Grinder: rent or buy?
Find the break-even point for the grinder and extractor at your number of jobs.
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Answer three quick questions and see what it takes to start an epoxy flooring business: grinder, dust extractor, tools, insurance, training and first materials.

What the estimate includes
| Line | Default | Typical range |
|---|---|---|
| Grinder rental | $120 a day | 22-inch dual-disc grinders rent for about $90–142 a day |
| Dual-disc grinder | $8,488 | A new 22-inch dual-disc grinder (230V) |
| Dual-disc tooling | $400 | About $195–530 a set |
| Planetary grinder | $16,700 | About $15,700–17,800 new (20-inch) |
| Planetary diamonds | $280 | Varies by bond and grit; ask your dealer |
| Dust extractor | $3,400 | About $3,400–3,900 for a mid-size HEPA extractor (about 240 cfm), enough for a 7-inch edge grinder; small units (about 125 cfm, $1,900–2,400) are not |
| Edge grinder kit | $660 | About $640–716 for a 7-inch grinder, shroud and cup wheels |
| Application tools | $300 | About $150–320 a kit |
| Safety gear | $200 | For two people; respirators run about $23–52 each |
| Moisture testing | $40 | Three calcium chloride tests at $12–36 each |
| Trailer | $4,000 | About $3,450–5,000 for a 6×12 enclosed trailer |
| Hands-on class | $700 | US classes run $99–1,899; compare them |
| LLC filing fee | $150 | $35–500 depending on the state |
| Insurance | $919 a year | Typical yearly costs for flooring installers: general liability $919, tools and equipment $495, commercial auto $2,490, workers' comp $1,726 |
| Cost per lead | $55 | About $45–62 for a flooring lead from Google Local Services Ads |
| Materials | $2.50 a sq ft | About $1–5 a sq ft, depending on the system |
Typical prices for a new coating business. They change over time; confirm before you buy.
Questions
It depends mostly on whether you rent or buy the grinder. If you rent, most of the startup cost is training, small tools, a dust extractor, insurance and setup. Buying a new dual-disc or planetary grinder plus a mid-size dust extractor adds roughly $12,000–22,000.
Renting a 22-inch dual-disc grinder runs about $90–142 a day, and a new one is $8,488. At those rates buying pays off after roughly 60–95 rental days, before you count tooling, maintenance and resale value.
General liability before the first job; for flooring installers it typically runs about $77 a month. Add workers' compensation when you hire, commercial auto if you use a vehicle for the business, and tools and equipment cover once you own the grinder.
Your vehicle, fuel, phone and software, your own pay while you get started, and state-specific costs such as contractor license fees, which you can add in the setup section.
Find the break-even point for the grinder and extractor at your number of jobs.
Every tool you need, what it costs, and what to skip at first.
Put these numbers into a one-year plan, with a template.
The Epoxy Playbook: full installations recorded start to finish, which you can replay as often as you need, plus pricing, quoting and selling the job.