OSHA 29 CFR 1926.51(c) sets the minimum by crew size: 20 or fewer employees, one toilet; 20 or more, one toilet seat and one urinal per 40 workers; 200 or more, one per 50. An assessment also looks at whether workers can reach a toilet in under 10 minutes. Confirm the count with your safety manager.
Key takeaways
- OSHA 29 CFR 1926.51(c) sets the minimum toilet facilities for a construction site by the number of employees: one toilet for 20 or fewer, then one toilet seat and one urinal per 40 workers, and one per 50 for 200 or more.
- An OSHA assessment looks at whether employees can reach a toilet in under 10 minutes, so a large or spread-out site can need more than the headcount table suggests.
- No sourced Philadelphia rule for toilets on construction sites was found beyond OSHA, so the site manager should ask the city and the project's safety lead whether anything more applies.
- Large Philadelphia-area projects run for years. Schuylkill Yards in University City is planned over 20 years, and the Navy Yard master plan covers 109 acres.
- Servicing frequency and truck access matter as much as the unit count, because a full or blocked unit does not meet a crew's need.
- Philadelphia Porta Potty Rental connects you with an independent local provider who delivers, services and collects the units; the provider does not decide what your site is required to have.
What does OSHA require for toilets on a construction site?
OSHA 29 CFR 1926.51(c) sets the minimum by employee count: 20 or fewer employees, one toilet; 20 or more, one toilet seat and one urinal per 40 workers; 200 or more, one per 50. The numbers are the floor for the crew on the job, and your safety manager should read the standard itself.
The standard is a short table, and it is the only toilet rule found for Philadelphia construction in the research behind this page. That makes it the one to learn well. It counts employees, not square feet and not the size of the project, so a small crew on a huge site and a large crew on a small one come out differently.
The table below restates the figures as city and federal guidance describes them. At the edge, where a crew is exactly 20, secondary summaries phrase the line two ways, so check the wording of the standard itself before you finalize a count. Ask your safety lead to sign off on how the count is made.
Nothing here says that a particular unit satisfies the standard, and no provider can promise that for you. A provider can tell you what types of units it has and how many people a given setup is meant for. Whether the arrangement meets the requirement on your job is for your safety manager to decide.
| Employees on the job | Minimum as OSHA states it | Worked example |
|---|---|---|
| 20 or fewer | One toilet | A crew of 12 on a rowhouse gut renovation: one toilet |
| More than 20 | One toilet seat and one urinal per 40 workers | A crew of 80: two toilet seats and two urinals |
| 200 or more | One toilet seat and one urinal per 50 workers | A crew of 250: five toilet seats and five urinals |
| Any size, when assessed | Whether employees can reach a toilet in under 10 minutes | A tower site where the nearest unit is many floors away may need more than the headcount alone suggests |
How does the 10-minute rule change the count?
An OSHA assessment looks at whether employees can reach a toilet in under 10 minutes. A headcount that satisfies the table can still fall short if the only units are far away. Large, multi-level or spread-out sites often need several clusters of units, with servicing access to each.
The reasoning is easy to follow. A toilet at the far end of a large parcel is no use to a worker on the other side, and a toilet at street level is no use to a crew on an upper floor if the trip takes too long. The standard cares about whether a worker can actually get there.
On a Philadelphia project, that can mean different things. A rowhouse renovation is one lot, with a single spot for a unit. A multi-block redevelopment such as Schuylkill Yards, a 14-acre project in University City, has crews scattered across many parcels at once. The Navy Yard, a 109-acre plan, spreads work across a large campus of buildings and roads.
If you are not sure whether your layout passes the walk test, walk it yourself, at a worker's pace, from the farthest work area. Then tell the provider where the clusters would sit so they can check whether a truck reaches each one. For the placement side, see construction site portable toilets.
Which Philadelphia-area projects are large enough to matter?
Schuylkill Yards in University City covers 14 acres, more than $3.5 billion over 20 years, with about 10,000 construction jobs expected. The Navy Yard is a 109-acre plan, about $6 billion over roughly 20 years. Garden State Park in Cherry Hill and the Chester waterfront are other long builds.
These numbers come from published reports on each project, and they are plans, not guarantees of what is on site on a given day. They are useful because they show the kind of timeline a toilet plan has to fit. A project that runs for 20 years goes through many phases, and each phase has a different crew.
Schuylkill Yards broke ground in November 2017. The Navy Yard plan includes nearly 4,000 homes, and two apartment buildings, AVE Constitution with 347 units and AVE Normandy with 267 units, have opened. Garden State Park in Cherry Hill, a former racetrack that closed in 2001, is zoned for 1,644 units, and the Chester Waterfront Master Plan covers 100 acres.
For crews on projects of this kind, a one-off rental does not fit. They need a plan that adjusts as the work shifts from one area to another, which is the point of long-term portable toilet rental. A provider can talk through how units are added, moved and removed as phases change.
