Onyx typically costs $40-$250 per square foot for the stone alone and about $100-$350 per square foot installed, depending on color, thickness, fabrication, and project size. Onyx price per square foot is highest for rare translucent slabs, intricate edge work, and small jobs that require substantial cutting or special handling.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Onyx slab material | $40 per sq ft | $100 per sq ft | $250 per sq ft | Grade, color, thickness, and slab source matter |
| Fabricated countertop | $100 per sq ft | $200 per sq ft | $350 per sq ft | Includes typical measuring, cutting, and installation |
| Onyx wall cladding | $80 per sq ft | $180 per sq ft | $300 per sq ft | Preparation and mounting method affect labor |
| Onyx floor tile | $10 per sq ft | $25 per sq ft | $60 per sq ft | Tile material only; installation is extra |
| Countertop installation labor | $35 per sq ft | $70 per sq ft | $120 per sq ft | Complex seams, cutouts, or access can raise rates |
What Onyx Slabs Cost Installed for Counters
For a standard kitchen or bathroom counter, buyers commonly pay $100-$350 per square foot installed, with a typical midrange quote around $200 per square foot. A 30-square-foot vanity or compact counter may total $3,000-$10,500 before unusual plumbing changes, while a larger 50-square-foot project can reach $5,000-$17,500.
The lower end generally assumes a readily available color, standard ¾-inch slab, uncomplicated edges, and normal access. A typical quote includes slab material, templating, fabrication, and placement, but may exclude sink, faucet, backsplash, demolition, plumbing reconnection, and sales tax. Assumptions: standard residential access, common slab selection, and no structural or plumbing changes.
Budget around $150-$250 per square foot for many straightforward installed projects, then confirm what the quote includes. Prices above $300 per square foot are more likely when the slab is rare or highly figured, the job needs bookmatching, or fabrication requires extra reinforcement and careful handling.
How Slab, Fabrication, and Labor Shape the Quote
Onyx is a natural stone, so the price is not determined by area alone. Fabricators may quote the slab by the piece, by the square foot, or as a package that includes cutting and installation. Comparing bids requires separating the material allowance from fabrication and field labor.
| Quote component | Typical price | What it covers | Common price trigger |
|---|---|---|---|
| Onyx slab | $40-$250 per sq ft | Stone selection and raw material | Rare colors, strong veining, thicker stock |
| Fabrication | $25-$70 per sq ft | Cutting, edge finishing, and polishing | Curves, custom edges, precise vein matching |
| Installation labor | $35-$120 per sq ft | Transport, placement, and seam work | Stairs, difficult access, heavy or fragile pieces |
| Equipment and reinforcement | $150-$800 per project | Supports, handling equipment, or added backing | Large panels and unsupported overhangs |
| Removal and disposal | $10-$30 per sq ft | Taking out and hauling away old counters | Heavy existing stone or limited access |
| Sink and cooktop cutouts | $150-$450 each | Cutting and finishing an opening | Unusual shape or delicate edge details |
A labor estimate can be checked as . Fabrication shops may use a blended per-square-foot rate instead, so the formula is most useful for assessing a separate labor line. A typical two-person crew may charge $75-$150 per hour combined, with fabrication often priced independently.
Request itemized pricing for slab, fabrication, cutouts, installation, and removal. A low material price can be offset by high shop charges, while a bundled quote may be competitive if it clearly identifies the slab and includes templating, delivery, and installation.
Why Thickness, Veining, and Cutouts Change Onyx Pricing
Stone selection is one of the strongest price drivers. Common cream, honey, or green-toned onyx can fall near $40-$120 per square foot for material, while distinctive red, pink, blue, or strongly patterned slabs may cost $150-$250 or more. Slabs are not uniform: a buyer may pay a premium for a consistent pattern or for two pieces that align across a seam.
Thickness changes both material and handling needs. A ¾-inch slab is a common counter choice; 1¼-inch stock or a built-up edge can add roughly 10%-30% to material and fabrication charges. Onyx is softer and more prone to cracking than many granite options, so large pieces may need backing or reinforcement, typically adding $150-$800 per project.
Project area also affects the unit rate. A 10-square-foot vanity can cost more per square foot than a 40-square-foot counter because templating, delivery, and setup are spread over less stone. More than three cutouts, a curved front, a waterfall edge, or seams in a highly visible area can add $300-$1,500, depending on design and shop rates.
Specify exact thickness, finished dimensions, cutouts, and seam locations before comparing bids. For a slab with pronounced veining, ask whether the quote includes a matching layout; a visually aligned installation may use more material and generate additional waste than a basic straight-cut job.
Which Onyx Features Add the Most to the Final Bill
Backlit onyx is a specialty application rather than a standard slab installation. LED panels, a light-diffusing backing, wiring, and access for maintenance can add about $30-$100 per square foot beyond the stone and ordinary installation. Electrical work may add another $300-$1,200, especially if a new circuit or concealed driver location is required.
