I Got Tired of Guessing on Concrete Estimates — So I Built an App That Does It in 30 Seconds

Let me tell you something nobody talks about in this trade.

Every concrete contractor I know has lost money on a job because the estimate was off. Maybe the footing was deeper than you figured. Maybe you forgot to factor in waste on the rebar. Maybe you were doing math on the tailgate of your truck at 6 AM and the decimal was in the wrong spot.

I've been pouring concrete for 35 years. I've built foundations, walls, slabs, stairs — you name it. And for most of that time, I estimated the same way everyone else does: spreadsheets, napkin math, or just gut feel and hoping it works out.

Here's the problem with gut feel: it doesn't pay the bills when you're short two yards of concrete and the pump truck is already on site.

The Breaking Point

I remember the job that broke me. Not physically — mentally. I'd spent an hour pricing out a foundation, double-checking my volumes, cross-referencing material costs. Got to the site, realized I'd miscalculated the wall ties and was short on rebar. Had to make an emergency run to the supplier, lost half a day, ate the cost, and still had the homeowner asking why we were behind schedule.

That night I thought: there has to be a better way.

I looked at what was out there. The big-name software? Thousands of dollars a year. Built for office guys in hard hats they bought at Home Depot. Not for guys like me who are actually on the slab. And half of them don't even have a built-in concrete calculator — you're still doing the math yourself and plugging numbers into their system.

So I did what any stubborn contractor would do. I built my own.

What Started on a Google Sheet Became Something Real

It started as a messy spreadsheet. Formulas for footings, walls, slabs. Then I added stairs. Then curved walls. Then rebar calculations with proper waste factors. Then it outgrew the spreadsheet entirely.

I taught myself to code. Not at a bootcamp. Not at a university. Late at night after long days on the job site, covered in concrete dust, watching tutorials and writing code until it worked.

That spreadsheet became ProBuilder — a full estimating platform built by a contractor, for contractors. Over 16 types of calculations. A CAD takeoff tool. A 3D foundation visualizer so you can actually see what you're building before you pour. Invoice and contract generation. Even a voice assistant so you can dictate measurements hands-free when you're standing in a hole with dirty gloves on.

Why I'm Telling You This

Not to brag. To make a point.

The trades industry is full of guys and girls who are brilliant at what they do but getting crushed by the business side. You can form a perfect wall but if your estimate was off by 15%, you just worked for free. Or worse — you lost money.

The tools that exist either cost a fortune or they're built by people who've never set a form in their life. They don't think about the fact that you need metric AND imperial because you've got a job in Ontario on Monday and a quote for a US client on Tuesday. They don't think about the guy on site who needs an answer in 10 seconds, not 10 minutes of navigating menus.

I built ProBuilder because I needed it. And now every contractor who's tired of bleeding money on bad estimates can use it too.

The Real "AI Business Hack"

You've probably seen those posts online — "Use AI to build a business in 24 hours!" with a list of generic prompts. Copy, paste, instant empire.

That's not how it works. Not even close.

What actually works is this: know your trade inside and out, identify the problem that's costing you and everyone around you real money, and build something that actually solves it. AI is a tool — a powerful one — but it's only as good as the person using it. And the person using it better know the problem firsthand.

I didn't copy-paste my way to a SaaS platform. I built it one calculation at a time, tested it on real jobs, broke it, fixed it, and made it better. That's the hack. There is no hack. It's just work — applied in the right direction.

Try It Yourself

If you're a contractor still estimating on paper, spreadsheets, or gut instinct — give ProBuilder a shot. It's priced for real tradespeople, not corporate budgets. It works on your phone. It works offline. And it was built by someone who's poured more concrete than code.