You finish a $60,000 kitchen remodel, pay your contractor in full, and start picking out bar stools — then a letter arrives from a subcontractor you have never heard of, claiming $18,000 and threatening a mechanics lien on your home. Or flip the perspective: you are the contractor, the job went fine, but a homeowner files a Contractors State License Board complaint because your contract never said anyone else would be swinging a hammer on their property. Starting January 1, 2026, California has a new answer for both situations, and it lives on page one of your contract.
Senate Bill 517, chaptered October 10, 2025, amends Section 7159 of the Business and Professions Code — the statute that dictates what a California home improvement contract must contain. Every home improvement contract you sign now needs a yes-or-no checkbox stating whether a subcontractor will be used on the project, plus a statutory disclaimer when the answer is yes, repeated on every change order. Miss it, and you have handed the CSLB a discipline-ready contract violation before work even begins.
Here is exactly what the law requires, why lawmakers wrote it this way, and how to build the new paperwork into your estimating and bookkeeping workflow without slowing down jobs.
What SB 517 Actually Requires
The new subdivision (7) of Section 7159 has three moving parts, and they apply to every home improvement contract — any job over $500 in labor and materials on an existing residence.
1. The yes-or-no checkbox
The contract must contain a statement regarding whether or not a subcontractor will be used on the project, with a portion to be checked in response:
- Yes
- No
That is it. No list of names in the contract itself, no percentages, no dollar thresholds. The CSLB's own summary of the 2026 new laws puts it plainly: contractors using subcontractors in home improvement projects must now disclose that information upon request, including the subcontractor's name — while the prime contractor remains responsible for the overall project.
2. The statutory disclaimer when the answer is "Yes"
If the box is checked "Yes," the contract must contain this exact disclaimer:
"One or more subcontractors will be used on this project, and the contractor is aware that a list of subcontractors is required to be provided, upon request, along with the names, contact information, license number, and classification of those subcontractors."
Note what this does: it creates a paper trail proving the homeowner was told, at signing, that they have a right to ask for the full roster — names, phone numbers, license numbers, and license classifications. When a customer later says "nobody told me strangers would be in my house," the signed disclaimer answers the question.
3. The same disclaimer on every change order
If there is a change order during the project, the same disclaimer must appear on each change order. This is the part busy contractors will miss. Your base contract can be perfect, but if your mid-job change orders use an old template without the disclaimer, each one is a fresh violation. Update the change-order form now, not after the first one goes out.
4. The prime contractor stays on the hook
The bill also codifies that, for purposes of administrative discipline, the prime or direct contractor is responsible for completion of the project in accordance with the home improvement contract, plans, and specifications. That responsibility does not preclude discipline against a subcontractor or home improvement salesperson who violates the law on the same job. Translation: "my sub did it" is not a defense at a CSLB hearing, and hiring a sub does not transfer your completion obligation to them.
Why a Checkbox Instead of a Name List
The checkbox is a compromise, and knowing the history helps you understand what regulators actually care about. As originally drafted, the bill would have forced the contract itself to name any subcontractor performing more than half the total estimated project cost, with contact information. Contractor-board staff pushed back: at signing time, a prime often does not yet know exactly which subs will be available weeks later, and a static name list would be wrong before the ink dries.
The amended version — the one that became law — trades front-loaded precision for an ongoing duty: flag the fact of subcontracting up front, then produce the details whenever the homeowner asks. For your business, that means the compliance burden shifts from predicting your sub roster at estimate time to maintaining an accurate, current roster you can hand over on demand. That is fundamentally a recordkeeping discipline, which is good news: it is solvable with systems rather than guesswork.
The Contract Requirements SB 517 Joins
The new checkbox does not replace anything — it sits alongside California's already strict home improvement contract rules. If you are updating your template for SB 517, audit the whole thing against this checklist while you have it open:
- Down payment cap. Never more than 10 percent of the contract price or $1,000, whichever is less, unless you hold a valid blanket performance and payment bond on file with the CSLB. Excessive down payments are among the most common reasons contractors face discipline.
- Schedule of payments. Payments must track work completed — pay as you go, with each payment tied to a defined portion of the job, never a big upfront balance.
- Three-day cancellation right. The buyer may cancel before midnight of the third business day after signing, with the statutory notice and a detachable cancellation form in the contract.
