An Accessory Dwelling Unit (ADU) is a secondary housing unit built on the same lot as a primary residence. Whether you're planning a basic, standard, or premium ADU, knowing the estimated cost in advance can help you make informed financial decisions. Our ADU Cost Calculator allows you to estimate the total cost based on:
- ADU Size (sqft)
- Construction Type (Basic, Standard, or Premium)
- Additional Features (Kitchen, Bathroom, and Heating/Cooling)
This blog will guide you through the calculation process, including the formula used in our calculator and an example calculation.
ADU Cost Calculation Formula
Step 1: Base Cost Calculation
The base cost is calculated based on the ADU size and the selected construction type:
Base Cost=ADU Size×Cost per Square Foot
The cost per square foot varies depending on the construction type:
- Basic Construction: $150 per sqft
- Standard Construction: $200 per sqft
- Premium Construction: $300 per sqft
Step 2: Adding Additional Features
If additional features are included, their respective costs are added:
Total Cost=Base Cost+Kitchen Cost+Bathroom Cost+Heating/Cooling Cost
The additional feature costs are:
- Kitchen: $10,000
- Bathroom: $5,000
- Heating/Cooling: $7,000
Example: Calculating the Total ADU Cost
Let’s calculate the total cost of building an ADU with the following specifications:
- Size: 600 square feet
- Construction Type: Standard ($200 per square foot)
- Additional Features: Kitchen, Bathroom, Heating/Cooling
Step 1: Calculate Base Cost
Base Cost=600×200=120,000
Step 2: Calculate Additional Feature Costs
- Kitchen: $10,000
- Bathroom: $5,000
- Heating/Cooling: $7,000
Feature Cost=10,000+5,000+7,000=22,000
Step 3: Calculate Total Cost
Total Cost=120,000+22,000=142,000
Conclusion
The total cost to build a 600 square foot ADU with standard construction, a kitchen, bathroom, and heating/cooling system would be $142,000. By using the ADU Cost Calculator, you can easily estimate the cost based on different sizes, construction types, and additional features, allowing you to plan your ADU project effectively.
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