butlers pantry with extra stove, fridge and sink
after oc, fill in doorway to your kitchen

Room with the plumbing in place and electrics that can be fitted out post build as a kitchen - eg a "home office" that has a sink and a bathroom…

You cant do an attached granny flat?
That’s what weve done, no issues. We have had to do a complete seperate accomodation that’s not accessible, through the house, but easily accessible…