Short answer
Garage conversion cost depends on the existing slab, ceiling height, waterproofing, fire separation, utilities, bathroom scope, and whether the conversion is permitted as an ADU.
Cost drivers
What moves the number.
The existing garage is the question
Foundation, framing, moisture, ceiling height, and utility access decide whether the conversion is straightforward or painful.
ADU use adds code scope
Kitchen, bath, fire separation, insulation, energy, and parking rules can change the budget.
Permits matter
Unpermitted conversions are cheap until they collide with resale, insurance, safety, or city enforcement.
Planning ranges
Use ranges until scope is real.
| Line item | Planning range | Why it moves |
|---|---|---|
| Living space conversion | $85k-$180k+ | No full independent ADU kitchen or utility separation. |
| Garage ADU | $120k-$300k+ | Bathroom, kitchen, fire, energy, and utility complexity. |
| Soft costs | $9k-$45k+ | Drawings, engineering, permit review, and energy compliance. |
FAQ
Fast answers.
Is this a contractor bid?
No. It is a planning estimate that helps you understand the likely budget range before drawings, engineering, city review, and contractor pricing.
Why is the range wide?
Early construction budgets should be ranges because site conditions, structural scope, utility work, finishes, permits, and contractor availability can move the number fast.
Do I need to enter contact information?
No. The estimate appears first. Contact information is only for saving the estimate or asking for a local review.
