Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Knoxville, TN? Call AccessoryDwellingUnit Experts 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 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 Knoxville

What are the disadvantages of ADUs in Knoxville?

Potential downsides include increased utility costs for your main home and the complexities of local permitting. You'll also want to consider how an ADU might impact your property taxes. The pros can help you weigh these factors for your specific Knoxville property.

How much does an ADU cost in Tennessee?

What are the rules for ADUs in Knoxville?

Knoxville has specific regulations regarding lot size, setbacks, and unit size for ADUs. It's crucial to ensure your project complies with city ordinances. The specialists you'll speak with are knowledgeable about these local requirements.

Can I build an ADU on my property in Knoxville?

Generally, yes, if your property meets the city's zoning requirements for lot size and density. The pros can assess your specific lot to confirm eligibility. They'll guide you through the initial feasibility checks.

What permits are needed for an ADU in Knoxville?

You'll likely need building permits, zoning permits, and possibly utility connection approvals. The process can seem daunting, but the experts can explain what's required. They help streamline this part of your Knoxville ADU project.

What affects ADU construction costs 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 Hills, South Knoxville, North Knoxville — and every surrounding area.