Pete & Pat Slade (Bouquet Garni) had the same a few years back. While they were at a gig an ex-wife of a previous occupant torched the property within a week of them moving in. They came home to a living fire. They were lucky, they had enough money to buy clothes etc and it took maybe £1000 to get a semblance of normality! The insurance took a bit longer than the laundarette. The result is that Pat can't rest easy out of the renovated house and doesn't do many gigs now.
I don't know what the solution is but it is something to look out for and maybe counsel them on.