Here are the key steps involved in converting a garage into an ADU:

1. Check Local Zoning and Permits

Before starting the conversion, verify local zoning laws and regulations regarding ADUs. Many areas have specific requirements for size, height, and parking spaces. Obtain the necessary permits for construction, electrical, plumbing, and other work.

2. Assess the Garage Structure

Inspect the garage’s foundation, walls, roof, and overall structural integrity to ensure they can support the changes. Consider whether the garage needs reinforcement or upgrades to meet residential building codes.

3. Design the Layout

Plan the layout of the ADU. Decide on the number of rooms (e.g., kitchen, bathroom, bedroom) and how they will be arranged. Consider factors like natural light, ventilation, and privacy when designing the space.

4. Upgrade Electrical and Plumbing Systems

The garage may not have the necessary electrical wiring, plumbing, or insulation required for a livable space. Work with a licensed electrician and plumber to install or upgrade these systems to meet residential standards.

5. Insulate and Soundproof

Garages often lack sufficient insulation, which can make them cold in winter and hot in summer. Insulate walls, floors, and ceilings to improve energy efficiency. Consider soundproofing measures if the ADU will be used as a rental unit or if it’s close to the main house.

6. Install New Flooring and Walls

Install flooring suitable for a living area, such as hardwood, tile, or carpet. Drywall or other interior wall materials will need to be installed, replacing any unfinished or uninsulated garage walls.