A standard construction unit measures about 44 inches square and roughly 90 inches tall, holds a 60-gallon waste tank, and serves roughly 10 workers per unit on a 40-hour week under common jobsite guidance. OSHA…

A standard construction unit measures about 44 inches square and roughly 90 inches tall, holds a 60-gallon waste tank, and serves roughly 10 workers per unit on a 40-hour week under common jobsite guidance. OSHA sanitation rules (29 CFR 1926.51) require at least one toilet on sites of 20 or fewer workers, one toilet and one urinal per 40 workers on larger crews, and additional units as headcount climbs, which is why crew size drives unit count more than site size. A Logan Square two-flat rehab with 6 tradespeople often runs one standard unit; a mid-rise concrete pour near Bronzeville with 45 workers on the deck typically needs at least two toilets plus urinal capacity.
Standing water and heat change service frequency. A single weekly pump handles a 10-worker crew comfortably, but summer heat on an exposed Pilsen or Bridgeport site pushes many contractors to twice-weekly service to keep tanks from overloading between visits. If it is a single-trade punch-list week with 4 workers, one standard unit on weekly service fits; if it is a full framing or masonry phase running 30-plus workers, plan two or more units plus a hand-wash station to meet demand and cut wait time.
Access controls scheduling on Chicago sites. Units are set on gravel pads, plywood, or level dirt within reach of a service truck's 25-foot hose; alleys in Wicker Park and Avondale, tight gates in Lincoln Park, and permit streets near Hyde Park all affect where a unit lands. Placement on a public way or blocked lane may require a City of Chicago right-of-way or street-use permit obtained by the contractor before delivery. Windy City Portable Toilet Rental can reposition a unit as a foundation, framing, and finish sequence opens different zones of the lot.
An ADA-compliant construction unit is wider, at roughly 62 inches inside with a ground-level entry, and is required where a jobsite must accommodate workers with mobility needs. A hand-wash station holds fresh-water and gray-water tanks for foam or liquid soap and is commonly paired with restrooms during concrete and demolition phases in Uptown and Rogers Park where dust and residue are heavy.
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