Construction line of credit: how it works, who qualifies, and real alternatives

A construction line of credit is a revolving credit facility — usually from a bank, credit union, or online lender — that lets a contractor draw cash as needed, repay it, and draw again, instead of taking one lump-sum loan. It's built for exactly the problem every contractor deals with constantly — whether you're a general contractor carrying a project's draw gap, a subcontractor waiting on a GC, or a specialty-trade contractor (electrical, plumbing, HVAC, concrete, roofing, excavation) fronting materials before a pay app clears: money goes out for materials, crews, and equipment weeks or months before the payment comes back. Real ones exist (Bluevine, Fundbox, OnDeck, and local banks all offer them), but qualifying is harder than the ads suggest — and there are honest alternatives when the bank says no.

Why contractors search for this

Construction runs on a timing mismatch. You buy materials and pay labor now. You don't get paid until a pay application works through the GC or owner's approval chain, sometimes with retainage held back on top of that. Subcontractors now wait an average of 56 days after submitting a pay application to actually get paid, despite general contractors believing it takes about 30 days — and the average subcontractor's total wait has stretched to roughly 96 days since work is performed, up from 90 days in 2019 (Billd, 2025 State of Subcontractor Billing). More than 75% of subcontractors say they're covering vendor costs out of pocket while they wait (Siteline, 2025).

Layer that on top of construction's notoriously thin margins — commercial contractors typically run net margins in the low-to-mid single digits (CFMA benchmarking data) — and you get a business where a single slow-paying GC can create a real cash crunch even when the underlying work is profitable. A revolving line of credit is the textbook tool for this: draw when a pay app is outstanding, repay when it clears, repeat on the next job.

What a real business line of credit actually is

A business line of credit is revolving capital. You're approved for a credit limit — say $50,000 or $250,000 — and you draw only what you need, when you need it. Interest (or fees) accrue only on the amount drawn, not the full limit. As you repay, the available credit resets, so it's reusable across jobs rather than a one-time infusion.

For a contractor, the practical use cases are narrow and repeatable:

• Buying materials for a job before the first draw request is approved
• Covering payroll during the gap between pay applications
• Bridging the retainage period on a project that's otherwise done
• Smoothing cash flow across multiple jobs running on different billing cycles

That's different from a term loan (fixed amount, fixed schedule, use it once) and different from equipment financing (tied to a specific asset). A line of credit is for the ongoing, recurring gap — which is exactly what construction produces job after job.

The gap looks a little different depending on where you sit on the project. A general contractor draws to keep a job funded between owner draws — paying subs and suppliers so work doesn't stall while the next pay app moves through approval. An electrical or plumbing subcontractor draws to buy the panel, conduit, fixtures, or copper up front, weeks before the GC releases payment on that pay application. A concrete or excavation contractor might draw to cover a big mobilization and crew cost at the start of a job when almost all the money goes out before any comes in. An HVAC or roofing sub uses it to float a large equipment or materials order for a single project without draining the operating account they need for payroll on three other jobs. Same tool, same revolving mechanic — the timing problem just wears a different uniform depending on the trade.

The two paths: bank lines vs. online lenders

Bank and credit union lines of credit are the cheapest option on paper — lower rates, but they come with real underwriting: usually 2+ years in business, strong personal and business credit (often 680+), collateral or a personal guarantee, and financial documentation that goes well beyond a bank statement. Approval also takes time — often weeks, not days. And banks have gotten more selective with small commercial borrowers generally: at small banks, the share of small-business financing applicants who get fully approved runs around 57% even in a loosening-standards environment (Federal Reserve 2025 Small Business Credit Survey) — and that's across all industries, before you factor in that construction is treated as higher-risk by many underwriters because of job-to-job revenue volatility and collateral concerns.

Online lenders built products specifically to fill that gap — faster decisions, lower credit and time-in-business thresholds, and applications that run on bank-statement and revenue data instead of a full loan-committee package. The tradeoff is cost: rates and fees are meaningfully higher than a bank line, and credit limits tend to be smaller.

Here's how the well-known providers compare, plus where Byzfunder's ByzFlex fits.

Where ByzFlex fits — and where it doesn't

ByzFlex is Byzfunder's revenue-based revolving capital product. It's built to function like a line of credit for the contractor using it — draw against available capacity, repay, draw again — but it is not structured or regulated as a line of credit. It's revenue-based financing: access and repayment are tied to your business's revenue flow, not a fixed credit facility governed by the same terms as a bank product. That distinction matters, so we're precise about it rather than blurring it for marketing purposes.

Where ByzFlex is the right fit: you've got real, provable revenue — job draws clearing, invoices paid, a bank account that shows money moving — but your credit profile, time in business, or lack of hard collateral keeps you out of a bank line or makes a traditional online LOC a slow maybe. Byzfunder underwrites primarily on business performance, not a credit-committee model, and funding can happen same-day to 24 hours once you're approved.

Where it's not the right fit: if you can qualify for a bank line of credit at a lower cost and don't need capital urgently, take the bank line. Revenue-based revolving capital is priced for speed and accessibility, not for being the cheapest possible option on the market. If that's your situation, you can apply to ByzFlex directly and see real terms in minutes.

How draws, repayment, and renewal actually work

The mechanics differ enough between a true line of credit and ByzFlex that it's worth walking through both, since the word "draw" gets used loosely across the industry.

On a bank or online LOC: you're approved for a credit limit up front. When you need cash — say, a $15,000 materials order for a job that starts before the first pay application is even submitted — you draw that amount from the line. Interest accrues only on the $15,000 you drew, not your full limit. You repay on the lender's schedule (often weekly for online lenders, monthly for banks), and as you repay principal, that capacity becomes available to draw again. A well-managed line can be reused indefinitely without reapplying, as long as you stay current and the lender doesn't reduce your limit at renewal.

