The 2026 regulations, primarily driven by Senate Bill 440 (SB 440), fundamentally restructure how construction disputes are handled in California through several key mandates:

• Mandatory Mediation: Before any legal action or litigation can be initiated for private works claims, parties are now required to participate in structured mediation. This change is designed to resolve payment disputes efficiently and reduce the burden on the court system.
• Structured Notice and Cure Periods: The law introduces a mandatory 30-day notice period followed by a 60-day cure period that must be completed before a party can pursue legal action. Meticulous documentation during these phases is critical to preserving legal rights.
• Compressed Owner Response Timelines: Owners are now required to respond to payment claims within 15 days, a significant reduction from the previous 30-day standard. This requires owners to promptly evaluate claims and provide specific objections to avoid penalties.
• Stricter Interest Penalties: To incentivize timely resolution of payment disputes, the law imposes a mandatory 2% monthly interest penalty on late payments. This rate is higher than most standard contract-based interest provisions.
• Standardized Retention Caps: Under Civil Code Section 8811, retention on private projects is generally capped at 5%. This statutory ceiling provides a clearer economic framework for disputes compared to previous years when retention was often governed by varying contract terms.

• California Construction Law Updates 2026: Key Changes