Avoiding Commercial Project Underbids

- Been there more times than I can count.
- Last winter, we bid a flat roof on a 60s warehouse. Used infrared scans, drones, the whole deal - still missed a big section where the deck was basically mulch under the old mod bit.
- I’m convinced you just can’t catch everything, especially with these older commercial roofs.
- Now I always add a line in the bid for “hidden conditions” and make sure the client knows surprises are likely.
- Sometimes I’ll even bring them up on the roof and poke around together before demo, just so there’s no shock later.
- Drones and cameras help, but nothing beats actually pulling up a few test cuts if you can swing it.
- Anyone else find that city codes don’t always match up with what’s actually up there? Had inspectors tell me decking was fine when it clearly wasn’t...
- Guess at the end of the day, you just have to budget for unknowns and be upfront about it.

City codes and what’s actually up there - don’t even get me started. I’ve had inspectors sign off on stuff that made me nervous just to walk across. I always tell folks: if you can, pull a couple of test cuts, even if it’s just a small section. Photos and scans are great, but nothing beats seeing the layers with your own eyes. And yeah, those “hidden conditions” clauses have saved my bacon more than once. Sometimes I feel like I’m just budgeting for surprises and hoping they’re not too wild.

That’s the truth about budgeting for surprises. I thought I was being super thorough on my last bathroom reno, but once I opened up the floor, I found a patchwork of old repairs - some of it looked like it was held together with hope and duct tape. The inspector didn’t even blink at it, but I sure did. Ended up redoing way more than planned, but at least now I know what’s under there.

I get what you mean about test cuts. I’ve started doing that too, even if it feels like overkill. It’s wild how different things can look just a few inches over. One spot in my kitchen ceiling was totally fine, but two feet away, the joist was half rotted from an ancient leak. If I’d just relied on the photos from the inspection, I would’ve missed it.

Those “hidden conditions” clauses are a lifesaver, but sometimes I wonder if they’re just a way for contractors to cover themselves when they underbid. Like, is it even possible to get a truly accurate estimate on these older places? Or is everyone just guessing and hoping nothing major pops up? I try to pad my own budget for “unknowns,” but it always feels like a shot in the dark.

Curious if anyone’s ever had a contractor actually come in *under* their original bid because things went smoother than expected. That’s never happened to me - maybe I’m just unlucky or maybe that’s just how these projects go...

- Totally relate to the “patchwork of old repairs” - I’ve seen roofs where every layer tells a different story.
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“is it even possible to get a truly accurate estimate on these older places?”

“is it even possible to get a truly accurate estimate on these older places?”

I’ve wondered the same thing. When I bought my place (built in 1927), I figured the roof would be “just shingles.” Nope - turned into a weird archaeological dig. There was a layer of ancient cedar shakes under two layers of asphalt, plus some kind of mystery flashing that crumbled if you looked at it wrong. The initial estimate was off by about 30% once they started tearing things off.

Hidden conditions clauses make sense, but yeah, sometimes it feels like they’re just bracing you for the inevitable “surprise” change order. I tried to get multiple bids, but honestly, every roofer had a different theory about what was up there.

Padding the budget is smart, but even then... sometimes it feels like rolling dice. I went with a contractor who did thermal imaging before quoting, which helped a bit - fewer surprises, but still not perfect.

I’d love to hear if anyone’s actually had an old roof project come in on target. For me, it’s always been “expect the unexpected.”

“every roofer had a different theory about what was up there.”

That’s been my experience too - one guy swore there’d be slate under the shingles, another said it’d be all rotted wood. Ended up being both wrong and right in weird ways. I’ve seen storm damage reveal stuff nobody expected, like old tar paper that just disintegrates. Has anyone tried those drone inspections before starting demo? Curious if that tech actually helps spot hidden layers or if it’s just another guess.

