SB 440: California's Change Order Fair Payment Act for GCs (2026)

What SB 440 Actually Does

On October 10, 2025, Governor Newsom signed Senate Bill 440 (Ochoa Bogh), the “Private Works Change Order Fair Payment Act.” It took effect January 1, 2026, and creates something California private works have never had: a mandatory, statutory process for resolving change order disputes. The law is codified at Civil Code sections 8850–8859 and sunsets on January 1, 2030.

Before SB 440, change order disputes on private projects had no statutory framework. Contractors submitted claims, owners sat on them, and disputes festered until someone filed suit. The new law imposes hard deadlines at every step: 30 days to respond, 60 days to pay, 2% monthly interest if you don’t. And it gives contractors an enforceable stop-work right when owners ignore the process.

Think of it as the private-works analog to the public contract claims process under Public Contract Code section 9204 (established by AB 626). If your firm does both public and private work, you now have parallel claim resolution frameworks for each.

Why GCs need to pay extra attention

You sit in the middle. When your sub submits a change order claim, you’re the respondent, subject to the same 30-day response window and 2% interest penalty as an owner. When you submit claims to the owner, you’re the claimant with stop-work leverage. SB 440 gives you tools and obligations simultaneously, and you need separate processes for each role.

The Complete SB 440 Dispute Resolution Timeline

This is the sequence every GC needs to internalize. Miss a deadline and you’re either accruing 24% annualized interest or facing a lawful work stoppage.

Step	Action	Deadline	Consequence of Missing
1	Contractor submits written claim via certified/registered mail	Within 60 days of discovering the issue	Claim may be waived
2	Owner reviews claim and issues written response identifying disputed vs. undisputed portions	30 days after receiving claim	Entire claim may be treated as disputed; triggers conference rights
3	Meet-and-confer conference between parties	30 days after conference request	Owner’s refusal triggers stop-work rights
4	Owner issues post-conference written statement identifying newly undisputed amounts	10 business days after conference	Entire claim treated as disputed; interest clock starts
5	Owner pays undisputed amounts	60 days after written statement	2% per month interest accrues
6	Non-binding mediation for disputed amounts (costs shared equally)	Mediator selected within 10 days or claimant picks	Owner’s refusal triggers stop-work rights
7	Contractor issues stop-work notice if owner non-compliant	Written notice via certified mail	Work stops 40 days after notice—no penalty to contractor

Two things to note. First, every notice under SB 440 must be sent by registered or certified mail with return receipt requested. Email and hand delivery don’t count. Second, these are statutory minimums. Owners and contractors can negotiate additional procedures, but they cannot shorten or override SB 440’s timelines.

Who SB 440 Covers (and Who It Doesn’t)

SB 440 applies to all private works of improvement contracts entered into on or after January 1, 2026. If you signed the contract in 2025, the old rules (or rather, the old lack of rules) still apply.

What’s Covered

Commercial construction projects (office, retail, industrial)
Mixed-use developments
Residential projects over 4 stories
Residential projects with mixed-use components (regardless of height)
Infrastructure improvements on private land

What’s Excluded

Residential projects of 4 stories or fewer that are not mixed use and use Type V construction (wood-frame)
Public works contracts, which are governed by Public Contract Code section 9204 (AB 626)

The residential exclusion is narrower than it sounds. A 3-story apartment building with ground-floor retail? Covered, because that’s mixed use. A 5-story condo? Covered; exceeds 4 stories. A single-family custom home? Excluded. The practical effect: most commercial GCs will be fully subject to SB 440 on virtually every project.

The Claim Process Step by Step

Step 1: Submitting a Claim

Under SB 440, a “claim” is a separate written demand, sent via registered or certified mail with return receipt requested, for either a time extension, payment for additional work performed, or resolution of a disputed payment amount. The claim must include reasonable documentation supporting the demand. Vague assertions won’t cut it; you need scope references, cost breakdowns, and schedule impact analysis.

Contractors should submit claims within 60 days of discovering the underlying issue. Waiting longer risks waiver arguments, even though the statute doesn’t impose a hard cutoff for all claim types.

Step 2: Owner’s 30-Day Response

Once the owner receives a claim, they have 30 days to conduct a reasonable review and issue a written statement. That statement must identify which portions of the claim are disputed and which are undisputed, with documentation supporting the disputed amounts. This isn’t optional. SB 440 mandates the response.

Step 3: The Meet-and-Confer Conference

If the claim isn’t fully resolved by the written response, either party can request an informal meet-and-confer conference. The owner must schedule this meeting within 30 days of receiving the request. The purpose is straightforward: hash out what’s really disputed and narrow the gap before mediation.

