Cultured Onyx Countertop Cost: 2026 Installed Price Calculator
Mike Martin, MA CSL, is the founder and construction cost editor of RemodelingExpense. His residential construction experience informs the site’s cost research, calculators, and homeowner project guidance.
Cultured onyx countertop cost ranges from $95 – $245 per sq. ft. installed, or about $1,140 – $2,940 for a 12 sq. ft. vanity top project.
Price depends on prefab or custom molded top size, onyx-look color, integrated bowl, single or double sink layout, faucet spread, backsplash, sidesplash, edge profile, gel coat, demolition, delivery, and installation access.
Cost Calculator
Cultured Onyx Countertop Cost Calculator
Estimate cultured onyx countertop pricing based on countertop square footage, prefab or custom molded top, onyx-look color, integrated bowl, single or double sink layout, faucet spread, backsplash, sidesplash, edge profile, gel coat, demolition, delivery, access, and local labor rates.
Your estimated cost
For 12 sq. ft.
$1,140 – $2,940
About $95 – $245 per sq. ft.
Use your estimate as a starting point, then compare real prices from local contractors.
| Cost item | Low estimate | High estimate |
|---|---|---|
| Materials | $660 | $1,740 |
| Labor | $480 | $1,200 |
| Estimated cultured onyx countertop cost | $1,140 | $2,940 |
| Installed cost per sq. ft. | $95 | $245 |
Why your price may change
- Local labor rates vary.
- Material quality affects the price.
- Old material removal, repairs, permits, or code updates can add cost.
- Hard-to-reach areas, complex layouts, rush jobs, or premium contractors may cost more.
Estimate includes local labor adjustments and may differ slightly from rounded national cost examples.
Cultured Onyx Countertop Cost vs Value
Cultured Onyx Countertop may recover about 35%–65% of its cost.
Bottom line: Cultured onyx countertop pricing depends on countertop square footage, prefab or custom molded top, onyx-look color, integrated bowl, single or double sink layout, faucet spread, backsplash, sidesplash, edge profile, gel coat, demolition, delivery, access, and local labor rates.
Worth it: Bathroom vanity tops, powder rooms, guest baths, cultured stone shower surrounds, integrated sink tops, onyx-look finishes, and homeowners who want a lower-cost alternative to real onyx or marble vanity tops.
Skip it: If you want real translucent stone, backlighting, or a luxury natural slab surface, real onyx countertops are usually the better calculator.
ROI ranges are planning estimates and should not be treated as an appraisal. This is only an estimate. Real resale value depends on your home, neighborhood, market, project quality, and buyer demand.
Contractor Reality Check
Cultured onyx countertop quotes are cheapest when the vanity top is a standard size, the sink bowl is integrated, and the color is a common onyx-look finish. Costs rise with custom molded tops, double bowls, upgraded colors, thicker edges, sidesplash pieces, faucet drilling, old countertop removal, plumbing disconnects, delivery issues, and tight bathroom access.
My rule of thumb: Ask whether the quote includes the cultured onyx top, integrated sink bowl, faucet holes, backsplash, sidesplash, edge profile, delivery, installation, plumbing disconnects, old top removal, and disposal before comparing bids.
What to Confirm Before You Sign
- Top type: Confirm prefab cultured onyx, custom cultured onyx, molded vanity top, or another cultured stone product.
- Onyx-look finish: Ask whether the quote includes standard colors, premium veining, gloss finish, matte finish, or upgraded gel coat.
- Sink layout: Confirm one integrated bowl, two bowls, offset bowl, center bowl, or vessel sink drilling.
- Faucet spread: Confirm 4-inch centerset, 8-inch widespread, single-hole faucet, wall faucet, or custom drilling.
- Backsplash: Ask whether backsplash and sidesplash pieces are included or priced separately.
- Finish quality: Confirm gel coat quality, cleaning restrictions, warranty terms, and whether abrasive cleaners should be avoided.
- Buffer: Budget 10% to 20% for custom sizing, double bowls, sidesplash, faucet drilling, plumbing work, demolition, and access issues.
Surprise Costs That Move the Price
| Item | Why It Adds Cost | Typical Add |
|---|---|---|
| Custom molded vanity top | Custom sizes, nonstandard depths, special colors, and custom bowl placement cost more than standard cultured onyx tops. | $400 – $1,700+ |
| Double bowl layout | Two integrated bowls require a wider top, more material, more faucet drilling, and more plumbing work. | $500 – $2,000+ |
| Backsplash and sidesplash | Matching splash pieces add material, fitting, adhesive, caulk, and finish work. | $100 – $600+ |
| Faucet or drain changes | Changing faucet spread, drain location, shutoffs, supply lines, or trap alignment can add plumbing labor. | $150 – $800+ |
| Old vanity top removal | Removing the old top, sink, faucet, caulk, adhesive, and debris adds labor and disposal cost. | $150 – $750+ |
Cultured Onyx Countertop Cost by Type
| Cultured Onyx Countertop Type | Installed Cost | Best For |
|---|---|---|
| Prefab cultured onyx vanity top | $95 – $150 per sq. ft. | Guest baths, powder rooms, standard vanities, and lower-cost onyx-look bathroom remodels. |
| Custom cultured onyx countertop | $140 – $245 per sq. ft. | Nonstandard vanity widths, custom colors, offset bowls, and better-fit bathroom upgrades. |
| Double bowl cultured onyx top | $1,500 – $4,800+ each | Primary bathrooms, shared bathrooms, wider vanities, and lower-cost double sink upgrades. |
| Cultured onyx with sidesplash | $115 – $275+ per sq. ft. | Vanities against side walls, corner bathrooms, and remodels that need splash protection. |
| Premium cultured onyx top | $160 – $290+ per sq. ft. | Better colors, upgraded veining, thicker edges, custom bowls, and higher-end bath remodels. |
Cultured Onyx Countertop Cost by Project Size
| Project Size | Typical Scope | Installed Cost |
|---|---|---|
| Small cultured onyx vanity | 5 – 8 sq. ft. | $475 – $1,960 |
| Standard single vanity top | 9 – 14 sq. ft. | $855 – $3,430 |
| Double vanity or custom top | 15 – 25 sq. ft. | $1,425 – $6,125+ |
Are Cultured Onyx Countertops Worth It?
Cultured onyx countertops are worth it when you want an onyx-look bathroom surface with an integrated sink bowl, smoother cleaning, and a lower installed price than real onyx stone. They work well in powder rooms, guest baths, vanity replacements, shower-adjacent bathroom projects, and remodels where a molded cultured surface makes more sense than natural slab fabrication.
Skip it: If you want real translucent stone, backlighting, or a luxury natural slab surface, real onyx countertops are usually the better calculator. Compare the Onyx Countertop Calculator. If you want a lower-cost molded vanity top, compare the Cultured Marble Vanity Top Calculator. For a broader bathroom material comparison, use the Bathroom Vanity Top Calculator.
References – Cultured Onyx Countertop Cost
- National Kitchen and Bath Association: Kitchen and Bath Planning Resources
- Bathroom Vanity Top Product Pricing: The Home Depot
- Bathroom Vanity Top Product Pricing: Lowe’s
- Construction Laborer Wage Data: U.S. Bureau of Labor Statistics
- Tile and Stone Setter Wage Data: U.S. Bureau of Labor Statistics
Last Updated: 6/26/26
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