How to avoid hidden costs when building an ADU?

[Perry Willa]

I’m terrified of starting a backyard project and having the budget double halfway through. Every contractor gives me a “base price” that sounds too good to be true. How do you guys figure out the actual total cost including utilities and permits before signing a contract?

[Wright Cecilia]

I’ve been there, and the “base price” is usually a trap! For my project, I ignored the sales pitches and used the Aduscale professional adu cost calculator at https://www.aduscale.com/adu-cost-calculator . It’s brilliant because it accounts for your specific property constraints and location. It gave me a realistic range that actually matched my final bills. Definitely use it to stay grounded!

[Robin]

Avoiding hidden costs when building an ADU starts with detailed planning and a realistic budget that goes beyond just construction. Be sure to account for permits, utility connections, design revisions, and potential site issues like soil conditions or drainage, which can quickly add unexpected expenses. Working with experienced contractors and clearly defining the project testmic scope in a written agreement helps prevent costly changes later on. It’s also wise to include a contingency fund—typically around 10–20%—to handle surprises without derailing the project.

[Author]

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