Construction Invoice Calculator
Calculate construction invoices with progress billing, retention, materials, and labor costs. Track project completion and generate accurate payment applications.
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Project Information
Line Items
Progress Billing
Typical: 5-10%
Invoice Summary
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Understanding Construction Invoicing
Construction invoicing differs from standard service billing due to long project timelines, significant material costs, and industry-specific practices like retention and progress billing.
Key Construction Invoice Components
The total agreed-upon price for the complete scope of work. This is the basis for calculating percent complete and billing.
All physical materials used in construction: lumber, concrete, fixtures, supplies. Often billed with markup (15-25%).
Hours worked multiplied by labor rate. Includes wages, taxes, insurance, and benefits. Usually marked up 20-50%.
The percentage of work finished to date. Used for progress billing. Should be verified by owner/architect before billing.
Percentage withheld from each payment (usually 5-10%) until project completion. Protects owner against incomplete work.
Progress Billing Calculation
Standard Markup Rates
| Category | Typical Markup |
|---|---|
| Materials | 10-20% |
| Labor | 20-50% |
| Subcontractors | 10-15% |
| Equipment Rental | 10-15% |
| Overall Project | 15-25% |
Retention Guidelines
- • Residential: 5%
- • Commercial: 5-10%
- • Public Works: 5-10%
- • Some states limit rates
- • Substantial completion
- • Punch list completion
- • Final inspection
- • Lien waiver receipt
Invoice Documentation
- Include detailed Schedule of Values with percent complete per line item
- Attach photos documenting work completion
- Reference contract and change order numbers
- Include lien waivers from subcontractors
- List stored materials separately with supporting documentation
- Note any change orders affecting the billing period
Common Construction Invoice Issues
Billing for more work than completed. Causes cash flow problems at project end. Use honest percent complete assessments.
Assigning higher values to early work items. Can be legitimate but may cause disputes. Be transparent in Schedule of Values.
Disagreements about scope changes. Always get written approval before work and include change orders on invoices.
AIA Forms
The American Institute of Architects (AIA) provides standard construction documents:
- G702: Application and Certificate for Payment
- G703: Continuation Sheet (Schedule of Values)
Many commercial projects require AIA forms. They're widely recognized and provide legal protection.
Pro Tip: Bill promptly and consistently. Submit invoices the same day each month, include all required documentation, and follow up within 24 hours if payment terms are exceeded.
Frequently Asked Questions
What is progress billing in construction?
Progress billing (or progress invoicing) is billing clients based on the percentage of work completed rather than waiting until project completion. It's standard in construction to maintain cash flow for materials and labor costs throughout the project.
What is retention (retainage) in construction?
Retention is a percentage (typically 5-10%) held back from each payment until project completion. It protects the property owner against incomplete work, defects, or contractor default. Retention is usually released 30-90 days after substantial completion.
How do I calculate markup for construction work?
Markup covers overhead and profit. Typical construction markup is 15-25% on materials and labor combined. Calculate: (Materials + Labor) × (1 + Markup %). For example, $10,000 costs with 20% markup = $12,000 total price.
Should I bill materials and labor separately?
Yes, separating materials and labor provides transparency, makes disputes easier to resolve, and may be required by contract. It also helps clients understand costs and allows for different markup rates if needed.
What is a Schedule of Values?
A Schedule of Values breaks down the total contract into line items with assigned values. It's used as the basis for progress billing - you calculate percent complete for each line item and bill accordingly. Subcontractors often use the same approach.
When should I release retention?
Retention is typically released after: substantial completion, punch list completion, final inspection approval, and receipt of lien waivers. Contract terms specify the timeline - usually 30-90 days after final completion.
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