How much does a home addition cost?

The average home addition costs between $39,000 and $126,000 for a typical 300 sq ft project. Costs vary by region, materials, and contractor.

What factors affect home addition costs?

The main factors that affect home addition costs are project size, geographic location (labor rates can vary 30–50% between regions), choice of materials, contractor experience, and season. Spring and summer are peak demand periods and can push prices up 10–15%.

How do I get the best price on a home addition?

To get the best price on a home addition, get at least 3 quotes from licensed local contractors, consider scheduling during the off-season (fall/winter), choose materials that balance quality and cost, and be flexible on start dates.

Home Addition Cost — How Much Does It Cost?

National Average Cost

$39,000 – $126,000

For a typical 300 sq ft home addition. Enter your details for a precise local estimate.

Cost by Region

Region	Low	Mid	High
Northeast	$52,500	$75,000	$114,000
Southeast	$39,000	$60,000	$93,000
Midwest	$42,000	$63,000	$97,500
Southwest	$42,000	$63,000	$97,500
West	$57,000	$84,000	$126,000

Based on a 300 sq ft project.

What Affects the Cost?

•Size: Larger projects cost more in total but often less per square foot due to economies of scale.
•Location: Labor rates in coastal cities can be 30–50% higher than rural Midwest markets.
•Materials: Economy vs. premium material choices can double the cost per square foot.
•Contractor experience: Licensed, experienced contractors charge more but typically deliver better results.
•Season: Spring and summer are peak demand, often pushing prices up 10–15%.