What the City Does Require
Chesterfield contracts permitting and inspection to the St. Louis County Department of Public Works, and the county issues the permits. The city gate comes first. Municipal Zoning Approval confirms the use is allowed and the structure sits inside the legal limits of the lot, and it is what authorizes the county to issue anything.
Standard review runs three to five business days with no fee. Decks, additions, pools, retaining walls, demolition, solar and a single-family basement finish all pass through it.