Detached 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
A detached ADU is a standalone building separate from your main home, like a backyard cottage. These provide the most privacy for you or your tenants since there are no shared walls. You need this if you have a large enough yard to accommodate a separate structure.
Frequently asked in Columbia
What is the cost to build an accessory dwelling unit in Columbia?
What does 'accessory dwelling unit' mean in Columbia?
How do I find accessory dwelling unit builders in Columbia?
What are the permit costs for an accessory dwelling unit in Missouri?
What are the advantages of a prefabricated accessory dwelling unit?
What are the best accessory dwelling unit options for my property?
What does 'accessory dwelling unit homes' refer to?
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 Loop, Downtown Columbia, South Columbia, West Columbia, Hallsville, Centralia — and every surrounding area.
Areas we serve
Browse by state, then city.