Short answer: For a UK event of up to about six hours, a common hire-industry starting point is one standard portable toilet for every 75 to 100 guests. Add more if there is alcohol, if you run into the evening, or if women are in the majority. Add an accessible unit for a public event, and baby-change if families are invited. These are planning guides only, not a legal quota. Confirm the number with your hire company, your venue and your local council.
In this guide
- Why there is no single legal number
- Estimate from the peak crowd
- Rules of thumb you can take to a hire company
- Weddings
- Village fetes and family days
- Cassette toilets and very small gatherings
- Accessible toilets and baby-change
- Servicing and restocking
- Where to put the units
- What to check before you book
- Worked examples
- FAQ
Why there is no single legal number
Organisers often want one official ratio. There is not one in this guide, and there is no UK-wide rule quoted here that says 100 guests must equal two toilets, or any other fixed sum. You still have to plan welfare. The Health and Safety Executive’s event safety guidance treats suitable facilities as part of running a safe event, alongside site layout and crowd safety.
Local councils, landlords and premises licences can set their own conditions, and those conditions change from place to place. A public field, a school ground and a private garden are not treated the same way. A brochure chart is a way to start a booking conversation. It is not approval from your council, and it is not a substitute for the venue contract.
Estimate from the peak crowd
Decide how many portable toilets to enquire about from the people who will actually be on the ground together, then adjust. Footfall across a whole day, and the number on the invitation, both mislead.
- Peak headcount. If evening guests replace day guests, count the overlap, not the sum of both lists. If a fete gate might see hundreds of people while the field holds far fewer, ask stewards what the busiest half hour looked like last time.
- Hours open. A short ceremony means fewer visits per person than a reception that runs from afternoon into the late evening.
- Alcohol. A free bar, a pay bar or a beer tent increases how often people go, and it keeps them on site.
- Food and hot drinks. Meals, tea tents and coffee stalls add visits. They often arrive as a rush when a course ends or speeches finish.
- Who is coming. Women, men, young children and guests who need step-free access do not share one cubicle type evenly. Standard units serve one person at a time, and urinals do not help women.
- Extras on top. Accessible provision and baby-change sit outside the standard count. Do not trade them away to make a quote look smaller.
Take the matching band from the table, then move up a step if two or more of these are heavy: alcohol, more than about six hours, a mostly female audience, or a long walk from the seating to the units.
Rules of thumb you can take to a hire company
Hire brochures in the UK cluster around ranges like the ones below. They do not match each other exactly. Use the range as a conversation opener, not as a precise formula. A peak near the top of a guest band should sit near the top of that toilet range.
| Guests at the peak | Little or no alcohol, about 2 to 4 hours | Alcohol, or about 6 to 8 hours |
|---|---|---|
| Up to 50 | 1 | 1 to 2 |
| 51 to 100 | 1 to 2 | 2 to 3 |
| 101 to 150 | 2 to 3 | 3 to 4 |
| 151 to 250 | 3 to 4 | 4 to 6 |
| 251 to 400 | 4 to 6 | 6 to 9 |
| 401 to 500 | 5 to 8 | 8 to 12 |
These counts are standard lockable cubicles, not urinal places. A urinal unit can shorten a queue for men. It does nothing for women, so do not strike off cubicles because a urinal appears on the quote. If women make up clearly more than half the audience, lean to the higher figure. Above about 500 people, or on a multi-day site, ask the hire company for a written suggestion rather than stretching this table. The accessible unit is additional.
Weddings
Weddings bunch demand. Guests leave the ceremony together, sit through a meal, then stand up again when speeches end. That pattern needs the longer column even when the vows themselves were short. Use the largest number on site at once. Day guests and evening guests are not added together if one group has already gone home.
Check whether venue toilets stay open, unlocked, lit and signed for the whole event. A hall with indoor cubicles can lower the portable order. A nearby pub that has not agreed to anything cannot. Trailer units with washbasins and mirrors are a comfort choice some couples add. Ask how many guests that trailer is meant to cover before you drop several standard cubicles from the list.
Village fetes and family days
At a fete, total entries through the gate are the wrong denominator. People come and go. Book for the thickest crowd you can justify, and tell the hire company that the figure is a peak, not a day total. Children add short, sharp queues after the gates open and again after lunch. They need a dry path, a low step and room for an adult to wait outside.
A potty in a car boot is not provision for the public. Choosing a small toilet that a child will agree to use on a family trip is a different job, covered in Kids and Camping Toilets: Choosing One Children Will Actually Use. If a cake stall or tea tent is part of the fete, include handwashing in the hire. A toilet with nowhere to wash hands is a weak plan beside food. A lunchtime drinks table is enough reason to prefer the higher end of the band.
Cassette toilets and very small gatherings
A garden gathering of a few households, with the house open, may not need a hired cubicle at all. If the house cannot cope, one event unit is still a better fit for a queue of adults than a camping cassette. Cassette toilets, with a small flush tank and a removable waste tank, are made for cars, campers and tents. They are a poor substitute for fete or wedding provision, and you need a practical, permitted place to empty them.
For a closer look at one compact model aimed at that personal use, see the Camco 5.3 Gallon Portable Toilet Review: Is It Worth It?. Use it to judge a household or camping purchase, not to replace a hire quote for a crowd.
Accessible toilets and baby-change
For a fete, fair or other event the public can attend, add at least one accessible portable toilet on top of the table. The Equality Act 2010 is concerned with reasonable adjustments, not with a universal toilet ratio, and what is reasonable depends on the setting. A private invitation in a garden is not the same situation as a public field event. If you do not know which duties apply, ask the venue and the council rather than guessing.
