A commercial floor coating quote that only says “epoxy floor coating” and a size can’t be compared to anything. On a 6,000 square foot plant floor, six line items explain almost every gap between bids. They’re the prep, the total coat thickness in mils, the joints, the moisture plan, the edges and drains, and the downtime in work days. Send those six questions to all three bidders, and the spread usually explains itself.
Why do three commercial epoxy bids on the same floor land thousands apart?
Commercial epoxy floor bids vary so much in price because the bidders aren’t pricing the same floor. Our own epoxy cost guide puts warehouse and industrial coating at $6.08 to $10.17 a square foot. The band is wide because it covers two different systems. On 6,000 square feet, it works out to $36,000 to $60,250 with us, before the drive cost (our trip to your site). So the bottom and the top of the band sit many thousands of dollars apart before anyone has cut a price.
| The bid | What the work usually is |
|---|---|
| Low | Thin one-color coat, etched or lightly ground slab, joints left alone |
| Middle | Mid build with a broadcast, ground slab, joints filled, no moisture line |
| High | Heavier build, checked profile, joints and drains done right, moisture plan priced |
None of those three bids is dishonest. The low one is a real floor that a real crew will put down. The question is whether it’s the floor your business needs, and the cover page can’t tell you.
Two words that hide a system
Epoxy floor coating names a family of resinous floor coatings, not a spec. A 12 mil one-color coat fits the phrase. So does a 25 mil broadcast system, and so does a two-coat roll-on over an acid-etched slab. Until a bid gives the thickness in mils and how rough the slab gets ground, you can’t line its price up against anything.
What are the six line items that make a bid comparable?
Each one comes with the question that pulls it out of a vague bid. Put all six in one email to every bidder and ask for a written reply. Our epoxy floor projects show what the finished floors look like.
1. Prep method and a checked profile. Ask: what profile will you grind to, and how do you check it? A real answer names diamond grinding or shot blasting to an ICRI CSP 3 profile. CSP means concrete surface profile, and a 3 is a rough, open texture the coating can lock into. The check should be a set of reference chips. Acid etching only gets to CSP 1 to 2, and surface preparation that light is where most early coating failures start. A profile number alone doesn’t prove the resin will soak in, so a good bid checks that too. Drop water on the ground slab. It should darken the concrete and soak in within about a minute. If it beads on top, the grinding isn’t done. Prep is also where bids swing the most, since it adds to the price per square foot before the first coat goes down.
2. Total coat thickness in mils. Ask: what’s the total dry thickness, not the number of coats? Three thin coats can add up to less material than one heavy one. A coat count tells you nothing you can check. Mils do, and they track straight to how long the floor stands up to wheels.
3. Joints, in or out. Ask: are the control joints and construction joints filled, and with what? On a floor with pallet jacks or forklifts, the joint edges break down first. Say one bid fills joints full depth with a semi-rigid filler and another leaves them open. Then the two bids are for two different floors.
4. The moisture plan and what sets it off. Ask: what calls for a moisture test, which test do you run, and what does the fix cost a square foot if it reads high? Watch for a slab with no vapor barrier under it, a slab of unknown age, or an old coating that peeled off in sheets. On a slab like that, two tests settle it before anyone picks the coating: an ASTM F1869 calcium chloride test and an ASTM F2170 humidity probe. Our moisture barrier primer runs $1.80 a square foot. A bid with no moisture line just leaves that cost for your change-order budget.
5. Edges, cove, and drains. Ask: how does the coating end at the walls, doorways, and drains? A keyed-in edge at a drain and a clean detail at a doorway are where a coating holds or starts to lift. You can’t see this line in a per-foot price, and it shows up in month fourteen.
6. Downtime in work days. Ask for the cure time in hours to foot traffic, to carts, to forklifts, and to wash-down. A cheerful “you’ll be back in business tomorrow” doesn’t count. Then turn those hours into days on your own calendar.
Prep and coat thickness decide how long a commercial floor lasts, and they’re the two lines most often left vague. A coating holds on by gripping the texture of the slab, so it needs a rough profile to lock into. Diamond grinding or shot blasting to an ICRI CSP 3 profile makes that texture. An acid etch only gets to CSP 1 to 2, and it leaves a residue that fights the bond on its own. Thickness then decides how much material sits between the wheels and the concrete. A 12 mil system and a 25 mil system look the same on day one. They split apart under a pallet jack that crosses the same lane four hundred times a week. So get the profile and the mils in writing from every bidder. On a plant floor, the gap between bids usually comes from the spec.
