Asked by R at 9:33pm on Aug 10 2019
That sounds like a repair and something that is unlikely to need a permit, BUT it's hard to answer without knowing the scope of the work. It could also vary if you are in a historic district.
Please check out this checklist to help decide:
If you still have questions, you can contact BSEED-- their info is here: https://detroitmi.gov/departments/buildings-safety-engineering-and-environmental-department
If you are in a historic district, check with the guidelines here: https://detroitmi.gov/departments/planning-and-development-department/zoning-innovation-and-historic-preservation/historic-district-commission-information/making-exterior-changes-within
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