Public Contractor Valuation: A Historical 15x-34x Snapshot vs. Private 4x-8x Planning

Public Comparables Are Reference Points

When a PE firm sits down to value your $10M mechanical contracting business, they don't start with your QuickBooks. They start with five public companies.

Comfort Systems USA. EMCOR Group. APi Group. Limbach Holdings. IES Holdings.

These are the largest publicly traded specialty contractors in the U.S. Their trading valuations are reference points buyers may consider; they do not mechanically set every private-company offer or an industry ceiling.

The table combines verified fiscal-2025 revenue and rounded EBITDA margins with an earlier EV/EBITDA snapshot whose price date, enterprise-value inputs and denominator were not recorded. The multiple column is retained as a historical, unreproduced reference, not today's quote. A 10-K alone cannot establish a live trading multiple.

Earnings basis: FIX 16.0%, IESC 13.0%, APG 13.2% and LMB 12.6% use issuer-adjusted, non-GAAP EBITDA. IES fiscal year ends September 30, 2025; the other four December 31, 2025. EMCOR 11.2% is Level-calculated operating income plus operating D&A and acquired-intangible amortization, including a UK-disposal gain; removing that gain alone gives about 10.3%, not issuer-adjusted EBITDA. These are heterogeneous definitions and are not standardized cash margins. The old EV ratios' EBITDA denominator is not recorded, so it cannot be assumed to match the displayed margin basis.

Reproduce the related annual cash/equity inputs in the public-company data download. That dataset validates its own raw inputs and formulas; it does not reproduce the historical EV ratios above.

The median of these five historical multiple entries is 19.7x. The highest retained historical entry is Comfort Systems at 33.9x; its price date and EBITDA denominator are unreproduced.

The 4-8x adjusted-EBITDA band is an illustrative private-company planning range, not a quote or verified transaction median.

The comparison only becomes meaningful after matching the earnings definition, date and business model. And understanding the math is the first step to improving your number.

What Drives the Gap

The difference between 20x and 5x isn't just size. It's six specific factors that PE firms explicitly price:

1. Recurring Revenue Mix

APi's Q4 2025 issuer presentation, page 7, reports inspection, service and monitoring at 54% of FY2025 revenue versus 40% in 2021. Its 2025 annual report describes strengthening a "protective moat" around the business; that is management's interpretation. The historical table records ~19.7x; that observation does not measure the premium caused by service mix.

A project-heavy contractor with no service agreements might get 4-5x. Recurring-revenue predictability is one underwriting factor to test alongside profitability, concentration and management continuity. This selection does not rank their valuation effects.

2. Scale and Diversification

Comfort Systems operates across 170+ locations. EMCOR has 44,000 employees across electrical, mechanical, building services, and industrial segments. If one branch has a bad quarter, it doesn't matter.

If your $10M business loses its biggest customer, the one who represents 30% of revenue, it's existential.

3. Liquidity Premium

Public company shares trade instantly. Selling a private contracting business takes 6-18 months, involves lawyers, accountants, and a buyer who may walk at the last minute. Buyers pay more for the ability to exit quickly.

4. Financial Reporting Quality

Every company on this list has audited GAAP financials, detailed segment reporting, and clean backlog data. A smaller contractor may have cash-basis or incomplete job reports; a buyer checks the actual records rather than inferring quality from the software name. PE discounts for uncertainty, and they should.

5. Management Depth

Can your business run without you for 90 days? If the answer is no, the multiple drops. Public companies have deep management benches by definition. Owner-dependence is a risk to test through replacement responsibilities, customer relationships and decision authority; this selection does not rank its valuation discount against other factors.

6. Customer Concentration

EMCOR spreads risk across thousands of customers and dozens of markets. If one GC represents 30% of your revenue, that is a buyer diligence question. A 10-20% haircut is an illustrative sensitivity, not a measured universal discount.

The Valuation Bridge

Here's how the math actually works, from public multiples down to your exit number:

The gap between each tier is where value gets created, or destroyed.

Multiple Arbitrage: Why PE Keeps Buying

This is the mechanic driving the wave of PE-backed contractor roll-ups over the last few years.

PE buys your company at 5-6x EBITDA. They bolt it onto a platform with better systems and management. They exit the combined entity at 10-12x.

Your $1M in EBITDA at 5x is worth $5M standalone. Inside a platform valued at 10x, that same EBITDA is worth $10M. The value creation isn't magic. It's the gap between private contractor multiples and platform multiples.