- Bond notice near the signatures. In close proximity to the owner and contractor signatures, a notice that the owner or tenant has the right to require the contractor to carry a performance and payment bond.
- Lien releases before further payment. Upon satisfactory payment for any portion of the work, you must furnish a full and unconditional release from any potential lien-claimant claim or mechanics lien for that portion before any further payment is made.
- The mechanics lien warning. The contract's notice section already warns homeowners that even full payment to you does not stop an unpaid sub, supplier, or laborer from recording a lien — and that a valid lien can force double payment or even a court-ordered sale.
That last item is the reason SB 517 exists. The lien warning tells homeowners the danger; the new disclosure tells them who to watch for. A customer who receives your sub list can track the 20-day preliminary notices, ask about joint checks, and confirm releases — all protections the contract already describes but that were nearly impossible to use without knowing who was actually on the job.
What Homeowners Should Do With the New Disclosure
If you are the customer rather than the contractor, the checkbox changes your pre-signing routine in three small ways:
- Check the box before you sign. If neither "Yes" nor "No" is checked, the contract is already noncompliant — ask the contractor to fix the template, not just scribble in an answer.
- If "Yes," request the sub list immediately — and again mid-job. The roster can change as trades rotate through. Each request should return names, contact information, license numbers, and classifications.
- Verify every license yourself. Run each number through the CSLB's instant license check. An unlicensed sub on your project is a red flag about the prime's vetting, and it complicates lien and insurance protections if something goes wrong.
Keep the list with your preliminary notices. When a notice arrives from a name that is not on any list you received, call your contractor that day — that gap is exactly how surprise liens happen.
Building SB 517 Into Your Bookkeeping Workflow
Here is where compliance meets the books. The contractors who sail through this law will be the ones whose job files already answer every question a homeowner — or a CSLB investigator — can ask. Five habits get you there:
Keep a live subcontractor roster per job
Create one sub ledger per project listing every trade brought on, with name, contact, license number, classification, scope, and dates on site. Update it the day a sub changes, not at billing time. This ledger is simultaneously your on-request disclosure list, your 1099-NEC source file, and your defense exhibit if a complaint alleges an undisclosed worker was on site.
Collect W-9s before the first payment, not in January
Every sub on the roster owes you a signed Form W-9 before money moves. Chasing taxpayer ID numbers during tax season from a tile setter you last saw in March is how missing 1099s — and backup-withholding exposure — happen. No W-9, no check: make it office policy and the January scramble disappears.
Verify licenses and insurance at onboarding
Log the CSLB license-check result and the expiration dates of each sub's workers' compensation certificate and liability policy when they join the job. A lapsed policy discovered after an injury is a business-threatening event; a calendar reminder when you file the certificate is a five-minute task.
Tie payments to releases, every time
The statute already requires unconditional lien releases before further payment once a portion of work is paid for. Operationalize it: your accounts payable checklist for each progress payment should include the sub's invoice, the preliminary-notice log entry, and the signed release. Joint checks — payable to both you and the sub or supplier — remain the simplest way to prove the money reached the party who could lien the property.
Template-control your change orders
Because the disclaimer must appear on each change order, lock your change-order template centrally. If estimators or field supervisors keep personal copies in truck binders or on tablets, one outdated form creates violations faster than any office policy can catch. One master template, version-dated, distributed to everyone who can write a change order.
The Cost of Getting This Wrong
Failure to include required contract provisions is cause for CSLB discipline — the same enforcement bucket as excessive down payments and missing cancellation notices. Discipline can mean citations and fines, stayed or actual license suspension, and a complaint history that future customers see when they look you up. Against that, the fix costs almost nothing: two checkboxes, one paragraph of statutory text, and a roster you should have been keeping anyway.
The deeper payoff is commercial. Homeowners choosing between two bids increasingly ask who will actually be in their home. A contractor who volunteers the sub list before being asked — license numbers included — signals exactly the professionalism that wins higher-margin work. SB 517 turned that signal into a legal minimum; the contractors who treat it as a selling point instead of a burden will get the most out of it.
Keep Your Job Files Audit-Ready From Day One
As subcontractor disclosure becomes part of every California home improvement contract, the contractors who thrive will be the ones whose books already track every worker, payment, and release by job. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
