A buyer closed on a new townhouse in Dublin this spring. By summer, a stair-step crack ran up the garage wall, wide enough to slide a nickel into. A retired contractor across the street took one look and delivered the four words every new-home buyer dreads: call a lawyer. She did. Her lawyer told her she could not sue anyone yet. California had already scheduled her next nine months. Nine months of waiting rooms and certified mail before a judge would even learn her name.

That schedule has a name. In 2002, the Legislature surveyed the wreckage of residential construction-defect litigation, with its multi-year cases and insurance premiums that were quietly added to the price of every new front door, and built a mandatory waiting room. SB 800, the Right to Repair Act, codified at Civil Code sections 895 through 945.5, says a California homeowner generally cannot file a defect lawsuit without first handing the builder a formal notice and a structured chance to fix the problem. In 2018 the state Supreme Court confirmed the point: the Act is the exclusive remedy, and trying to plead around it with common-law claims does not work. McMillin Albany LLC v Superior Court sent homeowners who skipped the process back to the waiting room.

Nobody at the closing table reads you this part. Here it is, with the actual math.

Counting the 262 days

Day zero: you send written notice by certified mail, overnight courier, or personal delivery to the builder, describing the violation in reasonable detail, including where it is. A phone call to customer service does not count. An email to the sales office does not count. Section 910 says so explicitly, and adds that your notice carries the same force as commencing a legal proceeding, which is the statute's polite way of telling you this is already litigation in everything but the filing fee. No judge. No jury. Just mail.

Then the clockwork starts. Your builder gets 14 days to acknowledge the notice in writing. Fourteen. Fourteen more days to complete an initial inspection, at builder expense, after which it gets 40 days for a second round of testing if it puts the reasons in writing within three days. Thirty days after inspection to make a written repair offer, complete with a step-by-step scope statement, a completion date, and the names, license numbers, and insurance of the contractors doing the work. You get 30 days to accept the offer or demand a different contractor, and once you accept, repairs must start within 14 days and proceed with what the statute calls "the utmost diligence," with every effort made to finish within 120 days, which is where the entire back half of the 262 days lives, silently, while you keep paying the mortgage on a house with a cracked wall.

Add it up: 14 plus 14 plus 40 plus 30 plus 30 plus 14 plus 120. That is 262 days from the day you mail the notice to the day the statute expects the repair finished, assuming every participant uses every day the law allows and nobody requests mediation. Two hundred sixty-two days during which you cannot file suit, provided the builder keeps its appointments. Miss one of its deadlines and the deal flips: section 916(d) releases you to file immediately. There is a fire exit from the waiting room. Only the builder can open it, and only by failing to show up. Their absence is your permission slip. Use it.

One more number for the file. Section 941 bars actions more than ten years after substantial completion, a hard outer boundary with only narrow tolling while the repair process runs, so a homeowner who discovers defects in year nine enters the waiting room with almost no margin for a builder inclined to slow-walk it. The gauntlet is long, but it is not infinite.

Three days ago, a reform died

On August 31, at the session deadline, AB 1903 died without a final Assembly concurrence vote, despite passing the Senate 40 to 0 and the Assembly 70 to 0 in earlier form, forty to zero and seventy to zero, dead anyway. It would have required defect claimants to give builders more detailed descriptions and available evidence of alleged defects before litigating, and would have let both sides trade repair work for a release effective one year after completion. Consumer attorneys worried about weakening homeowner protections. Developers argued, with a UC Berkeley Terner Center study behind them, that defect-liability costs add $8,100 to $18,300 per condo unit and that liability insurance on condos runs three to four times the cost for comparable rentals.

Strip away the politics and notice what the dead bill wanted most: better evidence, earlier, detailed descriptions with available documentation, the paper trail lawmakers could not agree to require and technology is delivering anyway.

