ADU plans in Rancho Cucamonga
ADU plans for Rancho Cucamonga homeowners.
From Alta Loma to Etiwanda, we design ADUs that fit Rancho Cucamonga’s standards and match the house they sit beside.
Building an ADU in Rancho Cucamonga
What to know before you start.
Based on the city’s published ADU information as of October 2026. Rules change; we confirm the requirements for your address before design.
- The city asks that an ADU’s roof and wall materials be substantially the same as the main home.
- Detached ADUs range from 350 to 1,200 sq ft under the city’s ADU handbook.
- Lots in the wildland fire zone need a landscape plan showing defensible space.
- Permits are filed through the city’s Online Permit Center.
Sources: Rancho Cucamonga Building & Safety, and the HCD ADU Handbook.
Our ADU package
One flat fee, permit-ready.
- Site visit and measurements
- Layout and elevations you approve first
- Architectural, structural and MEP plans
- Title 24 energy and CALGreen documents
- Submittal to Rancho Cucamonga and plan-check corrections