ADU Construction
San Francisco Bay Area
Accessory Dwelling Units — Permitted & Built
How We Handle ADU Construction — and Why It Matters
Describe your adu construction project and we'll come out, assess the scope, and give you a fixed price. No obligation.
Book a Site Visit (415) 770-4977Why IronNest
What Separates Good ADU Construction from Bad
Full ADU feasibility review before you commit to any design
Permit management — design, plans, plan check, and inspections
Detached, attached, garage conversion, and JADU options
California ADU law expertise — we know what cities can and cannot require
Rental income potential: Bay Area ADUs rent for $2,500–$4,000/month
How It Works
Our ADU Construction Process
Feasibility Review
We assess your lot, setbacks, existing structure, utility connections, and zoning rules. We tell you what's buildable before you spend money on design.
Design & Plans
We develop construction documents for permit submittal. Floor plan, elevations, sections, and all required engineering.
Permit Submittal & Approval
We submit to the building department, manage plan check comments, and obtain approved permits. This typically takes 4–12 weeks depending on jurisdiction.
Construction
Foundation, framing, MEP rough-in, insulation, drywall, finish. We coordinate all trades and keep you updated weekly.
Final Inspection & Handoff
City final inspection, utility connections, and punch list completion. You get the keys to a fully permitted, livable unit.
Ready to Start Your ADU Construction Project?
Tell us about your project. We come out, take a look, and give you a written price before anything starts — no ballpark estimates, no surprises mid-job.
Common Questions
ADU Construction FAQ
From first meeting to move-in typically runs 8–14 months — about 3–5 months for design and permits, plus 4–6 months for construction.
In San Francisco and close-in Bay Area cities, detached ADUs typically rent for $2,800–$4,500/month. Garage conversions typically run $2,200–$3,200/month.
California law allows detached ADUs up to 1,200 sq ft on most lots, and JADUs up to 500 sq ft within existing space. Local setback rules apply.
As of January 2025, California has removed owner-occupancy requirements for ADUs. You can rent both the main home and the ADU simultaneously.
A garage conversion typically runs $120,000–$220,000. A detached ADU runs $180,000–$400,000 depending on size and finishes.
"Finished on the exact date they promised, kept the site clean every single day, and the work passed City inspection first visit. I've hired two contractors before — the difference is night and day."
"14 weeks start to finish on our backyard ADU. They pulled every permit, coordinated every trade, and handled every inspection. We had a paying tenant 30 days after the final walkthrough."
"They actually restored the wood instead of covering it up. Matched the original trim profiles, fixed the rot sections properly. They treated the house like it mattered — because to us, it does."
Service Area
ADU Construction Across the Bay Area & Sacramento
We serve homeowners and businesses throughout San Francisco, the Bay Area, and Sacramento. Our own licensed crews — no subcontract guesswork.
Get a Free ADU Construction Estimate
Licensed, insured, and locally trusted. We'll assess your project and give you a clear, honest quote — no surprises.
- ✓ CSLB Licensed (#1130134)
- ✓ Fully bonded and insured
- ✓ Written quotes, transparent pricing
- ✓ 15+ years serving the Bay Area & Sacramento