Does an alleged defect defeat my Illinois mechanic's lien?

Not by itself. Under 770 ILCS 60/21(a), a subcontractor has a lien for qualifying labor, services, and materials, and Illinois applies the substantial performance doctrine to defect disputes. W.E. Erickson Construction, Inc. v. Congress-Kenilworth Corp., 115 Ill. 2d 119 (1986). Where the subcontractor substantially performed in good faith, proven defects ordinarily reduce the recoverable balance rather than eliminate the lien. The claimant still carries the burden of proving its entitlement to payment and compliance with the Act. Doornbos Heating & Air Conditioning, Inc. v. Schlenker, 403 Ill. App. 3d 468 (1st Dist. 2010). The lien can fail where there was no substantial performance or other basis for payment, where proven offsets exhaust the balance, or where statutory requirements were not met. The practical consequence is that a subcontractor facing defect allegations should preserve every lien deadline and build the record on the quality of its work at the same time.

Can a general contractor backcharge a subcontractor without notice?

It depends on the subcontract. Where the subcontract makes written notice and an opportunity to cure a condition before the contractor performs corrective work or charges the subcontractor, failure to follow that procedure can defeat or limit the claimed remedy. Midwest Builder Distributing, Inc. v. Lord & Essex, Inc., 383 Ill. App. 3d 645 (1st Dist. 2007). The result turns on the clause, the parties' conduct, and any waiver or excuse. The Mechanics Lien Act does not itself establish a backcharge; recovery depends on contract terms, damages principles, and evidence. Corrective-work charges must be supported by proof of reasonable, necessary work attributable to the breach, rather than an unsupported upgrade or a duplicate recovery. Pyramid Development, LLC v. Dukane Precast, Inc., 40 N.E.3d 1185 (2d Dist. 2014). The practical consequence: locate the notice provision, compare the contractor's actual conduct against it, and put any offer to cure in writing.

Do I still have to serve the Section 24 notice if the contractor is disputing my work?

Yes. Under 770 ILCS 60/24(a), a subcontractor generally must serve written notice of its claim within 90 days after completing its subcontract, subject to the statutory treatment of later qualifying extra work and an exception where the required sworn statement already supplies the notice. Since January 1, 2025, service may be made by certified or registered mail with return receipt requested, by a nationally recognized delivery company with tracking, or by personal service. For an existing owner-occupied single-family residence, a separate notice under 770 ILCS 60/21(c) is due within 60 days after first furnishing. Negotiations, inspections, and settlement talks do not suspend any of these periods. The practical consequence is simple: serve and record on time, then negotiate. A lien preserved during the dispute is leverage; a lapsed lien leaves only a contract claim.

What evidence should a subcontractor gather to answer defect allegations?

Gather the documents showing what you agreed to install and how you installed it. Illinois requires the party seeking an offset for defective work to prove the factual basis and the resulting damages with reasonable certainty. Pyramid Development, LLC v. Dukane Precast, Inc., 40 N.E.3d 1185 (2d Dist. 2014). The subcontractor, for its part, must prove the performance needed to recover its balance. Start with the subcontract, scope of work, approved submittals, change orders, material list, and delivery tickets. Add the manufacturer's written installation instructions for the specific product, dated jobsite photographs, daily reports, inspection records, and any acceptance or punch-list communications. Ask for the contractor's evidence as well: the inspection report, photographs, corrective proposal, and proof of any amount actually paid. The practical consequence: a point-by-point written response, supported by records, turns a general complaint about workmanship into a narrow and negotiable list of disputed items.

Is my contractor's payment to the owner automatically my responsibility?

No. A general contractor's payment to the owner does not, by itself, prove the subcontractor's liability or the amount of recoverable damages. To recover that payment as breach-of-contract damages, the contractor must establish the subcontractor's breach, causation, and damages with reasonable certainty. Pyramid Development, LLC v. Dukane Precast, Inc., 40 N.E.3d 1185 (2d Dist. 2014). A separate indemnity claim depends on the scope, enforceability, and conditions of the indemnity obligation. The absence of an express indemnity clause does not necessarily bar ordinary breach damages, and Illinois recognizes certain implied-indemnity claims in limited circumstances. Maxfield v. Simmons, 96 Ill. 2d 81 (1983). The practical consequence is that a subcontractor should request the documents showing what was paid, to whom, why, and how the loss connects to its own work before agreeing to any deduction from its balance.

Defective Work Claims vs. Illinois Liens

A subcontractor finishes its work, sends the final invoice, and waits. Instead of a check, it receives an email from the general contractor listing alleged installation defects, a replacement proposal from a competitor, and a series of backcharges that, added together, exceed the unpaid balance. The contractor then challenges the subcontractor's lien and demands proof that every statutory step was satisfied.

