Need a home addition in St. Louis city, MO? St. Louis city has about 279,695 residents (2024 estimate) and 1 incorporated cities and towns. Describe your project once: addition contractors who work in St. Louis city get back to you.
Building permits in St. Louis city are issued by each city, or by the county in unincorporated areas.
Services available in St. Louis city
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Room addition
Ground-floor addition with foundation, framing, roof and finishes.
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Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in St. Louis city
Do addition contractors cover the whole of St. Louis city?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Home Additions in Missouri: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.