Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Salt Lake City, UT? Call AccessoryDwellingUnit Experts for a contact a provider — no obligation. Licensed adu builders serve Salt Lake City and the surrounding area, and you'll get straight answers on timing and what affects the price.

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

The cost to build an ADU varies based on whether you are converting an existing garage or building a new detached structure from the ground up. Factors like foundation work, utility extensions, high-end finishes, and site access all influence the final total. Exact pricing confirmed free on the call.

Frequently asked in Salt Lake City

What are the disadvantages of ADUs?

How much does an ADU cost in Utah?

ADU costs in Utah, including Salt Lake City, are highly variable, depending on size, design complexity, and material selections. Factors such as site preparation, foundation requirements, and interior finishes significantly influence the overall price. For an accurate estimate tailored to your property, consult with local construction professionals. They can provide a detailed quote.

What are the rules for ADUs in Salt Lake City?

Is an ADU allowed in Salt Lake City?

Yes, ADUs are permitted in Salt Lake City, with specific regulations in place to guide their development. The city has adopted ordinances that allow for these secondary units, provided they meet certain criteria. A local expert can confirm your property's eligibility and guide you through the necessary permitting steps. They'll ensure compliance.

While there might be other local or state incentives available in the Salt Lake City area, they can vary. It's recommended to research current opportunities. A construction professional can help explore any potential financial assistance.

What are the rules for ADU in California?

California's ADU laws are state-level mandates designed to promote ADU construction, but individual cities have their own local ordinances. These local rules often specify things like maximum ADU size and accessory dwelling unit placement. If you're interested in California, you'd need to research that city's specific regulations. For Salt Lake City, local Utah rules apply.

Also serving nearby: West Valley City · West Jordan · Sandy · Lehi · Orem

All cities in Utah →

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

Service area details

209,593residents

1,890per sq mile

8ZIP codes served

Serving all of Salt Lake City — population 209,593; about 1,890 residents per square mile across 110.9 sq mi. ZIP codes covered include 84101, 84102, 84103, 84104, 84105, 84106, 84107, 84108.

Neighborhoods served in Salt Lake City: The Avenues, Sugar House, Federal Heights, Capitol Hill, Emigration Canyon — and every surrounding area.