Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Knoxville, TN? Call AccessoryDwellingUnit Solutions 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 involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

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When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.

Frequently asked in Knoxville

What are the disadvantages of ADUs in Knoxville?

Some disadvantages can include the upfront cost of construction and potential impacts on your property's yard space. You'll also need to consider local zoning laws in Knoxville, which dictate size and placement. However, these are often outweighed by the benefits of increased property value and rental income potential.

How much does an ADU cost in Tennessee?

What are the rules for ADUs in Knoxville?

Knoxville has specific zoning ordinances that govern ADUs, covering aspects like minimum lot size, setback requirements, and maximum dwelling unit size. It's essential to understand these regulations to ensure your project complies. Pros can walk you through the specifics for your chosen location within the city.

Is an ADU allowed in Tennessee?

Yes, accessory dwelling units are generally allowed in Tennessee, but local city and county regulations will apply. Knoxville has its own set of rules regarding ADUs, which can differ from surrounding areas. Consulting with local experts is crucial for compliance.

What are the rules for ADUs in Tennessee?

The rules for ADUs in Tennessee are primarily set at the local level by each city or county. This means zoning, permitting, and design standards can vary significantly. For Knoxville, understanding the city's specific ordinances is paramount for any ADU project.

While there may be other financing options or incentives in Knoxville, it's best to discuss your project's financial aspects directly with a pro who can offer relevant local advice.

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