It does seem a bit odd. 'home repairs' could easily be more then half of all real work done in a household per annum, if they don't hire contractors, depending on the age and size of the home.
I think the exclusion of car/home maintenance is based on the sexist belief that the people doing these tasks must enjoy them, and thus they are "hobbies" and not chores. I ran into this mentality with cooking and a previous partner: I like to cook as a hobby, so naturally the time I spend doing it because food needs to be produced must not count as a chore.
