Cost to build accessory dwelling unit — St. Paul, MN

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 St. Paul

Also serving nearby: Minneapolis · Bloomington · Rochester · Duluth · Sioux Falls

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

Serving all of St. Paul — population 303,820; about 5,845 residents per square mile across 52.0 sq mi.

Neighborhoods served in St. Paul: Macalester-Groveland, Summit Hill, Highland Park, Cathedral Hill, West 7th — and every surrounding area.