Free Structural Engineer Invoice Template & Generator
Generate structural engineering invoices for load calculations, building assessments, foundation design, and plan reviews.
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What to include on a Structural Engineer invoice
Your invoice needs the project address and a brief description that matches how the client refers to it internally. Include your professional engineering license number since their insurance or legal team will want it on file. Break out charges by phase if you quoted that way: schematic design, design development, construction documents, site visits. Show the percentage complete if you're billing hourly against a not-to-exceed cap. Their accounts payable will kick back invoices missing these details.
Most structural engineering contracts call for monthly billing based on hours worked or percentage complete. Some firms ask for a small retainer upfront, maybe 10-20% on larger projects. Payment terms are usually net 30, though you can negotiate net 15 with smaller clients. Bill promptly at month end. Waiting six weeks to invoice makes clients question the charges.
Send invoices to both the project manager and accounts payable at the same time. The PM needs to approve it but AP needs it in their system. Include the original proposal number or contract reference on every invoice. Half of all payment delays happen because your invoice sits in the wrong person's inbox or gets coded to the wrong project number.
Frequently asked questions
How do structural engineers bill?
Structural engineers charge $100–$300/hour, fixed fee per project ($1,000–$15,000 for residential, $5,000–$50,000+ for commercial), or percentage of construction cost. Stamped calculations/plans are additional.
What should a structural engineering invoice include?
Include project scope, calculations performed, plans produced, professional stamp/seal fee, site visits, review meetings, and any geotechnical or materials testing coordination.
Should structural engineers charge for plan revisions?
Include 1–2 rounds of revisions in the original fee. Design changes initiated by the architect or owner after plans are completed are billed at the hourly rate.