Hiring the wrong concrete contractor costs you twice. You pay for the failed floor, then pay again to fix it. The right contractor transforms your space with a floor that lasts decades. The wrong one leaves you with cracks, peeling, and regret within months.
Most homeowners focus on price. That’s a mistake. The cheapest bid usually means shortcuts on base prep, inferior materials, or an unlicensed crew. This guide shows you exactly what to verify before signing any contract.
Start With License and Insurance Verification
Check their contractor’s license first. Visit your state’s government licensing website and search their license number. Verify the license is active and covers concrete or flooring work specifically. A general contractor license doesn’t always include flooring expertise.
Some contractors claim their license is “being renewed.” That’s a red flag. Licensed contractors renew on time. They don’t let coverage lapse during active projects.
Insurance Protects You From Liability
Request certificates for both general liability and workers’ compensation insurance. The certificate should list your name and property address. Generic certificates aren’t enough.
Call the insurance company to verify the policy is active. Expired insurance puts you at risk. If a worker gets injured on your property without valid workers’ comp, you could face a lawsuit.
Ask if their subcontractors carry separate insurance. Many contractors use subs for specialized work. Those subs need their own coverage.
Business Legitimacy Matters
Get their physical business address and main phone number. Drive by the address to confirm it’s a real office, not a PO box or residential address. Legitimate contractors maintain a verifiable business location.
Ask what experience they have. Inexperienced companies might offer low prices because they’re learning on the job or plan to disappear after a few jobs.
Verify Their Technical Competence
Concrete experience doesn’t always equal flooring expertise. For example, a contractor who pours driveways all day might not understand how to apply flakes properly.
Also, ask how many flooring projects they complete each year. Request examples matching your specific needs. Garage floors differ from industrial and commercial interiors.
Base Preparation Determines Success or Failure
Poor base prep causes most concrete floor failures. Ask detailed questions about their preparation process.
If you have existing coatings or sealers, how will they remove or prepare them? Old coatings that aren’t properly removed cause new coating failures.
TORQ Coatings offers diamond grinding, crack repair, and professional cleaning to ensure maximum adhesion and durability.
Listen for specific details. Vague answers like “we do standard prep” indicate they don’t actually know what they’re doing.
Surface Prep Methods Reveal Expertise
For coated or polished floors, surface preparation determines how well the coating bonds. Ask if they use diamond grinding. This method properly profiles the concrete surface.
Acid etching doesn’t work for modern coating systems. Contractors still using acid etching are behind current best practices.
Ask about crack repair procedures and how they level low spots. They should address all surface defects before coating. Skipping repairs shows up immediately in the finished floor.
Moisture Testing Is Recommended for Concrete Floors
Any coating applied over a concrete slab needs moisture testing first. Concrete slabs contain water that migrates upward. If you trap that moisture under a coating, the coating fails. It bubbles, peels, or lifts completely.
Ask about their moisture and vapor emission testing procedures. They should test moisture levels and vapor emissions using specific equipment. Surface moisture meters aren’t enough for coatings.
They need to explain what moisture levels are acceptable for the coating system they’re installing. Different coatings have different tolerance levels.
Check References and Reputation Thoroughly
Online reviews give you a starting point. Check their Google Business Profile, Yelp ratings, and Better Business Bureau rating. Look for patterns in the feedback.
Consistent comments about quality, cleanliness, and staying on schedule matter as much as five-star reviews. Consistent performance over dozens of jobs proves reliability.
Actually Call Their References
Request at least three recent local references for projects similar to yours. Then call them. Many people skip this step. That’s a mistake.
Ask specific questions. Did they start on time? Did they finish when promised? How did they handle cleanup? Would you hire them again? Any issues after installation?
References who hesitate or give lukewarm responses tell you something. Enthusiastic recommendations from multiple customers indicate quality work.
Review Their Photo Portfolio
Request before and after photos. Ask to see examples matching your project.
Garage floor photos don’t prove they can handle a 10,000-square-foot commercial floor.
The best contractors offer job site visits. Seeing work in person reveals quality that photos might hide.
