Sources

Last reviewed:

This is every outside source the calculator, costs page, FAQ and guides rely on. The list is short because few organizations publish wedding restroom figures at all, and most of those that do are rental companies. The rest are the ADA Standards and one county planning page. Where a number on this site is our own estimate rather than a published figure, the methodology page says so.

Each entry shows the date we last checked its link and figures: October 17, 2026 for sources added or rechecked in this update, October 16, 2026 for the rest. Page dates are shown as each page displays them.

Stahla Services

A restroom and shower trailer rental company. Its guides are vendor content, not independent research.

  • Stahla Services — Restroom Trailer Size Guide

    Supports on this site: The calculator's event-type divisors (guests ÷ 100 for a ceremony, ÷ 50 for a cocktail reception, ÷ 40 for a dinner reception), the 1-stall-per-50-guests rule for a 4–6 hour event, and the +20% adjustment for alcohol or events over 6 hours. We also cite its guest-count chart as a contrast to our more conservative trailer mapping. On the costs page and FAQ: its site requirements (a level, stable surface within 150 feet of the event, 3 feet of clearance on all sides, a clear truck path, 20-amp 120V power for basic units and up to 50-amp for larger ones, a water connection or 150–200 gallon tank, and a sewage hookup or pump-out), its 1–2 day delivery and pickup window, and its ADA trailers in 2- to 10-stall sizes. On the calculator page: its suggestion to plan a wedding reception for 90–95% of confirmed guests.

    Published December 30, 2020; no update date shown. Checked October 17, 2026.

    https://stahla.com/what-size-of-restroom-trailer-do-i-need/

  • Stahla Services — Restroom Trailer Rental Cost (2026 Guide)

    Supports on this site: Published list prices we compare our ranges against (2-stall $2,799, 4-stall $3,399, 8-stall $4,799 and 10-stall $5,699 per event), setup and pack-up fees, delivery mileage, generator and water-delivery costs, and the 15–30% peak-season (May–October) price increase. Also that 1–3 day event rentals are priced as a flat event rate, not per night. Also the booking lead times in our FAQ and costs tips (at least 3–6 months ahead; 6–12 months for popular June or September Saturdays; 6–8 weeks off-season), holiday-weekend premiums, 10–20% off-season (November–March) discounts and multi-unit volume discounts.

    Published January 8, 2026; price table marked updated October 15, 2026. Checked October 17, 2026.

    https://stahla.com/how-much-does-it-cost-to-rent-a-restroom-trailer

  • Stahla Services — Peak Season Planning for Summer 2026

    Supports on this site: The 3–6 month minimum booking window for peak-season wedding rentals mentioned in our booking advice, and the 10–15% early-booking discounts mentioned on the costs page.

    Published July 29, 2025; no update date shown. Checked October 17, 2026.

    https://stahla.com/peak-season-planning-how-to-lock-premium-restroom-trailers-summer-2026/

United Site Services

A portable sanitation rental company. Its sizing guidance is for standard portable toilets as well as trailers.

  • United Site Services — How to Get the Right Number of Portable Toilets for Your Event

    Supports on this site: The general point that alcohol service increases restroom visits and that longer events need more units. It gives no percentage, so the 20% figure comes from Stahla, not from this page.

    Published May 14, 2013; no update date shown. Checked October 16, 2026.

    https://www.unitedsiteservices.com/how-to-get-the-right-number-of-portable-toilets-for-your-event/

  • United Site Services — Bathroom Rentals for Weddings

    Supports on this site: Cited on the methodology page as a contrasting rule of thumb (one standard porta potty for every 8 guests), to show how much vendor guidance varies. On the costs page: its Silver, Gold and Platinum wedding trailer tiers and the fixtures it lists for each.

    No date shown. Checked October 17, 2026.

    https://www.unitedsiteservices.com/events/weddings/

  • United Site Services — Restroom Trailer and Shower Trailer Rentals: Water and Power Requirements

    Supports on this site: The power and water requirements on the costs page and FAQ: a dedicated 20-amp/110-volt source within 50 feet of the front of the trailer (one or two outlets for smaller units, three or four for larger ones), generator or solar options, a spigot and garden hose as the preferred water supply or a monitored holding tank, and checking the delivery path for shrubbery, septic systems and sprinklers.

    Published February 19, 2014; no update date shown. Checked October 17, 2026.

    https://www.unitedsiteservices.com/restroom-trailer-shower-trailer-rentals-water-power-requirements/

Rumpke

A waste, recycling and portable restroom company that rents restroom trailers. Its page is vendor content.

  • Rumpke — Portable Restroom Trailers

    Supports on this site: Two separate 30-amp circuits per trailer, 20-amp-rated extension cords, garden hose or onboard tank water, flat ground with 4 feet of clearance for the steps, what its rental includes and what the customer supplies, its 2- to 12-person unit layouts (toilets and urinals per side), and its statement that it does not currently offer ADA-accessible restroom trailers.

