Billing and cash flow

How do you bill stored materials on a construction pay app?

Bill stored materials only when the contract allows it, back each line with invoices, photos, and proof of title and insurance, and move the value from stored to installed as the material goes in.

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.

To bill stored materials, first confirm your contract allows it and on what terms. Then list the material on its own line or column of the pay application, attach the supplier invoice, delivery ticket, photos, and proof of insurance and (for off-site storage) proof of title, and bill no more than the value of what is actually stored. Each month, move the value out of stored and into work completed as it gets installed. Done right, stored material billing keeps you from financing a $90,000 switchgear order for three months out of your own pocket.

Done badly, it gets rejected, short paid, or creates a mess at closeout when the stored balance never zeroes out.

When stored materials can be billed

Stored material billing is a contract term, not an automatic right. Look for three things in the prime contract or subcontract:

  • Whether stored materials are payable at all. Some contracts pay only for installed work.
  • Where they may be stored. On-site storage is commonly accepted. Off-site storage (a supplier yard, your warehouse, a fabricator's shop) usually carries extra conditions.
  • What backup is required. Invoices, bills of sale, insurance certificates naming the owner, inspection access, and sometimes a bonded warehouse.

Federal fixed-price construction work shows how this usually looks. The FAR payments clause lets the contracting officer take into account material delivered on the site when computing progress payments. Material delivered to locations other than the site may also be considered, but only if that consideration is specifically authorized by the contract and the contractor furnishes satisfactory evidence that it has acquired title to the material, along with other conditions in the clause. Private contracts often borrow similar language.

Step-by-step: billing stored materials

1. Ask before you order

Long-lead items like switchgear, rooftop units, curtain wall, elevators, and fabricated steel are the usual candidates. Before you place the order, tell the GC or owner you intend to bill it as stored and confirm what they will need. This one email prevents most rejections.

2. Take delivery and document it

Get the signed delivery ticket. Photograph the material with identifying tags visible. For off-site storage, note the exact address and how the material is segregated and labeled for this job.

3. Build the backup package

  • Supplier invoice showing quantity, unit price, and job name.
  • Proof of payment or a bill of sale, if title transfer is required.
  • Insurance certificate covering the material where it sits, often with the owner named.
  • Photos and a short inventory list.
  • Lower-tier lien waivers from the supplier if the contract asks.

4. Put it on the pay app correctly

Bill stored material separately from work in place. On a schedule of values continuation sheet, that usually means a stored materials column on the related line, or a separate line, so the reviewer can see exactly what is stored versus installed. Bill the material cost per the invoice and contract, not your full installed unit price.

5. Roll it into installed work

When the material is installed, the line's work completed goes up and the stored amount goes down by the same value. The total earned for that line does not double count. Your stored balance should drop to zero by the time the job is finished.

6. Watch retainage and your waivers

Retainage usually applies to stored materials just as it does to installed work, unless the contract says otherwise. Waive only what is paid.

Worked example: rooftop units stored off site

Say an HVAC sub has a $720,000 subcontract. Four rooftop units totaling $96,000 arrive in May, but the crane pick is not until July. The subcontract allows off-site stored material billing with a bill of sale, insurance naming the owner, and photos. Retainage is 10 percent.

Example stored materials roll-forward for $96,000 of rooftop units
Pay appStored this periodInstalled from storageStored balanceBilled this period before retainage
May$96,000$0$96,000$96,000
June$0$0$96,000$0
July$0$96,000$0$0 net (moves from stored to installed)

In May the sub bills the $96,000 and receives $86,400 after retainage. In July the units go in, so the line's work completed rises by $96,000 and stored drops by $96,000. The July installation labor is billed as normal work in place on its own line. Without stored billing, the sub would have carried the full equipment cost for two months on its own line of credit. Note the June row: nothing new is billed, but the stored balance still shows on the pay app so the reviewer can confirm the units are still in the yard and still insured. Many owners ask for fresh photos each month while material stays stored.

On-site vs off-site stored materials

The two cases get treated very differently by most owners and lenders, so plan for the difference.

On-site vs off-site stored materials at a glance
QuestionOn siteOff site
Usually allowed?Often, if the contract pays stored materialsOnly when the contract specifically allows it
Typical backupDelivery ticket, invoice, photosInvoice, bill of sale or title proof, insurance, photos, inspection access
Main riskTheft, weather, damage by other tradesCommingling with other jobs, supplier insolvency, title disputes
Who usually inspectsSuperintendent or owner's rep on the next walkOwner's rep or lender inspector, sometimes by visit

Lender-funded private jobs add another layer. A construction lender may need its own inspector to see off-site material before it releases funds, and that can add a draw cycle. Ask about the lender's rules at the start of the job, not when the first big order lands. See how construction draws work with lenders.

Mistakes to avoid

  1. Billing stored material the contract never allowed, which gets the whole pay app kicked back.
  2. Billing installed unit prices for material sitting on a pallet.
  3. Missing insurance on off-site material. If it is stolen or damaged, the dispute is yours.
  4. Not moving stored value to installed, so it shows twice or never clears.
  5. Storing material on site where it can walk off. Security is still your problem until it is accepted.
  6. Forgetting the supplier's lien rights. If you have not paid the supplier, the owner may hold your stored billing until you do.

Related templates, terms, and tools

The material delivery log template captures delivery dates and tickets, and the schedule of values template handles the stored column. For long-lead planning, see how to manage long lead items and how to store materials on job sites. The billing form itself is covered in how to fill out AIA G702 and G703.

Smart Business Automator tracks shipments and deliveries alongside invoicing, so the office can see what arrived, where it is stored, and what has been billed against it. See construction accounts receivable automation.

Frequently asked questions

Can you bill stored materials on residential jobs?

Sometimes, if the contract allows it and state law permits. Residential payment rules can be stricter. California's licensing board, for example, advises homeowners not to let payments get ahead of the work, so check your state's rules before billing for material not yet installed.

Is retainage held on stored materials?

Usually yes, at the same rate as installed work, unless the contract sets a different rule for stored material.

What proof of title is usually required for off-site materials?

Often a bill of sale or paid supplier invoice showing the material belongs to you or the owner, plus insurance and a way for the owner to inspect it. The contract sets the exact list.

What happens if stored material is damaged before installation?

That depends on the contract's risk of loss and insurance terms. Typically the contractor bears the risk until the work is accepted, which is why insurance on stored material matters.

Sources

  1. FAR 52.232-5: Payments under Fixed-Price Construction Contracts
  2. California Contractors State License Board: What you should know before you hire a contractor
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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