What Is Retainage in Construction? A Guide for Owners and Developers

Retainage is one of the oldest risk-management tools in construction contracting, and one of the least understood outside the industry. For owners and developers, it functions as financial leverage to ensure a project finishes correctly. For contractors and subcontractors, it’s cash they’ve earned but can’t collect until a job is fully closed out, often the difference between healthy cash flow and a strained one on a long project.

California just changed the rules on how much of that leverage an owner can hold. This guide covers what retainage is, how it works on a construction project, what’s changed under California’s new retention law, and what owners and developers should do to manage risk under the new limits.

Retainage Definition: What It Is and Why It Exists

Retainage, also called construction retention, is the percentage of each progress payment an owner or upper-tier contractor withholds from a contractor or subcontractor until specified project milestones or final completion. Rather than paying 100% of every approved invoice, the paying party holds back a portion as security that the work will be completed correctly, punch list items will be resolved, and the project will actually close out, not just reach substantial completion and stall.

Historically, retainage on private construction projects in California ran as high as 10%, mirroring what remains standard in much of the country. That figure has now changed, which is the most important update in this guide.

How Retainage Works on a Construction Project

On a typical project, retainage functions as follows:

1. A percentage is withheld from each progress payment, based on the value of work approved in that payment application.
2. The withheld amount accumulates over the life of the contract, creating a retainage balance the paying party holds as security.
3. Retainage is released at defined milestones or at project completion, often in stages, a partial release when a project reaches substantial completion, with the remainder tied to punch list closeout and final documentation.
4. The same structure flows down the contract chain. An owner withholds retainage from the general contractor, who in turn withholds a corresponding amount from subcontractors.

This flow-down structure means a change to the retainage percentage at the top of the chain affects every tier below it, which is exactly what California’s new law addresses directly.

California’s New Retainage Rules: The 5% Cap

Effective January 1, 2026, California Senate Bill 61 caps retention on most private construction contracts at 5%, down from the roughly 10% that had been standard industry practice, and aligning private-project rules with the cap that has applied to public works for years. Under the amended Civil Code Section 8811:

• No more than 5% of any single progress payment may be withheld as retention by an owner, direct contractor, or subcontractor.
• Total retention withheld over the life of the contract cannot exceed 5% of the total contract price.
• The cap flows down the payment chain. If an owner negotiates a lower retainage percentage with the general contractor, the contractor cannot withhold a higher percentage from subcontractors.
• The cap cannot be waived by contract. Any provision attempting to set retainage above 5% is unenforceable, regardless of what the parties agree to.
• Violations carry real teeth, including a 2% per month penalty on improperly withheld amounts and liability for the prevailing party’s attorneys’ fees in an enforcement action.

There are two notable exceptions: the cap doesn’t apply where a contractor gave advance written notice that a payment and performance bond would be required and the subcontractor failed to provide one from a qualified surety, and it doesn’t apply to most residential projects that aren’t mixed-use or don’t exceed four stories. Commercial and most multifamily developments fall squarely within the new 5% cap.

Ironside structures payment applications and retainage schedules to the current statutory limits on every applicable project, which matters as much for compliance as for keeping subcontractor cash flow, and therefore project momentum, healthy through construction.

Retainage in Accounting: Payable vs. Receivable

Retainage shows up differently on each side of the transaction, which is a common point of confusion:

• Retainage payable is the liability recorded by the party withholding funds, an owner or general contractor, representing the amount owed to the contractor or subcontractor once retention is released.
• Retainage receivable is the corresponding asset recorded by the party whose payment was withheld the amount they’re owed, but haven’t yet collected.

Both are typically tracked separately from standard accounts payable and receivable, since retainage isn’t due on the same timeline as a normal invoice, it’s tied to project milestones or final completion rather than standard payment terms. For owners and developers, retainage payable should be reflected clearly in project cash flow projections; it’s a real, non-optional line item that comes due, not a permanent reduction in project cost.

Why Retainage Matters to Owners and Developers Beyond Compliance

Retainage isn’t just a compliance line item, it’s a project risk tool, and the reduced cap changes how much of that tool owners still have available:

• Less retainage means less leverage to ensure punch list and closeout work gets completed promptly, particularly on projects with slim contractor margins where the incentive to finish minor remaining items may weaken once most of the contract value has been paid.
• Contractors may push for other forms of security. Payment and performance bonds, letters of credit, or more frequent milestone-based payment structures, to offset the reduced retainage available to owners.
• Cash flow planning shifts earlier in the project, since less capital is held back for the closeout phase and more moves out the door during active construction.

None of this means retainage stops functioning as security, it means owners and developers need to structure the rest of their risk management more deliberately around a smaller retainage buffer than the industry has historically relied on.

What Owners and Developers Should Do Under the New Rules

1. Update contract templates and payment application procedures to reflect the 5% cap before executing new contracts, the law applies prospectively to contracts entered on or after January 1, 2026.
2. Evaluate bonding requirements more deliberately on projects where the reduced retainage changes the owner’s risk exposure, particularly with new or unproven subcontractors.
3. Tighten milestone-based payment and inspection procedures, since less retention is available to backstop loose closeout discipline.
4. Confirm whether a specific project qualifies for an exception. Mixed-use classification and bonding-notice exceptions are fact-specific and worth confirming with counsel before assuming the cap applies or doesn’t.
5. Build the new retainage schedule into cash flow projections early, rather than defaulting to prior-project assumptions that no longer reflect current law.

Build Your Vision with Ironside

Ironside Building is a full-service Southern California general contractor based in Irvine, managing payment applications, retainage schedules, and closeout on commercial and multifamily projects in full compliance with current California law. Our accountable, transparent approach to project financials means owners always know exactly what’s been withheld, why, and when it’s due back, no surprises at closeout.

If you’re structuring a new contract or want a current retainage schedule reviewed against the new statutory cap, schedule a consultation with our team before your next project moves into contract.