Enter the paper trail machines

This is where the AI part stops being a conference panel and starts being a litigation exhibit. Homeowners already hold a powerful tool most never use: section 916 gives the claimant the right to observe the builder's inspection and to video-record or photograph it. Twenty years ago that meant a camcorder and a prayer. Now it means a phone that timestamps every frame, measures the crack width against a known reference, and uploads the set to cloud storage before the builder's truck leaves the driveway, and that same phone can lay the builder's eventual repair offer alongside the photographic record to show, line by line and crack by crack, exactly what the proposed scope left out. Construction litigators at the American Bar Association have noticed: hardhat-mounted 360-degree cameras now auto-tag imagery to floor plans, creating location-stamped visual records that make "he said, she said" about site conditions an increasingly antique dispute.

Builders are arming up on the same battlefield. ECI's AvidWarranty, launched at the 2025 International Builders' Show, runs warranty triage on a dataset of 1.4 million homeowner claims, auto-prioritizing urgent repairs and drafting responses. Money explains the urgency: 27 major U.S. homebuilders paid $1.071 billion in warranty claims in 2024. When nine figures of claims flow through AI triage on one side, the homeowner who shows up to the section 916 inspection with a shoebox of blurry prints is bringing a strongly worded letter to a data fight.

None of this changes what the statute requires. An AI-drafted notice sent by regular mail to the sales office is still a defective notice, and section 910 cares about the delivery method, not the eloquence. What changes is the evidentiary asymmetry the dead bill tried to fix by fiat. A homeowner who can produce a dated, measured, location-tagged photographic record of every defect, mapped against the builder's own repair offer scope, negotiates the 262 days from a different position than one working from memory.

Now, the case against the machines

Now the part where the machines lose, because they do, regularly, and the statute does not care how impressive your software is.

Photographic evidence cuts both ways, and usually the builder's archive is bigger. A production builder that 360-scans every unit at drywall, at trim, and at final walk has a timestamped answer to most defect claims before the homeowner finishes the notice letter, which means the AI paper trail arms the defense first and best. An AI that drafts your section 910 notice is not your lawyer, and the most common way homeowners lose these claims has nothing to do with the merits: wrong recipient, wrong delivery method, missed ten-year deadline. Software that writes a beautiful notice to the wrong address has written you a beautiful defeat. Builders can also substitute their own contractual pre-litigation procedures if the purchase documents provide for them, which means the careful buyer reads the dispute-resolution exhibit in the purchase agreement before memorizing any section numbers, because the statute you studied on the internet may not be the procedure you actually signed at the closing table.

And the deepest skepticism is the simplest: there is no public count of how many section 910 notices get filed in California each year, nor any published average for how long the process actually takes. My 262-day figure is a statutory-maximum synthesis, every actor using every allotted day. Real cases resolve faster when builders cooperate, slower when they run through every allotted day, or sideways into mediation, and because nobody publishes the distribution of outcomes, every homeowner enters the process guessing at odds the industry could print but will not. An industry that will not measure its own waiting room should not be surprised when homeowners assume the worst about what happens inside it.

What we did not prove

This article's timeline is computed from statutory maximums, not observed cases; treat 262 days as the ceiling, not the norm. One more honesty note: the section 918 thirty-day homeowner response period is drawn from standard summaries of the statute rather than the code text quoted directly here. Warranty-claim dollars are national figures covering all warranty work, not SB 800 claims specifically. Vendor claims about AI warranty platforms are unaccompanied by independent audits. And nothing here is legal advice: defect claims turn on purchase documents, notice recipients, and deadlines that vary by case, so a construction-defect attorney earns the consultation fee.

If you are the homeowner

Find your builder's registered agent with the Secretary of State before you write anything. Send the section 910 notice by certified mail, describe each defect's nature and exact location, and start photographing immediately, with dates, measurements, and reference objects in frame. Calendar every statutory deadline from the mailing date: 14 days for acknowledgment, inspection windows after that, 30 days for the repair offer. When the builder inspects, exercise your section 916 right to record everything. If a deadline passes in silence, you hold the fire exit. And keep one eye on the ten-year clock in section 941, because the waiting room is long but the building is not open forever, and every month spent waiting on a builder who has already decided not to come is a month subtracted from the decade the statute gives you to get the paperwork right.