Civil engineering stocks: the one 10/10 pick of a forgotten sector

2026-06-16 · By Lubin Danilo, founder of Lubin Investment

In the engineering and construction sector, only one stock passes all my quality criteria in June 2026: Comfort Systems USA (FIX). Revenue growth of 30% a year over five years, Cash ROCE of 94.1%, and a high valuation at 51 times its annual cash. The market recognises the quality, but is it justified?

• Comfort Systems USA (FIX) is the only engineering and construction stock to score 10/10 in my screener in June 2026.
• Its figures are among the most impressive in the screener across all sectors: Cash ROCE 94.1%, revenue growth 30.1%/yr, FCF per share growth 57.4%/yr.
• The valuation at 51 times annual cash is high and reflects market expectations around data center demand and US infrastructure.
• FIX's moat rests on the scarcity of trained MEP electricians and technicians: a competitive advantage that is very hard to replicate.
• The question is not whether FIX is a great company, but whether its current price leaves enough margin of safety.

Why engineering and construction is ignored by individual investors

I understand why. When you think of the big investment themes of 2025-2026, you think of artificial intelligence, healthcare, semiconductors. Not companies laying electrical cables inside data centers. Yet that is sometimes where the best surprises are found.

The engineering and construction sector suffers from three prejudices: thin margins, violent cycles, and growth dependent on public contracts. That is not wrong for most of the sector. But Comfort Systems USA is not a general contractor. It is a company that has positioned itself on high-value building systems work: electrical, mechanical, HVAC (heating, ventilation, air conditioning). What I found when I dug into the numbers genuinely surprised me.

What Comfort Systems USA (FIX) does: the business explained

Comfort Systems USA installs, maintains and upgrades mechanical, electrical and plumbing (MEP) systems in commercial and industrial buildings across the United States. In concrete terms: if you are building a data center, a hospital, a semiconductor fab or an office building, you need someone to install the electrical system, the air conditioning, the ventilation, the industrial plumbing. That is Comfort Systems.

This positioning is critical. The data center market is exploding. Demand for computing centers for AI, cloud, and 5G is structurally rising. Data centers are very MEP-intensive: they consume enormous amounts of electricity and generate colossal heat that must be dissipated. Comfort Systems has positioned itself as a reference provider on this segment.

The moat: why this is hard to copy

A moat, the competitive advantage, is what prevents rivals from taking a company's place. For a service company like FIX, the moat rests first on people. MEP-specialised electricians and technicians are scarce and take years to train. A subcontractor's reputation is built contract by contract. You do not displace Comfort Systems from a data center client by making a better commercial offer: you first need to have trained teams and a reference track record.

FIX operates through many regional subsidiaries, each with a strong local presence. This decentralised model allows it to respond very quickly to local needs while benefiting from group-level economies of scale in purchasing and recruiting. The 51% organic growth mentioned in recent results illustrates demand that is overflowing capacity. And a record order book provides rare visibility in this sector.

The numbers that stand out

FIX's Cash ROCE is 94.1%. Cash ROCE (Cash Return on Capital Employed) measures how much cash the company generates for every dollar of capital it employs in the business. A Cash ROCE of 94.1% means that for every 100 dollars of invested capital, FIX generates 94.1 dollars in cash. That is exceptional. By comparison, a good software company often runs around 30 to 50%. A typical construction company would be below 10%.

Revenue growth is 30.1% a year over 5 years. Again, for a construction company, that is remarkable. Free cash flow per share growth is even stronger: 57.4% a year over 5 years. This divergence between revenue growth and cash growth signals that FIX is expanding its margins while it grows. The current FCF margin is 13.3%: for every 100 dollars of work completed, 13.3 dollars remain as free cash.

The valuation at 51 times cash: justified or excessive?

That is the real question. A P/FCF of 51 times annual cash is high. My screener signals an overvaluation of about 27.2% versus my reasonable buy price of 1,421 dollars. That is not trivial.

Here is the market's reasoning, which I understand: if FIX maintains 30% annual growth for another 3 to 4 years (which the record order book and data center demand make plausible), its annual cash doubles or triples. The current P/FCF would then look much lower in hindsight. The market is paying in advance for future growth. That is a consistent bet given current fundamentals.

But this bet has a limit. If data center construction slows (financing crisis, cloud market saturation, AI spending inflection), if rivals manage to poach FIX's trained technicians, or if margins compress under wage cost pressure, the current P/FCF would become excessive. That is why I watch FIX closely without having bought it at this price. My entry price is below the current level.

The macro context supporting FIX in 2026

The United States is investing heavily in its infrastructure. The Infrastructure Investment and Jobs Act and the CHIPS Act have triggered billions in spending on semiconductor fabs, energy grids and data centers. These projects need companies like Comfort Systems to be physically built. Demand is not cyclical: it is a multi-year structural trend.

The recent quarter mentions over 375 million dollars in quarterly cash flow and a record order book. That is not an anecdote. It is the financial translation of demand that is overflowing the sector's execution capacity.

What I take from this

FIX is a rare company: a specialised contractor displaying profitability metrics worthy of a software publisher. Quality is unquestionable by my criteria. The current valuation reflects high expectations that the fundamentals make credible, but that leave little margin for error. I watch it closely. If the price falls enough to create a gap from my reasonable buy price, it will be a first-tier case to consider.

If you want to see the full FIX profile with all 10 criteria evaluated one by one and my updated price target, it is on my screener.

FAQ

What is Cash ROCE and why is 94% so high?

Cash ROCE (Cash Return on Capital Employed) measures the cash generated for every dollar of capital invested in the business. A rate of 94% means FIX generates almost as much cash as the capital it employs each year. A good industrial company typically runs around 15 to 25%. That is what separates an exceptional business from an ordinary one.

Why is FIX the only engineering and construction stock to score 10/10?

Because the engineering and construction sector is mostly made up of low-margin, highly leveraged companies dependent on public procurement cycles. FIX has differentiated itself through specialisation (MEP systems), decentralised management and positioning on high-demand markets like data centers.

Is a P/FCF of 51x not too expensive?

It is above my usual buy threshold. My model signals about 27% overvaluation versus my reasonable price. That does not mean FIX will fall, but that the margin of safety is thin. If growth holds over the coming years, today's buyer will be well rewarded. If it disappoints, they are overpaying.

What is the connection between data centers and Comfort Systems?

Data centers are very MEP-intensive (electricity, cooling, ventilation). A large data center can require as much electrical infrastructure as a hospital. Comfort Systems is one of the leaders in installing these systems in the United States, making it a direct beneficiary of the explosion in AI and cloud investment.

What is the moat of a construction services company?

In specialised services like FIX, the moat comes mainly from human capital: technicians trained over years, client relationships built across dozens of projects, solid regional reputation. That is hard to reproduce quickly, even with a lot of money.

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About the author

Written by Lubin Danilo, founder of Lubin Investment. A self-taught individual investor, I have analyzed stocks through their fundamentals for several years and invest my own money with this method. I codified it into a tool that judges a company's quality and its price separately, using criteria drawn from the financial literature (Warren Buffett, Michael Mauboussin, Aswath Damodaran).