Ontario ADU Contractor — Licensed ADU Builder Near You
Ontario's booming logistics sector, Ontario International Airport, and affordable housing create very high ADU demand. The city offers some of the best value for ADU investment in the Inland Empire.
A Top-Ranked ADU Contractor Serving Ontario, Inland Empire
Vision ADU ranks in the top 2% of all licensed contractors in California, as independently scored by BuildZoom — and we hold that same standard on every ADU we build in Ontario, Inland Empire. We are fully licensed (CSLB #1115842), 5.0-star rated on Google, with 30+ years of construction experience.
Looking for an ADU contractor near you in Ontario?
Vision ADU is a fully licensed Ontario ADU contractor and ADU builder serving every neighborhood in Ontario, Inland Empire. Whether you're searching for a "Ontario ADU builder near me", a garage-conversion contractor, or a new-construction ADU specialist, we handle the entire project end-to-end — design, permits, construction, and final inspection. CSLB License #1115842; our team has helped hundreds of homeowners across Southern California.
Vision ADU LLC · 1440 S State College Blvd, 6H, Anaheim, CA 92806 · (866) 668-4264 · Open Mon–Fri 8am–6pm, Sat 9am–5pm · 5.0-star rated on Google
Building an ADU in Ontario
Ontario's economy is powered by its international airport and a booming logistics sector, which keeps rental demand high and steady. Affordable lots and many established neighborhoods with room to build make it one of the better-value ADU markets in the region. The city processes ADUs under state timelines. Vision ADU designs units that fit Ontario's lots and the local rental market.
Why Hire a Ontario ADU Contractor?
Key advantages for Ontario homeowners
- Ontario International Airport drives employment and rental demand
- Booming logistics and warehouse sector nearby
- Affordable property prices for excellent ROI
- Very high housing demand with growing population
- Large lots in many established neighborhoods
Our ADU Services in Ontario
Garage Conversion ADU in Ontario
Transform your existing garage into a fully permitted ADU. Most affordable option with the fastest completion times.
New Construction ADU in Ontario
Build a brand-new detached ADU from the ground up. Maximize space and customize every detail.
Junior ADU (JADU) in Ontario
Convert part of your existing home into a separate living unit up to 500 sq ft.
Home Remodeling in Ontario
Full-service home renovation and remodeling to complement your ADU project.
Ontario ADU Permits
Ontario reviews ADU applications ministerially under California state law, which means no neighborhood hearing is required and the city must approve or deny a complete application within 60 days. The city follows state standards, including detached ADUs up to 1,200 square feet and no added parking for units within a half mile of transit, and under AB 670 an HOA cannot prohibit an ADU. Vision ADU handles the full submittal, plan check, and inspections. Permit and impact fees vary by city and project, so we provide a written estimate before you commit (an estimate only, not a guarantee).
ADU Regulations in Ontario
Overview of ADU zoning rules in Ontario based on California state law and local ordinances — setbacks, size limits, height, parking, and more.
As of August 2026. Source: California HCD ADU Handbook (March 2026) & 2025–26 state legislation (SB 543, SB 1211, AB 976, AB 1154, AB 462, AB 1033, AB 2533). California state law sets the minimum floor — local jurisdictions in Ontario may add design, setback, or other requirements on top of these state standards. Always verify current rules with your city or county planning department before building. Get a free consultation →
Neighborhoods We Serve in Ontario
Vision ADU builds ADUs across all Ontario neighborhoods
Frequently Asked Questions About ADUs in Ontario
Why build an ADU in Ontario?
Ontario's booming economy, growing population, and affordable property prices create ideal ADU conditions. strong rental income with low construction costs means excellent ROI.
How much does an ADU cost in Ontario?
Ontario offers very competitive ADU costs: both garage conversions and new construction are competitively priced.
What's the housing demand like in Ontario?
Ontario has very high housing demand driven by airport employment, logistics growth, and families seeking affordable Inland Empire housing.
How long does ADU permitting take in Ontario?
Ontario reviews ADUs ministerially and must act on a complete application within 60 days under state law. Vision ADU prepares the plans and manages all city corrections.
Ready to Build Your ADU in Ontario?
Get a free, no-obligation consultation with our ADU experts. We handle everything from design to permits to construction.
Book Free Consultation (866) 668-4264