Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Knoxville, TN? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Knoxville 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 custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Determining the cost requires looking at site preparation, foundation work, and the level of interior finishing you choose. Costs change based on whether you opt for a pre-designed layout or custom architecture. You should research these costs when you are ready to evaluate the financial return of your property upgrade. Exact pricing confirmed free on the call.

Frequently asked in Knoxville

What are the disadvantages of ADUs in Knoxville?

How much does an ADU cost in Tennessee?

What are the rules for ADUs in Tennessee?

Tennessee has state-level guidelines, but local Knoxville ordinances are key. These often cover setbacks, lot coverage, and parking requirements. Understanding these rules is crucial before you begin. A call can help clarify what applies to your specific Knoxville address.

Is an ADU allowed in my Knoxville neighborhood?

Can I get a grant for an ADU in Tennessee?

While there isn't a widespread state grant like some other states, specific local incentives or programs could emerge. It's always worth asking about potential funding options when you call. We focus on providing accurate quotes for your project.

What is the cost to build an accessory dwelling unit in Knoxville?

Also serving nearby: Asheville · Chattanooga · Murfreesboro · Roswell · Sandy Springs

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

Service area details

198,162residents

2,007per sq mile

8ZIP codes served

Serving all of Knoxville — population 198,162; about 2,007 residents per square mile across 98.7 sq mi. ZIP codes covered include 37901, 37902, 37909, 37912, 37914, 37915, 37916, 37917.

Neighborhoods served in Knoxville: Downtown Knoxville, Old City, Bearden, West Knoxville, South Knoxville, North Knoxville — and every surrounding area.