Can’t answer for sure but I know multiple trademens that use 240v at people homes. 1000s of carpet cleaners work every day in peoples homes and I don’t think one of them use 110v
Now I think about it, 240v must be totally legal in people’s homes, Chemdry International a multimillion pound organisation who puts 100s of workers in peoples homes uses 240v and they will have looked into the legalities of the doing so