Cost to build accessory dwelling unit — Columbia, MO
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
Building an ADU involves costs for permits, site prep, foundation, framing, plumbing, and electrical work. Prices fluctuate based on whether you choose a custom design or a pre-planned layout, as well as the complexity of connecting to existing city utilities. Exact pricing confirmed free on the call.
Frequently asked in Columbia
What ADU services are available in Columbia?
Are there affordable ADU options?
What is the process for an accessory dwelling unit permit?
Where can I find accessory dwelling unit builders near me?
What are the rules for detached accessory dwelling units?
How do I get an ADU estimate?
Are there accessory dwelling unit grants available?
Also serving nearby: O Fallon · Independence · Lee S Summit · St Louis · Kansas City
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Columbia — population 129,330; about 1,921 residents per square mile across 67.3 sq mi. ZIP codes covered include 65201, 65202, 65203, 65205, 65211, 65212, 65215, 65216.
Neighborhoods served in Columbia: The District, Stadium Village, Downtown Columbia, South Columbia, West Blvd Corridor — and every surrounding area.
Areas we serve
Browse by state, then city.