Local Experts on Ontario ADU Zoning
Don't get stuck in permit hell. Find 15 builders builders who understand Ontario municipal codes and zoning setbacks.
15
Contractors
$2K
Average Rent /mo
$661K
Avg Home Value
Companies & Contractors serving close to Ontario
Top-rated professionals serving Ontario and neighboring areas in San Bernardino County
Hidden Peak Homes
Granny's Love Shack - Close to Hiking Trails, Fireplace, Deck, Barbecue
Granny's Love Shack by Big Bear Cool Cabins
Top Investment Neighborhoods
Highest rental yields in Ontario by ZIP Code
ZIP 91764
Highest Return
ZIP 91762
ZIP 91761
Top ZIP Codes by Rent in Ontario
Neighborhoods with the highest average rental rates
91764
91761
91762
Ontario Real Estate Market
Easy to understand market data to help you make informed ADU investment decisions.
Based on aggregated market data from multiple housing platforms and public records
Average Rent
Monthly rental price
$2K
Average Home Value
Property valuation
$661K
Market Analysis
Ontario shows strong rent growth of 1.5% over the past 12 months. Home values have changed by 2.3%, making ADU investment a strategic choice for homeowners.
Projected Property Value
Current market analysis for Ontario indicates a 0.9% increase in property values over the next 12 months.
Similar Cities to Ontario
Cities with similar market characteristics for comparison
California State ADU Standards
These are the guaranteed rights for homeowners in Ontario under California State Law. Local agencies cannot enforce stricter standards than these baselines.
State law prohibits local agencies from setting limits below 850 sq. ft. (1 bd) or 1,000 sq. ft. (2 bd). Generally, up to 1,200 sq. ft. is allowed subject to setbacks.
Local agencies cannot require rear or side setbacks of more than 4 feet.
Minimum allowed height limit. Some areas allow up to 18-25ft depending on proximity to transit or main house.
No parking required if ADU is within 1/2 mile of public transit, historic district, or part of existing home footprint.
State law currently prohibits owner-occupancy requirements for ADUs permitted between 2020 and 2025.
Development impact fees are waived for ADUs smaller than 750 sq. ft. For larger units, fees must be proportional.
* While these state laws provide a baseline, always verify specific local overlay zones or fire safety regulations with the Ontario planning department.
Building ADUs in Ontario
The rules for Accessory Dwelling Units in Ontario can be complex, involving setbacks, floor area ratios, and easement restrictions. Experience matters.
Our directory focuses on surfacing 15 builders local professionals who work within San Bernardino County regularly and understand how to navigate the local building department efficiently.
Frequently Asked Questions about ADUs in Ontario
Common questions from local homeowners
ADU construction costs in Ontario typically range from $250-$400 per square foot for standard construction. For a 500 sq ft unit, this translates to $125,000-$200,000. Garage conversions are usually more affordable, often costing 30-50% less than new detached construction.
ROI Intelligence
Investment insights for Ontario
Market Rent
$2K/mo
Est. Annual Income
$28K
Est. ROI
12.4%
Monthly Cash
$2K
Value Growth (12m)
-2.3%
*Estimates based on average ADU size (800 sqft) and construction costs ($200K). Actual results may vary. Use calculator for personalized analysis.