Beyond the 10% Rule: What Surety Underwriters Really Want from Construction Contractors

By Wade L Carpenter, CPA, CGMA | November 16, 2021

Ever wonder why your competitor landed that massive bond with seemingly weaker financials than yours? Or why that “magic” 10% net worth rule seems to bend like a wet 2×4 for some contractors while others get hammered by it?

Here’s the truth: surety underwriting isn’t some black box formula where you plug in numbers and get an automatic yes or no. It’s more like building a house — the foundation (your financials) matters, but so does the framing (your experience), the electrical (your team), and whether the inspector (underwriter) trusts you won’t burn the place down.

After seeing contractors chase all the wrong metrics for years, let me pull back the curtain on what surety underwriters actually care about. Spoiler alert: it’s not just about hitting some arbitrary percentage.

Stop Chasing Revenue — Start Building Real Wealth

I watched a successful contractor make the classic mistake last year. This guy was banking $4 million annually on $35 million in revenue — a solid 11% net margin that would make any CFO jealous. But then the ego bug bit him.

“Wade,” he said, “I want to hit $100 million in revenue.”

“Why?” I asked.

“Because it sounds impressive.”

That’s like saying you want to frame more walls per day instead of building better houses. Pure ego.

Fast-forward 18 months: he hit his $100 million target. Know what else he hit? Break-even. Zero profit. All that extra revenue came with exponentially more headaches — bigger crews he couldn’t manage, projects outside his sweet spot, cash flow that looked like a roller coaster designed by a drunk engineer.

Here’s the back-of-the-napkin math that’ll make you rethink everything:

  • At $35M revenue with 11% margins: $3.85M in the bank
  • At $100M revenue with 0% margins: $0 in the bank
  • Net wealth creation difference: You just worked three times harder to make $3.85 million less

Underwriters see this train wreck coming a mile away. They’d rather bond a disciplined $20 million contractor who consistently banks 12% than a chaotic $100 million operation that’s one bad job away from Chapter 11.

Revenue goals create problems. Profit goals create freedom. Smart underwriters know the difference.

The Real Rules: It’s Not Just About the Numbers

Every contractor’s heard the “rules”: 10% net worth to aggregate bonding, 5% working capital to revenue, debt-to-equity ratios that sound like they came from some MBA textbook written by someone who’s never operated a jackhammer.

Here’s what those rules really are: starting points for conversation, not concrete barriers.

I’ve seen a $30 million bond get approved for a contractor with less than $1 million in equity. Impossible? Not if you know how creative underwriting actually works.

The underwriter looked past the balance sheet and saw:

  • Twenty years of steady performance in the same market
  • Iron-clad payment terms with creditworthy customers
  • A project where the materials were mostly owner-furnished
  • Cash flow protected by progress payment structures

They structured the deal with funds control, partial collateral, and payment protections. The contractor got bonded, completed the project profitably, and strengthened their balance sheet for future opportunities.

The rigid rules are for lazy underwriters. The good ones get “under the skin” of your business.

Your experience matters. Your contract terms matter. Whether you keep your word matters. A contractor with $5 million in equity and a history of delivering projects on time and on budget will get better treatment than a contractor with $10 million who’s had three claims in two years.

Character still counts in this business.

Stay in Your Lane — But Make It the Right Lane

The biggest disasters I see happen when contractors get “over their skis” in hot markets. It’s like watching a framer try to run electrical because “how hard can it be?”

Spoiler: pretty hard.

I know a guy who spent fifteen years building a solid residential and light commercial business. Consistent 10% margins, happy customers, steady growth. Then the industrial market heated up, and he saw dollar signs.

“Wade, there’s a $50 million chemical plant project. I can handle that, right?”

Wrong. Six months later, he was dealing with union issues he’d never seen, environmental regulations that read like ancient Sanskrit, and change orders that turned his 10% margin into a 15% loss.