Step 4: 10-Business-Day Written Confirmation

Within 10 business days after the conference, the owner must issue another written statement confirming which amounts are now undisputed. If the owner fails to issue this statement, the entire claim is treated as disputed, which accelerates the contractor’s path to mediation and stop-work rights.

Step 5: Payment of Undisputed Amounts (60 Days)

The owner has 60 days from the written statement to pay all undisputed amounts. Miss this deadline and interest starts accruing at 2% per month. That’s 24% annualized. On a $200,000 undisputed change order, that’s $4,000 per month in interest alone.

Step 6: Non-Binding Mediation

Disputed amounts proceed to non-binding mediation. The parties split mediation costs equally. If they can’t agree on a mediator within 10 days, the claimant selects one. That’s a meaningful provision that prevents owners from stalling by refusing to agree on a neutral.

Step 7: Stop-Work Rights

This is the provision with real teeth. If the owner fails to pay undisputed amounts, refuses to participate in mediation, or otherwise ignores the statutory process, the contractor can issue a stop-work notice via certified mail. Work stops 40 days after the notice, and the contractor faces no penalty or liability for resulting delays.

Any contract clause that attempts to waive stop-work rights is void as against public policy. Owners cannot contract around this provision.

Interest Penalties That Actually Bite

The 2% monthly interest rate is the enforcement mechanism that makes SB 440 more than a suggestion. At 24% annualized, it’s punitive by design, well above any commercial lending rate. Some specifics worth tracking:

Undisputed amounts: Interest accrues starting 60 days after the owner’s written statement identifying the amount as undisputed
Disputed amounts later determined owed: If mediation, arbitration, or litigation determines the owner owes a previously disputed amount, the same 2% monthly rate applies retroactively from the original due date
Compounding effect: On a $500,000 disputed change order, 12 months of delay costs the owner $120,000 in interest alone—a 24% penalty that creates genuine incentive to resolve claims quickly

For GCs, this cuts both ways. When you’re the claimant, SB 440 gives you leverage you’ve never had on private work. When you’re the respondent on a sub’s claim, the same interest clock is ticking against you.

Scenario: The $38,400 lesson

Your HVAC sub submits a $160,000 change order claim for unforeseen ductwork rerouting. You acknowledge $80,000 is undisputed but miss the 60-day payment window by four months because the owner hasn’t paid you yet. Under SB 440, you owe the sub $80,000 plus $6,400 in accrued interest (2% × 4 months). Meanwhile, the remaining $80,000 goes to mediation, which takes another eight months. The mediator awards $60,000 to the sub. You now owe retroactive interest on that $60,000 from the original due date, another $14,400. Total interest exposure: $20,800. The owner’s delay became your cost.

The “paid when paid” trap

Most GC-sub contracts have “pay when paid” or “pay if paid” clauses. SB 440 doesn’t care. The interest clock ticks against the GC regardless of whether the owner has paid. Your upstream cash flow problem is not a statutory defense. This is the single biggest exposure point for mid-market GCs, and it’s the reason claim tracking can’t wait until the dispute starts.

Subcontractor Protections Under SB 440

SB 440 doesn’t just protect contractors against owners. It also builds in specific safeguards for subcontractors who lack direct contractual privity with the project owner. These provisions matter because they change how GCs must handle sub claims.

Claim pass-through: A subcontractor can request in writing that the direct contractor submit a claim to the owner on the sub’s behalf. The contractor must notify the sub within 30 days whether the claim was submitted and, if not, explain why.
Good faith obligation: The direct contractor must exercise good faith in fulfilling obligations on behalf of the subcontractor throughout the claim process. This is a statutory duty, not just a contractual one.
No unauthorized settlements: The contractor cannot settle any claim involving the subcontractor’s interests without the sub’s written approval. This prevents GCs from trading away sub claims as part of a broader deal with the owner.

The practical impact for GCs: you can no longer quietly absorb or trade away a sub’s change order claim. SB 440 requires transparency and sub consent at every step. If you’re in the habit of bundling sub claims into your own negotiations with owners, that practice needs to change.

What GCs Should Do Now

1. Update Your Contract Templates

Every private works contract entered into after January 1, 2026, is subject to SB 440’s timelines whether or not the contract mentions them. But smart GCs will add explicit SB 440 compliance language to their contracts and subcontracts. Consider adding:

A change order claims procedure that references Civil Code sections 8850–8859 and incorporates the statutory timelines
Flow-down provisions requiring subcontractors to submit claims through you (the direct contractor) with sufficient documentation
A mediation clause that pre-selects a mediation service or establishes mediator selection criteria to avoid the 10-day default
Additional dispute resolution steps (permitted under SB 440) that don’t delay the statutory process, eg a DRB or project-level dispute panel

2. Build Internal Claim Tracking

SB 440’s deadlines are hard. You need a system (even a spreadsheet) that tracks every claim received and issued, with countdown timers for the 30-day response, 10-business-day confirmation, and 60-day payment windows. The cost of a missed deadline isn’t ambiguity; it’s 2% per month, compounding.

