Accessory dwelling unit cost — Knoxville, TN

Looking for accessory dwelling unit cost 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 cost for an ADU depends on whether you are building a new detached structure, converting an existing garage, or adding an attached unit. Factors like plumbing installation, electrical panel upgrades, and custom interior finishes drive the final investment. Understanding these variables early helps you determine the feasibility of your project. Exact pricing confirmed free on the call.

Frequently asked in Knoxville

What are the disadvantages of ADUs in Knoxville?

Potential disadvantages include upfront construction costs and the time it takes to get permits. You'll also want to consider how an ADU might impact your property's existing yard space. However, the benefits of increased property value and rental income often outweigh these factors for Knoxville homeowners.

How much does an ADU cost in Tennessee?

What are the rules for ADUs in Tennessee?

Tennessee's ADU regulations can vary by municipality, so local zoning ordinances in Knoxville are key. Generally, ADUs must meet setback requirements and may have limits on size and height. Understanding these local rules is crucial before starting your build.

Is an ADU allowed in Tennessee?

Yes, ADUs are generally allowed in Tennessee, but specific regulations apply at the city and county level. Knoxville, for example, has its own zoning laws that dictate where and how you can build an ADU. It's essential to check with your local planning department.

Can I get a quote for an ADU 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, Old City, Bearden, West Knoxville, South Knoxville, North Knoxville — and every surrounding area.