If the "owner" is doing the work at your house, then they are the worker, and I wouldn't tip them less because of it.
At any time, service is tough. Whether or not they expect it, some people tip, and some won't. Who will get better service? It's one thing as an anonymous, maybe one-time transaction at a restaurant. (For most people) But these people know you, and you know them. I have generally found generous tipping to come back to me in better service / less hassle / benefit of the doubt / priority / favors many times over, in terms of value. Also, the best people can generally pick their customers. Better to secure that relationship than to be told they are "cutting back," or get referrals from the good people for others they respect.
And then...these people have come into extended contact with others, during Covid. Probably because they had to, not just because they are nonchalant about catching it. They may be worried for their family, too.
So yeah, if you are privileged enough to be able to, tip well. This season, even more so.
Even silly fast food or quick casual restaurants, where I usually would not only not add a tip, but wonder at the gall of asking for a tip for no service, I have been adding it. I'm doing fine, and that is not the case, particularly in service industries.
One service, or one period of service, is a good idea. As much as tipping itself, I think the expected or appropriate amount is very local.