Contractors face a cash flow paradox: your backlog is strong, your projects are profitable, but the money never seems to arrive when you need it. Materials must be paid for before installation. Workers are paid weekly. But progress payments arrive 30–60 days after the billing period, and retainage — the 5–10% withheld on every draw — won't be released until project closeout.
A business line of credit is the standard tool for bridging this gap. Unlike a project-specific loan, a revolving LOC works across all your jobs simultaneously — draw for the Smith project mobilization, draw again for the Johnson job materials order, and repay from whichever payment arrives first.
The Contractor Cash Flow Problem
Construction cash flow problems are structural, not a sign of poor business management. The billing and payment cycle creates predictable gaps:
- Mobilization costs — equipment rental, site setup, initial materials, and permits must be paid before the first progress billing is even submitted.
- Billing lag — most contracts require a monthly application for payment, which then goes through owner review (10–30 days) before a check is issued.
- Retainage accumulation — on a $1M project with 10% retainage and monthly billings, you could have $50,000–$100,000 locked in retainage for 12+ months.
- Material price escalation — tariffs and supply chain volatility have made material cost management more critical than ever. Locking in prices with suppliers requires upfront payment.
- Change order delays — approved change orders still require new billing cycles before payment arrives; you carry the cost in the meantime.
Contractor Project Cash Flow Calculator
Model your project cash flow gap and the line of credit you need to keep operations running smoothly.
Contractor Cash Flow: Costs Outrun Payments
Key Uses of a Contractor LOC
Project Mobilization
Cover the upfront costs — equipment, temporary facilities, first material purchases — before the first progress billing is submitted and paid.
Payroll Between Draws
Weekly or bi-weekly payroll doesn't pause between monthly progress payments. The LOC bridges the gap and keeps crews loyal. See our payroll LOC guide.
Material Purchases & Supplier Float
Lock in material prices, hit supplier MOQs, and take advantage of early-pay discounts without waiting for the next owner payment.
Subcontractor Payments
Pay subs on time to maintain relationships and avoid lien risk. Your LOC lets you honor your payment obligations even when the owner is slow to pay you.
Retainage Float
Retainage locked up in completed phases can represent 10–15% of total contract value. A LOC provides the liquidity equivalent while you wait for final release.
Bid Bonding & Insurance Premiums
Surety bonds and annual insurance premiums often come due before a project's cash flow ramps up. The LOC handles these obligations cleanly.
How Lenders Underwrite Contractor LOCs
Contractor underwriting goes beyond standard small business criteria. Lenders familiar with construction will evaluate:
| Factor | What Lenders Look For | Why It Matters |
|---|---|---|
| Project backlog | 3–6 months of signed contracts | Confirms future cash flow |
| WIP schedule | Costs in excess of billings vs. billings in excess | Shows if you're overbilling (risk) or underbilling (liquidity gap) |
| Retainage outstanding | Total retainage as % of revenue | High retainage = liquidity pressure |
| Owner/GC creditworthiness | Public vs. private owners; GC track record | Your receivable is only as good as the payer |
| Insurance & bonding | GL, workers comp, performance bond capacity | Uninsured contractor = unacceptable risk |
| Project concentration | No single project >50% of revenue | One failed project shouldn't sink the company |
| Seasonality | Revenue patterns by month | Seasonal contractors need larger LOCs |
Documentation for a Contractor LOC Application
In addition to the standard LOC documentation, contractor applications typically require:
- Project backlog summary — list of signed contracts with values, start dates, and expected completion.
- WIP (Work-in-Progress) schedule — showing costs incurred vs. billings to date on each project.
- Schedule of values — the breakdown of contract price by cost category used for progress billing.
- Contractor's license — copy of your state and/or local contractor's license.
- Certificate of insurance — general liability, workers comp, and any required umbrella coverage.
- Bonding capacity letter — from your surety agent, showing your current and aggregate bond capacity.
Best Lender Types for Contractors
| Lender Type | Speed | Typical APR | Construction Experience | Best For |
|---|---|---|---|---|
| Construction-Focused Banks | 2–4 weeks | 7–14% | High | Established contractors with $1M+ revenue |
| Community Banks | 2–5 weeks | 8–16% | Medium | Local contractors with existing banking relationships |
| Online Lenders (BlueVine, OnDeck) | 24–72 hrs | 20–45% | Low–Medium | Newer contractors needing speed over rate |
| SBA CAPLine Program | 60–90 days | Prime + 2.25–4.75% | High (construction-specific) | Maximum credit at lowest long-term rate |
| Construction Factoring Companies | 1–3 days | 18–40% effective | High | Immediate cash against approved invoices/draws |
LOC vs. Construction Financing Alternatives
| Option | Best Use | Flexibility | Typical Cost |
|---|---|---|---|
| Revolving LOC | Ongoing working capital across all projects | Highest | 8–35% APR |
| Construction Factoring | Immediate cash against specific draws | Medium | 2–5% per 30 days |
| Equipment Financing | Specific equipment purchases | Low | 5–15% APR |
| Project-Specific Loan | Single large project mobilization | Low | 8–18% APR |
| Owner-Provided Mobilization | Negotiated advance from project owner | Varies | 0% (if secured) |
Qualifying for a Contractor LOC: Key Tips
- Maintain clean books. Construction accounting is complex; lenders need to see organized job cost accounting, not just revenue totals.
- Build your backlog documentation. A list of signed contracts with values and expected billings is powerful evidence of future cash flow.
- Keep personal credit strong. Most contractor LOCs require a personal guarantee — your personal credit score matters.
- Apply between projects, not during a crunch. Lenders see distressed borrowers; apply when your cash flow is healthy.
- Consider a construction-specialty lender. Banks with dedicated construction lending teams understand WIP schedules and retainage — you won't have to explain your business model.