Asking questions about property

[Daelin Martins]

I’m trying to put together a offer currently but have question on some stuff like when was the last time the roof we replaced/repaired, what kind of plumbing, wiring, etc. are these due diligence question that should be asked after offer is made to the agent/realtor? Or is it just as acceptable to ask before offer is made.  Thank you ahead of time for anyone who answers/helps me out!