Conditions at a Glance

21.0%of housing units built in 2010 or later (ACS 2020–2024)

25nights a year at or below 32°F (NOAA 1991–2020 normals)

37.8 inaverage yearly precipitation (NOAA 1991–2020 normals)

Climate figures: NOAA 1991–2020 normals from the Seattle Sand Pt Wsfo, WA station, about 7 miles away.

Conditions for Job Sites

New Housing

About 21.0% of Seattle's housing units were built in 2010 or later (ACS 2020–2024), about 1.8 times the U.S. share of 11.4% and higher than three in four U.S. places in our data. Projects that build in phases can move units as each phase finishes; ask for relocation as a service visit when you book.

Homes From the 1970s and 1980s

The median year built for Seattle's housing is 1976 (ACS 2020–2024), older than most U.S. places in our data. Housing from that era is now 35 to 55 years old; crews replacing roofs, windows or mechanical systems on it need a toilet on site like any other crew.

Apartments, Townhouses and Rentals

The most common housing type is buildings with five or more units, about 51% of units (higher than nine in ten U.S. places in our data), followed by detached houses at about 37% (ACS 2020–2024). Apartment and condo projects bring larger crews, and a property manager decides where units go. About 56% of occupied homes are renter-occupied (ACS; owner share lower than nine in ten U.S. places in our data), so property managers and landlords often book the units for renovations and decide where they stand.

DOE's Building America map puts King County in the Marine climate region (IECC 2021 zone 4C, PNNL county guide). This region has mild temperatures most of the year but long damp seasons, so wet ground is usually a bigger issue than heat or cold.

Occasional Freezes

Only about 25 nights a year reach 32°F (fewer than three in four U.S. places in our data), but one hard freeze is enough to damage anything that holds water. A rare freeze mostly affects hand-wash stations on site; ask what happens to them when one is forecast.

Lead-Safe Renovation

About 53% of housing units predate 1980 (ACS 2020–2024). Under OSHA’s lead standard (29 CFR 1926.62), workers exposed to lead need adequate hand-washing facilities, and EPA’s RRP Rule covers paint-disturbing work in homes built before 1978; add hand-wash stations to the order on those jobs.

How Many Toilets

OSHA 29 CFR 1926.51(c)(1) sets the minimum number of toilets on a construction site by headcount:

Number of employees	Minimum toilet facilities
20 or fewer	1 toilet
20 or more	1 toilet seat and 1 urinal per 40 workers
200 or more	1 toilet seat and 1 urinal per 50 workers

Worked examples, rounding up as the table is usually read: 15 workers need 1 toilet. 45 workers need 2 toilet seats and 2 urinals (45 ÷ 40 = 1.125, rounded up to 2). 210 workers need 5 seats and 5 urinals (210 ÷ 50 = 4.2, rounded up to 5).

With so much multifamily housing here, a 45-person crew on an apartment or condo project is a realistic case: 2 toilet seats and 2 urinals.

Servicing frequency is set with the provider when you book; tell us headcount and shift length. OSHA's job-site toilet table has the full table.

Placement and Access

Put units on firm, level ground the service truck can reach, close to where crews work, clear of crane swing, excavation and vehicle routes, and move them as the work moves.

Near the Shoreline

Seattle's Census reference point is less than a mile from the shoreline in the Census Bureau's TIGER coastline layer (the layer includes Great Lakes shores and some bays). Waterfront job sites often mean sandy, soft ground and wind exposure; ask for a firm pad and staking.

Federal OSHA or State Plan

Washington runs an OSHA-approved State Plan, Division of Occupational Safety and Health (DOSH), Washington State Department of Labor and Industries, that covers most private-sector workers as well as state and local government workers (osha.gov State Plans, accessed 2026-10-13). State Plans must be at least as effective as federal OSHA, so check the State Plan's construction sanitation rule alongside 29 CFR 1926.51. osha.gov lists some coverage exclusions for this plan; the State Plan page shows which work they affect.

Who to Ask About Local Rules

Seattle is an incorporated city with its own municipal government. For a unit placed in the street, on a sidewalk or in another public right-of-way next to the job site, ask the Seattle city government before you book what applies.

If you rent your home, check with the landlord or property manager before a unit goes on the property.

What to Ask For

Crew size at the busiest point and shift length (OSHA sets the minimum by headcount)
Rental term and service frequency
A spot on site the service truck can reach
Whether units need to move as the work progresses
A gravel pad near the site entrance

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Construction Porta Potty Rental in Seattle: Questions

How do I book job-site porta potties in Seattle?

Call (888) 417-6737, answered 24/7, with the site address, dates and headcount. We connect you with a provider that serves Seattle, and the provider confirms units, price, delivery, servicing and pickup. Tell us the units you want; the provider confirms what's available for your site.

How many toilets for a 45-person crew?

2 toilet seats and 2 urinals: 45 ÷ 40 is 1.125, rounded up to 2, which is the usual reading of OSHA's 1926.51 table. For comparison, 15 workers need 1 toilet and 210 workers need 5 seats and 5 urinals.

Does Washington use federal OSHA or a State Plan?

Washington runs an OSHA-approved State Plan, Division of Occupational Safety and Health (DOSH), Washington State Department of Labor and Industries, that covers most private-sector workers as well as state and local government workers (osha.gov State Plans, accessed 2026-10-13). State Plans must be at least as effective as federal OSHA, so check the State Plan's construction sanitation rule alongside 29 CFR 1926.51. osha.gov lists some coverage exclusions for this plan; the State Plan page shows which work they affect.

Construction Porta Potty Rental in Seattle, WA