Painter Stole Key

[roibustea]

I just had an empty property painted and gave the painter a spare key. The painter completed the job and it looks lovely, but he took the key when he went. He said he'd drop it back today or tomorrow first thing, which I said is fine. But he's text this morning to ask whether I've paid. I am not inclined to pay until I get my key back, as once I've paid he has no motivation to return it, and I do need it to give to other people coming next week. And I obviously also don't really want this man to have full access to my house! Is it normal for tradespeople to hold keys hostage until you've paid? This seems really dodgy to me, is he planning to go into my house and do something if I don't pay?! Am I unreasonable to text back telling him I'll pay when I get my key?

No they don't. It's full payment on completion, or final payment on completion if there have been stage payments.
Many trades carry a card payment machine with them now because they get sick of not being paid in a timely manner

Another vote for arranging to meet with the key and either bring cash or pay him there and then.

If it's not too late don't get a ring doorbell, crooks can remove them from the door plus you pay a monthly fee. There are now cameras you please inside a window so can't be got at from the outside. Just do a lot of research before committing