Evan Brown

Evan Brown runs Rebar, a New York company that has set out to do something the software industry mostly skipped: build serious tools for the people who install the heating, cooling, wiring and plumbing that keep buildings alive.

Rebar's product is a vertical artificial-intelligence platform. Feed it the documents that arrive with every construction job - blueprints, spec books, plan sets - and it reads them the way a seasoned estimator would, pulling tens of thousands of data points out of each project. The work of scoping a bid, which has traditionally eaten hours or full days, collapses into minutes. Brown says the quotes come out 60 to 70 percent faster than they would by hand, and early customers report their win rates climbing.

That is the pitch, and in March 2026 investors bought it. Rebar closed a $14 million Series A led by Prudence, an early-stage firm that backs vertical-AI companies aimed at the built world. Zero Infinity Partners, Founder Collective, Villain Capital and Optimist Ventures joined the round. The company was only about eighteen months old.

The money is meant to widen the platform. Rebar started with takeoffs - the line-by-line counting of equipment and materials off a set of plans - and intends to move into spec review, submittals and bid management. Beyond HVAC, Brown wants to reach into electrical and plumbing, and to push into new regions in the United States and abroad.

What makes Brown credible here is that he did the job before he tried to replace it. He grew up spending time in his uncle's commercial HVAC supplier office, where he watched estimators burn full weeks on quotes that felt like they should take hours. The problem lodged in his head early.

It never left. Later he spent more than five years as an estimator and sales engineer at Johnson Barrow, part of DMG Corp., working with contractors, engineers and manufacturers to design, sell and support HVAC systems for supplier offices around the country. He lived inside the exact workflow Rebar now automates.

"I spent over five years in the space focused on designing and selling HVAC equipment and doing the manual process that we're solving at Rebar many times," Brown has said. "I've looked and built inventory lists off of a plan set by printing out blueprints, highlighters and rulers."

His route into technology ran through Ambient Enterprises, where he led research into AI implementation - specifically visual search for HVAC takeoff software. That was where the idea stopped being a complaint and started becoming a company.

Brown's strategic argument is contrarian in a market crowded with general-purpose tools. Most companies, he says, either aim at other trades or try to cover all of them at once - which, in his telling, means they serve none of them well. Rebar goes the other direction: pick HVAC, learn it cold, then expand.

"Most companies either concentrate on other trades or try to cover all of them at once, which ultimately means they serve none particularly well," Brown has said. "Rebar takes the opposite approach."

The wager is that a model trained narrowly - on millions of HVAC blueprints, mirroring how estimators actually think - beats a broad model that knows a little about everything. Depth as a moat.

The founding itself followed the same discipline. Brown teamed up with Andrew Schwartz, now Rebar's chief product officer, in October 2024. Before building much of anything, the two talked to thousands of operators across the country to figure out where technology could do the most good. Takeoffs won that contest, and everything else on the roadmap flows from it.

There is a quiet signal in Rebar's early customer list. Of roughly forty customers, seven became investors. When the people who use a product every day decide they also want to own a piece of it, that tends to say more than any deck.

Brown frames the payoff for customers in plain terms: "If you're able to increase your volume and build more proposals, the opportunity to win projects goes higher."