How do you price your own downtime before you price the floor?
With math only you can do. Only you know what a closed or half-speed day costs you.
Call that number your day cost. Then count the extra work days the cheaper system needs, and multiply. Say the low bid saves you some money but costs three more days at half speed. Now you’re weighing that savings against three times your day cost. On most plant floors, that math flips before the second day.
Downtime is what a buyer like you decides on, and almost no bid quotes it in your own terms. A bid gives a price per square foot and how long the install runs. Then it leaves you to turn crew days into work days, and those aren’t the same thing. A crew can finish on a Friday while the floor stays closed to a loaded forklift until Tuesday. That’s two days of work nobody priced. So ask every bidder for the cure time to your kind of traffic, in hours. Turn those hours into days on your own schedule. Then multiply the difference by what a closed or slowed-down day costs you. Run that once, and the cheapest bid often stops being the cheapest. What you pay is the bid plus the work days it takes, and only you know that second half.
Cure hours move with heat and damp air. So a schedule quoted for a 70 degree shop isn’t the one a January install in Oklahoma gets. Our commercial floor coating downtime page has the hour tables for each system. It also has the plain list of jobs that won’t fit in a night or a weekend at all.
Ask for cure-to-your-traffic, in hours
This one question tells you the most: “How many hours until the system you’re quoting takes foot traffic, carts, a loaded forklift, and wash-down?” A crew that has put that system down knows those numbers cold. They can read them right off the data sheet. A bidder who gives you a vague answer is quoting a schedule they haven’t checked.
What does a warranty for the workmanship actually tell you?
Less than most buyers think. The gap is the part worth reading.
We carry a workmanship warranty on the install. It says nothing about materials, because the maker of the product writes its own coverage for it. That’s two papers, two signatures, and two ways a floor can fail. A bid that folds both into one long promise has blurred a line, so ask three questions about it:
- Who honors it? Coverage held by a local crew instead of the maker only lasts as long as that crew’s next five years.
- What voids it? Wash-down chemicals, hot tires, and forklift point loads are common exclusions, and your floor sees every one of them every day.
- What backs up the bond claim? A pull-off number measured per ASTM D4541 is proof. A sentence about bond strength isn’t.
Some bids push how many years the coverage runs and stay vague on the ICRI CSP 3 profile and the mils. That shows you where they want you to look. The residential version of this comparison covers the same pattern on a garage floor.
Can you get an estimate for decorative coatings on a commercial building?
Yes. Our quote tool prices our two decorative epoxy floor systems by the square foot and your address. RESA stands for resin-encapsulated seamless aggregate, which means the color is locked inside the resin. RESA Quartz is colored quartz sand cast into resin twice, then sealed with an epoxy body coat and a clear topcoat. It has no seams and soaks nothing up, so it takes chemicals, carts, and daily mopping. It starts at $8.17 a square foot. RESA Metallic is a glossy resin with swirls of metallic color under a clear urethane topcoat, and it’s made for indoor rooms. It starts at $5.96 a square foot. The range above includes setup. A single rate can sit a little under it.
Then hold every bid, ours too, to the six line items.
Budget, quality, and timeline: pick two
Every commercial floor lands somewhere on that triangle. The smart way to buy one is to decide which corner gives.
Timeline usually decides first, whether anyone says so or not. Say a 6,000 square foot floor has to take a loaded forklift Monday morning. That rules out any system that needs more than about 72 hours before forklifts. One limit like that picks the chemistry before the budget gets a vote. Put budget on top instead, and the floor gets a thinner build or a longer schedule. That’s a fair choice when you make it on purpose, and a bad surprise when it happens by accident. Put quality on top, and the spec sets the other two.
What doesn’t work is wanting all three, then taking the bid that quietly gave one up without saying which. We scope our commercial concrete and coating work against the same triangle. For a slab bid instead of a coating bid, questions to ask a concrete contractor runs the same check. The line items change, but the logic doesn’t.
Send the same six questions, then re-bid
It costs one email and no money. And it works no matter who you hire, even if it’s not us. Put the six line items in writing and give all three bidders the same deadline. Then compare the replies, not the cover pages. If a bidder won’t answer in writing, you’ve learned something worth more than the quote.
Talk through a scope, not a square-foot number
A plant floor with joints, drains, and a fixed shutdown window takes a real talk about the work. Call and walk the six line items against your own floor.
Three numbers on a desk aren’t a decision until they describe the same floor. Make them match, and the choice usually makes itself. If you want a second read on a scope before you sign, the number is (888) 852-3528.
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