How do you work out the headcount?
Count the employees on the job, not the workers on the payroll. Use the peak number expected on site, add subcontractors who work there, and plan for the busiest phase. Then apply the OSHA table and the 10-minute walk test, and ask your safety manager to confirm the result before you give a provider the number.
A common mistake is counting from the first week. A crew of six becomes forty when the trades overlap, and the toilet count that was right in week one is wrong in week six. Look at the schedule and find the highest number of workers who will be on site at once.
Include everyone who works there: the general contractor's crew, subcontractors, inspectors who spend long stretches on site, and any delivery drivers who wait. If different shifts are staggered, ask your safety lead how the standard treats them. Do not rely on a rule of thumb from another project.
When you have a number, give the provider the range and the schedule, not a single figure. A provider can say how units can be added when the headcount rises, which is easier than discovering a shortfall on the day.
How often are construction site units serviced?
A provider sets a servicing schedule from the number of units and the number of workers using them. There is no single frequency for every site, and the 48-hour rule applies to portable chemical toilets in residential areas. A busy crew often needs more visits than a quiet one, and every visit needs truck access.
Servicing is where a count turns into a working arrangement. A unit that is full, or smells bad enough that workers avoid it, does not serve the crew, no matter what the table says. Ask the provider how many visits are in the quote and what an extra visit costs.
On a residential job, remember the city's servicing rule: a portable chemical toilet in a residential area must be serviced at least every 48 hours. A renovation next to occupied homes can fall under that rule, so tell the provider what kind of block you are on. Our page on delivery, pickup and servicing describes what a visit involves.
Do not let crew members try to empty, move or lift a unit. That job belongs to the provider, and a unit moved by hand can tip or spill. If a unit is damaged, full or leaning, call the provider and describe it.
What should you tell a provider about the site?
Tell the provider the address, the start and expected end dates, the peak headcount, where units can sit, and how a truck reaches them. Mention gates, locked fences, soft ground and any occupied homes nearby. Say whether you need handwash stations or an accessible unit, and ask for a written quote.
A good conversation is mostly about access. Is the site fenced, and who has the key? Will the truck have to cross a pavement, a plaza or a loading dock? Is the ground firm after rain? A unit placed on soft ground can lean, and a unit placed behind a locked gate may never be serviced.
Ask about handwash stations as well. A crew that eats on site, or works with materials that need rinsing, benefits from one, and handwash stations are priced as their own line. If the public or an inspector with accessibility needs will visit, ask about an accessible unit too.
Finally, ask what happens when the project changes. Phases end, crews move, and a fence gets relocated. A provider who knows the plan can adjust, and one who does not may leave a unit behind a wall of scaffolding.
What about a small residential job?
A small renovation crew of 20 or fewer falls under the one-toilet line, and the practical questions are access and servicing. Rowhouse lots are narrow, so ask the provider whether a truck can reach the spot, and check with the property owner and the city about placement on a pavement before delivery.
Most Philadelphia renovation crews are small. A single unit is often enough for the headcount, and the challenge is fitting it on the lot and getting a truck to it. The guide to placing a toilet at a rowhouse job covers pavements, permission and access in detail.
Cost works the same way at small scale. The quote depends on how long the unit stays and how often it is serviced, which the page on portable toilet rental cost in Philadelphia explains without dollar figures, because published listings vary.
Frequently asked questions
Does OSHA count toilet seats or units?
The standard is written in terms of toilet seats and urinals. Whether a given portable unit counts as one seat, one urinal or both is a question for your safety manager, since the provider cannot certify that a unit satisfies the standard. Ask the provider what each unit type includes.
Is there a Philadelphia city rule for construction site toilets?
No Philadelphia-specific rule beyond OSHA was found for this guide. A site manager should ask the city and the project's safety lead whether anything more applies.
What if my crew grows partway through the job?
Tell the provider the expected range at the start. Units can usually be added when a provider has them free, but a bigger crew means a bigger count under the OSHA table, and a short-notice request may take time. Review the headcount against the schedule every time a new trade arrives.
Can I place the unit on the pavement?
Placement on a public pavement raises questions about permission and passage that the property owner and the city can answer. Ask them before delivery, and ask the provider whether a truck can reach the spot. Keep the unit clear of doorways and away from a path people must use.
Who decides that my toilet count is enough?
Your project's safety manager, and ultimately the requirements that apply to your site. The provider supplies and services units but does not certify that a count meets OSHA. Use the table and the 10-minute walk test as a starting point, and keep a written note of how you reached the number.
Do I need handwash stations on a construction site?
Many crews add one, particularly where people eat on site. It is priced as a separate line from the toilet, so ask for it in the first quote. Whether your site is required to have one is a question for your safety manager, not for the rental provider.
Sources
This guide is general information for Philadelphia County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.