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Metallic Epoxy Floors in San Francisco, CA
A metallic epoxy floor is a resin coat carrying metallic pigment that drifts into a pattern as it cures, and in San Francisco the slab under it decides most of the job. Laticrete's data sheet DS-85.7-0819 describes its pigments as "aluminum platelets coated with metal oxides," and Sherwin-Williams pours its metallic coat over a pigmented base that is there to "serve as a canvas," warning that "substrate imperfections must be corrected or they can reflect through the system." Where the room is a ground-story garage being converted, City planning rules come in too; SF Planning's ADU page says "Many ADUs are converted from existing storage or garage space."
$5 to $12 a sq ft for metallic floors, national, This Old House additive table (Mar 2026) · full pricing guide
No survey publishes a San Francisco price for metallic floors, and the national data is thin. This Old House's national epoxy cost page (updated March 2026) carries a "Metallic epoxy floor" row at $5-$12 a square foot in its add-on table; Bob Vila's April 2024 page shows that spread in a table headed "Add-ons (Materials Only)." This Old House's garage remodel guide (March 2026) quotes "Custom epoxy floors with fancy patterns" at $15-$25 a square foot. HomeGuide's February 2026 survey puts epoxy in general at $4 to $10 per square foot installed, a national average, and says a metallic tint costs extra; at that rate, 500 square feet, the most a junior ADU may convert, works out to $2,000 to $5,000 before the tint. Angi (August 2026) puts resin type, floor size and prep first among cost drivers, and the published cost ranges sit side by side.
Two published systems show how thick these floors run, in mils, each a thousandth of an inch. Sherwin-Williams' Resuflor Topcoat Metallic II package starts with a pigmented base coat, "200 square feet at 8 mils wet/dry film," adds Resuflor UVE as the metallic coat, 100 square feet a gallon at 16 mils wet with pigment dosed "at the rate of 12 ounces per 3" gallons, and closes with a UV light-stable satin urethane. Westcoat's Liquid Dazzle totals "38-42 mils DFT," dry film thickness, its EC-38 metallic coat going on at roughly 50 square feet a gallon with "a 1/8 inch notched trowel." Westcoat calls it 100% solids, a resin that cures by reaction with nothing to evaporate. ICRI 310.2R files high-build coatings under 10 to 40 mils.
The slab comes first. SF Planning's Sunset context statement says that, with few exceptions, the district's tract houses of the 1920s to 1950s had garages "integrated into the house," and Stonhard warns that slabs "over 25 years old" may lack a moisture barrier. Sherwin-Williams' prep guide, Form G-1 (revised 02/26), draws two limits: by the calcium chloride test, ASTM F1869, "not more than 3 pounds of moisture per 1,000 square feet per 24 hours," and by in-situ probes, ASTM F2170, readings of "80% or lower." It sets its metallic system at CSP 3, a surface profile, or roughness, that ICRI's guideline pictures as a light shot blast, and Westcoat warns that Liquid Dazzle "may not hide epoxy patches, rough concrete or shot blast tracks." The Sunset District page covers that area's houses, garages and ground.
The schedule follows the data sheets, which are written for warmer air than San Francisco's. Sherwin-Williams wants its metallic coat left 24 hours "at 75 degrees F, 50% relative humidity" before light traffic, and gives 14 days for full properties. Westcoat's EC-38 product sheet, at 72 degrees F, lists a 45-minute pot life, the working time of a mixed batch, with foot traffic at "7.75 hr." and wheel traffic at "72 hr." NOAA's 1991-2020 Downtown normals put the normal daily high between 57.8 degrees F in January and 70.2 degrees F in September, outdoor air rather than a room or slab; the San Francisco floor data page lists each month. You empty the room before the crew comes, agree how it will be kept warm, and hold heavy furniture back for the 14 days.
A written quote rests on what the installer finds at the slab: the moisture result by the method the chosen sheet names, the cracks and patches, and the measured area. Look up the license number on CSLB's site before you sign. Business and Professions Code section 7048 exempts only work under $1,000 in labor and materials that needs no permit and no hired help. Section 7159 has the contract describe "the significant materials to be used," which is where the base coat, metallic coat, topcoat and film thickness belong, and under section 7159.5 a down payment may run to 10 percent of the contract amount but no higher than $1,000. The hiring guide covers the right to cancel. Installers reached through this site are independent and hold a California contractor license; quotes and contracts are theirs.
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When a metallic coat fits the room, the slab and the schedule
Westcoat names hotels, casinos, showrooms, salons, restaurants and residential floors as Liquid Dazzle's uses, and Laticrete lists residential garages, car dealerships and retail for its pigments. Each sign below can be checked before a quote; missing one changes the prep, the price or the system.
