per 50 (29 CFR 1926.51, Table D-1).
From ratio to trailer
Count each sex separately for the general-industry rule, then round up: 25 men and 12 women need three showers for the men and two for the women. Shift changes bunch demand, so size to the busiest hour, not the day's headcount.
At about 10 people per stall, before splitting by sex:
- 3 stalls, about 30 people: the 13ft Luxury Shower-Restroom Combination Trailer (3 Individual Stalls) (starting from $2,495 / month), showers and toilets in each stall.
- 5 stalls, about 50 people: the 20ft Shower Container (5 Individual Stalls) (starting from $3,995 / month), showers only, so pair it with restrooms.
- 6 to 8 stalls, about 60 to 80 people: the 22ft Luxury Shower-Restroom Combination Trailer (6 Individual Stalls) (starting from $4,995 / month) or the 30ft Luxury Shower-Restroom Combination Trailer (8 Individual Stalls) (starting from $3,995 / month).
- 10 stalls, about 100 people: the 30ft Luxury Shower-Restroom Combination Trailer (10 Individual Stalls), or several units side by side, plus an ADA unit where a cluster calls for one.
Split by sex for the general-industry rule: a 3-stall trailer shared by men and women covers fewer people than one used by a single group.
These are planning figures, not legal advice; the standard that applies to your site, and your local health authority, set the final count. Call us with the headcount and shifts and we'll size it in the quote.
Sources
- OSHA 1910.141: Sanitation (general industry): Where a standard requires showers: one shower for each 10 employees of each sex, hot and cold water, soap, and individual towels.
- OSHA 1926.51: Sanitation (construction): Table D-1: one toilet for 20 or fewer workers; one toilet seat and one urinal per 40 workers above that.
Links checked 2026-11-06. Figures quoted above appear on the linked pages.
