Garage Conversion ADU
in Chino, CA
The fastest, most cost-effective way to add rental income to your Chino property. Convert your existing garage into a fully permitted ADU — typically starting around $65,000–$70,000.
The fastest, most cost-effective way to add rental income to your Chino property. Convert your existing garage into a fully permitted ADU — typically starting around $65,000–$70,000.
Garage conversions save $40,000–$80,000 compared to building a new detached ADU because you're repurposing an existing structure with a slab, walls, and roof already in place. In Chino, most homes have 2- or 3-car garages where one or two bays sit largely unused. That underutilized space can generate $1,400–$2,000 per month in rent as a converted studio or 1-bedroom unit — often achieving payback in 5–7 years.
A garage conversion transforms your existing structure into a code-compliant residential unit with its own entrance, kitchen, bathroom, and living area. The key scope of work includes:
Attached garages share a wall with your main home and require a California-mandated 1-hour fire-rated separation assembly. This adds $3,000–$8,000 to the project but is standard practice and fully manageable. The advantage: utility connections are shorter and less expensive.
Detached garages have no fire separation requirement. The primary consideration is utility routing — you'll need to trench water, sewer, and electrical from the main house or street. Distance matters: every additional 10 feet of trenching adds $1,500–$3,000.
| Scope | Typical Cost | Timeline |
|---|---|---|
| 1-car garage (studio ADU) | $55,000–$85,000 | 5–7 months |
| 2-car garage (1-bedroom ADU) | $80,000–$120,000 | 5–8 months |
| 2-car, premium finishes | $110,000–$145,000 | 5–8 months |
| 3-car garage (2-bedroom ADU) | $130,000–$175,000 | 6–9 months |
All estimates include design, permits ($10,000–$20,000), all construction trades, and final inspection. Garage condition, utility distance, and finish level affect final cost.
Choose a garage conversion if: you want the fastest and most affordable path to rental income, you have a garage you're willing to repurpose, and your garage is positioned where tenants can access it independently.
Choose a detached ADU if: you want maximum rental income (typically $200–$400/month more than a studio garage conversion), you want the biggest property value boost, or you need to keep your garage for vehicles or storage.
We help every Chino homeowner think through this choice during the free consultation — pointing you toward whichever option actually serves your goals, not whichever earns us more.
California law prohibits cities from requiring replacement parking when converting a garage to an ADU, with limited exceptions. In Chino, replacement parking is generally not required for ADU conversions. We confirm the specific rules for your parcel during the consultation.
Ideal conversion candidates have: a structurally sound slab and walls, ceiling height of at least 7 feet (finished), reasonable proximity to utilities, a location that gives future residents adequate privacy and natural light, and a garage door opening that works as a wall with windows.
We assess all of these factors during the free on-site consultation. We'll tell you honestly if your garage is a good candidate — or if a different ADU approach would serve you better.