Every window search in this market forks at the county line
A homeowner in the City of St. Louis and a homeowner in St. Louis County are not shopping the same way, and a single metro page serves neither of them.
The City of St. Louis is an independent city. It is legally separate from St. Louis County, with its own government and its own rules. Almost nowhere else in the country is arranged this way, and locals treat the two as different places. When a buyer says "the county line" they mean something real.
Search follows that split. A Soulard owner and a Kirkwood owner will use different words, expect different answers, and judge you on whether you sound like you have been to their address. A page that says "serving the greater St. Louis area" reads as an outsider on the first line.
Build the site to match. Separate coverage pages for the city and for the county, separate photo sets, separate proof. Where permitting and inspection practice come up, note that requirements generally differ by jurisdiction and that a homeowner should confirm with the local building department rather than take a contractor's word for it.
The cost of ignoring this is not abstract. One blended page competes for both sets of queries and usually finishes behind a dealer who committed to one.