On ByzFlex: the mechanics are built to feel similar from the contractor's seat — you access available capital, use it, and as your business generates revenue, capacity replenishes so you can draw again. But underneath, it's structured as revenue-based revolving capital, not a credit line governed by lending law the way a bank LOC is. Repayment is tied to your revenue flow rather than a fixed installment schedule set independently of how the business is actually performing. For a contractor with lumpy, job-dependent cash flow, that revenue-linked structure can flex better with a slow month than a fixed weekly LOC payment does — but it's a different product, priced and structured differently, and you should evaluate it as such rather than assuming it behaves exactly like a bank line with different branding.

One practical point that applies to every option on this page: a facility you don't draw doesn't cost you anything on a true revolving product (aside from any maintenance or unused-line fee some banks charge). That's part of why contractors line one up before they need it — apply and get approved while the business is stable, so the capacity is already there the next time a GC sits on a pay application for 60 days instead of 30.

How to qualify for a construction line of credit (or ByzFlex)

Whether you're applying to a bank, an online lender, or Byzfunder, the underlying signals reviewers look for are similar. Have these ready:

• Time in business — most lenders want 6 months to 2 years minimum; banks generally want 2+
• Revenue documentation — 3-6 months of business bank statements showing consistent deposits
• Credit profile — personal and/or business credit score (varies widely by lender; ByzFlex works with FICO 525+)
• Business bank account — active, in the business's name, not a personal account doubling as the operating account
• Entity documentation — business license, EIN, articles of organization/incorporation
• A clear use case — knowing what the draw is for (materials, payroll gap, retainage bridge) speeds underwriting and helps you size the facility correctly
• No open bankruptcy or major recent derogatory marks — most lenders, ByzFlex included, will decline an open bankruptcy

If you're a GC, a sub, or a specialty-trade contractor — electrical, plumbing, HVAC, concrete, roofing, excavation — who's been in business over a year, pulling in $20K+ a month, and US-based, you likely clear ByzFlex's baseline even if a bank already said no.

Pros and cons of each path

The gap isn't a lack of revenue — it's the 50-plus days between doing the work and getting paid for it.

Byzfunder underwriting team, on why revenue-based revolving capital fits contractors

Bottom line

A construction line of credit is a real, useful tool — draw as needed, repay, draw again, built for the pay-application gap every contractor lives with. Banks offer the cheapest version but the strictest bar. Bluevine, Fundbox, and OnDeck lower that bar with faster online underwriting, at a higher cost. If your credit or time in business keeps you out of all three, or you need capital faster than any of them can move, ByzFlex gives you revenue-based revolving capital that acts like a line of credit without being underwritten as one — approved off what your business actually brings in, not just a credit file.

FAQ

Is a construction line of credit the same as ByzFlex?

No. A line of credit is a specific, regulated credit product typically issued by banks or online lenders. ByzFlex is revenue-based revolving capital — it functions similarly for the contractor drawing on it (access funds, repay, draw again) but is structured differently and underwritten primarily on business revenue rather than credit history.

How much can a contractor typically get on a line of credit?

It varies widely by lender and business profile — bank lines can range from $25,000 to $500,000+ for established contractors with strong financials; online lenders like Bluevine and Fundbox typically offer smaller limits, often in the $10,000-$250,000 range depending on revenue and credit.

Can I get a construction line of credit with bad credit?

Traditional bank lines generally require good to strong credit (often 680+). Online lenders like Fundbox and Bluevine have lower thresholds (roughly 600-625+). ByzFlex is built for contractors with FICO scores as low as 525, since underwriting weighs revenue and cash flow more heavily than the credit score alone.

What can a contractor use a line of credit for?

Common uses include buying materials before a draw is approved, covering payroll during the gap between pay applications, bridging retainage held on a completed job, and smoothing cash flow across multiple jobs on different billing schedules.

Why do banks decline construction businesses for credit lines?

Construction revenue is job-to-job and can look volatile on paper even when the business is healthy, and many contractors lack the hard collateral banks want for a line of credit. Federal Reserve survey data shows even full bank approval rates across all industries hover around 57% at small banks — construction faces additional scrutiny on top of that baseline.

How fast can I get funded through ByzFlex versus a bank line?

Bank lines commonly take several weeks from application to funding due to full underwriting and committee approval. ByzFlex is built for speed — funding can happen same-day to within 24 hours once you're approved, since underwriting runs primarily off business bank data rather than a full credit-committee process.

Does a line of credit hurt my credit score?

Applying typically involves a credit inquiry, which can cause a small, temporary dip. Carrying a high balance relative to your limit (high utilization) can also affect your score over time, similar to a credit card. ByzFlex, since it's not a traditional revolving credit line, is evaluated and reported differently — ask your Byzfunder rep for specifics tied to your file.

What's the difference between a line of credit and an MCA?

A line of credit is revolving credit you draw against and repay with interest. An MCA (merchant cash advance) is not a loan — it's a purchase of a portion of your future receivables at a fixed factor rate, repaid via a fixed percentage of daily or weekly revenue. Byzfunder offers both MCA and ByzFlex; which fits depends on whether you want revolving access (ByzFlex) or a lump sum against future receivables (MCA). See our MCA vs. business line of credit breakdown for the full comparison.

Related reading:

• Construction business loans: what's actually available
• Best AI tools for construction crews
• MCA vs. business line of credit
• Revenue-based financing explained
• Working capital business loans