    No date shown. Checked October 17, 2026.

    https://www.rumpke.com/business/portable-restrooms/trailers

U.S. Department of Justice (ADA.gov)

The official text of the 2010 ADA Standards for Accessible Design.

  • 2010 ADA Standards for Accessible Design — §213 Toilet Facilities

    Supports on this site: §213.2 Exception 3: where single-user portable toilet units are clustered at one location, no more than 5% of the units in each cluster must meet the accessible toilet-room requirements of §603. This is the basis for the calculator's 5% accessibility suggestion, which we label as planning guidance.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#213-toilet-facilities-and-bathing-facilities

  • 2010 ADA Standards for Accessible Design — §304 Turning Space

    Supports on this site: §304.3.1: a circular turning space is 60 inches in diameter minimum (a T-shaped space is also allowed). §603.2.1 requires that turning space inside an accessible toilet room.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#304-turning-space

  • 2010 ADA Standards for Accessible Design — §604 Water Closets

    Supports on this site: §604.4: toilet seat height 17–19 inches; §604.5 and §609.4: grab bars on the side and rear walls, 33–36 inches above the floor; §606.3: sink rim or counter 34 inches maximum. Cited in our FAQ and homepage description of accessible units.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#604-water-closets-and-toilet-compartments

  • 2010 ADA Standards for Accessible Design — §402 Accessible Routes

    Supports on this site: §402.2 and §403.3: walking surfaces on an accessible route have a running slope no steeper than 1:20, while ramp components of the route may be steeper (§405); §302.1: floor and ground surfaces are stable, firm and slip resistant. Cited in the FAQ answer on accessible trailers.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#402-accessible--routes

  • 2010 ADA Standards for Accessible Design — §404 Doors, Doorways, and Gates

    Supports on this site: §404.2.3: door openings provide a clear width of 32 inches minimum. Cited in the FAQ answer on accessible trailers.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#404-doors-doorways-and-gates

  • 2010 ADA Standards for Accessible Design — §405 Ramps

    Supports on this site: §405.2: running slope not steeper than 1:12; §405.6: rise of 30 inches maximum per ramp run; §405.7: landings at the top and bottom of each run, 60 inches long minimum; §405.8: handrails on runs that rise more than 6 inches. Cited in the FAQ answer on accessible trailers.

    Standards adopted in 2010. Checked October 17, 2026.

    https://www.ada.gov/law-and-regs/design-standards/2010-stds/#405-ramps

County planning and permit rules

A local example cited in the FAQ to show that permit rules depend on the county. It is not a guide to your county's requirements.

  • County of San Luis Obispo Planning & Building — Events

    Supports on this site: Renting out barns or fields for wedding ceremonies and receptions requires the property to meet certain standards and obtain the correct permit; a wedding venue is given as an example that would most likely require Minor Use Permit approval.

    No date shown. Checked October 17, 2026.

    https://www.slocounty.ca.gov/departments/planning-building/how-to-apply-for-a-permit-in-unincorporated-slo-co/land-use,-subdivision,-zoning/zoning/allowable-uses/events-and-camping/events

Published price guides

Used only to cross-check our planning price ranges. Two are rental companies quoting their own regional prices, and one is a quote marketplace.

  • The Lavatory (Arizona) — Restroom Trailer Rental Cost: A 2026 Guide

    Supports on this site: 2–3 stalls $800–$1,500, 4–6 stalls $1,000–$2,500 and 7+ stalls $2,500–$8,000; generators $150–$300 per day; water delivery $100–$250 per trip; about $3–$4 per mile beyond the free delivery radius; attendants billed hourly.

    Dated August 19, updated September 23 (year not shown). Checked October 16, 2026.

    https://www.thelavatoryaz.com/post/restroom-trailer-rental-cost

  • Mobile Thrones — How Much Does It Cost to Rent a Porta Potty for a Wedding?

    Supports on this site: Wedding trailer prices of $900–$1,200 (2-stall), $1,200–$1,500 (3-stall) and $1,500–$1,800 (4-stall), with delivery, setup and pickup included in its service area.

    Published April 22, 2025. Checked October 16, 2026.

    https://mobilethronesusa.com/blog/how-much-does-it-cost-to-rent-a-porta-potty-for-a-wedding

  • 360Connect — Restroom Trailer Rental Cost: What You Need to Know

    Supports on this site: Per-day ranges of $500–$1,000 (2–3 stalls), $1,000–$2,500 (4–6 stalls) and $2,500–$5,000 (7+ stalls), and $100–$500 extra for climate control.

    No date shown. Checked October 16, 2026.

    https://www.360connect.com/product-blog/restroom-trailer-rental-cost-what-you-need-to-know/

What is not sourced

Three things on this site are our own planning estimates, not published figures: the 10% increase for outdoor summer weddings, the way stall counts are matched to trailer sizes (including the 2-stall minimum), and the price ranges on the costs page, which we cross-checked against the price guides above but did not take from any one of them. The guest-capacity column on the costs page is also our rough estimate.

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