By Adam Hicks, CooperBuild AI · November 11, 2026

A construction backcharge (also written "back charge") is a cost a general contractor recovers from a subcontractor because the sub didn't meet an obligation in its subcontract: damage it caused, cleanup it skipped, defective work someone else had to fix, or schedule costs it created. The GC usually takes it as a deduction from what it owes the sub, or bills it separately, as the subcontract allows.

A backcharge holds up when three things line up: a subcontract clause that allows it, written notice with a chance to fix the problem, and cost records that show what the fix really cost. Miss any one of them and it turns into a negotiation. This guide walks through each step.

#What is a backcharge in construction?

It's a cost recovery, not a fine. The GC spent money because a sub didn't do something the subcontract required, and the backcharge moves that cost back to the sub.

Common reasons GCs backcharge:

• Damage to another trade's finished work or to the owner's property
• Cleanup and debris removal the sub was responsible for and didn't do
• Rework to correct defective or incomplete work after the sub didn't come back
• Schedule costs the sub caused, like overtime, re-mobilization or extra equipment rental
• Use of the GC's equipment, materials or temporary services that wasn't part of the deal

A backcharge is not a deductive change order (that removes scope by agreement) and it isn't liquidated damages (a pre-agreed delay amount with its own clause). Keeping those separate keeps the paper trail clean.

#Where does the right to backcharge come from?

From the subcontract. As the construction law firm McDonald Hopkins puts it, the best thing a contractor can do is deal with back charges up front in the subcontract: how they're assessed, what right the sub has to fix the work first, and what rates will be charged (McDonald Hopkins (opens in a new tab)).

Before the job starts, read your subcontract for:

• Notice: written or not, to whom, by what method, and how specific it has to be
• Cure period: how long the sub gets to fix the problem before you step in
• What's recoverable: direct cost only, or cost plus a stated markup for overhead and supervision
• Rates: whether your labor and equipment are charged at the same rates you charge the owner
• Set-off: whether you can deduct from this job's payments, retainage, or other contracts with the same sub
• Disputes: how and by when the sub has to object

Subcontractor-friendly forms push hard the other way. The American Subcontractors Association's recommended language, quoted by the American Society of Concrete Contractors, says no back charge is valid unless the sub gets written notice of the default and reasonable time to correct it before costs are incurred, and that billing must go out by the 15th of the month after the cost (ASCC (opens in a new tab)). Know which version you signed.

State prompt-payment laws can also limit what you withhold and for how long. When the dollars are big or the clause is fuzzy, check with your construction attorney before the first notice goes out.

#How do you issue a backcharge to a subcontractor?

Follow the same steps every time, so every backcharge looks the same when someone reviews it later.

#1. Document it the day it happens

Dated photos, the location, the time, who was there and which trade's work is affected. Put it in the daily report the same day. A note written that afternoon beats a memory three months later.

#2. Send written notice before you fix anything

Describe the problem, cite the subcontract section, state the cure deadline and say that if it isn't fixed you'll do the work and charge the cost. A phone call first is good manners, but follow it with writing. The National Law Review's guidance on documenting backcharges also recommends giving the sub a chance to inspect before any repair starts (National Law Review (opens in a new tab)).

#3. Give them the cure window

If the sub fixes it, there's no backcharge, and that's the best outcome. They can't argue about your labor rates or methods if they did the work themselves.

#4. If they don't, do the work and track the cost separately

Set up its own cost code or T&M ticket for the fix. Track hours, materials, equipment and any third-party invoices as the work happens, not reconstructed later. Tell the sub when the repair will happen so they can watch, and photograph the work.

#5. Issue the backcharge with backup

One package: what happened, the notice history, the photos and the itemized cost with invoices and timesheets attached. Name the subcontract clause again.

#6. Record their response

Accepted, partly accepted or disputed, with the date and the reason. A dispute you logged is easier to settle than one you heard about at closeout.

#7. Recover it the way the contract says

Net it against the sub's next pay application, take it from retainage, or invoice it separately, per the subcontract. Pay the undisputed balance on time.

#When should a backcharge be issued?

As close to the event as you can. A recurring point in a December 2025 r/ConstructionManagers thread on how teams handle back charges: issue them as problems happen, not at closeout, because by then nobody remembers the details and the sub thinks they're done (r/ConstructionManagers (opens in a new tab)).

Late backcharges also wreck your numbers. If the cost sits in your job cost report for months with no matching deduction, the job looks worse than it is until closeout, then suddenly better, if you collect at all.

#What should a backcharge notice include?

Keep it short and factual:

• Project name, subcontractor, and subcontract number
• What happened, where and when, in two or three sentences
• The subcontract section that makes it the sub's responsibility
• Photos and daily report references
• Cure deadline and what you'll do if it passes
• Once the work is done: itemized labor, materials, equipment and third-party costs, with any markup the contract allows
• How you'll recover it (next pay app, retainage or separate invoice)

Leave out opinions and anger. A notice that reads like a penalty gets treated like an insult, and then it goes to the lawyers.

#Common backcharge mistakes

• No notice, no cure period. Fixing it first and telling the sub later is the fastest way to lose the argument.
• Padding. Adding other job overruns to a backcharge turns a fair cost recovery into a fight and costs you the relationship.
• Folding backcharges into change orders. Mixing them with approved change orders hides what each side agreed to. Keep them as separate documents. Our change order process guide covers the other side of that ledger.
• Charging subs for your own problems. If the damage came from a sequencing call you made, it's on you.
• Holding everything. Withholding a whole payment over a small disputed backcharge invites a prompt-payment claim. Withhold what's in dispute and pay the rest.

#How do backcharges affect job costing and retainage?

Treat a backcharge like any other cost on the job until it's recovered. The fix shows up as cost on its own code, and the recovery shows up as a credit against that sub's commitment when you deduct it. If you use retainage as the recovery source, track it so the release amount at closeout is right. See our guides to retainage in construction and construction job costing.

#Keeping backcharge records in one place

The hard part of a backcharge isn't the math. It's finding the photo, the daily report, the notice email and the T&M ticket six weeks later. In CooperBuild AI, daily reports, job chat, job costs and sub bills sit in the same system as the full accounting (GL, AP, AR), so the record and the deduction aren't in separate tools. It also connects to QuickBooks Online if that's where your books live. Assistants can draft the daily report from the job chat for your team to review, and the daily report guide covers what to capture.

If you want your field record and your sub payments on one system, get started with free credits, no credit card needed.

#FAQ

#What is a backcharge in construction?

A backcharge is a cost a general contractor recovers from a subcontractor because the sub didn't meet a subcontract obligation, such as damage, skipped cleanup, defective work or delay costs. It's usually deducted from the sub's payments or billed separately, as the subcontract allows.

#Do you have to give a subcontractor notice before a backcharge?

Most subcontracts require written notice and a chance to correct the problem before the GC does the work and charges for it. Check the notice method and cure period in your subcontract.

#Can a GC deduct a backcharge from retainage?

Often yes, if the subcontract allows set-off against retainage. State prompt-payment laws can limit what you withhold, so pay the undisputed balance and confirm with counsel on large amounts.

#Can a GC add markup to a backcharge?

Only if the subcontract allows it. Some subcontracts allow a stated markup for overhead and supervision; others limit recovery to direct cost.

#How does a subcontractor dispute a backcharge?

By objecting in writing within any deadline the subcontract sets, with its own photos, daily reports and correspondence. Records kept during the work, such as notes about site conditions, carry the most weight.

This article is general information for contractors, not legal advice. Backcharge rights depend on your subcontract and state law, so confirm with your construction attorney.