Three garage floor epoxy quotes can still describe three different jobs. The proposal that looks cheapest often skipped a prep step the other two priced in. Comparing installers the right way means reading past the total and into what each one actually plans to do to your slab.
Start with your concrete’s condition and how you’ll use the space
Before any proposal makes sense, every installer needs to look at the same slab and hear the same use case. A two-car garage that parks daily drivers needs a different plan than a garage doubling as a home gym or workshop with rolling tool chests and dropped weights.
Walk the space with each installer and point out what you already know: old oil stains, hairline cracks, a section that always feels damp, or a spot where a previous coating peeled. Ask whether they test for moisture coming up through the slab, either with a calcium chloride test or a relative humidity probe, before writing the proposal. A slab that traps moisture needs a different system or a vapor-mitigating primer, and an installer who skips testing is guessing.
San Diego’s slabs don’t all sit in the same conditions. A garage near the coast in Ocean Beach or Pacific Beach lives inside a marine layer that keeps ambient humidity higher for more of the year, which means more moisture pressure working against a coating from underneath. A slab in El Cajon or Santee deals with drier air but bigger daily temperature swings, which stresses a coating differently as it expands and contracts. An installer who treats every San Diego County garage the same way, without asking where the house sits, hasn’t priced the job correctly.
Get a return-visit walkthrough if a proposal was written from a phone call alone. A coating system that ignores real cracks, an unusually damp corner, or heavy vehicle traffic isn’t cheaper. It’s a redo waiting to happen, and you’re the one who pays for round two.
Think through how the space actually gets used before you talk to a single installer, since that framing shapes every proposal you get back. A garage that only ever sees two sedans coming and going has different needs than one where a work truck comes and goes with a loaded bed, or where a hobbyist rolls heavy equipment across the floor on casters. Tell each installer about planned changes too, a car lift, added storage racks, or a workshop buildout, since some of those additions change what the floor underneath needs to handle.
Compare preparation steps in each written scope
Prep is where garage floor jobs succeed or fail, and it’s also where quotes diverge the most without homeowners noticing. Ask each installer to state their prep method in writing: diamond grinding, shot blasting, or acid etching. These are not interchangeable, and a written scope that just says “surface prep included” tells you nothing.
Ask specifically whether the quote includes degreasing oil stains, patching cracks and pits, and grinding down any high spots or old adhesive residue left from carpet tile or a prior coating. If a garage previously had a different flooring system, removal and disposal of that material should appear as its own line item, not get folded silently into “prep.”
Confirm how cracks get handled. A hairline crack might just get filled and coated over. A wider or moving crack may need a flexible crack filler or a different repair approach entirely, and an installer who proposes the same fix for both hasn’t actually assessed the crack. Put the moisture testing method from the previous section in writing here too, since it belongs in the prep section of the proposal, not as a verbal promise.
Compare the proposals side by side once you have them. If one installer’s prep section is three sentences and another’s runs a full paragraph with specific steps, that’s not a coincidence. It usually reflects how much thought went into the rest of the job.
Ask each installer how they’ll handle the areas near the garage door opening and the transition to the driveway, since that edge sees the most weather exposure and the most wear from tires rolling across it. Some installers treat that transition as part of the standard scope, others price it separately or skip it entirely, and that difference alone can explain a meaningful gap between two otherwise similar quotes.
Ask which coating layers the installer proposes
Once prep is settled, ask each installer to name every layer of the system: primer, base coat, any broadcast material like flakes or quartz, and topcoat. A one-coat rolled-on kit and a multi-layer flake system with a protective topcoat are both called “epoxy,” and they hold up very differently under daily traffic.
This is also where the epoxy-versus-polyaspartic question comes up. The polyaspartic vs epoxy garage floors guide breaks down how the two systems compare on UV exposure and cure speed, which matters if your garage door stays open a lot or gets direct sun. Ask the installer which base coat and topcoat combination they’re proposing and why they picked it for your specific garage, not a generic answer about what they always use.
If you’re still deciding whether epoxy makes sense for your garage at all, the epoxy garage floor coating guide covers the basics, and the garage epoxy floor coating cost guide walks through what drives price by system. Bring specific questions from those guides back to each installer and compare their answers, not just their totals.
Ask about color and finish options too, since a full-broadcast flake floor, a solid color floor, and a metallic or decorative finish all use different amounts of material and different application steps. A quote built around a basic solid-color floor and a quote built around a heavy flake broadcast aren’t the same project, even when both installers call the end result “epoxy,” so make sure every proposal you’re comparing describes the same finished look.
Confirm access and care instructions
Cure schedules vary by product, temperature, and humidity on the day of application, so don’t assume a number you read online applies to your job. Ask each installer for the specific timeline they expect for foot traffic, light vehicle traffic, and full cure before heavy use, in writing, based on the product they’re using and San Diego’s conditions that week.
Ask about ventilation during application. Some coating systems produce strong odors while curing, and the installer should tell you whether the garage door needs to stay open, how long, and whether that’s workable with your household’s schedule. If the garage shares a wall with living space, ask how they’ll manage fumes reaching the house.
Confirm what happens to items currently stored in the garage. Some installers expect the space cleared before they arrive. Others include moving smaller items as part of the job. Get this in writing so it doesn’t become a surprise on install day, along with how they’ll protect walls, baseboards, and the garage door track from overspray or drips.
If the garage doubles as the only entry point into the house, ask how the installer plans to manage household access while the floor cures. A side door, a temporary walking path along a taped-off section, or a plan to stay out of the garage entirely for a stretch are all workable approaches, but they need to be discussed before the crew shows up, not figured out mid-project.
Review exclusions before choosing an installer
The exclusions section of a proposal tells you as much as the scope itself. Ask what’s specifically not included: wall coating, baseboard touch-up, disposal fees for old flooring, or coverage for cracks discovered once grinding starts and reveals something worse underneath.
Ask each installer what happens if the slab reveals a larger problem during prep, like a crack that turns out to be structural or moisture readings that come back high. A written change-order process protects both sides. A verbal “we’ll figure it out” doesn’t.
Before signing with any installer, verify their license through the CSLB license lookup and ask them to confirm it matches the business name on the proposal. Get their warranty terms, if any, in writing directly from the installer rather than relying on a website claim, since warranty coverage varies by company and by product line.
Ask what happens if you’re unhappy with the finished floor. A clear process for addressing a visible flaw, an uneven section, or a color that doesn’t match the sample, protects you far more than a vague promise of satisfaction. The installer who answers this question specifically, with a real process rather than a general assurance, is usually the one who has handled a callback before and knows how to make it right.
When to call us
A garage floor coating job that skips moisture testing, mismatches the prep to your slab, or leaves the coating system vague on paper tends to fail early and cost more to fix than it would have to do right the first time. Call us at (858) 400-6422 and we’ll connect you with a licensed local painter.