Introduction
Garage work splits cleanly: walls are easy DIY, floors are where the DIY/pro decision really matters. Epoxy looks straightforward on video and punishes small errors expensively. This guide helps you decide per-surface. Get quantities from the Garage Paint Calculator.
Walls: Almost Always DIY
Garage walls are the easiest painting in the house — big flat areas, no cutting-in around trim, low cosmetic stakes. DIY cost $100–$175; pro cost $500–$1,200. Unless you physically can’t do it, walls are DIY.
Floors: The Real Decision
DIY epoxy makes sense when:
- Concrete is in good condition (no major cracks, no moisture issues).
- You can clear the garage completely for 4–7 days.
- You’re using a forgiving water-based 2-part kit (not 100% solids or polyaspartic).
- You have a helper for mixing/rolling.
- Temperature and humidity will cooperate.
Hire a pro when:
- Concrete needs diamond grinding, extensive crack repair, or moisture mitigation.
- You want polyaspartic or 100% solids epoxy (fast cure = no learning curve allowed).
- The garage can’t be empty for a week.
- You want a warranty — pros typically warrant adhesion 1–5 years.
Cost Comparison (400 ft² / 37 m² double garage)
| Approach | Walls | Floor (epoxy) | Total |
|---|---|---|---|
| Full DIY | $100–$175 | $200–$400 | $300–$575 |
| DIY walls + pro floor | $100–$175 | $1,200–$2,800 | $1,300–$2,975 |
| Full pro | $500–$1,200 | $1,200–$2,800 | $1,700–$4,000 |
The popular hybrid — DIY walls, pro floor — captures most of the savings while putting the technical work in expert hands.
Warranty Comparisons in Detail
A warranty is the single biggest thing your money buys beyond labor. But not all warranties are equal — read the terms, not the headline years.
| Warranty aspect | Typical pro warranty | What to verify |
|---|---|---|
| Adhesion / delamination | 1–5 years | Does it cover full re-do or just spot repair? Is moisture-related failure excluded (it usually is)? |
| Workmanship | 1–2 years | Covers application defects (bubbles, missed spots, uneven flake). Ask what’s explicitly excluded. |
| Manufacturer material warranty | 5–15 years (pro-grade systems) | Usually covers material defects only — not application errors. Requires the installer to be certified/applied per spec. |
| DIY kit warranty | Effectively none on adhesion | Kit makers warrant the product isn’t defective; they don’t warrant your prep or application. Read the fine print. |
Key warranty questions to ask:
- Is the warranty in writing, on company letterhead, with specific terms — or a verbal “yeah, we stand behind our work”?
- What voids it? (Common: moisture issues discovered later, structural cracking, chemical spills, hot-tire damage from early vehicle return.)
- Who honors it if the company closes? Manufacturer-backed warranties through certified installers survive contractor failure; a one-man-shop verbal promise doesn’t.
- What’s the remedy — full strip-and-recoat, or a touch-up? Get this in writing.
- Is there a maintenance requirement (e.g., “clean with pH-neutral cleaner only”) that could void coverage?
A 5-year adhesion warranty from an established local company with manufacturer certification is genuinely valuable — it’s the pro’s confidence made contractual. A “lifetime warranty” from a company founded last year is marketing. Weight the warranty by the company’s age, reviews, and whether the manufacturer co-backs it.
What “Prep Included” Really Means
“Full prep included” is the most abused phrase in floor-coating quotes. Two contractors can both claim it while doing very different work. Here’s the prep ladder, from minimal to proper:
- Sweep and degrease only — inadequate for any film coating. If this is the whole prep, walk away.
- Degrease + acid etch — the minimum acceptable DIY-level prep. Fine on virgin porous concrete; inadequate on hard-troweled or previously coated slabs.
- Degrease + diamond grind — the professional standard. Removes laitance, old coatings, and contamination; creates the specified surface profile.
- Degrease + diamond grind + crack repair + joint filling — full pro prep. Cracks routed and filled with flexible filler, spalls patched, joints addressed.
- All of the above + moisture testing and mitigation — the complete job. Calcium chloride or RH probe testing with documented readings, vapor-barrier primer if needed.
