9 min read · Guide
A few weeks into a re-side, an official-looking envelope arrives from a lumberyard or supplier you never hired, warning that they could put a lien on your home. For a lot of homeowners that's a jolt — it reads like a threat. It usually isn't. It's a preliminary notice, and it's a routine, legally required part of nearly every California construction project. Understanding how mechanics liens actually work turns that moment of panic into a shrug, and it hands you a few simple habits that keep the risk near zero. A quick, honest disclaimer first: we're siding contractors, not attorneys, so this is general information drawn from the state's own consumer guidance — not legal advice, and not a substitute for a lawyer if a real dispute develops. With that said, here's the plain-English version of what these notices mean and how to protect yourself.
What a mechanics lien actually is
A mechanics lien is a legal claim that a contractor, subcontractor, or material supplier can record against your property if they provided labor or materials to improve it and weren't paid. It exists because the people who physically build and supply a project take on risk, and the law gives them a way to secure payment. The catch that surprises homeowners: under California law, a subcontractor or supplier can have lien rights even if you paid your general contractor in full — because if the general contractor took your money and didn't pay them, the unpaid party can still look to the property. That sounds alarming, but it's exactly why the protections below exist, and why an organized homeowner rarely has a problem.
The preliminary notice — routine, not a threat
The document that scares people most is the least scary. A preliminary notice (sometimes called a '20-day notice') is served by subcontractors and suppliers near the start of their work, and California's mechanics-lien system essentially requires it to preserve any future lien rights. Per the CSLB, a subcontractor or material supplier generally has 20 days after first furnishing labor or materials to serve you this notice. It is not a lien, not a bill, and not a sign anything is wrong — it's a supplier saying, in effect, 'we're providing materials to your job and following the legal steps.' The smart move is simply to keep every preliminary notice you receive in one folder, because that list tells you exactly who could claim against the property, which is precisely who you'll want releases from.
Joint checks — pay the supplier and the contractor together
Here's the single most effective habit against the 'I paid but the sub didn't' scenario: joint checks. The CSLB's guidance is direct — paying your contractor doesn't guarantee the subcontractors and suppliers got paid, so make the check payable to both the contractor and the supplier or subcontractor named on a preliminary notice. A two-party check can't be cashed unless both endorse it, which means the supplier confirms they've been paid before the money clears. It's a small mechanic that closes the biggest gap in the whole system, and any legitimate contractor will understand exactly why you're doing it.
Lien releases — get a signed waiver at every payment
The second habit is releases. Before or as you make a payment, get a signed waiver and release from the parties who could claim — the CSLB is explicit that no lien release is binding unless the claimant signs and delivers it. There are two flavors worth knowing: a conditional release, which takes effect once your payment actually clears, is the right one to get in exchange for a progress or final payment; an unconditional release, which is effective immediately regardless of whether the check clears, should only be signed after payment has genuinely gone through. California's waiver forms follow statutory templates (Civil Code §8132, §8134, §8136, and §8138), so a proper release looks like one of those forms — not a hand-scrawled note. Collecting a conditional release with each payment and an unconditional one at the very end is how you build a clean paper trail.
The Notice of Completion — shortening the lien window
One more tool works in your favor at the end of the job. When the project is finished, recording a Notice of Completion with the county starts a shorter clock on how long anyone has to record a mechanics lien, compressing the window from the default period down to a matter of weeks. It's a California Civil Code mechanism (separate from the contract-warning requirements), and recording it promptly at completion is a clean way to close out the lien exposure faster. Because the exact deadlines and who's eligible to record turn on specifics, this is a good moment to confirm the current timing with the county recorder or an attorney — but knowing the tool exists is what matters: a Notice of Completion is a homeowner's friend, not the contractor's.
What the contract itself already protects
Some of this protection is built into the paperwork before you ever get a notice. For residential construction contracts, California Business & Professions Code §7164 requires a written agreement that must include a mechanics-lien warning explaining these exact risks in plain language, along with the contractor's name and license number and the project details. So the mechanics-lien warning in your contract isn't boilerplate to skim — it's the state making sure you were told. If a contract you're handed lacks that warning, or the contractor is vague about liens and releases, treat it as a signal to slow down. A contractor who walks you through joint checks and releases without being asked is showing you the same discipline that keeps a payment schedule honest — the kind of behavior our deposit and payment-schedule guide describes.
Your simple, low-anxiety playbook
Put together, the routine is short: keep every preliminary notice in one folder so you know who could claim; pay with joint checks made out to the contractor and any noticed supplier; collect a signed conditional lien release with each progress payment and an unconditional release at the end; and record a Notice of Completion when the job wraps. Do those four things and a mechanics lien becomes an almost theoretical risk rather than a live worry. It pairs naturally with hiring well in the first place — verify the license before you sign and watch for the red flags that tend to accompany payment trouble. When you request an estimate from us, the contract carries the required lien disclosures and we're glad to structure payments and releases exactly this way.
Key takeaways
- A preliminary notice ('20-day notice') is routine and legally required — it's not a lien, a bill, or a sign of trouble.
- In California a subcontractor or supplier can claim a lien even if you paid your general contractor in full.
- Joint checks (payable to contractor and supplier together) are the single best defense against 'paid-but-not-passed-on' liens.
- Get a signed conditional release at each payment and an unconditional release only after payment clears (Civil Code §8132–8138).
- Recording a Notice of Completion shortens the window during which anyone can record a lien.
FAQ
Quick Answers
No. A preliminary notice (or '20-day notice') is a routine, legally required document that subcontractors and suppliers serve near the start of their work to preserve possible lien rights. It's not a lien, a bill, or a sign anything is wrong. File it — the notices you collect simply tell you who could claim against the property, which is who you'll want lien releases from. We're contractors, not attorneys, so treat this as general information.
Yes, that's possible in California — if your general contractor was paid but didn't pass payment to a subcontractor or supplier, that unpaid party can still look to the property. It sounds alarming, but joint checks and signed lien releases are exactly how homeowners prevent it. Paying your contractor alone doesn't guarantee the suppliers were paid, which is why the CSLB recommends two-party checks.
A joint check is made payable to both your contractor and a supplier or subcontractor named on a preliminary notice. Because both parties must endorse it, the supplier confirms they were paid before the money clears — closing the gap where a contractor collects your payment but doesn't pass it on. It's the simplest, most effective habit against a mechanics lien, and any legitimate contractor understands why you're doing it.
A conditional release takes effect only once your payment actually clears — that's the one to get in exchange for a progress or final payment. An unconditional release is effective immediately regardless of whether the check clears, so it should only be signed after payment has genuinely gone through. California's forms follow statutory templates (Civil Code §8132, §8134, §8136, §8138), so a proper release looks like one of those forms, not a handwritten note.
Yes. Recording a Notice of Completion with the county when the job finishes starts a shorter clock on how long anyone has to record a mechanics lien, compressing the default window considerably. It's a California Civil Code tool that works in the homeowner's favor. Because the exact deadlines turn on specifics, confirm the current timing with your county recorder or an attorney — but recording it promptly is a clean way to close out lien exposure.
Sources
Authoritative references
- CSLB — How to Prevent a Mechanics Lien (preliminary notice, joint checks, releases)
- CSLB — A Homeowner's Guide to Preventing Mechanics Liens (PDF)
- CSLB — Conditional & Unconditional Waiver and Release forms (Civil Code §8132–8138)
- California Business & Professions Code §7164 — required residential construction contract terms & mechanics-lien warning
External links to government, code, and manufacturer sources. Sierra Siding is not affiliated with these organizations; references are provided for verification.