Engineering Invoice Template

Engineering invoices should make it easy for clients to see what work was completed and which deliverables were produced.

• Client name and billing contact
• Project name
• Engineering discipline (civil, mechanical, electrical, structural, etc.)
• Project location (optional but helpful)

• Consulting hours
• Design and calculations
• Site visits/field work
• Meetings and coordination (if billed)
• Deliverable/report preparation

• Plans/drawings
• Calculations package
• Engineering report
• Stamped documents (if applicable)
• Revisions (if beyond included scope)

• Travel/mileage
• Printing/plotting
• Permit-related expenses (if reimbursable)

• Subtotal, tax (if applicable), total due
• Payment terms and instructions

Engineering services are commonly billed in one of these ways:

1) Hourly billing
Used for consulting and variable scope work. Invoices show hours × rate with clear descriptions.

2) Fixed fee
Common for defined deliverables (a report, a set of drawings). Invoice shows a project fee or milestone fee.

3) Phase-based billing
Large projects are split into phases (concept, design, permitting, construction support). Each phase is invoiced separately.

If you bill hourly, adding a “Deliverables” field helps clients connect billed time to what they received.

Engineering projects often involve revisions. Clear invoicing reduces scope disputes.

• List deliverables explicitly (plans, reports, stamped drawings)
• If revisions are included, define how many rounds (optional)
• Add “Additional revisions” as a line item when scope expands
• Keep meetings and coordination separate if they are billable

Field work often includes travel and expenses.

• Mileage/travel time (if billable)
• Printing/plotting
• Courier/shipping
• Permit submission fees (if reimbursable)