How much does a adu / guest house cost?

The average adu / guest house costs between $70,000 and $260,000 for a typical 500 sq ft project. Costs vary by region, materials, and contractor.

What factors affect adu / guest house costs?

The main factors that affect adu / guest house 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 adu / guest house?

To get the best price on a adu / guest house, 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.

ADU / Guest House Cost — How Much Does It Cost?

National Average Cost

$70,000 – $260,000

For a typical 500 sq ft adu / guest house. Enter your details for a precise local estimate.

Cost by Region

Region	Low	Mid	High
Northeast	$90,000	$140,000	$210,000
Southeast	$70,000	$110,000	$170,000
Midwest	$75,000	$117,500	$180,000
Southwest	$80,000	$125,000	$195,000
West	$105,000	$165,000	$260,000

Based on a 500 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%.