I’ve used drones a few times, mostly for big commercial jobs. They’re great for getting a bird’s-eye view and spotting obvious trouble spots, but honestly, they can’t see through layers. Still gotta budget for surprises once you start tearing things off. Sometimes it helps with documentation though, especially if you’re dealing with insurance or change orders.

Still gotta budget for surprises once you start tearing things off.

You nailed it there. No matter how many gadgets or tools you throw at a project, there’s always something hiding under the surface. I remember thinking I was set after getting a drone view of my old barn roof - looked fine from above, but once we started pulling off the metal, half the decking was rotted. Ended up costing a lot more than I’d hoped.

I do think drones are awesome for documenting stuff though, especially if you’re arguing with insurance or trying to show before-and-after shots. Makes a big difference when you’re dealing with paperwork and folks who’ve never actually seen the site.

Still, nothing beats setting aside a “just in case” fund. Surprises seem to be part of the deal, whether it’s commercial or just fixing up your own place. The tech helps, but it doesn’t have x-ray vision… yet.

- Totally agree about the “just in case” fund. I thought I was being smart with a detailed quote for my bathroom reno, but once they opened up the walls, turns out there was old water damage and some sketchy wiring. Ended up blowing my budget pretty fast.

- Drones are cool for pics, but yeah, they can’t see mold or hidden leaks. Kinda wish there was a gadget for that...

- Curious - has anyone ever had a contractor actually come in *under* their estimate? Or is that just a myth?

Curious - has anyone ever had a contractor actually come in *under* their estimate? Or is that just a myth?

Honestly, I’ve never seen it happen. Every job I’ve been on, there’s always something lurking - water damage, rotten wood, or just weird stuff behind the walls. Even when the quote seems detailed, stuff pops up and suddenly you’re talking change orders. Maybe if it’s a super simple job with no surprises, but in reality? Feels like underbids are pretty much unicorns.

Feels like underbids are pretty much unicorns.

- Had it happen once, but only by like $200. Not exactly life-changing.
- Usually, it’s the opposite - “surprise” costs for stuff I never saw coming.
- Even on my bathroom reno (tiny job), they found old pipes and boom, extra charges.
- I always pad my budget now. If it comes in under, I treat myself to takeout. Doesn’t happen much, though...

I get where you’re coming from, but I’ve actually seen a few legit underbids - usually when the contractor’s trying to fill a slow week or clear out leftover materials. That said, most of the time, it swings the other way. Hidden issues pop up, especially in older buildings. One thing I always tell folks: ask for a detailed scope of work and clarify what counts as “extra.” Surprises are less likely if you nail down those details up front... not foolproof, but it helps.

One thing I always tell folks: ask for a detailed scope of work and clarify what counts as “extra.” Surprises are less likely if you nail down those details up front... not foolproof, but it helps.

I get the logic behind locking down the scope and “extras” up front, but honestly, I’ve found that even the most detailed paperwork doesn’t always save you from headaches. Especially with commercial jobs - there’s just too much that can go sideways once walls start coming down or you get into the guts of an older building. I’ve had contractors swear up and down that their bid covered “everything,” only to hit me with a stack of change orders because they “couldn’t have known” about some ancient wiring or weird plumbing buried in the slab.

I’m not saying don’t get a detailed scope (you’d be nuts not to), but I think people put too much faith in paperwork. In my experience, the real trick is vetting the contractor’s track record with similar projects. If they’ve handled a bunch of 1950s office retrofits and didn’t nickel-and-dime their last three clients, that’s worth more than a 10-page contract. I’d rather pay a little more for someone who’s seen it all and won’t panic when the inevitable curveball comes.

Also, about those “legit underbids” - I’ve seen them too, but nine times out of ten, they come back to bite you. Either the contractor’s desperate for work and cuts corners, or they’re banking on making it up with extras. I had one guy lowball a lobby reno, then try to charge double for “unexpected” asbestos abatement. If the price looks too good to be true, it usually is.

