11/05/2026
An office in a converted garage and a separate dwelling are different projects. Comparing their prices without comparing their scope can send your budget in the wrong direction.
Our September 2026 Austin guide puts a garage flex room without plumbing around $20,000–$40,000, a conversion with a bathroom around $40,000–$75,000, and a conversion into a legal dwelling around $80,000–$150,000 or more.
A detached ADU or casita is a small house, with its own foundation, envelope, kitchen, bathroom and utility connections. Many units with 500–800 conditioned square feet plan around $150,000–$350,000 or more.
Define the intended use, then confirm property-specific feasibility and the required scope. House Doctors of Austin evaluates these projects case by case. These are planning ranges, not quotes or a determination that a dwelling is permitted on your property.
Read the full House Doctors of Austin pricing guide: https://www.housedoctors.com/austin-tx/blog/austin/austin-remodeling-construction-costs/how-much-do-remodeling-and-home-additions-cost-i/