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Industry guide

Financing a Construction Contracting Business: Lines, Equipment and Bonding

By the GoHarvest editorial team · Updated · 1 min read

Short answer

Construction firms usually borrow to bridge the gap between paying crews and suppliers and getting paid on progress billings, often with retainage held back until a job is done. Lines of credit, equipment financing and, for some, factoring are common. Bonding capacity, which depends on financial statements, often matters as much as loans.

Key points

  • Retainage and slow pay applications create long receivable cycles.
  • Lenders and sureties want job-cost reporting and work-in-progress schedules, not just tax returns.
  • Heavy equipment can usually be financed against itself.
  • SBA runs a Surety Bond Guarantee program that helps small contractors get bonded.

Construction is profitable work with awkward cash flow. A contractor pays labor weekly and suppliers within 30 days, but bills monthly on progress and may wait 30 to 60 days or more for payment, with a percentage held back as retainage until the project closes out.

Where the money gap comes from

  • Pay applications: owners and general contractors approve progress billings on their own schedule.
  • Retainage: a share of each payment held until completion, sometimes for months.
  • Mobilization: materials, equipment and crews before the first payment.
  • Change orders: extra work done before it's approved and billed.

Common financing tools

Need Typical tool
Payroll and materials between draws Bank line of credit, often against receivables
Excavators, trucks, lifts Equipment loans or leases secured by the equipment
Slow-paying commercial customers Invoice factoring (some factors specialize in construction; retainage is usually excluded)
Larger short-term contract needs SBA CAPLines, including a Builders CAPLine for construction or renovation for sale
A yard or building Commercial mortgage, SBA 504 or 7(a)

What lenders look for

Lenders and sureties look past the tax return to how jobs perform: work-in-progress (WIP) schedules showing over- and under-billings, job-cost reports, backlog, accounts receivable aging and the firm's history of finishing jobs on budget. Contractors that produce these monthly tend to get larger lines and bonding capacity.

Bonding is part of the capital picture

Public and many private jobs require performance and payment bonds. Sureties underwrite much like lenders, focusing on working capital, net worth and experience. SBA's Surety Bond Guarantee program guarantees bonds issued by participating sureties for small contractors who might not otherwise qualify.

Watch-outs

  • Using a line to buy long-lived equipment, leaving nothing for payroll.
  • Taking daily-debit advances against uneven construction receipts.
  • Underbilling: work done but not billed looks like weak cash flow to a lender.
  • Personal guarantees on bonds through indemnity agreements; read them as carefully as loan guarantees.

Sources

  1. SBA: Surety bonds
  2. SBA: Types of 7(a) loans (CAPLines, including Builders CAPLine)

Checked November 9, 2026. Program rules and scoring models change; the source is the authority.

Questions people ask

Will a factor advance against retainage?

Usually not. Most factors exclude retainage because it isn't payable until project completion and can be disputed. Plan to carry retainage with your own cash or a line of credit.

Why does my surety care about my financial statements?

Sureties guarantee that you'll finish the job and pay subcontractors and suppliers, so they underwrite much like lenders, focusing on working capital, net worth, experience and how past jobs performed. CPA-prepared statements often support larger bonding capacity.

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