Real California costs, the permit reality, the state protections that expand what you can build, and what the contractor bid leaves out.
Most homeowners research ADUs for weeks, then sit down with the first contractor and get quoted on the concrete and the framing, not the city fees, the utility connections, the panel upgrade, or the months of plan check that quietly add tens of thousands and push the finish past a year. The bid looks complete. It isn't.
This guide is the insider read: what each ADU type really costs all-in, the permit path and the realistic timeline, the state laws working in your favor, and the exact line items the bid leaves out. So you walk into that meeting already knowing the number, and the questions that protect it.
$39 against a $150,000 to $400,000 project. One line item this guide catches pays for it many times over.
Know your ADU type. The six paths and what each really costs.
What it really costs. Where the money goes and the all-in number.
State protections and fees. Size floors, exemptions, and property tax.
Zoning and setbacks. What the state guarantees on your lot.
SB9. More than a lot split, and the path to more units.
The panel upgrade question. The hidden schedule risk.
Short-term rental rules. What your city actually allows.
The road map. From first call to Certificate of Occupancy.
The permit process. Plan check and the realistic timeline.
What's not in the bid. The fees and surprises to budget for.
Choosing your contractor. Plus the questions to ask before you sign.
Financing your ADU. Options and the monthly cash-flow math.
ADU, kitchen, bathroom, and full remodel, together for one discounted price. One project has a way of leading to the next.
The guide makes you the most prepared person in the room. When you want a straight read on your specific ADU or your actual bids, these are the next step.
Bring your lot, your bids, and your timeline and get a live, unbiased read on what is realistic and what to ask next.
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Skip the cold-calling. Meet up to three vetted contractors for your ADU, compare proposals, and choose.
Start your match →Yes. It reflects the current statewide size floors, setback rules, fee exemptions, and short-term-rental restrictions, written for California homeowners with a focus on Southern California.
Yes. It breaks down every ADU type by cost, timeline, and permit path, so you can compare them before you commit.
No. It gives real ranges plus the method to pressure-test any bid. It is advisory, not an estimate.
Instant PDF download right after checkout. Yours to keep and re-read whenever you need it.
Read it before your next contractor meeting. One decision it helps you make can save you far more than the guide.