Arriving together is the exception
Project teams almost never land as a group. Tickets get booked at different moments, someone stays behind to close things out at home, and there is always a specialist who joins two or three days later.
None of that complicates the lodging if it is raised at booking. What does complicate it is assuming everyone walks in on the same day, and then discovering at eleven at night on Tuesday that the third technician has no idea how to open the door.
Access is the first thing to settle
Access to the house is self check-in: no front desk, no check-in window, nobody waiting with a key. That is precisely what makes a 2 a.m. arrival possible, and it is also what requires each person to know how to get in before they land.
The simplest way to handle it is to make one person on the team the single point of contact, and have them pass the access instructions to each traveller before their flight rather than after. If you would rather we send the instructions to each person individually, tell us and we will do it that way.
Who assigns the bedrooms
The house has 3 bedrooms and 5 beds. When arrivals are staggered, whoever walks in first tends to claim the best bedroom by default, and that quietly sours the rest of the stay.
The fix is not ours, it belongs to the team lead: assign bedrooms before the first flight leaves, taking shifts into account. If somebody is going to be leaving before dawn for weeks, they should not be sharing a room with someone who sleeps through the night.
When the stay starts, and how it is invoiced
The booking is for the whole property, not per person. The stay therefore runs from the date the house is made available to the team, even if the last member arrives three days later.
That is an advantage when the team grows and a disadvantage if you expected to pay per person, per night. It is worth understanding before booking: if your budget is built from individual per-diems, convert it to a property cost in the spreadsheet before you request approval, not afterwards.
The short list for staggered arrivals
Send us at quote time: the date of the first entry, the date of the last entry, total headcount, and whether anyone will be working a different shift. That is enough for us to tell you whether the dates are open and how the stay would be structured.
On your side, decide before the first flight: who the point of contact is, how each person receives the access instructions, who has which bedroom, and who locks up on departure day. Four decisions that take ten minutes and remove most of the friction of the first week.