Start with the correct local department
Confirm which jurisdiction reviews your property before using a checklist from another Orange County city. For an Irvine property, begin with the City of Irvine ADU project page. It lists a Residential ADU application, an ADU Verification Form and project documents, with submissions through IrvineReady. Confirm the current requirements directly with the city.
Does a pre-approved plan mean my ADU is approved?
No. Irvine’s standard plan program still calls for a permit application and site-specific review. When checked on October 10, 2026, its listed standard plans were marked “Coming soon.” Ask the city about current availability. Do not treat our illustrative website designs as city-approved plans.
Prepare two separate conversations
| Financing conversation | Project-provider conversation |
|---|---|
| What amount, repayment terms, fees and access timing could a lender offer? | What scope, site work, documents and approvals would this property need? |
| Would a HELOC add an obligation alongside my existing mortgage? | What is included in the prefab quote, and who prices the exclusions? |
| What happens if the required budget exceeds available financing? | What milestones must happen before delivery and installation? |
A practical planning sequence
- Write down your intended use, approximate timing and property ZIP code.
- Ask the appropriate provider for a property-specific scope and responsibility list.
- Use our prefab budget checklist to identify costs outside the unit price.
- Ask the lender to explain repayment and access to funds in writing.
- Resolve gaps between budget, available funds and provider payment milestones before making commitments.
Outside Irvine?
Use the planning and building department responsible for your property. Irvine’s forms and program do not establish the process for every Orange County city. The California HCD handbook provides a statewide starting point.
Explore your next step with ADU Fund Co
We are based in Irvine and begin with initial inquiries about financing and prefab options. We do not perform city review, permitting or installation. Tell us about your plans; a representative will reach out within 24 hours.
Sources & scope
- City of Irvine: ADU project requirements
- City of Irvine: standard plan program
- California HCD: ADU handbook
Sources checked October 10, 2026. General educational information, not an individual financing recommendation. Loan terms and approval are determined by the lender. ADU Fund Co helps with initial inquiries and next steps.