Bothies, refuges and huts run on rules nobody writes down

The theory of mountain shelters is well covered elsewhere. This is about the version you meet in practice.

Open shelters are a commons

A bothy or open refuge is available to anyone, which means space is allocated by arrival time and by everybody moving up. The convention that nobody claims more floor than they are using is what allows a small building to hold an unexpected party at midnight. A group that spreads out early and does not consolidate when others arrive is the single most common source of friction.

A large party arriving first carries the strongest obligation, since taking the smaller room, keeping gear in one heap and leaving the space nearest the stove clear costs them almost nothing and is what lets a building designed for six hold eleven at midnight.

Fuel and firewood follow a rule of replacement

Where a shelter has a stove, the convention is to leave at least as much dry fuel as you burned, and preferably more. In places without a wood supply this means carrying fuel in, which is why many shelters have unlit stoves and full coal buckets. The rule exists because the person who arrives soaked at 22:00 in February is not able to gather anything.

Locally, what gets burned matters as well, because salt-laden driftwood, painted or treated timber and unseasoned wood all produce corrosive smoke or heavy tar in the flue, and a chimney fire in a building no engine can reach is one of the ways these places are lost for good.

Waste discipline is absolute

Everything carried in comes out, including food waste, which does not decompose usefully and does attract rodents. The stronger convention is that you also carry out anything you find, which is what keeps shelters from silting up.

Locally, burying or burning rubbish in or near a shelter is the behaviour most likely to get a building closed by its owner. The same logic governs the toilet arrangements, because a shelter's water supply is almost always the nearest burn, so going well downstream of it and well away from the building is not fastidiousness but the reason the water is drinkable at all.

Staffed refuges work differently

Alpine and Pyrenean staffed huts operate on bookings, set meal times, indoor shoes and lights-out, and none of that is optional. The warden has authority over the building, including over who goes out in bad weather. Half-board pricing is standard, and turning up expecting to self-cater is usually not possible.

On the ground, most staffed huts also keep an unlocked winter room for the months the hut is shut, with blankets, a stove and an honesty box, and it is a genuine resource carrying the strict condition that it is left as found for whoever arrives next in worse weather.

These places exist because of volunteers

Most open shelters are maintained by volunteer associations under agreement with the landowner, with no public funding. Maintenance weekends, materials and transport are all donated, and the buildings survive on that goodwill. Joining the maintaining organisation costs very little and is the reason the next one is still standing.

The buildings themselves are usually somebody else's property — an estate outbuilding, a disused shepherd's house, an old mine bothy — kept open under an agreement that can be withdrawn, which is exactly why the associations care so much about what gets left behind.

A shelter is not a plan, and a stove indoors is a real hazard

Open shelters cannot be relied on: they fill up, landowners lock them, and some are demolished or closed long before the map or the app catches up. Anyone whose route depends on reaching one needs the equipment to spend the night outside if it turns out to be unusable, which is what the maintaining associations themselves advise.

Carbon monoxide is the specific indoor risk — a blocked flue, a stove run in a sealed room or a gas burner lit in a closed porch produces it with no smell and no warning. Keeping ventilation open while anything is burning, and never running a burner where people are sleeping, is the entire mitigation.

The takeaway

Behave as though the person arriving at midnight in bad weather is the one who matters. That is the whole convention.

Go slowly enough to notice, and most of this stops being advice and starts being obvious.