4 Best ADU Builders in St. Louis, Missouri
Verified ADU contractors and builders in St. Louis, MO
Showing 1–4 of 4 listings
Garage Living St. Louis
Transform your underutilized garage into functional living space with expert conversion services throughout the St. Louis area. Our specialized team handles every aspect of garage-to-living-space conversions, from structural modifications to finishing touches that maximize your home's usable square footage.
Garage Removal & Repairing
Transform your St. Louis garage into functional living space with expert conversion services tailored to your home's needs. From design to completion, we handle every aspect of converting garages into bedrooms, offices, studios, and more.
Garcia Construction
Transform your underutilized garage into functional living space with expert garage-to-living-space conversions throughout the St. Louis area. Our experienced team handles every aspect of your project, from design and permitting to construction and finishing, ensuring a seamless conversion that adds value to your home.
Mosby Building Arts
Mosby Building Arts does interior and exterior remodeling through a design-build process built on constant communication between firm and client. This ensures honest and accurate project costs and flexibility throughout the experience.
Frequently Asked Questions — ADU Builders in St. Louis
How much does it cost to hire an ADU builder in St. Louis?
ADU construction costs in St. Louis, Missouri vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in St. Louis to get accurate quotes for your specific project.
How long does it take to build an ADU in St. Louis?
In St. Louis, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Missouri local regulations. Prefab and modular ADUs often have faster timelines than site-built units.
Do I need a permit to build an ADU in St. Louis?
Yes, a building permit is required for ADU construction in St. Louis, Missouri. Your ADU builder will typically handle the permit application as part of their service. Missouri has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.
What types of ADUs can be built in St. Louis?
Common ADU types in St. Louis include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local St. Louis ADU builder can advise on what's allowed on your specific parcel.