This is a recurring Illinois construction payment dispute, and it is often misunderstood. A claim of defective work does not automatically defeat a mechanic's lien, and a backcharge is not valid simply because the contractor asserted it. At the same time, a subcontractor that ignores the defect allegations, or lets a lien deadline pass while it argues, can lose leverage it cannot recover.

This article explains how Illinois law treats defect claims and backcharges against a subcontractor's lien rights, and how to respond in a way that protects both the lien and the balance owed.

An Illustrative Dispute: The Roof and the Withheld Balance

Consider a composite example drawn from the kind of matters this firm handles. The names, location, and figures are changed, and the example does not describe the outcome of any client matter.

A roofing subcontractor contracts with a general contractor to replace the roof on a commercial building. The subcontractor installs the roof and invoices a final balance of roughly $20,000. Weeks later, the general contractor reports leaks and alleged lapping and fastening problems. It obtains photographs and a replacement estimate from another roofer, pays the building owner for interior water damage, and announces that it will deduct that payment, the cost of the roofing materials, and consultant fees from anything owed.

The contractor's correspondence makes three moves at once. It disputes the quality of the work. It asserts setoff and recoupment rights. And it attacks the lien itself by demanding the recorded claim, proof of service of the statutory notice, and an explanation of every deadline.

Each move calls for a different response. Treating them as one argument is how subcontractors lose ground.

Defect Claims Usually Go to Amount, Not Existence

The Mechanics Lien Act provides subcontractors a lien for qualifying labor, services, and materials furnished for an improvement. 770 ILCS 60/21(a). Perfect performance is not invariably required, but the claimant must establish its entitlement to payment and its compliance with the Act. Where the subcontractor substantially performed in good faith, proven defects ordinarily reduce the recoverable balance rather than automatically eliminate the lien. If there was no substantial performance or valid excuse for nonperformance, however, lien recovery may fail. Doornbos Heating & Air Conditioning, Inc. v. Schlenker, 403 Ill. App. 3d 468 (1st Dist. 2010), applies these principles in a lien-enforcement action.

The Measure of Recovery

A contractor that substantially performs in good faith generally may recover the contract price, less payments already received and an allowance for proven deficiencies. W.E. Erickson Construction, Inc. v. Congress-Kenilworth Corp., 115 Ill. 2d 119 (1986). The usual allowance is the reasonable cost of correcting defects or completing omissions. Diminution in value is the exception, applied where correction would involve unreasonable destruction or costs grossly disproportionate to the benefit obtained. Replacing defective work is not automatically economic waste. In J-M Builders & Supplies Corp. v. McIntyre, 56 Ill. App. 3d 714 (2d Dist. 1978), the court upheld a repair credit against a lien award and rejected the argument that removing defective siding required a diminution-in-value measure. Whether substantial performance occurred is a question of fact.

Who Must Prove What

The subcontractor must prove the performance necessary to recover its balance and enforce its lien. A contractor seeking an affirmative offset or damages for defective work must prove the factual basis for that relief and its damages with reasonable certainty. In Pyramid Development, LLC v. Dukane Precast, Inc., 40 N.E.3d 1185 (2d Dist. 2014), ¶¶ 34 to 40, the court rejected a general contractor's corrective-work claim because its records did not provide a reasonable basis for calculating damages. Unsupported allegations and speculative charges do not establish a compensable offset.

When the Lien Itself Is at Risk

Proven offsets can exhaust the entire unpaid balance, leaving nothing secured by the lien, even where the subcontractor substantially performed. The lien can also fail for reasons unrelated to workmanship: a late or defective Section 24 notice, failure to take the required timely steps to preserve or enforce the lien against the owner or affected third parties, or a claim knowingly overstated with intent to defraud. 770 ILCS 60/7(a). Those are the issues that most directly threaten a lien, and they are largely within the subcontractor's control.

Backcharges Depend on the Contract and the Proof

A backcharge is a deduction the general contractor takes from the subcontractor's balance for costs it attributes to the subcontractor: corrective work, cleanup, damaged materials, delay, or payments to the owner. A backcharge is not established merely by labeling an expense a deduction. Its recoverability depends on the parties' contractual obligations, applicable damages principles, and supporting evidence. Pyramid Development, 40 N.E.3d 1185. Because a valid backcharge reduces the debt the lien secures, it directly affects the lien amount.

Review the subcontract for the provisions that typically control the outcome:

Notice and opportunity to cure. Whether the contractor must give written notice identifying deficient work and allow time to correct it before performing the work itself or charging the subcontractor.
Scope and specifications. The subcontract, incorporated specifications, and approved submittals define what the subcontractor promised to install. A contractor cannot backcharge for failing to meet a specification the subcontractor never agreed to.
Indemnity and damages limits. Some subcontracts shift specific losses to the subcontractor; others limit consequential damages. The language controls.

