A headcount buffer is sometimes free and sometimes expensive, and which one depends entirely on where your number sits on the vehicle ladder. Between 14 and 24 passengers the hourly rate does not move at all, so a 10 per cent buffer costs nothing. Between 24 and 25 it changes the vehicle, the hourly rate and the minimum hire in one step. Find your band edge before you decide how much margin to carry, and book to the ceiling you can realistically reach.
Where a buffer is free and where it is expensive
Every figure below is from the published rate card. Seat counts exclude the driver, and rates are GST inclusive.
| If your number lands here | Vehicle | Hourly rate | Minimum hire | Cost at the minimum |
|---|---|---|---|---|
| 1 to 7 | Mercedes V-Class | $125 | 3 hours | $375 |
| 8 to 12 | Toyota Commuter | $110 | 3 hours | $330 |
| 11 to 14 | Mercedes Sprinter | $145 | 3 hours | $435 |
| 15 to 24 | Executive minibus, 21 to 24 seats | $145 | 3 hours | $435 |
| 25 to 27 | Executive midi-coach | $165 | 4 hours | $660 |
| 28 to 48 | Luxury coach | $185 | 4 hours | $740 |
| 49 to 53 | Executive coach | $195 | 4 hours | $780 |
| 50 to 57 | Luxury touring coach | $195 | 4 hours | $780 |
| 58 or more | Coordinated convoy | Quoted per event | n/a | Quoted per event |
Two rows overlap on purpose. Between 11 and 12 passengers there are two options, a Toyota Commuter at $110 an hour or a Mercedes Sprinter at $145, and the difference is vehicle standard rather than capacity. The same is true at the top of the ladder, where a 53-seat executive coach and a 50 to 57 seat luxury touring coach share a rate. It is also why a group of five on a Mercedes V-Class pays more per hour than a group of ten on a Toyota Commuter: the V-Class is priced on standard, not on seats.
Read across the middle of that table and the shape of the problem is obvious. From 14 passengers to 24 passengers, the rate is $145 an hour and the minimum is three hours. Ten extra people cost nothing. A group expecting 20 can carry a buffer all the way to 24 without a single dollar of change.
Then look at what happens next. A group of 25 moves to a 27-seat executive midi-coach at $165 an hour on a four-hour minimum. The minimum booking goes from $435 to $660. That is $225 for one additional passenger, and it is the most expensive person on the entire ladder.
Compare that with the step above it. Going from 27 to 28 passengers moves you to a 48-seat luxury coach at $185 an hour, still on a four-hour minimum. The minimum booking rises from $660 to $740, and in exchange you get 21 spare seats. Eighty dollars for twenty-one seats is one of the best-value steps you will find. You can check all of it against the published fleet ladder and hourly rates.
The 22-seater case, worked
A 22-person group is the most searched version of this question and the easiest one to answer well.
Twenty-two people travel on the 21 to 24 seat executive minibus at $145 an hour with a three-hour minimum, which is $435 for the minimum booking, or $19.77 a head. Two more guests accept and you are at 24. The vehicle does not change, the rate does not change, the minimum does not change, and the per-head figure improves to $18.13.
One more guest after that and you are at 25, on a different vehicle, at a different rate, with a different minimum. The whole planning question for a 22-person group is therefore not “how big a buffer should I carry” but “am I genuinely at risk of reaching 25”. If the honest answer is no, book the minibus and stop worrying. If the honest answer is yes, price both and decide deliberately, because how minimum hire hours change with vehicle size is doing as much work here as the hourly rate.
Book to your realistic ceiling, not your RSVP count
The instinct is to book to the number of yes replies you have today. That is the wrong number, because RSVPs move in one direction more often than the other and because the seat count is a hard limit rather than a soft one.
