Garage Conversion to ADU: Turning Your Garage into Living Space

If you've got a garage you mostly use for storage, converting it into an ADU is often the most practical way to add a rentable or livable unit — the structure is already there, so you skip the foundation and framing a detached unit needs. Here's what a garage conversion actually involves.

Why garage conversions are popular

• The shell already exists — walls, roof, and slab are in place, so it's usually faster and less involved than building new.
• It uses space you're probably underusing anyway.
• California and many Bay Area cities have made ADU permitting more straightforward, and garage conversions are a well-worn path.

What the conversion involves

• Making it livable — insulation, proper walls and ceiling, windows and egress, heating and ventilation.
• Utilities — running plumbing for a kitchen and bath, plus electrical to code for a dwelling.
• The slab and drainage — checking the existing floor and addressing moisture so the finished space stays dry.
• Finishes — flooring, kitchen, bath, and a proper entrance that makes it feel like a home, not a converted garage.

Is your garage a good candidate?

Most attached and detached garages work, but a few things matter: ceiling height, the condition of the slab and roof, how utilities reach it, and your lot's setbacks. We check all of that up front so we know it's viable before you commit. Where parking is a concern, we'll talk through how your city handles replacement parking for ADUs.

How we work

Genesis is a licensed general contractor (CA #1052900), 5-star rated, with 12+ years and 500+ projects across San Francisco, the Peninsula, and the South Bay. We handle the conversion end to end — feasibility, permits, and the build — with our own crew and a clear, itemized plan.

Thinking about converting your garage? Book a free, no-obligation consultation and we'll tell you straight whether it's a good candidate. Call (800) 950-3984 or reach us through our contact page.