Where the subcontract makes notice and an opportunity to cure a prerequisite to corrective work, termination, or charging the subcontractor, failure to follow that procedure can defeat or limit the claimed remedy. Midwest Builder Distributing, Inc. v. Lord & Essex, Inc., 383 Ill. App. 3d 645 (1st Dist. 2007), discusses express conditions precedent, prevention, and waiver in a construction-related setting. See also Associates Asset Management, LLC v. Cruz, 2019 IL App (1st) 182678, ¶¶ 34 to 40, enforcing a substantive notice-and-cure condition outside the construction context. The result depends on the clause, the parties' conduct, and any applicable excuse or waiver. A documented offer to cure, followed by a refusal, can be important evidence, but it does not automatically eliminate liability or fix a damages cap.

Then test each line item. Was the subcontractor told about the problem and invited back to fix it? Is the claimed cost a reasonable repair, or a full replacement with upgraded materials? Did the contractor actually pay the amount, or is it an estimate? Is there evidence connecting the owner's loss to the subcontractor's work rather than to the storm, another trade, or a preexisting condition? Corrective-work charges must rest on evidence of reasonable, necessary work attributable to the breach, and any other claimed loss needs its own contractual and evidentiary basis.

Payments to the Owner Do Not Shift Automatically

General contractors often pay the owner to resolve a complaint and then try to pass that payment down. A payment by the general contractor to the owner does not, by itself, establish the subcontractor's liability. To recover that payment as breach-of-contract damages, the contractor must establish the subcontractor's breach, causation, and recoverable damages with reasonable certainty. Pyramid Development, 40 N.E.3d 1185, ¶¶ 35 to 40.

A separate indemnity claim depends on the scope and enforceability of the indemnity obligation and satisfaction of its conditions. The absence of an express indemnity clause does not necessarily bar ordinary breach damages, and Illinois recognizes certain implied-indemnity claims in limited circumstances. Maxfield v. Simmons, 96 Ill. 2d 81 (1983). Ask for the proof: the owner's claim, the receipt, the basis for the amount, and the link to the subcontractor's specific work.

Your General Contractor Is Withholding Payment Over Alleged Defects?

Send us the subcontract, change orders, invoices, payment history, your photographs and daily records, and every email in which the contractor raised a defect or a backcharge. We will calendar your lien deadlines, evaluate the defect claims against the contract, and prepare a written response that protects both the lien and the balance owed.

All inquiries answered within 1 business day.

Material and Specification Disputes

Disputes about materials, such as panel length, gauge, or profile, turn on the documents. Review the subcontract, incorporated specifications, approved submittals, purchase orders, and any change or substitution approvals. Who ordered the materials, and what did the scope of work or approved material list specify? Acceptance of delivery or allowing installation to proceed may be relevant to authorization, modification, or waiver, but it does not necessarily establish approval of a deviation or surrender of defect remedies. Midwest Builder Distributing, 383 Ill. App. 3d 645. Reconstruct the paper trail before conceding anything.

Respond in Writing, Point by Point

General accusations call for specific answers. The following practices are recommendations, not mandatory procedure, but they consistently narrow defect disputes:

Separate the issues. Address workmanship, backcharges, owner payments, and lien compliance in separate sections so that a weakness on one point does not bleed into the others.
Answer each alleged defect with evidence. Cite the manufacturer's installation instructions for the specific product, dated photographs, inspection records, and any acceptance by the contractor or owner.
Request the contractor's proof. Ask for the inspection report, photographs, the corrective proposal, invoices showing amounts actually paid, and the contract provisions the contractor relies on.
Offer to inspect and cure. Propose a joint inspection, and if a defect is confirmed, offer to correct it. Document the offer and any refusal.
Correct the numbers. Reconcile the invoice with the amount claimed. A small, unexplained discrepancy invites an attack on the entire claim.

When the contractor retains an engineer or consultant, request an opportunity for a joint inspection with your own qualified representative, and ask for the report and underlying data. A construction demand letter is often the right vehicle for this response. It frames the balance owed, rebuts the defect claims, and sets a firm date for payment or a specific counterproposal.

Protect Every Lien Deadline While You Argue

No payment dispute, inspection, or negotiation stops the statutory clock. For a subcontractor on a private Illinois project, the core requirements are:

Section 24 notice: generally within 90 days after completion of the subcontract, subject to the statutory treatment of later qualifying extra work and an exception where the required sworn statement supplies the notice. 770 ILCS 60/24(a). Effective January 1, 2025, service may be made by certified or registered mail with return receipt requested, by a nationally recognized delivery company with tracking, or by personal service. Ordinary email does not satisfy the statute.
Owner-occupied residential notice: for an existing owner-occupied single-family residence, a separate notice within 60 days after first furnishing, not after completion. A late notice preserves the lien only to the extent the owner has not been prejudiced by payments already made. 770 ILCS 60/21(c).
Protection against third parties: within four months after completion, record the statutory claim or commence an enforcement action. 770 ILCS 60/7(a); 770 ILCS 60/28.
Enforcement: commence suit to enforce the lien, or file the required counterclaim, within two years after completion, subject to qualifying extra work and any earlier Section 34 deadline. 770 ILCS 60/9; 770 ILCS 60/28.
Section 34 demand: a compliant demand can require the claimant to sue, or answer in a pending suit, within 30 days or forfeit the lien. 770 ILCS 60/34.

