Frequently Asked
How much does it cost to build an ADU in Austin?
Quick Answer
ADU construction costs in Austin in 2026 range from approximately $80,000 to $150,000 for garage conversions and $180,000 to $350,000 for detached ADUs built from scratch. Permitting and design fees add $10,000 to $30,000. Costs vary based on size, finish level, site conditions, and contractor. ADU construction costs more per square foot than standard residential construction due to the compact footprint and fixed project costs.
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