How to pin it down in the quote: ask for the prep scope in writing, line by line. “Diamond grind entire floor with HEPA vacuum dust control” is a commitment; “prepare surface” is a shrug. Also ask: who moves the heavy items? (Some pros include full clear-out; others expect the garage empty.) Is crack repair priced per linear foot/meter or included? What happens if moisture is found mid-job — stop work, change order, or proceed with mitigation at what cost?
A useful rule: prep should be 30–50% of a pro floor quote. If a $2,000 quote allocates only $200 to prep, the prep is being shortchanged — and prep is what determines whether the floor lasts 10 years or 10 months.
Vetting a Floor Coating Pro
- What surface prep is included? (Want: diamond grinding or shot blasting, not just etching.)
- What exact product system? (Get brand and product names.)
- How do you handle moisture issues if found?
- What’s the warranty on adhesion?
- How long will vehicles need to stay out?
Questions to Ask References
Online reviews are a start; direct references are better. Ask the contractor for 3 recent clients (within the last 1–2 years) and actually call them. Ask:
- “How long ago was your floor done, and how does it look today?” — the single most informative question. A 2-year-old floor tells you more than a 2-week-old one.
- “Did they hit the schedule they promised?” — especially the return-to-service date. Delays mean your cars live in the driveway.
- “Was the final price the quoted price?” — change orders for “unexpected prep” are the classic margin-builder. Good contractors disclose the change-order triggers up front.
- “How did they handle dust and masking?” — grinding dust gets everywhere. Pros seal the house door, use dust-controlled grinders, and mask meticulously.
- “Any issues since, and how did they respond?” — this tests the warranty in practice, not on paper.
- “Would you hire them again?” — the closer. Hesitation is an answer.
Also check: state contractor license (requirements vary — some states license painters/coatings contractors, some don’t), general liability insurance (ask for the certificate — $1M coverage is standard), and workers’ comp if they bring a crew. An uninsured contractor’s ladder through your drywall becomes your problem.
Payment Structures
How you pay is part of the protection. Standard structures for residential floor coating ($1,500–$5,000 jobs):
| Structure | Typical split | Assessment |
|---|---|---|
| Deposit + balance on completion | 25–50% down, rest on completion | Standard and fair. Never pay more than 50% up front. |
| Three-stage | 1/3 deposit, 1/3 at prep completion, 1/3 on final walkthrough | Best for larger jobs — ties payments to visible milestones. |
| Full payment up front | 100% before work | Red flag. No legitimate contractor needs full payment before starting. |
| Cash discount | 5–10% off for cash | Common and legitimate, but get the same written contract and receipt — “cash, no paperwork” voids your warranty and recourse. |
Protect yourself: hold the final 10–15% until a walkthrough after the cure period (not the day they finish — some defects like blush or soft spots only show after 48–72 hours). Pay by check or card, not cash without receipt — you want a paper trail if the warranty is ever invoked. And get the warranty terms, product names, and prep scope in the written contract before paying the deposit, not after.
Red Flags When Hiring
- Quote is dramatically lower than others (30%+ below the pack) — the prep is being skipped or the product is bottom-tier. Get the product names and prep scope in writing and compare apples to apples.
- “One-day garage floors” with epoxy — proper epoxy needs cure time; one-day systems are polyaspartic (fine) or rushed epoxy (not fine). Ask which chemistry they’re actually installing.
- No moisture testing offered or mentioned — a contractor who doesn’t test doesn’t want to know, because knowing complicates the sale.
- Won’t name the product brand — “commercial-grade epoxy” without a brand is meaningless. You need the manufacturer and product line to verify specs and warranty.
- High-pressure close (“this price is only good today”) — legitimate contractors give written quotes valid 30 days.
- No physical address or only a PO box — warranty from a ghost is worthless.
Related Guides
- Complete Guide — full walkthrough.
- Cost Guide — detailed pricing.
- Pro Tips — techniques.
Get Your Number
Walls yourself, floors decided by concrete condition and product choice. Quantities from the Garage Paint Calculator, quotes from two floor specialists if hiring.
Disclaimer: Typical US cost ranges; get written local quotes.
