Six independent data sources. Eight disqualifying screens. Run before a contractor's name reaches you.
How ADUscale Verifies California ADU Contractors — The 6-Source Framework
Most California homeowners pick an ADU contractor through three quotes, a referral, and gut feel. That worked when the ADU market was small. It doesn't work in 2026. California's ADU permit volume grew from roughly 540 in 2016 to over 25,000 in 2022 — a 46x expansion in six years. Contractor failure has gone mainstream. Anchored Tiny Homes (Roseville) and Multitaskr Construction (Chula Vista) abandoned a combined 550+ projects in 2024. Lead marketplaces sell homeowner contact data to whoever bids highest. ADUscale runs every contractor through six independent data sources before their name reaches a homeowner — and the same framework is how we find the top builders worth expanding capacity for in the first place. Sometimes, after verification, the cleanest move is to wait, change scope, or not to build at all on this lot. We say that clearly, before any money moves.
Top-1% contractor by pass-rate · Same price as going direct · Payments release only when inspections pass
The Contractors State License Board (CSLB) is California's licensing authority for construction. Every ADU contractor must hold an active B-General Building license, or a specialty license appropriate to scope.
License is active (not suspended, revoked, expired, or "license bond canceled")
License has been continuously active for at least 5 years
License classification matches the project scope (B-General Building for ADU new construction)
RMO/RME is consistent over time — frequent changes are a red flag
License bond is active at the $25K California baseline (pays at $25,000 maximum total for all claims combined, not per claim)
Note: A CSLB-licensed contractor is the legal floor, not the ceiling. Anchored Tiny Homes was CSLB-licensed when it collapsed.
Source 02
CSLB Disciplinary History
The CSLB maintains a public disciplinary action database going back years.
Zero CSLB disciplinary actions in the last 36 months
Any historical accusations, citations, suspensions, or revocations
Pattern of complaints (single isolated complaint vs. recurring pattern)
Resolution status (open complaint, dismissed, settled, action taken)
Source 03
California Superior Court Filings
California Superior Court records are public. We pull civil filings against the contractor and against the RMO/RME individually.
Mechanic's lien filings against past clients (signal: contractor failed to pay subs, subs sued client)
Breach-of-contract suits against the contractor
Stop-notice filings on past projects
Bankruptcy filings (Chapter 7, Chapter 11, Chapter 13) for the entity or its principals
A contractor with 5+ mechanic's lien filings in the past 3 years has a pattern of leaving subcontractors unpaid. The next homeowner is the next victim.
Source 04
Local Building Department Inspection Records
Every California city's building department maintains inspection-pass-rate data on permitted projects. LADBS, San Diego DSD, San Francisco DBI, San Jose Planning, Sacramento County Planning.
First-pass inspection success rate vs. county or city median
Number of corrections requested per inspection cycle
Final inspection sign-off rate vs. projects that never closed out
Source 05
InspectPilot 11M-Record Inspection Database
ADUscale's sister brand InspectPilot maintains an inspection-records database of 11 million records since 2013, covering most California metro areas. We use it directly for contractor verification.
Contractor's project history across multiple cities (catches contractors who burn one city's reputation and move to the next)
Project size distribution (signal: contractor over-extending)
This is also how we identify the top builders worth working with — first-time pass-rate and schedule reliability no one else can see.
Source 06
Independent Insurance + Bond Verification
We confirm directly with the carrier, not from a contractor-supplied certificate.
Active general liability insurance with $1M+ per occurrence and $2M+ aggregate
Active workers' compensation policy, or a valid sole-proprietor exemption
Active license bond at the $25K California baseline
Recent policy lapses or non-renewals (signal: insurer dropped them)
Insurance lapses correlate with financial distress, which correlates with mid-project failure.
Section 02
The 8 Disqualifying Screens
A contractor that fails any one of these screens does not enter the bid pool we present to a homeowner:
#ScreenDisqualifying condition
01CSLB licenseInactive, suspended, revoked, expired, or bond canceled
02License tenureLess than 5 years continuous active license
03Disciplinary history1+ CSLB action in last 36 months OR 3+ actions in last 5 years
04Court filings3+ mechanic's lien filings against past clients in last 3 years
05BankruptcyActive Chapter 7/11/13 within last 5 years
06Inspection recordFirst-pass inspection rate below city median for residential ADU
07InsuranceLapsed GL or workers' comp in last 12 months
08Common-name overlapSame RMO/RME or principals as a recently-collapsed firm
The eighth screen — common-name overlap — has been the most-used in 2024–2025. The Anchored Tiny Homes and Multitaskr collapses involved principals who, in earlier years, operated under different entity names. CSLB tracks license-by-license. We track person-by-person.
