I was looking over some numbers from a masonry sub today and I swear some of these guys just make it up as they go. I had a quote come in for a simple retaining wall and the numbers just didn't add up at all. It was like they took the square footage, multiplied it by thier phone number, and then added a random "becasue I can" fee at the bottom. I get that material costs are jumping around and labor isn't cheap, but some of these bids look like they were calculated using some secret math I never learned in school. I had one guy basially add his line items side-by-side instead of acutally totaling them up. It makes you wonder if they're actually crunching numbers or if they just throw a dart at a board and hope the GC is too busy to check the math. Do you guys actually sit there and audit every single line item or do you just give up and pass the cost along to the client if the total feels "close enugh"? I'm tired of feeling like I need a degree in cryptography just to figure out why a three-day job is suddenly costing as much as a new truck.
Is it just me or is subcontractor math basically just creative writing at this point?
May 08, 2026
Last reply: 2 months ago
4 Replies
I’ve seen this play out a hundred times where a sub hands over a bid that looks like it was written on a napkin after four beers. Most of the time, they aren't actualy using a calculator; they’re pricing the **hassle factor** and the opportunity cost of not being on a bigger job. If a mason is busy, he’s going to throw a number at you that makes it worth his while to skip a more profitable project. If you say yes, he wins big; if you say no, he didn't really want the work anyway. The "secret math" usually comes down to a few hidden buffers. They’ll pad the block count by 15% for waste, then mark up the materials by 200% or 300% to cover the delivery and the back-breaking labor of staging. Then they add a flat daily rate for the crew that prolly includes a buffer for whenever the site conditions aren't perfect. If the math looks broken, it’s often becasue they started with the total they wanted to make and worked backward to fill in the lines.
I always audit the **quantities** first. Forget the labor cost for a second and just check the square footage and the tonnage of stone or block they’re claiming. If their material count is way off, the whole bid is trash. I don't just pass the cost along because it makes me look incompetent to the client when a savvy owner starts asking why a 40-foot wall costs more than a mid-sized sedan. If you want a real number, you have to force them into a **unit price** agreement. Tell them you’ll pay a specific amount per block or per square foot of face. That usually clears up the confusion real fast. If they refuse to break it down that way, they’re almost certainly just throwing darts at a board and hoping you’re too slammed to notice the spread.
That unit price idea sounds smart, but how do you actually figure out what a 'fair' unit price is when you're just starting? I’m worried if I come at a sub with a specific number per block, I’ll look like an idiot if my math is way off or if I’m lowballing them by accident.
Does asking for that breakdown usally make these guys defensive? I don't want to get blacklisted by the local crews for being 'that guy' who over-analyzes everythign, but I also don't want to pay for a new truck every time I need a few blocks stacked.
Don't sweat the blacklisting. The guys who get defensive are usually the ones who don't acutally know thier own overhead and are just guessing based on how much they need for a truck payment. Real outfits respect a GC who knows the numbers.
To get a baseline for unit prices, go talk to the guys at the local masonry supply yard. They see the invoices and know the going labor rates better than anyone. If you walk in with a number based on actual local data, they'll realize you aren't a greenhorn they can fleece. If they still won't play ball, you've just filtered out a future headache.
Watch out for those "mobilization" or "delivery" line items too. I’ve seen guys try to sneak in a $2k fee just to move a skid steer three miles down the road. It’s basicly a tax for not having your own gear. If the bid is a total mess, I usually just send a quick text saying the math isn’t mathing and ask for a revision. If they’re serious about the work, they’ll usually "find an error" and drop the price by a grand or two within the hour. If they ghost you, they were just fishing for a sucker anyway.
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