A 2-car garage is roughly 400–480 square feet — exactly the size of a comfortable studio or one-bedroom ADU. That’s why garage conversions are the fastest-growing ADU type in California. Here are the layouts that actually work, what they cost, and the code requirements that shape every plan.
What Fits in a 2-Car Garage ADU
| Layout | Best for | Typical cost |
|---|---|---|
| Open studio + kitchenette + bath | Max rental appeal, simplest build | $95,000 – $130,000 |
| Junior 1-bedroom (partition wall) | Longer-term tenants, family | $110,000 – $145,000 |
| 1-bed + small office nook | Work-from-home renters | $120,000 – $160,000 |
The 5 Plan Decisions That Matter Most
- Where the bathroom goes: closest to existing sewer lines saves $5,000–$15,000 in trenching.
- Kitchen wall placement: along the shared wall with the house shortens utility runs.
- Where the garage door was: the opening becomes your glazing opportunity — French doors or a big window transforms light.
- Ceiling: vault it if the roof allows; it makes 420 sq ft feel like 600.
- Storage: a full-height wardrobe wall replaces the closet a garage never had.
California Code Requirements Your Plan Must Meet
- Ceiling height: 7’6″ minimum in living areas (7’0″ in kitchens/baths)
- Egress: bedroom windows must meet emergency escape sizing
- Insulation & Title 24 energy compliance (the garage slab and walls weren’t built for living)
- Fire separation from the main house where attached
- No replacement parking required in most California cities
Full process and timelines: our ADU permitting guide and garage conversion cost breakdown.
The Numbers That Make It Worth It
Converted 2-car garage ADUs in LA rent for $1,600–$2,100/month (rental data here) against a build cost that’s typically recovered in 5–7 years — while adding $150K+ to resale value.
FAQs
Do I need an architect for a garage ADU?
You need stamped plans — as a design-build firm we produce them in-house, which is faster and cheaper than hiring separately.
Can I keep part of the garage for storage?
Yes — a common hybrid keeps 6–8 feet of enclosed storage with the ADU in the remainder.
How long does it take?
Design + permits: 2–4 months. Construction: 10–16 weeks.
Want plans for your garage? RnD Builders Inc designs and builds garage ADUs across LA and Ventura County. Call (805) 367-1965 for a free feasibility check.
Garage ADUs designed and built in Los Angeles, Woodland Hills, Oxnard, Hawthorne, and Westchester.
Want professional help with this project? Our ADU design & construction services cover everything from design to final inspection — serving Oxnard, Simi Valley, and beyond. (805) 367-1965.
