.jpg)
Questions? Call (833) 500-TRIO
Get My Free ADU Consultation
TrioTimber handles the entire ADU process across Greater Los Angeles and Orange County — architectural design, engineering, permit management, and full construction from groundbreaking to rental-ready delivery. We take care of every city's requirements so you don't have to.
Free consultation. No obligation. Response within 24 hours.
Every city in Greater LA and Orange County has its own permitting rules, setback requirements, and plan check timelines. Most general contractors file once and wait. We actively manage every step — because we've learned these systems across many jurisdictions.
Plans that don't account for city-specific setback rules, FAR limits, or utility easements get rejected — costing months and thousands in architect revisions. We design to code from day one.
Most homeowners don't know their project is stuck in “corrections pending” for months. We monitor your city's permit portal actively and respond to every correction within days.
A single missed line item — fire separation, egress window sizing, electrical panel upgrade — can fail your final inspection and delay your rental income by months.
Your contractor needs to know each city's plan check department, the reviewers, and how to escalate. We do — across every city in Greater LA and Orange County.
From the first feasibility call to the final certificate of occupancy — TrioTimber manages every touchpoint with your city's building department on your behalf.
We assess your lot's zoning, setbacks, FAR, and utility constraints before a single drawing is made — at no cost to you.
Our design team produces permit-ready construction documents that minimize plan check corrections in any jurisdiction.
We submit your application, track it in your city's permit portal, and respond to every correction within 2–3 business days.
We build to pass every interim and final inspection without remediation or reinspection fees.
We don't call the project done until the city stamps it done — and your unit is legally rentable.
| Monthly rental income range | $1,500–$2,500 |
| Annual gross rental income | $18,000–$30,000 |
| Estimated ADU build cost (studio) | $120,000+ |
| Estimated property value increase | $150,000–$300,000 |
| Gross ROI (5-year rental) | $90,000–$150,000+ |
* Estimates based on Greater LA & OC market data. Results vary by city, unit size, and finishes.
Across Greater Los Angeles and Orange County, an ADU typically adds $150,000–$300,000 to your property value while generating $1,500–$2,500 per month in rental income. With AB 68 and SB 9, California homeowners have more ADU flexibility than ever before.
Answer 5 quick questions and a TrioTimber ADU specialist will contact you within 24 hours with a free permit feasibility review.