The cost of building an accessory dwelling unit (ADU) can vary based on several factors, including:
Size: The size of the ADU is a primary factor in determining the cost. Larger units require more materials and labor, resulting in higher costs but lower square footage price. Smaller units require similar base construction costs but overall are faster and more economical.
Design: The design of the ADU, including its style and complexity, can affect the cost. More intricate designs may require additional labor and materials, increasing the cost. Multi-level buildings are more expensive due to increased structural requirements.
Materials: The type and quality of materials used in the construction of the ADU can affect the cost. High-end materials may be more expensive than standard materials, resulting in a higher cost. Builder grade materials used for a rental or investment property are good quality and keep the budget down.
Location: The location of the property can also affect the cost. Factors such as accessibility, availability of utilities, and local building codes and regulations can impact the cost of construction.
Labor Costs: Labor costs can vary based on the contractor or construction company you choose to work with, as well as the complexity of the construction project.
Permits and Fees: Permitting fees, impact fees, and other associated fees greatly affect the cost of building an ADU. Design/Architecture costs range from $6000-$25,000. Permit costs range from $9,000-$30,000.
It's important to consult with a licensed contractor of ADU's to determine the specific costs associated with building an ADU on your property, as pricing can vary significantly based on individual circumstances.
Examples of past ADU projects.
Single Story attached ADU 380 SF (new construction):
$185,000 - $486 per S.F.
Single Story detached ADU 500 SF (new construction)
$223,000 - $484 per S.F.
Two Story detached Duplex ADU 1680 SF (new construction)
$595,000 - $354 per S.F.
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