ADU design ideas, every one of them already built in Orange County.

Avorino works on fixed-price design-build contracts that include architectural plans, structural engineering, Title 24 energy calculations, city permits and plan-check, and construction, so the range reflects a turnkey project, not just the build. The design sits inside the published band for the type, typically $245K – $440K+ for a detached ADU, rather than beside it. We publish no separate design fee.

Yes. We built a two-story detached ADU in the Santa Ana Hills: a stacked floor plan on a compact footprint, structural engineering for the second story, a full kitchen and living level, and bedrooms above. The payoff is nearly double the rentable square footage on the same lot coverage. The state height limits that govern a two-story unit are set out section by section on our detached ADU page.

Yes, that is what they are for. Bellecielo (830 SQFT), Casielo (387 SQFT), Elega (500 SQFT) are fully buildable ADU floor plans with photoreal renderings of every room, and our in-house design team adapts every plan to your vision, finishes and budget.

In Brea we turned an under-used two-car garage into a bright, open-plan studio-style unit with a full kitchen and open living, insulation, drywall and egress brought to habitable code, electrical panel work with dedicated circuits, and an exterior door and window package. Typically $85K – $170K+ over 4–6+ mo.

The review path is ministerial either way. A permit application for an ADU is considered and approved ministerially, without discretionary review or a hearing, and the permitting agency must approve or deny a completed application within 60 days of receiving it; if it has not done either by then, the application is deemed approved (Gov. Code section 66317(a)(1) and (a)(3)). The clock starts once the application is complete, so each correction round delays when that clock begins.

Detached ADUs typically run $245K – $440K+ at 500 – 1,200 sqft over 5–8+ mo. An attached ADU typically runs $200K – $350K+ at 450 – 1,000 sqft, a garage conversion typically runs $85K – $170K+ at 350 – 600 sqft over 4–6+ mo, and a Junior ADU typically runs $135K – $220K+ at 300 – 500 sqft.