Verify Supplier Relationships
Ask which products they use, and it may be worth reaching out to their supplier.
Suppliers know which contractors run solid operations. They also know which ones have financial problems or quality issues. A supplier’s honest assessment can save you from a bad hire.
Understand the Complete Installation Process
Have them walk through every step from start to finish.
Listen for specifics about timing and sequencing. “We come out and do the floor” isn’t a process explanation.
A professional contractor knows exactly how each phase connects to the next.
Know Who’s Actually On Your Job
Ask who will be on site daily. Will the owner be there? What’s the crew size?
Find out if they use employees or subcontractors. Both can work well, but you need to know who’s accountable. If they subcontract the actual installation, what’s the sub’s experience and credentials?
Confirm your main point of contact. You need one person who can answer questions and address issues quickly.
Curing Time Requirements
Concrete coatings take time to cure. Ask about minimum cure time before foot traffic, vehicle traffic, and heavy objects can be moved onto it.
For polyurea/polyaspartic systems, you typically need 24 to 48 hours (possibly up to 72 hours in extreme cases) and up to a week for epoxy systems.
Get Everything in Writing
A verbal agreement is worth the paper it’s printed on—in other words, nothing. Get a detailed written contract covering every aspect of the work instead.
Detailed Scope of Work
If it’s not written in the contract, assume it won’t happen. “We’ll take care of that” means nothing without documentation.
Fixed-Price Estimate Breakdown
Request a fixed-price estimate that separates labor costs, materials costs, and optional upgrades. Know what’s included and what’s not.
Schedule and Payment Terms
Lock down the start date, expected duration, and daily work hours. Understand how delays are handled. Get weather delay policies in writing.
Be careful about paying 100% upfront. Sometimes this is okay, but caution is advised. Do these contractors have a robust history that supports this level of trust, or are they likely to disappear after you’d paid them $5,000?
Materials and Methods Matter
Ask what specific products and brands they use. Find out why they recommend those products.
Generic answers indicate they use whatever’s cheapest that week.
Get information about VOC levels. Low-VOC products matter for indoor air quality and occupied spaces.
Recognize the Red Flags
Some warning signs should end the conversation immediately, or at least, give you pause.
Pressure to sign today means they don’t want you thinking it over or getting other bids. “This price is only good until 5pm” is a manipulation tactic. Professional contractors don’t play these games.
Requests for full payment upfront should be a red flag. They may be financially desperate or planning to take your money and run.
Significantly lower pricing than competitors usually means shortcuts. They’re skipping base prep, using inferior materials, or hiring unskilled labor. The lowest bid often becomes the most expensive job after you pay someone else to fix it.
Missing or expired licenses and insurance documentation are deal-breakers. Don’t accept excuses. Licensed and insured contractors provide current documentation.
Contractors with no moisture testing are behind industry standards. This isn’t optional. It’s basic professional practice.
Professionalism Matters From First Contact
Poor communication during the consultation usually gets worse during the job. If they’re late for the estimate appointment or don’t return calls promptly, that’s your future experience with them.
If they brush off questions with “don’t worry about it” or “trust me, we know what we’re doing” this indicates they can’t explain their process. Professionals welcome detailed questions because it shows they’re serious about quality.
Test their responsiveness during quoting. Send a follow-up question and see how fast they reply. Contractors who disappear after getting your deposit won’t suddenly become communicative.
Warranty and Post-Installation Support
Get warranty terms in writing. Clarify materials warranties from workmanship warranties.
Understand warranty exclusions and conditions. Some warranties exclude damage from chemical spills, salt, or specific uses. Know what’s covered before you need it.
Ask if the warranty transfers with property sale. Transferable warranties add value if you sell your home.
Request written maintenance instructions. Proper maintenance extends floor life. Warranty coverage sometimes requires following maintenance guidelines. Better contractors offer longer terms.
Problem Resolution Process
Confirm their policy if you’re not satisfied with the work. How are defects addressed? What’s their callback response time?
Ask about their dispute resolution process. Problems happen. You need to know how they’ll be fixed before issues arise.
Compare Total Value, Not Just Price
Getting three written estimates is standard advice. Comparing those estimates correctly is what most people miss.
