A man that recently started talking to me offered to build me a house for free (he's a contractor). He likes me but we're not dating. Should I accept?

I have some acres that I've been wanting to develop. I jokingly told him one day he should build me a house since he has a license etc. He accepted and even told my dad to tell me to accept.

A man that recently started talking to me offered to build me a house for free (he's a contractor). He likes me but we're not dating. Should I accept?
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