- The floor is indoors and will stay indoors, since Westcoat marks its Liquid Dazzle system "For interior use only."
- A moisture test by ASTM F1869 or ASTM F2170 came back inside the limit printed on the chosen system's data sheet.
- The slab is sound and close to flat, or you accept grinding and patching, because a smooth metallic film shows what it covers.
- Little sun reaches the floor, or the system ends in a UV light-stable urethane; a Sherwin-Williams sheet warns "Epoxy coatings may darken or yellow."
- The floor stays mostly dry, or you accept a grit additive, which Westcoat urges for any surface "exposed to wet, oily, greasy or slippery conditions."
- You can approve a sample first, as Laticrete states that "Mock-ups and field test areas are required" for its metallic pigments.
- The room can sit empty for 24 hours at 75 degrees F before light traffic and 14 days before full properties, per Sherwin-Williams.
A floor that will be parked on is harder: Westcoat's specification permits "vehicle traffic in 72 hours," but Tennant's maintenance guide calls plasticizer tire marks in a coating "impossible to remove" short of recoating. Compare the systems on the garage floor epoxy page.
How the metallic pattern forms, and what spoils it
The pattern forms by itself as the coat cures, so an installer can steer it but not repeat it. Sherwin-Williams writes that "As the metallic coat cures, the pearlescent pigments disperse" into "one-of-a-kind patterns," and that "Denatured alcohol may be spritzed over the surface to cause incompatibility and create unique metallic effects." The base shows through, since "the color of the basecoat will influence the overall appearance of the floor," per Sherwin-Williams, and Laticrete requires mock-ups before any job. Three site conditions spoil the look.
Oil, silicones or mold release agents cause fisheyes, round spots where the wet coat pulls away from contamination. Air rising from the slab leaves bubbles and pinholes, called outgassing, so Sherwin-Williams advises coating "when the substrate temperature is warmest and the slab temperature will be decreasing," and mixing at "a drill speed of 100-300 rpm" to keep air out of the resin. Laticrete names the site variables itself, "including but not limited to surface preparation, sunlight, humidity, dew point, temperature," and says they "may lead to fisheyes, blistering, pinholes, wrinkling, or outgassing" that "are not product defects." Ask to see the sample panel under the room's own light, and ask what time of day the metallic coat goes down.
Cure times at 72 and 75 degrees F against San Francisco's air
The published cure times are stated at temperatures above San Francisco's normal air, and a colder room takes longer. Sherwin-Williams times its metallic coat at "75 degrees F, 50% relative humidity," and Westcoat's EC-38 sheet, timed at 72 degrees F, says "Do not apply when temperatures are below 50 degrees F or above 90 degrees F." NOAA's 1991-2020 normals for San Francisco Downtown put the normal daily low at 46.6 degrees F in January, 47.9 in February, 48.9 in March, 49.7 in April and 47.0 in December, all below Westcoat's lower limit; the normal daily high stays below 75 degrees F all year, and the SFO station's January normal low is 44.5 degrees F. Those are outdoor readings, and a heated room runs warmer.
Sherwin-Williams' ArmorSeal 1000 HS, an industrial epoxy, needs 48 hours at 50 degrees F before foot traffic, twice the 24 hours it needs at 77 degrees F. Sherwin-Williams says a slightly soft surface "is usually the result of curing in temperatures that are too cold," and that a salamander or torpedo heater will "introduce moisture and carbon dioxide into the area," inviting amine blush, a sticky or waxy film some epoxies grow when cured cold and damp. Its rule is to stay "at least 5 degrees F above the dew point." These normals say nothing about humidity, so the installer's room readings decide.
Permits, the ADU program and the VOC rule for a converted ground floor
The conversion around a metallic floor is what raises permit questions, and San Francisco's own Building Code decides them. SF Planning's ADU page says "Converted ADUs are new units created within existing or proposed space in a residential building," that "you may create living space in your home without creating an ADU," with an affidavit that the space "won't be used as another residential unit," and that an ADU "may not remove housing services, which includes garage, laundry room, storage space." Its State program lists a "60-day review timeframe from date of complete application." Section R105.2 of the State's 2025 California Residential Code exempts "Painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work," but San Francisco replaces that chapter with Chapters 1 and 1A of its 2025 Building Code, so the City's own chapters apply; ask the Department of Building Inspection when unsure.
