Wedding Washroom Trailer Guide: How Many Stalls Do You Need?

Nothing undermines a beautiful outdoor wedding faster than a washroom lineup. The good news: sizing a restroom trailer is one of the more predictable parts of wedding planning, because usage follows guest count, event length, and bar service fairly closely.

This guide gives you the working numbers Canadian providers use, plus the factors that should push you up a size.

Stall count by guest count: the working table

For a standard evening reception (5–6 hours, dinner plus bar), these pairings work well:

• •Up to 75 guests — 2-stall trailer. Comfortable, no meaningful lines.
• •75–150 guests — 2-stall works but 3-stall is more comfortable, especially with open bar.
• •150–250 guests — 3–4 stall trailer. The most common wedding configuration in Canada.
• •250–350 guests — 6-stall trailer, or a 4-stall plus a separate 2-stall placed near the bar.
• •350+ guests — 8–10 stall executive trailer or two trailers at separate stations.

Factors that push you up a size

Guest count is the starting point, not the whole answer. Move up one size if two or more of these apply:

• •Open bar or signature cocktails — alcohol meaningfully increases washroom traffic.
• •Event runs longer than 6 hours (ceremony + cocktail hour + reception on one site).
• •No backup facilities — the trailer is the only washroom on the property.
• •Formal attire — gowns take longer per visit; queues form faster than raw stall math suggests.
• •Summer heat — more hydration, more traffic. Common at July–August weddings in Toronto and Montreal.

Placement, power, and the details people miss

Position the trailer 20–40 metres from the reception tent: close enough to find easily, far enough for privacy and noise. It needs firm, level ground and a clear route for the delivery truck — confirm gate widths and overhead clearance with your venue.

Power and water are the other planning items: most trailers run on standard connections or a quiet generator, and carry onboard fresh water for a typical reception. Our power and water requirements guide covers the specifics to confirm with your provider.

For the complete planning sequence — timelines, deposits, day-of logistics — use the wedding rental checklist, and see how many washrooms an outdoor wedding needs for the full sizing methodology.

Get it booked

Summer Saturdays book out months ahead in every major market. Once you have your guest count and venue, request quotes from vetted providers — comparing two or three keeps pricing honest and confirms availability for your date.