Home Addition Cost in Knoxville (2026): Average Price & Estimate

Home Addition Cost in Knoxville

Estimated home addition cost in Knoxville

$36,800–$110,400

Roughly about 8% below the national average.

Affordable labor keeps prices below average.

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Addition size (square feet)

Addition type

Finish level

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Based on Knoxville, TN pricing.

Estimated cost range

$36,800–$110,400

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An estimate for planning, not a quote. Get written quotes from local pros below.

Estimate, not a quote. Local prices vary by contractor and project. These are 2026 estimates for Knoxville, TN. Get written quotes from licensed Knoxville contractors before you budget.

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What to know about home addition in Knoxville

Wet soils and heavy rain in Knoxville stress foundations, so grading and drainage are part of a durable fix.

What affects home addition cost in Knoxville

Beyond the local market, the same factors that drive home addition cost everywhere apply in Knoxville:

Addition size in square feet.
Type: a bump-out is cheapest, a second-story addition the most expensive.
Whether it includes a kitchen or bathroom (plumbing).
Foundation, framing, roof, and tie-in to the existing structure.

Home Addition cost by addition type in Knoxville

These figures are adjusted for Knoxville pricing (about 0.92x the national average), so they reflect what local homeowners actually pay.

Estimated home addition cost by addition type in Knoxville (2026)

Addition type	Cost in Knoxville	Typical total
Bump-out (a few feet)	$73.60 to $221 /sq ft	About $29,400 to $88,300
Sunroom	$82.80 to $248 /sq ft	About $33,100 to $99,400
Single room addition	$92 to $276 /sq ft	About $36,800 to $110,400
In-law / suite with bath	$110 to $331 /sq ft	About $44,200 to $132,500
Second-story addition	$129 to $386 /sq ft	About $51,500 to $154,600

Frequently asked questions

How much does home addition cost in Knoxville?

In Knoxville, TN, home addition typically costs $36,800 to $110,400 in 2026 for a standard project, about 8% below the national average. Your exact price depends on size, materials, and scope.

Why does home addition cost more or less in Knoxville?

Affordable labor keeps prices below average. Labor rates, permit costs, and local demand are the main reasons Knoxville prices differ from the national average.

Do I need a permit for home addition in Knoxville?

Most home addition projects require a permit. Requirements vary by city and Tennessee jurisdiction, so confirm with your local building department. A licensed contractor usually pulls the permit for you.

When is the best time of year for home addition in Knoxville?

In Knoxville, aim for spring or fall. Summer heat, humidity, and afternoon storms can cause delays on exterior projects, and late summer is peak storm season.

Is home addition cheaper outside Knoxville?

Sometimes. Knoxville runs about 8% below the national average. Nearby smaller towns with lower labor costs can come in cheaper, while denser urban areas often cost more. Always compare quotes from contractors who serve your specific area.