It is genuinely hard. In NSW, a passenger aged 16 or over must wear a fitted seatbelt on a coach, so every passenger needs a seat of their own. There is no standing, no sharing and no squeezing one more person on at the kerb. A 24-seat vehicle carries 24 people and the twenty-fifth does not travel.
So the working rule is: book to the highest number you can realistically reach, then check whether that number sits inside the same band as your current count. If it does, the buffer is free and you should take all of it. If it does not, you are making a real financial decision and it deserves five minutes rather than five seconds.
A 10 per cent buffer is a reasonable default for a function where invitations are still out. It is the wrong default if 10 per cent takes you across a band edge, and it is unnecessarily cautious if you have 30 spare seats already.
The one band edge worth planning around
If your expected number is 22, 23 or 24, you are sitting directly beneath the most expensive step on the ladder. Three questions settle it.
- How many people are still unanswered, and what is the realistic worst case?
- If you go over, is anyone able to make their own way, or is transport promised to everyone?
- Is the extra $225 at the minimum booking, and $20 an hour beyond it, worth removing the risk entirely?
There is no universally right answer. What is wrong is arriving at the question on the morning of the event.
Five steps for booking before your numbers are final
- Enquire early even though your numbers are not final. Most jobs need two to four weeks of lead time, and four to eight weeks for December, race days, school excursion season and long weekends. Waiting for RSVPs to close can cost you the vehicle entirely. Send the pick-up suburb, the date and an estimated group size and a written quote comes back within two business hours.
- Ask for two quotes at once, one at your expected number and one at your realistic ceiling. Seeing both makes the band edge visible immediately.
- Get the amendment terms in writing before you pay a deposit. Ask specifically whether the vehicle size can be changed after the deposit, in which directions, and by what date. Cancellation terms are set out in the written quote, so ask for the amendment terms to be there too.
- Set your own numbers-final date and put it in the invitation, comfortably before the operator’s deadline rather than on it.
- Name a single day-of contact with a mobile number, and make sure it is not the person hosting the event.
Frequently asked questions
Can I book a bus before I have final numbers?
Yes, and you generally should, because vehicles are allocated on lead time rather than on certainty. Send an estimated group size and ask for the quote at your expected number and at your realistic ceiling. Get the terms for changing vehicle size in writing before you pay the deposit.
What buffer should I allow?
Enough to stay inside your current seat band. Between 14 and 24 passengers the vehicle and the rate do not change, so a buffer there is free and you should take all of it. Between 24 and 25 the vehicle, rate and minimum hire all change, so a buffer there is a genuine cost and worth deciding on deliberately.
What happens if more people turn up than we booked for?
They do not travel on that vehicle. Every passenger needs a seat, because in NSW anyone aged 16 or over must wear a fitted seatbelt, so the seat count is a hard ceiling rather than a guideline. This is why the ceiling number matters more than the expected number when you book.
How many people does a 22 seater bus hold?
Twenty-two passengers plus the driver, and it sits within the 21 to 24 seat executive minibus band at $145 an hour on a three-hour minimum. If your group grows to 23 or 24, nothing about the booking or the price changes.
Can we go down a size if fewer people come?
Ask for that in writing at quote stage rather than assuming it. It is a reasonable request and it is the mirror image of going up, but it depends on the terms in your quote and on what else is booked for that date.
Next step
Send your expected number and your realistic ceiling together, along with the date and the pick-up suburb, and we will quote both so you can see exactly where the band edge falls. For wedding bus hire in Sydney and other functions where RSVPs are still open, that comparison is usually the whole decision. Call 02 9469 6600, Monday to Friday 7am to 6pm or Saturday 8am to 2pm.
Sources
- Transport for NSW, Seatbelts, https://www.transport.nsw.gov.au/roadsafety/topics-tips/seatbelts. Accessed 7 September 2026.
- NSW Legislation, Road Rules 2014 (Part 16), https://legislation.nsw.gov.au/view/whole/html/inforce/current/sl-2014-0758. Accessed 7 September 2026.