Get verified contractors scoped to your project
Start with the $199 Feasibility & Risk Assessment
It reads your specific lot, models the realistic cost band, and flags whether full six-source verification is worth running on contractors you've already met. About 1 in 7 reports recommends not to build on this lot — we say so in writing.
Verification reduces the probability of failure. It doesn't eliminate it. That's why we pair verification with Verified Milestone Payouts. Funds release only when inspections pass — on either the automated rail (default, included) or the optional licensed-escrow rail (DFPI-licensed). A failure mid-project doesn't take your money with it.
Limit 02
It doesn't measure soft factors
Communication style, design taste, neighborhood fit. These still require homeowner judgment after the verified pool is presented.
Limit 03
It isn't a marketplace
We don't sell access to your inquiry. We may surface 2–3 verified contractors for your project, get one of them the capacity to take you on, and stay on the build — we don't sell an introduction and walk away.
Section 04
How Verification Fits Into the Method
Verification is the second of four stages in the ADUscale Method:
Build — Project coordination from contract through final sign-off, in a customer portal with photo and video reports for every trade
You can hire ADUscale just for Verify. Some homeowners do — they want a vetted shortlist and then run the project themselves. Or you can build with us end-to-end, at the same price as going direct.
Section 05
Citable Factoids — Contractor Verification
$25,000CSLB bond max (total)All claims combined — not per claim
11M+Inspection recordsInspectPilot — since 2013, CA residential
8 screensDisqualifying filtersPer contractor, before homeowner sees their name
46xADU permit growthCA statewide 2016–2022 (CA YIMBY)
1 in 7Reports say don't buildFeasibility & Risk Assessment findings
Section 06
Frequently Asked Questions
You can, and you should. But CSLB only shows license status. It doesn't show court filings, inspection-pass-rate, insurance lapses, or common-name overlap with collapsed firms. The 6-source framework is what catches the patterns CSLB alone misses.
2–4 weeks per contractor for full 6-source verification. Faster (5–10 business days) if we're verifying a contractor you've already shortlisted. Slower if we're sourcing the verified pool from scratch.
Yes. Many homeowners arrive with a contractor they were referred to. We run the same 6-source verification on that contractor and tell you what comes back. If they pass, we say so. If they don't, we show you exactly what we found and let you decide.
We don't sell list placement. We're paid by the contractor we end up building with, out of the budget he already spends to find customers — ads, lead marketplaces, sales overhead. That's why your price is the same as going direct. Crucially, the verification gate runs the same way regardless: a contractor who fails a screen doesn't get in, and there's no version of the model where we'd profit from waving someone through.
It depends on what the action was, when it occurred, and the resolution. A 5-year-old citation that was resolved differs from an active 2024 suspension. We document our finding and let you make the call. The screens are defaults, not absolutes. We tell you when we're departing from the default.
Marketplaces sell your contact information to bidders and walk away. We don't sell your inquiry. Marketplaces apply minimal verification (license active = pass). We apply 8 disqualifying screens, get one of the best contractors the capacity to take your job, and stay on the build through final inspection.
Social-media presence is uncorrelated with construction quality. Verification doesn't care about Instagram followers. It cares about court filings, inspection records, insurance status, and license history. Some of the most-followed California ADU contractors in 2024 had the worst inspection records.
Yes. Homeowners receive the full written verification report on each shortlisted contractor as part of the Verify engagement. It includes screenshots from CSLB, court-filing summaries, inspection-record analysis, and our written interpretation.
With Verified Milestone Payouts, undisbursed funds stay in the rail you chose. The automated rail uses a controlled Stripe account (not regulated escrow). The optional licensed-escrow rail is held by a DFPI-licensed third-party agent. We don't hold your money on either rail. We help transition to a new contractor, manage the LADBS permit transfer, and coordinate lien release for any subs already on the project.
Yaro Korets, Founder of ADUscale
ADUscale is a California build-side ADU partner: we help homeowners secure one of the state's top contractors, expand that contractor's capacity to take the project, and protect the budget with inspection-gated milestone payments — at the same price as going direct. The verification framework is calibrated against CSLB enforcement records, California Superior Court filings, LADBS, San Diego DSD, SF DBI, and our own continuously-updated database of California construction (543,983 LA permits, 10.4M inspection records, 40,540 contractors, 28,608 ADU sites via sister brand InspectPilot, since 2013; cumulative 11M+ records). We are not a lender, mortgage broker, or financial advisor.
The 6-source framework is what stands between you and a contractor failure
Start with a free Reality Check. Build with confidence.
Run the free Reality Check to confirm your lot is buildable. If it clears, get the $199 Feasibility & Risk Assessment. If that confirms the project makes sense, build with us — we get you one of the best contractors and the capacity to take your job, run six-source verification, and protect the budget with Verified Milestone Payouts — at the same price as going direct. About 1 in 7 reports recommends a different lot, scope, or timing. We say it clearly, before any money moves.
