Most people looking up epoxy floor prices want one thing: a number they can plan around before anybody comes out to the house. Very few St. Louis installers put one on their website. We do, with one honest condition attached — the figures below are typical ranges for the St. Louis area, not a quote. Your slab decides the final price, and we only commit to a number after we have seen it.
This guide covers what a garage or basement floor usually costs here in 2026, the four things that push a job toward the low or high end, and why the age of your house matters more in St. Louis than in most metro areas. If you would rather skip the reading, Floor Studio gives you a range for your own floor in about a minute.
Typical St. Louis Epoxy Floor Prices for 2026
| Project | Typical range | What that assumes |
|---|---|---|
| Flake floor with a polyaspartic top coat | about $5 – $9 per sq ft | Our most-requested garage system, standard prep |
| 2-car garage (about 400–500 sq ft) | about $2,400 – $4,600 | Same system on a sound slab |
| 3-car garage (about 600–800 sq ft) | about $3,600 – $7,000 | Same system, larger slab |
| Basement floor | about $6 – $9 per sq ft | Before any moisture work the slab may need |
| Commercial or industrial floor | Quoted per project | After a site visit |
Pick a size, finish and color in Floor Studio and see a typical St. Louis range in about a minute.
Open Floor Studio →Typical, not a quote. These ranges come from published St. Louis-area and national price data, checked against the system we install most often. They assume a slab in decent shape that needs ordinary grinding and crack filling. A floor with heavy damage, an old coating to strip, or a moisture problem costs more. A small, clean, never-coated slab often lands near the bottom.
Garage Floors: What Size Does to the Number
Square footage drives the price more than anything else, but the bill does not rise in a straight line. Some costs are about the same whether the slab is 300 or 800 square feet: bringing the grinder and dust vacuums out, setting up, masking the walls and door, and waiting between coats. On a small garage those fixed costs are a larger share of the total, so a one-bay garage costs more per square foot than a three-bay one.
A rough way to estimate before you call:
- Measure the floor wall to wall, including the strip under the garage door, and multiply length by width.
- Don’t subtract shelving or storage you can move out for a day; it gets cleared and the whole floor gets coated.
- Multiply by about $5 for a simple, sound slab and by about $9 for one that needs more repair, then compare the result with the 2-car and 3-car ranges above.
A two-car garage in a 1990s West County subdivision is often somewhere around 400 to 500 square feet. Older garages in the city vary far more. Many sit behind the house on the alley, some are narrow single bays, some have been widened, and plenty have patched or uneven concrete. That is why we measure on site rather than price a floor from a photo.
Basement Floors: Priced Per Square Foot, Checked First
Basements are a big share of the work around here. Census data show that about half of the new single-family homes finished in the Midwest in 2025 still came with a full or partial basement, and older St. Louis houses have them almost everywhere. A typical basement floor runs about $6–$9 per square foot. That covers grinding, crack repair and the coating system. It does not cover fixing a water problem.
That last point matters. A basement slab sits below grade and can carry moisture up from the soil, so we check the slab for moisture before we price it. If the reading is fine, the price stays in the normal range. If it isn’t, there are two honest paths: fix the water source first — a drainage or foundation job, not a flooring one — or, where conditions allow, use a moisture-tolerant primer, which adds cost. You will know which applies before you spend anything.
What we won’t do is tell you a floor coating waterproofs a basement. It doesn’t. What it does is turn a dusty, stained slab into a surface you can mop and disinfect, which counts for something in a region that remembers the record 1993 Mississippi flood and the December 2015 Meramec flood.
Four Things That Move a St. Louis Floor Up or Down the Range
1. The age and condition of the slab
New concrete is easy to prepare. Concrete that has spent 40, 60 or 90 years under cars, oil drips, paint cans and winter slush is not. Old slabs tend to have more cracks to fill, more flaking or spalled spots to rebuild, and more oil soaked into the surface that has to be ground out. Each of those adds labor.
Brand-new slabs have their own catch. Fresh concrete has to cure before it can be coated — most coating makers ask for roughly four weeks — and new floors are often finished with a curing compound that has to be ground off. If you are building or pouring a new garage floor, call before the pour so the timing works.
2. Moisture in the slab
Moisture coming up from below is one of the most common reasons a coating lets go, so we check for it before coating and price accordingly. A dry slab costs nothing extra. A damp one may need a moisture-tolerant primer. A wet one may need the water dealt with before any floor goes down. Basements and older slabs need attention more often, but we check newer ones too.
3. Size and layout
Beyond raw square footage, the shape of the room matters. Steps, a sunken landing, floor drains, support posts, a floor that runs under cabinets, or a garage on two levels all take extra hand work. A wide-open rectangle is the cheapest shape there is to coat.