Separately, the Air District's 2011 advisory is addressed to "MANUFACTURERS, DISTRIBUTERS, SELLERS AND USERS OF ARCHITECTURAL COATINGS." Regulation 8, Rule 3, in its July 1, 2009 text, has a Table 2, effective from January 1, 2011, that prints "Floor Coatings 100" in grams of VOC, the organic vapors a coating gives off, per liter; the federal rule, 40 CFR Part 59, allows 400. Section 8-3-222 describes a floor coating as opaque, so ask which category each layer is labeled under; section 8-3-302.2 applies "the most restrictive limit," with listed exceptions, to a product recommended for more than one category.
Metallic on the bare slab, over a moisture primer, or a stain instead
The slab's moisture reading sets this choice. Sherwin-Williams' Form G-1 draws the line for its resin floors at 3 pounds by ASTM F1869, counted over 24 hours on 1,000 square feet, or at 80% relative humidity by ASTM F2170. A reading under those lines points to the first option, a higher one to the second, and a slab you would rather leave breathing to the third.
Metallic coat on a tested slab
A standard metallic system goes onto prepared concrete: in Sherwin-Williams' package, an 8-mil base coat, a 16-mil wet metallic coat and a urethane topcoat over a CSP 3 profile; in Westcoat's, 38 to 42 mils of dry film. It suits a dry interior room whose slab passed the sheet's test, because "Standard epoxy systems are not moisture-tolerant," as Sherwin-Williams puts it.
Moisture primer, then metallic
A moisture-mitigating epoxy primer goes down first, within limits its makers print. Sherwin-Williams rates Resuprime MVB at 17 mils for up to 100% relative humidity by ASTM F2170 "On concrete that is at least 28 days old," yet its sheet adds "Functioning vapor barrier is required for use," a point to settle on an older slab. Fixr's national January 2025 page prices an added primer, type unnamed, at $2 to $4 per square foot installed. It suits a slab that tests high but meets the primer sheet's conditions.
Stain the slab and let it breathe
A stain colors the concrete itself, and a penetrating sealer can leave the slab free to release vapor; Prosoco says surfaces treated with its Siloxane PD "'breathe' - does not trap moisture." The Air District defines a stain as made "to change the color of a surface but not conceal the grain pattern or texture," so the slab's marks stay. It suits a sound slab whose marks you like, and the stained concrete floors page covers stains and sealers.
Metallic Epoxy Floors FAQs
How much is a metallic epoxy floor in San Francisco?
No survey prices San Francisco, so the figures are national. This Old House's March 2026 cost page lists metallic floors at $5 to $12 per square foot in an add-on table, Bob Vila's April 2024 table prints $5 to $12 as materials only, and This Old House's March 2026 garage remodel guide puts patterned custom epoxy at $15 to $25 a square foot. Fixr's national January 2025 page adds $2 to $4 per square foot installed when a primer is needed. Your own figure comes from the installer's written quote.
How long will epoxy last on a floor?
In HomeGuide's February 2026 national survey, solid epoxy lasts 10 to 20 years, a survey's wording rather than a test result, and the makers tie a floor's life to its upkeep. Westcoat says its Liquid Dazzle system "should be resealed with the appropriate Westcoat topcoat every 3 to 5 years depending upon traffic and UV exposure." Stonhard's epoxy lifespan article gives no figure and names what wears a floor: grit, rough brushes or pads, chemical attack and heavy traffic. Westcoat's care line is a daily dust mop or "a neutral pH cleaner," and Laticrete credits walk-off mats with longer floor life.
Can a garage converted to a room take a metallic floor?
Yes, once the slab's moisture reading falls inside the chosen sheet's limit and the conversion has its approvals. SF Planning's ADU page says many units are converted from garage space and that living space can be added without creating an ADU. A metallic system needs days of cure in an empty room, so ask the installer to schedule it after the other trades finish, and ask the Department of Building Inspection which permits the conversion needs.
Is a metallic floor slippery when wet?
It can be, and the makers say so. Westcoat "highly recommends the use of a slip-resistant additive" for coatings that may see wet, oily or greasy conditions. Sherwin-Williams says silica, polypropylene or aluminum oxide in the topcoat gives "a modest degree of slip-resistance" and that urethane enamel topcoats are "inherently less slippery than epoxy finishes." Ask whether the system has a published wet friction value, and walk on a wet sample panel with the additive in it before the pour.
Do I need a licensed contractor for a metallic floor in California?
Yes, unless labor and materials total under $1,000 and the job needs no permit and no hired help: Business and Professions Code section 7048 exempts only such jobs, and CSLB's bulletin #24-07 says the unlicensed person "cannot employ anyone for the project." CSLB's D-12 synthetic products definition covers "resin and epoxy application" without naming floors, so check both the license and its class on CSLB's site before you sign.
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