Billing

What are stored materials in construction?

Stored materials are materials and equipment purchased for a specific job and stored on site or at an approved location, but not yet installed. Many contracts let contractors bill for them before installation, if conditions are met.

Strapped lumber, concrete blocks and a parked telehandler in a commercial construction staging area.
Material quantities, delivery timing and equipment availability shape the next phase of work. AI-generated illustration.

Stored materials are things you have paid for but not put in yet: a switchgear lineup sitting in a warehouse, rebar stacked on site, curtain wall units at the fabricator's yard. Contractors want to bill for them because suppliers want to be paid now. Owners are willing to pay, carefully, because they are paying for something not yet part of their building. On AIA billing forms, stored materials have their own column on the AIA G703 continuation sheet, separate from work completed.

On-site vs off-site storage

Owners treat these differently. Materials on site are visible and easier to verify and insure. Off-site materials are riskier for the owner, so contracts usually add conditions. On federal fixed-price construction contracts, FAR 52.232-5 lets the contracting officer consider material delivered to the site when estimating progress payments. Material delivered off site counts only if the contract specifically authorizes it and the contractor shows it has acquired title and that the material will be used on the contract.

Private contracts commonly require the contractor to show the owner has protection for off-site materials: a bill of sale or invoice, proof of insurance covering the stored location, photos, and sometimes the right to inspect. The contract language controls, so read it before ordering.

How stored materials are billed on a real job

Say an electrical sub buys $186,000 of light fixtures for a hospital wing in month five, and the contract allows billing for materials stored off site with documentation. Installation is planned for months seven and eight.

Example: stored materials over three billing periods
MonthStored this periodInstalled from storageStored balance
5$186,000$0$186,000
7$0$110,000$76,000
8$0$76,000$0

In month seven, $110,000 moves from the stored column into work completed. The total billed for that line does not jump twice; it just shifts columns. Retainage usually applies to stored materials the same way it applies to completed work.

Why stored material billings get rejected

  • No contract permission. Some contracts allow on-site storage only, or none at all.
  • Missing documentation. No invoice, bill of sale, photos, or proof the items are tagged for this job.
  • No insurance certificate covering the off-site location.
  • Title not transferred. If the supplier still owns the material, the owner does not want to pay for it.
  • Double billing. Materials billed as stored and then billed again as installed without moving them out of storage.
  • Not tracking draw-down. The stored balance never goes to zero, and the owner's rep stops trusting the pay app.

Lenders on private jobs often have their own rules, too. A construction lender may send an inspector to verify stored materials, require photos with the job name on the crates, or refuse off-site storage entirely. If the owner's money comes from a loan, ask what the lender needs before you count on billing a big delivery.

Related terms

Stored materials show up in progress payments, the schedule of values, and long-lead items planning. See how to bill stored materials and how to store materials on job sites. Smart Business Automator tracks stored balances by line and links them to the shipments that delivered them.

Frequently asked questions

Can you bill for materials not yet installed?

Often, yes, if the contract allows billing for stored materials and you meet its documentation and insurance conditions. Some contracts limit it to on-site storage.

Is retainage held on stored materials?

Usually. Most contracts apply the same retainage percentage to stored materials as to completed work, but check the contract and any state law.

Who is responsible if stored materials are damaged or stolen?

Typically the contractor until installation and acceptance, which is why owners ask for insurance coverage on the storage location. The contract spells out risk of loss.

What column are stored materials on the AIA G703?

The G703 continuation sheet has a separate column for materials presently stored, which is added to work completed to calculate the total completed and stored to date.

Sources

  1. Acquisition.gov: FAR 52.232-5 Payments under Fixed-Price Construction Contracts
  2. AIA Contract Documents: Instructions, G703-1992 Continuation Sheet
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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