If an owner is happy for a sitter to use their car, this will be detailed on their listing. Whilst browsing our 'Find a house sit' page, you can use our filter option 'Use of car included' to bring up relevant sits.
However, an owner is under no obligation to provide a car for their sitter — even if their listing includes use of a car. A car is only available to the sitter once it has been discussed and agreed with the owner.
We would always advise that insurance for use of the owner's vehicle is arranged between the owner and the sitter.