Look beyond the bottom-line price. Compare scope, materials quality, warranty coverage, and timeline. A $5,000 floor that lasts 20 years costs less than a $3,000 floor that fails in three years.
Factor in maintenance costs. Some floor systems require resealing or refinishing. Others are virtually maintenance-free for decades. Calculate the total cost of ownership.
Consider the contractor’s experience and reputation. Established contractors with hundreds of successful projects cost more for good reason. Their expertise prevents expensive mistakes.
Frequently Asked Questions
How do I verify a contractor’s license is active and valid?
Visit your state’s contractor licensing board website and search their license number. The database shows current status, license type, and expiration date. Call the licensing board if you have questions about what the license covers. Verify the license category includes concrete floor coating work specifically.
What insurance should a concrete contractor carry?
Contractors need general liability insurance covering property damage and bodily injury. They also need workers’ compensation insurance covering their employees. Request certificates for both. Call the insurance companies to verify policies are active and confirm coverage amounts meet your state’s minimum requirements.
How many contractor estimates should I get before deciding?
Get written quotes from at least three licensed contractors. This gives you pricing context and lets you compare approaches to your project. Avoid the temptation to just pick the middle bid. Compare scope of work, materials quality, timeline, and warranty coverage. The most expensive bid might include superior materials and methods that justify the cost.
What’s a reasonable deposit amount for a concrete flooring project?
Standard deposits range from 25% to 30% of the total project cost. Be extra careful about paying 100% upfront or agreeing to large cash payments.
Why is moisture testing important for concrete coatings?
Concrete contains water that migrates upward through the slab. If you install a coating before the concrete is dry enough, trapped moisture causes the coating to bubble, peel, or delaminate completely. Professional moisture testing measures both surface moisture and vapor emissions to confirm the slab is ready for coating. Different coating systems have different moisture tolerance levels, so testing prevents expensive coating failures.
How long should I wait before driving on a new concrete floor coating?
Some polyurea and polyaspartic coatings allow vehicle traffic in 24-48 hours. Traditional epoxy coatings might need 3-7 days. Always follow the specific contractor’s timeline based on the products they used and ambient temperature conditions.
What should I ask when checking contractor references?
Call at least three recent references and ask specific questions. Did the project start on time? Did they finish when promised? How was communication throughout the project? Did they clean up properly? Any issues after completion, and how were they handled? Would you hire them again? Ask about the specific type of project to confirm it matches your needs.
How do I know if a bid is too low to be legitimate?
If one bid is 30-40% lower than others, that’s a warning sign. Drastically low bids usually mean shortcuts on base preparation, inferior materials, unlicensed labor, or missing steps from the scope. Calculate the cost of materials alone, then consider labor, equipment, insurance, and business overhead. If the bid doesn’t seem to cover these basics, the contractor either doesn’t understand the job requirements or plans to cut corners.
Can I install a coating on brand new concrete immediately?
No. New concrete needs time to cure and dry before coating installation. Most coatings require a minimum 28-day cure period. Some systems need longer. The concrete must reach acceptable moisture levels before coating, or the coating will fail. Testing confirms when the slab is ready. Rushing this step to meet a deadline guarantees coating failure and complete project redo.
Key Takeaways
Verify credentials first. Check contractor license status on the government licensing website and confirm insurance certificates are current and list your property address.
Ask detailed technical questions. Contractors should explain surface prep methods, moisture testing, and coating processes without hesitation.
Check references thoroughly. Call three recent customers with similar projects and ask specific questions about timeline, quality, communication, and problem resolution.
Get everything in writing. The contract should detail scope of work, materials, timeline, payment schedule tied to milestones, and warranty coverage for both materials and workmanship.
Watch for red flags. Pressure to sign immediately, requests for full payment upfront, missing credentials, vague technical answers, or significantly lower pricing than competitors are all red flags.
Compare total value, not just upfront cost. Factor in warranty coverage, expected lifespan, maintenance requirements, and contractor experience when evaluating bids.
Test their responsiveness. How contractors communicate during the sales process predicts how they’ll communicate during your project and after completion.