3. Train Your Project Managers

PMs need to understand two things: (a) when they receive a claim via certified mail, the 30-day clock starts immediately, and (b) they cannot negotiate away a sub’s claim without written sub approval. These are operational changes, not just legal nuances.

4. Vet Your Subs’ Financial Stability

SB 440 makes change order disputes more structured, but it doesn’t eliminate the underlying risk: a financially unstable sub is more likely to submit aggressive change orders, more likely to leverage stop-work threats, and less likely to have the documentation to support legitimate claims. Vetting a sub’s compliance history (license status, federal enforcement records, wage violation history) gives you signal on who will be a problem before the change order dispute starts.

A thorough prequalification process catches financial red flags before contract signing. And tools like SiteVetter’s Subcontractor Vetting Snapshot consolidate CSLB license status, OSHA citations, DOL wage violations, and federal exclusion data into a single report. That’s the kind of operational due diligence that helps you avoid the subs most likely to weaponize SB 440.

Sample Contract Language for SB 440 Compliance

These are starting points, not legal advice. Have your construction attorney review and adapt to your specific contracts.

Change Order Claims Procedure

“All claims for additional compensation or time extensions shall be submitted in accordance with California Civil Code sections 8850–8859. Contractor shall submit written claims via registered or certified mail, return receipt requested, within [60] days of the event giving rise to the claim. Owner shall respond within 30 days identifying disputed and undisputed portions. Undisputed amounts shall be paid within 60 days of Owner’s written statement. This procedure supplements but does not replace any additional dispute resolution procedures set forth herein.”

Subcontractor Claim Flow-Down

“Subcontractor shall submit all claims for additional compensation or time extensions to Contractor in writing, with supporting documentation, no later than [45] days after the event giving rise to the claim. Contractor shall submit Subcontractor’s claim to Owner in accordance with Civil Code section 8850 et seq. within [15] days of receipt. Contractor shall not settle any claim affecting Subcontractor’s interests without Subcontractor’s prior written consent.”

Notice Address Provision

“All notices, claims, and correspondence required under California Civil Code sections 8850–8859 shall be sent by registered or certified mail, return receipt requested, to the parties’ respective registered agent addresses set forth below. PO boxes and job-site addresses shall not constitute valid notice addresses. Each party shall notify the other in writing within [10] days of any change to its notice address. Notice sent to an outdated address shall not toll statutory deadlines if the sending party failed to confirm the current registered address.”

Getting the notice address wrong means the statutory clock may not start. Or worse, you miss a claim entirely because it went to a job trailer that got demobilized. Pin this down in the contract, not on the first day of a dispute.

Frequently Asked Questions

Does SB 440 apply to contracts signed before January 1, 2026?

No. SB 440 applies only to contracts entered into on or after January 1, 2026. If you signed a private works contract in 2025, the old common-law rules govern change order disputes on that project.

Can owners waive SB 440’s requirements in the contract?

Not meaningfully. Owners and contractors can negotiate additional procedures, like a dispute review board or escalation protocol, but they cannot override SB 440’s statutory timelines or waive the contractor’s stop-work rights. Any clause attempting to do so is void as against public policy.

Does the 2% monthly interest compound?

The statute specifies 2% per month on unpaid amounts. Whether it compounds monthly or runs as simple interest will likely be clarified by courts, but either way, 24% annualized is a significant cost. On a $300,000 change order, that’s $6,000 per month in interest.

What happens when SB 440 sunsets on January 1, 2030?

Unless the legislature extends or makes it permanent, SB 440 will expire on January 1, 2030. Contracts entered before that date will still be governed by the law for their duration. The four-year sunset suggests the legislature wants to evaluate the law’s effectiveness before making it permanent.

How does SB 440 interact with existing arbitration clauses?

SB 440’s non-binding mediation requirement comes before any arbitration or litigation. After mediation, disputes proceed under whatever dispute resolution mechanism the contract specifies: arbitration, litigation, or otherwise. SB 440 doesn’t override existing arbitration agreements; it adds a mandatory pre-arbitration step.

Does this affect retention payments?

SB 440 specifically addresses change order claims and time extension disputes, not retention. California already has separate retention rules for private works under Civil Code section 8812, which caps retention at 5% on private projects. The two statutes operate independently.

The Bottom Line

The GCs who come out ahead under SB 440 are the ones who know which subs will generate disputes before the contract is signed—not after the certified mail arrives. A compliance-focused vetting process is cheaper than 2% per month.