In this example, at a 5x-to-10x spread, each dollar of your EBITDA becomes worth roughly twice as much inside the right platform.

What You Can Actually Control

You can't become a $9B public company. But you can close the gap within your tier. For the private-market brackets in your own trade, tuck-in versus regional platform versus national platform, plus how a buyer tests each lever below in diligence, see the contractor valuation multiples benchmark covering 13 trades. Read each range's source and limitations; a page reference does not certify every offer or earnings basis.

Illustrative 4x-to-7x sensitivity: factors a buyer may test:

• Building a service agreement book (recurring revenue)
• Reducing customer concentration below 15% for any single account
• Getting clean accrual-basis financials with real job costing
• Building a management team that can run without you
• Documenting your backlog with signed contracts

Illustrative 7x-to-10x sensitivity: additional platform considerations:

• Hitting $15M+ revenue with consistent growth
• Running 50%+ service/maintenance revenue mix
• Having audit-ready financials and detailed segment reporting
• Demonstrating 3+ years of margin stability
• Operating in high-demand end markets (data centers, healthcare, semiconductor)

The Data Center Premium

Comfort Systems has the highest retained historical entry in this group, ~34x. Its data-center and semiconductor exposure is operating context, not an identified cause of that multiple. IES Holdings is right behind at ~20x, also riding data center and communications infrastructure demand. Most of these companies have called out data center demand as a growth driver on recent earnings calls.

If you're an electrical or mechanical contractor doing data center work, you're in the hottest end market in contracting. A 1-2x uplift is a valuation-sensitivity assumption, not an independently measured premium for data-center exposure. A buyer still tests repeatability, capacity, concentration and contract terms.

The private-company lesson is not just "chase data centers." It is to prove the field capacity buyers are paying for. We break that down in the technician labor multiple: gross profit per scarce senior technician hour, crew execution by task type, and apprentice-to-journeyman conversion.

The Full Picture

We track all five of these companies, their financials, operating metrics, M&A activity, and earnings themes, in the Level Market Monitor. Each edition states its financial period and actual review date, with SEC filings and the relevant earnings definitions.

If you want to understand what PE sees when they look at your books, and how to close the gap between where you are and where these companies trade, that's what we do.

For the communication layer behind those multiples, see what public contractor CFOs say that private operators ignore: backlog quality, service mix, labor capacity, cash conversion, and margin durability.

For where private multiples land trade by trade, the Trade Economy Index tracks what trade businesses actually sell for across 13 trades, scored against how exposed each trade is to AI.

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FAQ

Q: Why should a $10M contractor care about companies doing $9B or $17B in revenue?

Public contractors provide operating context for scale, service mix, labor capacity and reporting. A buyer may consider trading comparables alongside actual transactions and cash-flow analysis. Public multiples are neither a ceiling nor a floor for your private-company offer.

Q: What EBITDA multiple can a private contractor realistically expect?

It depends on size and quality. For consistency with the bridge, use these illustrative planning bases: under $5M owner-operated businesses, 2-5x SDE; $5-50M private contractors, 4-8x adjusted EBITDA; platform planning, 8-12x adjusted EBITDA. Revenue alone does not determine valuation, and these bands are not verified deal medians. The biggest drivers are recurring revenue percentage, customer concentration, management depth, and financial reporting quality.

Q: How often do public contractor valuations change?

Daily, they're publicly traded stocks. But the underlying financials that drive those valuations update quarterly (10-Q) and annually (10-K). Check the financial period and actual review date on the Level Market Monitor edition before relying on it.

Q: Is now a good time to sell a contracting business?

Fiscal-2025 year-end references are $11.9B Comfort Systems backlog and $13.3B EMCOR remaining performance obligations, not identical measures or current balances. Their definitions and later changes matter. Capstone reported a 9.5x average EV/EBITDA for its 2024-YTD 2026 HVAC transaction sample in the July 27, 2026 update. That sample average does not establish today's offer for your trade or company. Compare current matching transactions, buyer demand and your own exit alternatives before deciding when to sell.

Primary fiscal sources, reviewed October 7, 2026: Comfort Systems FY2025 10-K, EMCOR FY2025 10-K, IES FY2025 10-K, IES adjusted-EBITDA reconciliation, APi FY2025 10-K and Limbach FY2025 10-K. Public enterprise value changes with share price, share count, debt, cash and definition. Private enterprise value is also different from owner proceeds after debt, cash, working capital, fees and rollover terms.