An accessible unit needs a ramp or a very low threshold, grab rails, and space to manoeuvre. The path has to be firm, wide and clear of cables and long grass, otherwise the booking does not help the person it was ordered for. Not every disabled guest uses a wheelchair. Rails, time and a cubicle that is not jammed against the general queue still matter, which is why this unit is not spare capacity.
Baby-change is a separate need. Hire firms often fit a fold-down shelf in a larger cubicle. On a small order that shelf may sit inside the only accessible unit, and a nappy change then blocks step-free access. Sign that clearly, and split the two jobs if you can take two larger units. If you expect buggies, also provide a lidded bin. There is no national baby-change quota in this guide.
Servicing and restocking
Tank capacity varies by model, flush and how the unit is used, so ask the company what they assume for the cubicle on your quote. Do not copy a uses figure from a different product and treat it as yours. A short daytime hire is often delivery plus collection. A late wedding, or a second day, needs a booked empty. That visit needs a vehicle route that still exists once stalls and cars are in place, and a time that misses the meal.
Paper and soap usually run out before the tank is full. Leave a restock bag with a named person and check halfway through. A cubicle with an empty dispenser is a cubicle you have lost. Keep chemical handling with the hire company. Do not tip leftover fluid into a ditch, a drain or a hedge.
Where to put the units
Guests use toilets they can see and reach in a short walk from the seats or the busiest stall. They avoid a unit that rocks, that smells across the tea table, or that sits at the end of a mud path. Downwind of the marquee is better when the ground allows. Leave room for the delivery lorry and for a later tanker, and do not block emergency access or a neighbour’s gate.
After dark, light the path and the doors without flooding a neighbour’s windows. Sign the route from the entrance and from the bar. If rain is likely, ask about boards so the approach does not become a slip hazard. A sensible number in a bad place still fails. Layout, vehicle movement and welfare belong in one plan, which is also the spirit of the HSE event safety material linked above.
What to check before you book
Tell the hire company the peak headcount, the hours, when alcohol is served, whether you are feeding people, the share of children, accessible needs, baby-change, gate width and ground conditions. Ask them to write the recommended mix into the quote, including whether a urinal is included and what it is supposed to replace. On the women’s side, it should replace nothing.
Then look outside the brochure. The venue agreement may insist on a minimum, or it may forbid portable units in a particular yard. The council events team, or the licensing team if alcohol needs a licence, may ask for your welfare note when you tell them about the event. Requirements differ by authority, so check the council that covers the land you are using. Write down what you agreed with the hire company, including servicing times.
Worked examples
These sketches only show the arithmetic. They are not recommended orders, and a hire company or council may ask for something different.
Wedding. About 150 people on site together, a bar open, roughly eight hours. The longer column for 101 to 150 guests suggests on the order of three to four standard units. Formal dress and a bar are reasons to ask for a price on four or five, plus one accessible unit. If two venue cubicles stay open, unlocked and signed all evening, you can talk about dropping back towards four standard units, not towards one.
Fete. Perhaps 300 entries over the day, about 120 people on the field at the peak, a tea tent, a small bar from noon, and many children. Ignore the 300 for the toilet sum. The shorter band for about 120 guests might suggest two or three standard units. Children, tea and the bar are reasons to discuss three or four, plus one accessible unit. If baby-change shares that accessible cubicle, say so on the sign so a parent is not surprised, and neither is a wheelchair user.
Garden lunch. Thirty guests, the house open, no bar, three hours. Indoor toilets may be enough. If they are not, compare one hired cubicle. A cassette toilet is the wrong tool for thirty adults. If a guest needs step-free access, add an accessible unit even at this size, or confirm that a ground-floor toilet in the house genuinely works for them.
FAQ
Is there a legal minimum number of portable toilets in the UK?
Not as a single national guest-to-toilet ratio that this guide can quote. Councils, venues and licences set their own conditions, and those conditions vary. A public event still needs a welfare plan you can explain. Ask the council for the land you are using, and ask the venue, before you treat a brochure chart as the final word.
Do accessible toilets count towards the standard total?
No. Keep the accessible unit as an extra. Guests who need rails or step-free access should not have to win a race against the general queue. Other guests will use it too. That is a reason to protect it, not a reason to delete a standard cubicle.
Should I use total attendance or the busiest moment?
Use the busiest moment. A fete with several hundred entries across the day may only have a fraction of that number on the field at once. A wedding only needs the combined day and evening lists if those guests are actually there together. Tell the hire company which figure you have used.
What if most of the guests are women?
Move to the top of the range, or add a cubicle. Standard units serve one person at a time, and a urinal only helps men. Do not cut the order because a urinal makes the quote look more efficient. Formal dress and a long walk make queues feel longer still, so those are further reasons to stay at the higher end.
How often should event toilets be emptied?
Only the hire company can say for the unit they are sending, because tank size and flush design vary. For a single short day, delivery and collection often cover it. For a long evening or a second day, book a service visit with a clock time and a vehicle route. Restock paper and soap yourself even if the tank does not need emptying.
Can indoor toilets replace portable ones?
Sometimes. Count only cubicles that stay open, lit and signed, and that guests are actually allowed to use for the whole event. A locked church, an upstairs bathroom, or a cafe that has not agreed will not help at the peak. If the indoor toilets are suitable, ask the hire company to reduce the portable order and put that agreement in the booking notes.
Sources
- Health and Safety Executive: event safety. Cited for event welfare, site layout and safety planning. The guest-to-toilet ranges in this article are widely used hire-industry rules of thumb. They are not presented here as figures taken from that HSE page, and they are not a legal standard. Confirm numbers with your hire company, your venue and your local council.
