Polished concrete equipment cost: your first grinder and vac

Polished concrete equipment cost starts with two machines, not one. A single-phase planetary grinder like the Husqvarna PG 450 lists at $7,765 at one dealer, and the HEPA dust extractor sized to it, the Husqvarna S 26, lists at $3,298. Buying the grinder without the extractor leaves you with a machine that fills the room with respirable concrete dust and a job you cannot hand over clean.

Every dollar figure and every spec below comes off a manufacturer sheet or a dealer’s published listing, linked where it first appears. None of it depends on knowing us, and the rent-versus-buy arithmetic at the bottom works the same whether you ever pick up the phone.

What does the first real kit actually cost?

That is $11,063 before a single diamond touches concrete, and dealer listings move, so treat both numbers as a starting point for your own written quote rather than a price you are owed.

What the table leaves out is everything that wears or gets carried. Metal-bond and resin tooling. A 5-inch angle grinder, a diamond cup wheel, and a dust shroud for the perimeter the walk-behind cannot reach. A pump sprayer and a squeegee for densifier. Cord of the right gauge, and a ramp and straps for moving 240 lbs off a truck. None of that carries a catalog number worth publishing, because segment count and bond are machine-specific and every supplier prices differently. Get written prices, and read the tooling section below before you commit to any of it.

Why is the dust extractor the thing to buy first?

You can rent a grinder in most towns. You generally cannot rent a matched HEPA extractor, and turning up with a shop vac is how a job ends early with an angry customer and a gray film on everything he owns.

The S 26 moves 258 CFM through two H13 filters the manufacturer rates at 99.99% capture for particles at and below 0.3 microns. A shop vac passes the fine fraction straight through and blows it back into the room, which is worse than no vacuum, because it puts the dust where you are breathing instead of on the floor. Husqvarna pairs the S 26 to the PG 280 and PG 450 specifically, and that pairing is about airflow matching the shroud. An extractor that cannot keep up leaks dust at the machine no matter how good the filter is.

Dry-grinding concrete is a respirable crystalline silica exposure, full stop. The homeowner-facing version of that obligation, including why a shop vac fails the test, sits on the concrete floor grinder rental page.

Will your shop power actually run it?

Power is the item that ends more equipment purchases than price does, and almost nobody checks it first.

The PG 450 draws 15A at 110-120V, or 13A on 220-240V. The S 26 draws 20A at 110-120V. Run the pair on house voltage and you are pulling 35A, which is past what a single 20-amp circuit carries. You are either finding two separate circuits on different legs of the panel or moving the grinder to 240V.

Step one size up and the shape of the problem changes. A Lavina 25 S7 runs 25.8 inches of working width off a 10 HP motor at 200-240V and 30A, available in single or three phase. Three phase is where contractors get caught: it exists in industrial buildings and almost nowhere in residential or light commercial, so a three-phase machine quietly converts a whole category of work into calls you have to turn down.

How many jobs before buying beats renting?

Rental houses mostly do not publish grinder rates online. The national counters route you to a quote request, so the first number is one you have to go get: the day rate on the machine you actually rent, plus the damage waiver, times the days a job takes you.

Call that R, the all-in rental cost of one job. Call N your jobs per year. Purchase price P is $7,765 on the PG 450 at the listing above. Years to cover the machine is P divided by R times N.

The rule that falls out: once annual rental spend passes roughly a third of the purchase price, ownership covers itself inside three years. Convert that to the counter’s language and it gets simple. Four jobs a year at 2 rental days each is 8 rental days, so divide your target annual spend by 8 and you have the day rate at which buying wins. At $3,000, that is $375 a day.

Three things the table honestly does not carry. Maintenance and wear parts. Transport and storage for 240 lbs of machine. Resale value, which on a well-kept planetary grinder is real money and pushes the crossover earlier than the arithmetic shows. There is also the item nobody puts on a spreadsheet: the jobs you turned down because the rental was already out on the day the customer wanted you.

What you do not need to buy yet

• Tooling depth. Two metal grits and two resin grits will carry your first several jobs. A full progression in three bonds is money sitting on a shelf, and you will not know which bonds your local slabs want until you have burned through some segments finding out.
• A second machine. Buy the extractor before the second grinder, every time. One grinder and a vac finishes floors. Two grinders and a shop vac finishes nothing.
• A trailer setup. A ramp, ratchet straps, and the truck already in your yard will move 240 lbs.
• Material float, if you run under the Bel Covo operator model. Materials get procured and shipped to the site, so you are not fronting product cost on a job whose price you did not set. That is a description of how the model works rather than an argument for joining it; the full cycle is on the work order walkthrough.

Tooling is the cost nobody warns you about

Metal-bond segments are consumed per pass, not per square foot. Two passes across 1,000 square feet costs the same diamond as one pass across 2,000, which is why a floor that grinds evenly on the first pass is a different job economically from one that does not.

Bond selection runs backwards from intuition. Soft bond belongs on hard concrete and hard bond belongs on soft or abrasive concrete. Get it wrong in the hard direction and the segments glaze, stop cutting, and burn shop hours while consuming almost nothing. Get it wrong the other way and a set disappears in an afternoon. Neither failure announces itself; both just look like a slow day.

Flatness is what quietly decides your pass count. A slab at FF 25 to 30 makes the heads ride the high spots and skip the low ones, so you spend passes flattening before you ever spend passes polishing, and every one of those passes is diamond you paid for. That is not true on an FF 50 slab, and the gap between those two numbers is covered in FF flatness scores and polished floor requirements.

The only tooling number that matters is your own cost per square foot ground. Log segments consumed against square footage on one honest job and you have it. Until you do, every polished floor you bid is a guess wearing a number.

Which machine size fits the work you actually get?

Width is production rate. Weight is grinding pressure, and it is also the answer to whether one man can move the machine alone. A 158-lb PG 280 goes up a step. A 240-lb PG 450 does not, and a 25-inch commercial head needs a ramp and a plan every single time.

If every machine you have run so far came off a rental counter, understand what separates a single-disc walk-behind from a planetary head before you spend $7,765 on the assumption they do the same thing. That comparison lives on the rental counter guide, and the finishing side of the work is in the polished concrete guide.

Buy the machine, not the relationship

Rent until your annual rental spend crosses about a third of the purchase price. Buy the extractor before the second machine. Check your panel before you check prices. Run your first polished job on a slab you poured yourself, because you already know what is in it and you will learn what your own work grinds like before you learn it on somebody else’s floor.

None of that changes based on who you work for. The one thing worth adding is that a capability jump is easier when somebody else has already priced and sold the job, which is the part of this we do.