The smart play? Follow the crawl-walk-run approach.

  • Crawl: Perfect your processes in your wheelhouse
  • Walk: Take on slightly bigger or more complex projects within your expertise
  • Run: Expand carefully into adjacent markets where your skills transfer

Your sweet spot isn’t just about project types. It includes:

  • Geography you know (local subs, permits, inspectors)
  • Contract sizes that match your cash flow capacity
  • Risk levels you can handle without losing sleep
  • Customer types that pay their bills

Contractors who stay disciplined in their lane consistently bank 10% net margins year after year. They sleep well at night, their crews stay busy, and underwriters love writing their bonds.

Those who chase every shiny opportunity? They’re the ones calling their CPA at 2 AM asking about cash flow loans.

Bad News Travels Fast — Good Communication Travels Faster

Here’s a construction truth: problems happen. Equipment breaks, weather delays projects, owners change their minds, subs disappear faster than donuts in the break room.

The question isn’t whether you’ll face challenges — it’s how you handle them when they show up.

When trouble hits a bonded project, your surety should be the second call you make (right after your CPA). They’re not the enemy waiting to pounce on your mistakes. They’re part of your success team, and they’ve seen every problem you’re facing before.

I watched a contractor save his business by making that call early. A major sub defaulted halfway through a $15 million project. Instead of hiding and hoping, he immediately called his underwriter.

“We’ve got a problem,” he said. “Here’s what happened, here’s what I’m doing about it, and here’s what I need from you.”

Within 48 hours, the surety helped arrange replacement subs, provided cash flow support, and structured a completion plan. The project finished on time, and the relationship got stronger.

Compare that to the contractor who tried to hide a similar problem. By the time the surety found out (they always do), the project was three months behind and $2 million over budget. The surety had to step in, the contractor’s program got canceled, and his bonding capacity disappeared.

Your financial statements are like project progress reports — late delivery signals trouble. Getting your year-end financials to your underwriter by March shows you’re on top of your business. Delivering them in August with excuses signals you’re probably on top of a mess.

Transparency builds trust. Secrecy destroys it.

Build Your Championship Team

The best contractors I know don’t try to go it alone. They build championship teams with the right players in the right positions:

  • CPA: Keeps the books clean and the tax strategies sharp
  • Bonding agent: Knows which underwriters fit your business model
  • Banker: Provides working capital when cash flow gets tight
  • Attorney: Handles contracts and keeps you out of legal quicksand
  • Surety underwriter: Partners with you for long-term growth

Here’s what most contractors miss: these people should know each other and work together.

Your CPA should understand what your underwriter needs for year-end packages. Your banker should coordinate with your surety on credit decisions. Your attorney should draft contracts that make your bonding agent’s job easier.

I’ve seen contractors save weeks of back-and-forth just by getting their team in the same room for an annual planning session. Everyone understands the business strategy, the cash flow requirements, and what success looks like for the coming year.

Meet with your underwriter at least annually — preferably face-to-face. These relationships matter when you need creative solutions or when something goes sideways. A handshake and eye contact still carry weight in the construction business.

Character and keeping your word matter as much as financial metrics. Your underwriter wants to sleep well at night knowing their bonds are backed by contractors who deliver what they promise.

The bottom line? Surety underwriting isn’t about perfect balance sheets or hitting arbitrary ratios. It’s about building trusted relationships with contractors who stay disciplined in their profitable lane, communicate openly about challenges, and focus on steady profit retention rather than ego-driven revenue growth.

The 10% rule is just the starting line, not the finish line. The real conversation begins when your underwriter sees a contractor worth betting on for the long haul.

Ready to build better relationships with your surety team? Listen to the full episode of the Contractor Success Forum at https://contractorsuccessforum.com/ or subscribe on YouTube, Spotify, or Apple Podcasts. For more insights on construction financial management, visit https://carpentercpas.com or book a discovery call to discuss how we help contractors build more profitable businesses.