Review Zoning and Setbacks
2-4 hoursVerify local ADU rules, parking replacement, ceiling height minimums, and egress window requirements.
Field context
This workflow is part of 4 niche fields
Free step-by-step garage conversion for homeowners. Plan garage conversion with calculators and checklists covering review zoning and setbacks, plan.
Verify local ADU rules, parking replacement, ceiling height minimums, and egress window requirements.
Design stud walls, raised floor platform over slab, and R-value targets for walls and ceiling.
Calculate drywall, paint, flooring, and trim for converted living area.
Complete electrical, plumbing if added, insulation inspection, and certificate of occupancy path.
Estimate drywall sheets for new interior walls and ceiling.
Calculate paint for walls and ceiling after drywall finish.
Estimate vapor barrier and sleeper layout over existing slab.
Track conversion costs vs local ADU rental income potential.
Verify any step transitions from house to converted floor level.
Common IRC requirements for habitable garage conversions.
| Requirement | Typical Code | Action |
|---|---|---|
| Ceiling height | 7 ft 6 in min | Raise floor or modify roof |
| Egress | 5.7 sq ft window | Cut opening or add door |
| Fire separation | 1/2 in drywall min | Rate shared wall |
| HVAC | Heat to 68 F | Mini-split or extend system |
Slab moisture wicks into flooring — rigid foam and sealed plywood platform prevent mold.
Extending central HVAC into a garage often undersizes the main system; dedicated mini-split is cleaner.
Document wire and pipe locations for future remodels.