California Mandates 5% Retention Cap and Standardizes Change-Order Disputes in Private Construction Overhaul

For decades, the private construction industry has operated on a quiet but bruising financial tension: property owners and general contractors routinely hold back 10 percent of a project's payments to ensure the work gets finished, while subcontractors are forced to float the costs of labor and materials out of pocket. When project scopes inevitably change, the resulting disputes over change orders can freeze cash flow for months, leaving smaller tradespeople vulnerable to bankruptcy even on successful builds.[5]

Now, a sweeping overhaul of California's private construction law is resolving that imbalance. Effective January 1, 2026, two landmark statutes—Senate Bill 61 and Senate Bill 440—have fundamentally rewired how money moves through private development projects across the state.[2][4]

The most immediate change is a strict 5 percent cap on "retainage" for private construction contracts. Previously, private developers could negotiate any withholding percentage their bargaining power allowed, with 10 percent serving as the industry standard. Under SB 61, no more than 5 percent of any progress payment can be withheld, and the total retention over the life of the contract cannot exceed 5 percent of the overall price.[1][3]

This cap flows all the way down the payment chain. A general contractor cannot withhold a higher percentage from their subcontractors than the owner is withholding from them. The mandate brings private contracts in line with the rules that have governed California's public works projects for over a decade, effectively freeing up millions of dollars in working capital for local plumbers, electricians, and framers.[1][5]

For the average homeowner planning a kitchen remodel or an accessory dwelling unit (ADU), it is important to note that the traditional 10 percent retainage remains legal. The 5 percent cap explicitly exempts residential projects that are four stories or less, provided they are not mixed-use.[2][4]

However, for anyone investing in mixed-use properties, or for the thousands of local contractors who build them, the financial landscape has permanently shifted. Because there is currently no statutory definition of "mixed-use" in the bill, legal advisors are urging developers to treat any project combining residential and commercial components as subject to the strict 5 percent cap.[6]

The second major pillar of the overhaul addresses the notoriously opaque world of change orders. On complex builds, unexpected site conditions or design revisions frequently require contractors to perform extra work. Historically, owners could delay approving these change-order claims indefinitely, using silence as a negotiation tactic to wear down cash-strapped builders.[6]

The Private Works Change Order Fair Payment Act (SB 440) eliminates this gray area by creating a standardized statutory process for claims. Once a contractor submits a change-order claim, the project owner now has exactly 30 days to respond in writing, forcing a prompt resolution to disputes that previously dragged on for months.[4][5]

If the owner fails to respond, or if undisputed amounts remain unpaid, the new law imposes a severe penalty: the outstanding balance accrues interest at 2 percent per month. This provision gives contractors a powerful mechanism to ensure timely payment and even grants them the right to suspend work if undisputed amounts are ignored.[4]

While these reforms are a massive victory for tradespeople, they force property developers and owners to rethink their risk management strategies. Because owners have less cash leverage to ensure project completion, legal advisors anticipate a surge in demands for performance and payment bonds, letters of credit, or other forms of security before breaking ground.[3]

The laws also carry mandatory enforcement mechanisms. Any contractual provision attempting to waive the 5 percent retainage cap is automatically void, and courts are now required to award reasonable attorney's fees to the prevailing party in any dispute over compliance.[1][2]

As the 2026 construction season accelerates, both builders and buyers are adjusting to a market where cash flows faster, but upfront vetting carries higher stakes. For subcontractors, the legislation represents a long-awaited leveling of the playing field, ensuring that the money they earn reaches their bank accounts when they actually need it.[5][6]