A licensed father-and-sons crew that builds ADUs across the Inland Empire. We handle design, Ontario permits, and construction — starting with a free, honest walk-through of your lot.
Permits approved in ≤60 days by CA law · Impact fees waived under 750 sq ft · Se habla español
Tell us where you are — we'll walk your lot and give you a straight answer, even if it's "don't build."
Prefer to talk? Call or text (909) 208-8655
Ontario applies the statewide ADU rules — impact fees waived under 750 sq ft and a 60-day approval deadline — with city permit fees typically $2,500–$5,000.
Ontario 1-bedroom ADUs rent for $1,700–$2,100/month, with strong demand from Ontario International Airport and logistics-corridor workers.
Ontario's pre-1970 tracts around downtown and south of the 60 were built with detached garages and alley access — the easiest garage conversions in the IE. Newer Ontario Ranch lots favor detached units.
| Project type | Typical investment | Timeline |
|---|---|---|
| Garage Conversion ADU | $90,000 – $150,000 | 3–5 months |
| Attached ADU | $150,000 – $250,000 | 6–10 months |
| Detached ADU (new build) | $180,000 – $280,000 | 9–14 months |
Full cost breakdown, permit timeline, financing options, and FAQ on our main ADU page →
Free feasibility walk-through — a straight answer, even if it's "don't build."
Also building ADUs in: Fontana · Rancho Cucamonga · Rialto · Riverside
