How much do onyx countertops cost?
Ashburn, VA

How much do onyx countertops cost?

Ashburn, VA

How much do onyx countertops cost?

$50 – $200cost per square foot installed
$1,500 – $8,000average total cost installed (30 – 40 SF)

Get free estimates for your project or view our cost guide below:

$50 – $200 cost per square foot installed

$1,500 – $8,000 average total cost installed (30 – 40 SF)


Get free estimates for your project or view our cost guide below:
Are you a pro? Get new customers
Jennifer Carlson
Written by
Jennifer Carlson
Edited by
Kristen Cramer
Fact-checked by
Tom Grupa

Onyx countertop cost

Onyx countertops cost $50 to $200 per square foot with installation or $1,500 to $8,000 total on average, depending on the color and slab size. Onyx is a type of translucent stone that can be used as a kitchen counter or bathroom vanity. Popular colors include green, black, and tan.

Onyx countertop cost by size
Kitchen size Countertops square footage Average cost installed
Small kitchen (70 – 100 SF) 20 – 30 $1,000 – $6,000
Average kitchen (100 – 200 SF) 30 – 40 $1,500 – $8,000
Large kitchen (200+ SF) 40 – 60 $2,000 – $12,000

Onyx countertop prices are $40 to $150 per square foot for materials only and $50 to $200 per square foot with installation. The following options may increase final costs:

  • Edge cut – Countertop edge designs typically cost extra. Square and no-drip edges are the cheapest, while Ogee and Dupont are the most expensive options.

  • Sealing – Countertop installers typically charge $100 to $300 total or $2 to $7 per square foot to seal porous onyx counters.

  • Removing existing counters – Many contractors include old countertop removal and disposal in their estimate, while some charge up to $10 to $15 per square foot for this service.

Onyx countertop colors

Onyx comes in a variety of colors and patterns, including:

  • Green

  • Black / Gray

  • Tan / Brown

  • Cream / Off-white

  • Pink

  • Red

Kitchen island with green onyx countertops.
Kitchen island with green onyx countertops.

Cost to install onyx countertops

Onyx countertop installation costs
Item Cost per square foot Average cost (30 – 40 SF)
Onyx slab materials $40 – $150 $1,200 – $6,000
Labor to fabricate & install $10 – $50 $300 – $2,000
Total cost to install $50 – $200 $1,500 – $8,000

The following factors affect the installation cost:

  • Made-to-order – Custom or cut-to-order countertops cost more than prefabricated counters.

  • Cutouts – Contractors cut holes in countertop materials for a sink, faucet, cooktop, or outlet. Some prefab countertops come with pre-cut holes.

  • Plumbing disconnect –A plumber or the countertop installer may need to disconnect and reconnect existing sections of plumbing. Plumbers charge $45 to $150 per hour.

  • Sink installation – A sink replacement costs $330 to $1,300 with labor, materials, and old sink removal.

  • Underlayment and reinforcement – Onyx countertops typically come with a fiberglass underlayment for added strength.

  • Cabinet leveling – Kitchen or bathroom cabinets may require adjustment in order to support the weight of the onyx.

  • CooktopCooktop installation costs $700 to $1,600 for labor and materials.

  • Backsplash / end splash – Adding a matching onyx backsplash or end splash costs extra. A traditional tile backsplash costs $10 to $50 per square foot, including labor and materials.

Cost of onyx countertops installed by location

Onyx countertop cost by location
Surface Size (inches) Average cost installed
Small kitchen counter (each) 25 x 100 $850 – $3,400
Average kitchen counter (each) 25 x 170 $1,500 – $5,900
Kitchen island 40 x 80 $1,100 – $4,400
Small kitchen island 24 x 48 $400 – $1,600
Bathroom vanity top 20 x 36 $250 – $1,000
Bar top 16 x 36 $200 – $800
Bathroom tile flooring 60 x 96 $2,000 – $8,000
Kitchen tile flooring 120 x 120 $5,000 – $20,000

Onyx countertop prices vs. quartz, granite, & marble

Onyx countertops cost $1,500 to $8,000 on average with installation, compared to the average cost of countertop installation at $1,500 to $6,000 for other materials.

Compare the installed cost of onyx countertops with the cost of other popular materials:

Countertop prices by material
Countertop material Cost per square foot installed Average total cost installed (30 – 40 SF)
Onyx countertops cost $50 – $200 $1,500 – $8,000
Granite countertops cost $80 – $150 $2,400 – $6,000
Quartz countertops cost $50 – $200 $1,500 – $8,000
Marble countertops cost $40 – $150 $1,200 – $6,000
Solid surface countertops cost $50 – $150 $1,500 – $6,000
Butcher block countertops cost $50 – $150 $1,500 – $6,000

Pros and cons of onyx countertops

Pros and cons of onyx countertops
Pros Cons
  • Unique patterns
  • Variety of colors
  • Long lasting
  • Prone to scratching and staining
  • Expensive

Frequently asked questions

What are onyx countertops?

Onyx is a natural stone made mostly of calcite. Because it is more translucent than other stones, it provides a smooth and reflective finish that accentuates lighting. Onyx countertops come in a variety of colors and unique patterns.

Can you use onyx for kitchen countertops?

Yes, you can use onyx for a kitchen countertop. However, it requires regular maintenance and is not as durable as other materials. Onyx may be better suited to a bathroom or backsplash.

Where to buy onyx countertops?

You can buy onyx countertops online or from specialty countertop stores. Because onyx is a less-common premium material, stores like Home Depot and Lowe's typically do not sell it.

How long do onyx countertops last?

Onyx countertops last 100+ years if properly maintained.

Getting estimates from onyx countertop installers

Before hiring an onyx countertop installation companies near you, make sure to:

  • Get at least three detailed estimates to compare.

  • Look for a National Stone Institute (NSI) accredited contractor specializing in onyx countertop installation.

  • Check reviews on HomeGuide and Google.

  • Hire a licensed, bonded, and insured company that has been in business 5+ years.

  • Ask for references with contact information.

  • Ask for a portfolio of previous onyx countertop installations.

  • Get a detailed contract and warranty in writing before the project starts.

  • Follow a payment plan instead of paying in full before the job is complete.

Questions to ask

  • What experience do you have with onyx countertop installation?

  • Are you NSI-accredited?

  • Are you licensed, bonded, and insured?

  • What does the quote include?

  • What added costs might I expect?

  • How long will the installation take?

  • Does this installation require a permit? If so, will you handle it?

  • How would you handle any damages that happen on the job?

  • Do you require a deposit? If yes, how much is it?

  • Do you offer a warranty? If so, what does it include?