Choose a Garage Conversion When
A garage conversion can make sense when the structure is sound, plumbing is nearby, you do not need the garage for parking or storage, and you want a lower-cost ADU path. It is often a practical first choice for compact rentals or family housing.
Choose a Detached ADU When
A detached backyard cottage makes sense when privacy, independent living quality, long-term rental appeal, and resale value matter more than lowest upfront cost. It also keeps the main home layout intact.
The Hidden Tradeoff
Garage conversions save money by reusing the shell, but they may create parking, storage, comfort, or code challenges. Detached cottages cost more because they are new construction, but they often create the cleanest long-term housing product.
Advisor Recommendation
Do not decide from a headline price. Compare both options against your lot, local rules, financing, and intended use. That is exactly what the quiz is designed to start.
Start with the ADU quiz. It captures your property type, goals, budget range, and readiness questions so the next step is focused. Take the ADU readiness quiz.