Wheelie bins burn out quite prolifically, and they are enough in themselves, if parked under a window or against a combustible facade, to be the reason why a house is lost.

If a fence falls over as it burns, for your typical urban house lot it'll strike about the centre of your window and break it, even if that's a toughened glass or BAL-40 window. That's something that isn't actually addressed in building regulations at all, but it is a very prevalent way that houses are lost.

Typical separations we see between neighbouring houses, or houses and sheds on the same property, or houses and sheds on neighbouring properties, when they're significantly less than 12m, say around the 6m range or less, then there is a very high chance that one house can burn its neighbour down.

In a fairly built-up environment, we've seen wood piles against fences that are sufficient to take out a neighbouring property, built at that normal setback of 900mm from a boundary. And that can be with a non-combustible fence or with a combustible fence in place.