Construction working capital is the cash a contractor carries between paying labor and materials and collecting from draws and retainage. Windwood Funding Group, a small-business funding broker in Fayetteville, Arkansas, walks Northwest Arkansas contractors through sizing that gap and choosing working capital or a line of credit; lending partners make credit decisions and set rates and terms.
Who this is for
Washington County, AR had 638 construction employer establishments in 2023, and 57.7 percent had fewer than five employees (U.S. Census Bureau, County Business Patterns 2023). Another 3,233 construction businesses had no paid employees in 2024 (U.S. Census Bureau, Nonemployer Statistics 2024). New residential permits in the county swung from 2,176 units in 2023 to 3,502 in 2024 and 2,632 in 2025 (U.S. Census Bureau, Building Permits Survey). Small firms in a market that moves like that need to know how much cash each job will hold hostage.
What is cash flow in construction?
Contractor cash flow is the timing of money in and out of the business, which in construction rarely matches the timing of the work. Payroll goes out every week; materials are often paid on delivery or on short supplier terms; customers pay on a draw schedule, after inspection and approval, and hold back retainage until the end. The difference between profit on paper and cash in the bank is mostly timing.
A worked example, with hypothetical round numbers
These figures are invented to make the arithmetic easy to follow. They are not typical of any trade or of anything a lending partner offers.
- An eight-week job with a contract value of $30,000, billed in two draws of $15,000.
- Materials of $6,000 paid in week 1. Payroll of $2,500 every week.
- Draw 1 billed at the end of week 4, paid 30 days later, at the end of week 8.
- Draw 2 billed at the end of week 8, paid at the end of week 12.
- Ten percent retainage held from each draw until closeout.
| Point in the job | Spent so far | Collected so far | Cash tied up |
|---|---|---|---|
| End of week 1 | $8,500 | $0 | $8,500 |
| End of week 4 | $16,000 | $0 | $16,000 |
| End of week 8, before draw 1 arrives | $26,000 | $0 | $26,000 |
| End of week 8, after draw 1 | $26,000 | $13,500 | $12,500 |
| End of week 12, after draw 2 | $26,000 | $27,000 | -$1,000 (cash positive) |
| After closeout | $26,000 | $30,000 | -$4,000 (the profit) |
The job makes $4,000. But at the end of week 8 the contractor is carrying $26,000 of its own cash, the full cost of the job, and the profit only shows up once retainage is released.
Doing it for your own jobs
- List weekly payroll, materials and equipment costs from start to finish.
- Write each draw's billing date and the date you actually expect payment.
- Subtract retainage from each draw and move it to the closeout date.
- Track the running total of spent minus collected; the peak is the cash the job ties up.
- Add up the peaks of jobs that overlap. That combined figure is what your business really needs.
Working capital or a construction line of credit?
If one large job creates one clear gap, working capital sized to the peak may fit. If jobs overlap and gaps recur every few weeks, a construction line of credit lets you draw for each and repay as draws land. Equipment bought for the job is a separate question: equipment financing keeps a loader or trailer from eating the cash the job needs.
What shortens the gap without borrowing
- Negotiating a mobilization payment or deposit up front
- Billing promptly at each milestone and following up on approvals
- Matching supplier terms to the draw schedule where possible
- Tracking retainage separately so it is collected at closeout
More for contractors
Contractor and construction financing covers draws, lines and equipment; our Fayetteville, AR page has the county figures; the funding notes have more posts.
By Windwood Funding Group ยท Updated