Cost of accessory dwelling unit — Knoxville, TN

Looking for cost of 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

The total investment for an ADU depends on several moving parts, including your property’s site conditions, the complexity of your site plan, and the high-end finishes you select. Whether you are building a detached cottage or converting a garage, costs vary based on utility connections and local labor rates. Exact pricing confirmed free on the call.

Frequently asked in Knoxville

What are the disadvantages of ADUs?

Potential disadvantages include increased utility bills and possible impacts on property taxes. You might also face challenges with ongoing property management if you plan to rent out the unit. However, many of these concerns can be addressed with smart design and professional guidance.

How much does an ADU cost in Tennessee?

The cost of an ADU in Tennessee, including Knoxville, depends heavily on the specifics of your project. Factors like square footage, chosen materials, foundation type, and site accessibility all play a role. Expect a wide range, and the best way to get an accurate figure is to get a personalized quote.

What are the rules for ADUs in Tennessee?

Tennessee has varying regulations for ADUs at the state and local levels. In Knoxville, you'll need to check zoning ordinances for setbacks, lot coverage, and parking requirements. Understanding these local rules upfront is crucial for a smooth permitting process.

Is an ADU allowed in my Knoxville neighborhood?

Most residential zones in Knoxville allow for ADUs, but specific rules apply regarding size, placement, and lot size. It's essential to confirm your property's zoning and any neighborhood-specific covenants that might affect your project. The pros can help clarify this.

What goes into the cost of an ADU?

The total cost encompasses design and planning, permits, site preparation (like excavation and foundation), construction materials, labor for framing, roofing, plumbing, electrical, and finishing touches. Utility hookups and landscaping can also add to the final price.

How do I get started with an ADU project in Knoxville?

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

All cities in Tennessee →

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, West Knoxville, North Knoxville, South Knoxville, East Knoxville — and every surrounding area.