Enter the total square footage of the addition and the property’s value per square foot to determine the ADU cost.
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ADU Cost Formula
The following formula is used to calculate the cost of an ADU.
ADUc = A * PV * .85
- Where ADUc is the cost of the addition dwelling unit ($)
- A is the total square footage of the addition (ft^2)
- PV is the price per square foot value of the property ($/ft^2)
To calculate the ADU cost, multiply the area by the price per square foot, then multiply by .85.
What is an ADU Cost?
Definition:
An ADU cost is defined as the total cost to construct an accessory dwelling unit. These units are built on single-family lots but are separate from the main house.
The cost of these units is typically 85% of the per square foot value of the property.
For example, if the property had a value of $100 per square foot, then the ADU cost would be $85 per square foot.
How to calculate ADU cost?
Example Problem:
The following example problem outlines how to estimate the cost of an ADU.
First, determine the value of the property on a square foot basis. In this example, the property has a value of $500 /ft^2.
Next, determine the size of the ADU. This ADU will have a total size of 300 square feet (ft^2).
Finally, calculate the ADU cost using the formal above:
ADUc = A * PV * .85
ADUc = 300 * 500 * .85
ADUc = $127,500.00