4. The system you choose
The ranges above are for our standard flake floor with a polyaspartic top coat — what most St. Louis homeowners pick for a garage. A plain solid-color floor can come in lower. A metallic finish, an extra build coat for heavy use, or a urethane cement system for a hot, wet room costs more, and we quote those after seeing the space. Anti-slip additives are available for all of our coatings, and low-VOC options are available for rooms you live in; ask about both when we come out.
Want a Number for Your Own Floor?
Call for a free on-site estimate. We measure, check the slab and put the price in writing before any work is booked.
Why St. Louis Housing Makes Prices Vary So Much
St. Louis doesn’t have one housing stock. It has three, and each one tends to produce a different kind of job.
- The city. The median home in the City of St. Louis was built in 1938, and more than half of all homes there predate 1940 (Census ACS 2024). Many garages are detached, out back on the alley. Expect older, patched concrete and more repair time.
- The inner-ring suburbs. University City, Webster Groves, Clayton, Brentwood and Kirkwood have median build years between 1949 and 1962. Their slabs are mostly 60 years old or more — usually sound, but stained, pitted and often painted at some point.
- West County. Chesterfield, Ellisville and Wildwood have median build years from 1982 to 1992. A 30-to-45-year-old garage slab that has never been coated is often the simplest job we see, and it tends to land in the lower half of the range.
Town medians are from Census ACS 2020–2024 five-year estimates. Your own house may be older or newer than its town’s median; the point is that the slab, not the ZIP code, sets the price.
Does the Season Change the Price?
Usually not by much, but it can change the system and the schedule. NOAA’s 1991–2020 normals for Lambert airport show about 47 days a year at 90°F or hotter and about 85 nights at or below freezing. Coatings react to both. In July heat, many coatings set faster and have to be mixed and spread in smaller batches; on muggy days we compare slab temperature with the dew point so moisture doesn’t condense under the coating. In a cold, unheated garage in January, standard epoxy cures slowly, which is one reason polyaspartic is popular here — it is built to cure fast across a wider range of temperatures. More on that in epoxy vs. polyaspartic.
Commercial and Industrial Floors
We don’t publish a per-foot price for commercial work, because the spread is too wide to be useful. A small retail floor, a restaurant kitchen and a warehouse with forklift traffic need different systems and different prep. A kitchen or brewing floor that sees hot water and washdowns may call for urethane cement. A warehouse may need a thicker build and marked aisles. A showroom may want a decorative flake or metallic finish.
For any business floor we visit the site, look at the slab and at how the space is used, and quote the project. Tell us how long the space can be closed and we will plan the system around that window. Our commercial floors page covers the options in more detail.
How We Quote a St. Louis Floor
- Call or send the form. Tell us the room, the rough size and what bothers you about the floor today.
- Free on-site estimate. Vince, who has installed floors across St. Louis for years, or someone from our team measures the floor, looks at cracks, stains and any old coating, and checks the slab for moisture.
- A written price. One number for the system we recommend, with the prep spelled out, plus any option you asked about.
- Install day. Most residential projects are completed in one day; some take two. Light foot traffic is usually fine after about 24 hours.
Comparing quotes? Line them up on the same points: how the slab will be prepared, whether moisture is checked, how cracks are repaired, what goes on top, and how long you will be off the floor. A low number that leaves out the prep is not the same floor.
Frequently Asked Questions
How much does epoxy flooring cost in St. Louis?
A typical St. Louis garage floor with decorative flake and a polyaspartic top coat runs about $5 to $9 per square foot. That puts most 2-car garages at about $2,400 to $4,600 and most 3-car garages at about $3,600 to $7,000. Basement floors run about $6 to $9 per square foot. These are typical ranges, not a quote; we price each floor after seeing it.
Why do two garages of the same size get different prices?
Because the slabs are different. A 1990s West County garage that has never been coated needs less work than a 1930s city garage with cracks, oil stains and old paint. Moisture, layout and the system you choose also move the price.
Does a basement floor cost more than a garage floor?
Per square foot it is similar, about $6 to $9. The difference is moisture: we check every basement slab first, and if it needs a moisture-tolerant primer or a water problem fixed, that adds cost. A floor coating does not waterproof a basement.
Are estimates free?
Yes. Estimates are free and done on site, so we can measure the floor and check the slab before giving you a price. Call (314) 334-1902 to set one up.
How long does installation take?
Most residential projects are completed in one day; some take two. Light foot traffic is usually fine after about 24 hours, and we tell you when the floor is ready for vehicles.
What do commercial or industrial floors cost?
Commercial and industrial floors are quoted per project after a site visit, because the right system depends on traffic, chemicals, heat, water and how long the space can be closed.