Subcontractor Change Order (SCO) Invoice Generator
Create general contractor audit-proof invoices for extra work orders, field directives, and approved SCO modifications with automated retainage withholding and statutory conditional lien waivers.
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Click any trade below to instantly load industry-standard work items, hourly labor rates, material markups, and typical scope breakdowns.
1. Your Trade Business (Subcontractor)
2. General Contractor & Job Site Location
3. Billing MethodChoose calculation format
4. Itemized Work, Labor & Materials
5. Retainage Deduction & Taxes
Standard commercial contracts withhold 10% (or 5% on public works).
6. Conditional Lien Waiver & Signatures
Precision Framing & Finish Millwork LLC
Gary Larson, Master Carpenter
1040 Industrial Pkwy, Suite B, Austin, TX 78701
Phone: (555) 342-8921 • Email: [email protected]
License #: C-5 License #512948 • EIN/Tax ID: 84-9182371
INVOICE
Invoice #: INV-1042
Date: 2026-10-12
Due Date: 2026-11-11
Terms: Net 30 Days
General Contractor (Bill To)
Vanguard Commercial Builders Inc.
Attn: Mark Stevens (Project Manager)
500 Commerce Blvd, Suite 400, Dallas, TX 75201
Job Site & Subcontract Info
Oakridge Medical Center - Phase 2
📍 4200 Grand Parkway, Building C, Houston, TX 77001
Subcontract #: SC-2026-089
PO #: PO-9941
Phase/Lot: Building C - 2nd Floor Rough-in
| # | Work / Materials Description | Type | Qty | Unit Rate | Total ($) |
|---|---|---|---|---|---|
| 1 | Framing structural shear walls and load-bearing studs | labor | 40 hrs | $75 | $3,000.00 |
| 2 | Heavy-duty exterior treated deck framing & joists | lump_sum | 1 ls | $4,200 | $4,200.00 |
| 3 | Install finish crown molding & custom baseboards | unit_price | 240 lin ft | $8.5 | $2,040.00 |
| 4 | 2x6 framing lumber & Simpson structural hardware package(Cost: $3100 + 15% contractor markup) | material | 1 lot | $3,100 | $3,565.00 |
CONDITIONAL WAIVER AND RELEASE ON PROGRESS PAYMENT
Statutory FormatUpon receipt of payment in the full net amount of $11,782.96, and when the check or wire transfer has been properly cleared and honored by the bank, the undersigned Subcontractor hereby waives and releases any and all mechanics' lien rights, stop payment notices, and payment bond claims for labor, services, equipment, or materials furnished to Vanguard Commercial Builders Inc. on the project known as Oakridge Medical Center - Phase 2 (Subcontract #SC-2026-089), located at 4200 Grand Parkway, Building C, Houston, TX 77001 through the billing date of 2026-10-12.
This document is expressly conditioned upon actual receipt of collected funds and does NOT cover retainage withheld ($1,280.5), unapproved change orders, or work furnished after the invoice date.
Gary Larson, Master Carpenter
Title: Managing Partner • License: C-5 License #512948
Date: 2026-10-12
Attn: Mark Stevens (Project Manager)
Title: Project Manager / Superintendent
Date: ________________________
How to Successfully Bill Subcontractor Change Orders (SCOs)
📌 1. Reference Prime Contract & SCO Numbers
Always link every change item to its formal General Contractor authorization code or Architect Supplemental Instruction (ASI). If your GC issued SCO #04 for additional drywells, label the invoice line exactly as SCO #04: Drywell excavation per ASI-12.
⚖️ 2. Apply Proper Retainage Math
Under standard AIA G702 / G703 style progress billing, retainage is withheld from change order work at the exact same percentage as base scope. Calculate net due by deducting the 5% or 10% retainage escrow from the gross change order value.
📑 3. Attach Daily Work Tickets
Never bill Time & Material (T&M) change orders without attaching the daily work ticket signed by the GC superintendent on site. Signed tickets verify that the labor hours and materials were performed as claimed.
🛡️ 4. Include Conditional Lien Waiver
General contractors will hold check issuance until receiving an executed conditional lien waiver matching the net pay app amount. Our invoice export generates a statutory conditional waiver automatically at the bottom.
Subcontractor Retainage & Cash Flow Simulator
Simulate your progress payments, GC holdback deductions, and final punch-list retainage release.
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Frequently Asked Questions
What is a Subcontractor Change Order (SCO) invoice?
An SCO (Subcontractor Change Order) invoice is a formal progress payment application that bills for scope modifications, unforeseen site conditions, or architectural revisions beyond the original base subcontract agreement. It itemizes the specific SCO reference number, labor hours, direct materials, equipment rental, agreed overhead markup, and retainage deductions.
How should I itemize a Change Order on my subcontractor invoice?
Always list each Change Order as a dedicated line item referencing the formal signed authorization (e.g., "SCO #03: Relocate 2nd Floor Main Feeder Conduit per RFI #42"). Never combine change order amounts into base contract progress billing, as general contractor project managers will reject the pay application during accounting audits.
Does standard retainage apply to Subcontractor Change Orders?
Yes, unless your prime subcontract agreement explicitly states otherwise, the contractual retainage percentage (typically 5% or 10%) applies equally to all approved change orders. Our generator automatically factors retainage deductions across both base scope and SCO additions.
What documentation must accompany an SCO invoice for fast GC approval?
To prevent GC payment delays, include: 1) The signed SCO authorization form, 2) Daily timecards or foreman work logs signed by the GC field superintendent, 3) Material supplier delivery receipts, and 4) A statutory conditional lien waiver for the billed amount.
What happens if the General Contractor disputes a Change Order amount?
Submit the undisputed base progress billing and approved SCOs immediately to protect your cash flow. Bill the disputed work under a separate "Pending Change Directive" (CCD) or notice of claim in accordance with your contract prompt payment terms.