Accessory dwelling unit services — St. Louis, MO
Last updated: September 24, 2026
What affects the price
Building an ADU involves variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.
About this service
Frequently asked in St. Louis
What is the accessory dwelling unit cost in St. Louis?
How do I get an ADU estimate for my St. Louis property?
Are there accessory dwelling unit grants in St. Louis?
What accessory dwelling unit companies are in St. Louis?
What is ADU housing in St. Louis?
What's involved in ADU building in St. Louis?
Are modular accessory dwelling units a good option in St. Louis?
Also serving nearby: O Fallon · Springfield · Columbia · Champaign · Peoria
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of St. Louis — population 281,754; about 4,565 residents per square mile across 61.7 sq mi.
Neighborhoods served in St. Louis: The Hill, Central West End, Soulard, Tower Grove South, Benton Park — and every surrounding area.
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