What is the four-story rule?
Chicago's plumbing code says that in multi-story buildings no floor may be more than four stories from a story with toilet facilities. On a tower that means facilities at intervals up the building, not just at the ground. Confirm with the permit office how portable units fit the rule.
That is the code's wording, and this site does not interpret it beyond that. A worker on a floor must not be more than four stories from a floor that has toilet facilities, so the plan has to answer where those facilities are as the tower rises.
The permit office is the place to ask whether a portable unit on a floor counts, and what it expects. For the wider code comparison with OSHA, read the guide on construction site toilet requirements in Chicago.
Why do West Loop and River North towers make this hard?
Tight lots, crane footprints and street closures leave little room for units at ground level. The West Loop's 900 West Randolph, 43 stories, was completed in 2023. River North is full of galleries and commercial lofts. Provider access and servicing become the bottleneck.
The West Loop was redeveloped heavily, and reports say more than 6,500 new residences are coming. Active tower and loft sites there share streets with offices, restaurants and traffic. The Near North Side, which includes River North, is the most densely populated Chicago community area and has the second most skyscrapers after the Loop.
Both mean a provider is not simply dropping a unit on a lot. It is working around closures, loading zones and a site that may have one gate. The page on delivery and pickup covers access questions in more detail.
How do OSHA and the city count for a tower crew?
The city asks for at least one toilet per 30 employees or fraction. OSHA asks for one toilet for 20 or fewer workers, then one seat and one urinal per 40, and per 50 at 200 or more, and requires toilets reachable in under 10 minutes. The stricter figure governs.
On a tower, the 10-minute reach test is a real constraint. A trip from a high floor to the ground can eat much of that time before the worker even crosses the site. That is why the four-story rule and the OSHA reach time are often read together.
Unsanitary toilets do not count under OSHA, so servicing is part of compliance and not only a courtesy. Confirm the ratio with your permit office and your safety lead, and give the provider the final count.
What do you do about winter on a tall site?
Winter raises wind exposure, ice and freezing questions. Chicago's January average is about 25.2 F and wind chill can fall far lower. Ask the provider what it does for cold, and keep the route to each unit clear so workers do not delay trips.
Lake wind sweeps the flat city, and the upper floors of an unfinished tower feel it more than the street does. This site has no sourced local rule about winter handling or anchoring in wind, so the answer comes from the provider.
The cold-weather portable toilets page lists the questions to ask before the first freeze.
How long do tower sites tend to need units?
Tower projects run for many months, so units are a long rental and servicing matters as much as delivery. The Obama Presidential Center in Jackson Park, reported nearing full height, shows how long a large site can last. Ask the provider about a standing servicing schedule.
A rental that lasts through several seasons passes through Chicago's winter and its summer heat. The provider sets the servicing frequency, and this site promises none, so ask what it would propose and whether it changes with the season.
The page on long-term portable toilet rental explains how multi-month rentals work in general terms. Tell the provider the expected length of the project when you first call, since it shapes the whole plan.