Bottom line: paperwork helps, but trust and experience matter more. If you’re not sure about a bid, call their last client and ask how many surprises popped up. That’ll tell you more than any contract clause.

- Ran into this exact thing last summer on a strip mall remodel. Scope was crystal clear, but we opened up a wall and found old knob-and-tube wiring everywhere - nobody caught it on the walkthroughs.
- Ended up with three change orders, all “unforeseen.”
- I agree, paperwork sets the baseline, but you can’t predict every hidden issue, especially in older buildings.
- What’s helped me: always ask for references from jobs with similar surprises. If they handled those well, odds are better they’ll handle yours.
- Still, I’d rather have a detailed contract than nothing... but yeah, it’s not a magic shield.

That’s a classic scenario with older commercial spaces - no matter how thorough the initial walkthrough, there’s always something lurking behind the drywall. I’ve seen knob-and-tube pop up in places you’d never expect, and it’s tough to catch unless you’re opening things up or using thermal imaging (which isn’t always practical or cost-effective). Detailed contracts help, but like you said, they’re not a cure-all. I do think your point about checking references for similar surprises is underrated - past performance under pressure says a lot more than a polished bid ever will. Sometimes, you just have to budget for the unknowns and hope you don’t need it... but in these old buildings, odds are you will.

Man, you nailed it - old buildings are like a box of chocolates, except half the chocolates are full of asbestos or mystery wiring. I always tell folks: add a “surprise fund” to your bid, then cross your fingers. Last year, we opened up a roof and found an old skylight someone just shingled over... talk about a curveball. References matter, but nothing beats experience with these wild cards.

Couldn't agree more about the “surprise fund” - it’s saved me more than once. I’d add that a thorough pre-inspection with thermal imaging or endoscopes has caught a few hidden headaches for me, especially with old electrical runs. Still, nothing’s foolproof...

- Surprise fund’s definitely a must - mine’s bailed me out more than once when demo revealed “bonus” knob-and-tube.
- Pre-inspection with thermal imaging is smart, but I’ve had inspectors miss stuff behind old plaster walls.
- Ever run into issues where the pre-inspection actually made the bid go up way more than expected? Sometimes feels like you’re paying to find extra problems...

Ever run into issues where the pre-inspection actually made the bid go up way more than expected? Sometimes feels like you’re paying to find extra problems...

Yeah, I’ve seen that happen - almost like the more you look, the more you find, and suddenly your “budget” project is in the stratosphere. I get why folks want to catch stuff early, but sometimes it feels like inspectors are incentivized to find every possible thing, even stuff that might not be a real issue for years. Had a job last year where thermal imaging flagged “possible moisture intrusion” in three spots, but when we opened it up, only one was legit. Still, the client wanted all three fixed just in case, which added thousands.

I’m not saying skip inspections, but I do wonder if there’s a point where too much info actually hurts your ability to land a job or keep it profitable. Anyone ever try pushing back on inspection findings, or is that just asking for headaches down the line? Sometimes I think we’re stuck between underbidding and scaring clients off with worst-case scenarios...

I’ve definitely run into this, especially when I was getting quotes for a commercial roof replacement last year. The initial walk-through seemed straightforward, but after the “full” inspection, suddenly there were all these extra line items - some of which felt more like “potential” issues than actual problems. I get wanting to be thorough, but it’s tough to know where to draw the line between being proactive and just overdoing it.

One thing I noticed: when I asked for clarification on a couple of flagged issues (like minor cracks in the parapet wall), the inspector admitted they might not need immediate attention. But once it’s in the report, it’s hard to ignore - especially if you’re not an expert. I ended up prioritizing what really needed fixing and holding off on the rest, but it made me wonder if I was taking too much risk.

Is there a way to get a second opinion without coming off as difficult? Or is that just part of the process? Sometimes it feels like you’re stuck between trusting the pros and not wanting to pay for every “what if” scenario...