Identify the legally operative completion date from the actual work and the contract, and confirm the resulting dates on our Illinois subcontractor lien deadlines page. Do not assume that a warranty or corrective visit restarts the periods; genuine remaining contract work or qualifying extras require separate analysis.

Do not rely on a private standstill agreement to preserve statutory notice, recording, priority, or enforcement rights without specific legal analysis. The Act does not create a general mechanism for private extensions, and an agreement between the subcontractor and the general contractor may not bind a lender or purchaser that never signed it. Preserve those rights on time while negotiations continue.

State the Lien Amount Carefully

Defect allegations create a quiet risk for the subcontractor: overstatement. An honest mistake or a genuine dispute over the amount does not, by itself, defeat the lien for the amount properly due. But knowingly filing a materially overstated lien with intent to defraud can invalidate the entire lien on a constructive fraud theory. Fraudulent intent requires evidence beyond the overstatement alone, and it is assessed when the original or amended lien claim is filed. 770 ILCS 60/7(a); Springfield Heating & Air Conditioning, Inc. v. 3947-55 King Drive at Oakwood, LLC, 387 Ill. App. 3d 906 (1st Dist. 2009); Englewood Construction, Inc. v. J.P. McMahon Properties, LLC, 2025 IL App (3d) 240389, ¶¶ 61, 65 to 74.

State the amount from the contract, approved change orders, and payments received. Exclude disputed extras that lack written support, or explain them clearly. If the subcontractor concedes that a specific item needs correction, address that item honestly rather than ignoring it. Accuracy protects the lien; inflation endangers it.

The Prompt Payment Act and Withholding

On projects covered by the Illinois Contractor Prompt Payment Act, a contractor must pay its subcontractor within 15 calendar days after receiving the corresponding periodic payment, final payment, or retainage, where the subcontractor performed according to its contract and the work was accepted by the owner, the owner's agent, or the contractor. The obligation is to pay the full amount received for that subcontractor's completed work. 815 ILCS 603/10(2). Payments due under the Act but not timely made bear interest at 10% per annum. 815 ILCS 603/15(a).

The Act does not cover every private project. It excludes contracts requiring public funds and contracts for single-family residences or multifamily residences with 12 or fewer units in one building. 815 ILCS 603/5(b).

The Act's written withholding statement applies at the owner level. An owner's payment application is deemed approved 25 days after receipt unless the owner delivers, before that period expires, a written statement identifying the amount withheld and the reason; for nonconforming work, the owner may withhold only the reasonable value of that portion. 815 ILCS 603/10(1). Section 10(2) does not expressly repeat that mechanism for contractor-to-subcontractor withholding, so the subcontract's own notice provisions often control. A subcontractor that intends to suspend work for nonpayment under the Act must give seven calendar days' written notice. 815 ILCS 603/15(b). Whether the contractor has been paid by the owner for the subcontractor's work is a fact worth establishing early, through sworn statements, pay applications, or direct inquiry after the Section 24 notice is served.

How Emalfarb Law LLC Helps Subcontractors in Defect Disputes

The firm represents subcontractors, roofers, and suppliers across Illinois when a general contractor uses defect claims to avoid payment. Depending on the project, an engagement typically includes:

Deadline control: identifying the completion date, serving the Section 24 notice, and recording the lien on time.
Contract review: analyzing notice-and-cure, scope, indemnity, and payment provisions against the contractor's conduct.
Evidence development: assembling manufacturer requirements, photographs, and records, and coordinating an independent inspection where warranted.
Written response: preparing a point-by-point rebuttal and demand that narrows the dispute to provable items.
Resolution or enforcement: negotiating a settlement, or filing suit to foreclose the lien and recover the balance.

Roofing contractors face these disputes often, because leaks invite quick blame. The same principles apply to every trade.

Next Steps

If your general contractor is withholding payment over alleged defects, contact Emalfarb Law LLC before you answer the next email. Have the subcontract, change orders, invoices, payment history, photographs, and the contractor's defect correspondence ready for review. The first priority is the lien calendar; the second is a written record that answers each accusation with evidence.

This article provides general information about Illinois law, not legal advice for a particular project. The example above is a composite with changed facts. Results depend on the contract, the evidence, statutory compliance, and the court. Reading this article or contacting the firm does not, by itself, create an attorney-client relationship.