Free Engineering Services Invoice Template Invoice Template
A free, professional engineering services invoice template for consulting engineers, design firms, and PE-stamped practices who bill by phase, hour, or deliverable. Download it as Word, Excel, PDF, Google Docs, or Google Sheets and itemize design hours, drawings, site visits, and reimbursables on a polished statement. Add your firm details, project number, and Net 30 terms for a clean, client-ready invoice.
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| Description | Qty | Unit price | Amount |
|---|---|---|---|
| Principal / PE engineer (per hour) | 12 | $185.00 | $2,220.00 |
| CAD drafting and design (per hour) | 20 | $95.00 | $1,900.00 |
| Site visit and field assessment | 2 | $350.00 | $700.00 |
| Structural calculations and stamped drawings | 1 | $1,200.00 | $1,200.00 |
| Reimbursables — plotting, permits, travel | 1 | $165.00 | $165.00 |
| Subtotal | $6,185.00 | ||
| Sales tax (8%) | $494.80 | ||
| Total | $6,679.80 | ||
Example figures — every field is editable in the download.
Who uses this template
- ✓Consulting engineering firms
- ✓Civil and structural engineers
- ✓Mechanical/electrical (MEP) engineers
- ✓Professional engineers (PE) in private practice
- ✓Design-build and inspection consultants
What to include
- ✓Firm name, PE license, and project number
- ✓Client and project location
- ✓Project phase or milestone billed
- ✓Labor by role and hourly rate
- ✓Deliverables (drawings, calcs, reports)
- ✓Reimbursable expenses at cost
- ✓Net 30 terms and retainer/credit applied
Available in 5 formats
Word (.docx)
Fully editable in Microsoft Word, Google Docs, Apple Pages and LibreOffice — best for quick text edits.
Excel (.xlsx)
Line totals, subtotal and tax calculate automatically — best if you want the math done for you.
A clean, print-ready, fixed layout — best for emailing a finished invoice to a client.
Google Docs / Sheets
Open in your browser, then File → Make a copy to edit and share with your team.
Invoicing tips for engineering services invoice template
- ✓ Bill by phase or milestone (schematic, design development, construction docs) so clients can track progress against scope
- ✓ Break labor out by role and rate; a principal PE and a drafter bill very differently
- ✓ List stamped deliverables separately, since the PE seal carries professional liability and value
- ✓ Pass reimbursables (plotting, permit fees, mileage) through at cost on their own line
- ✓ Apply any retainer as a visible credit and show the remaining balance to keep billing transparent
Engineering Services Invoice Template invoice FAQ
Are engineering services subject to sales tax?
Professional engineering services are exempt from sales tax in most states because they are professional services, not tangible goods. A few states tax certain design services, so confirm your state's treatment, particularly for deliverables.
How should I structure billing for a multi-phase project?
Bill by phase or percent-complete tied to milestones, with a retainer upfront. Each invoice should reference the phase and remaining contract value so clients can reconcile against the proposal.
Do engineering clients issue 1099s?
Business and developer clients paying your firm $600 or more in a year will request a W-9 and may issue a 1099-NEC, unless you are organized as a corporation. Keep your EIN and PE license on file.
What are reimbursable expenses on an engineering invoice?
Reimbursables are direct project costs like plotting, permit fees, travel, or third-party testing, typically billed at cost or with a small multiplier defined in your contract. List them separately from labor and deliverables.
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