For backsplashes and walls, the substrate and mounting method matter. A small backsplash under 20 square feet may have a minimum fabrication or installation charge of $500-$1,500 even when the per-square-foot rate looks moderate. Larger wall panels, generally 4 feet or more in one dimension, may need mechanical support and extra crew time.
Local site conditions add charges that are easy to miss. A second-floor walk-up, long carry from the truck, narrow stairwell, or restricted delivery window can add $150-$600 or more. Old counter removal typically adds $10-$30 per square foot, while plumbing disconnection and reconnection may cost $150-$500 when not included.
Confirm whether the price includes lighting, backing, access charges, and disposal. A written scope should identify who handles electrical and plumbing work, whether the installer protects adjacent cabinets, and what happens if a slab is damaged during handling.
How Labor Time and Crew Size Affect Onyx Installation
A simple vanity top may take a crew a few hours to place after shop fabrication, while a full kitchen installation commonly requires 4-8 on-site hours for a two- or three-person crew. Templating and fabrication happen earlier; the full order can take one to three weeks after slab selection, depending on shop workload and whether a special slab must be sourced.
Labor rates vary by city and trade. In many U.S. markets, countertop installation labor works out to about $35-$120 per square foot, or $75-$150 per hour for a two-person crew where hourly pricing is used. Dense urban areas and high-cost coastal markets can exceed these ranges, particularly when parking, building access, or scheduling rules complicate delivery.
Onyx handling can require more careful placement than a routine granite job. A large island or full-height wall panel may need additional workers or lifting equipment, adding $300-$1,500. A job requiring multiple visits for templating, cabinet corrections, and installation can also incur separate trip or minimum charges of $100-$300.
Ask the installer to state crew size, expected visit count, and any access fee. This makes an apparently low per-square-foot quote easier to compare with a complete installed price.
Three Onyx Project Quotes for Different Room Sizes
The examples below use illustrative midrange pricing, not fixed national rates. Each assumes ordinary residential access and standard installation. Material selection, local labor, tax, and job complexity can move the final quote substantially.
| Project | Area and scope | Estimated price | Example calculation |
|---|---|---|---|
| Bathroom vanity | 12 sq ft, common color, one sink cutout | $1,800-$3,600 | $150-$300 per sq ft installed |
| Kitchen counters | 40 sq ft, standard edge, two cutouts | $6,000-$12,000 | $150-$300 per sq ft installed |
| Backlit feature wall | 24 sq ft, selected slab, lighting included | $5,500-$10,800 | $230-$450 per sq ft with lighting |
For a 40-square-foot kitchen, a representative estimate might include $4,000 in slab material at $100 per square foot, $1,600 in fabrication, $2,000 in installation and handling, and $600 for two cutouts. That produces a $8,200 subtotal, or about $205 per square foot, before tax or removal of existing counters.
Use the project total as well as the unit rate when reviewing estimates. A quote can appear inexpensive per square foot but omit cutouts, removal, or a minimum fee. Conversely, a higher rate may include delivery and installation that another bid lists separately.
Onyx Versus Quartz, Marble, and Onyx-Look Porcelain
Onyx is selected for its distinctive translucence and natural pattern, but it generally requires more careful use than quartz or porcelain. Installed onyx commonly runs $100-$350 per square foot; quartz often falls around $60-$150, marble around $70-$200, and onyx-look porcelain around $50-$160. Local availability and finish can shift all of these ranges.
Quartz is nonporous and typically needs less routine sealing, making it a practical lower-maintenance counter choice. Marble offers natural veining but can etch from acids and may require sealing. Porcelain can reproduce an onyx appearance at a lower price and is less prone to staining, though large-format panels still need experienced handling and may have costly edge fabrication.
For a small vanity or decorative wall, genuine onyx may justify its premium where the pattern or light transmission is central to the design. For a heavily used kitchen, a buyer can compare a less prominent onyx accent with quartz or porcelain on the main work surfaces. A carefully limited onyx area can reduce the stone budget without giving up the feature.
Compare the maintenance and repair allowance, not only the initial installed price. Ask whether a substitute is full-body porcelain, printed surface material, or a different natural stone; appearance and durability differ even when sample colors look similar.
How to Reduce an Onyx Countertop Quote Without Losing the Look
Keep the layout simple and minimize waste. A rectangular counter with standard corners is less expensive to template and cut than a curved design. Reducing the number of seams, cutouts, and decorative edges can save $300-$1,500 on a mid-sized project, depending on the original scope. Ask the fabricator to show how the selected slab will be laid out before approval.
Choose a readily available slab rather than a rare color that must be sourced from a distant supplier. Ask about remnants for a vanity, niche, or short backsplash; suitable remnant material may cost 20%-50% less than buying a full slab, although fabrication and installation minimums still apply. For a larger room, confirm that the remnant is big enough to avoid an awkward seam.
Prepare the site before delivery. Clear access paths, remove personal items, and confirm cabinets are level and adequately supported. Cabinet correction or additional reinforcement can cost $200-$1,000 when discovered late. Get at least three itemized quotes using the same dimensions, slab grade, edge profile, and cutout count so that the comparison reflects equivalent work.
Control the stone area and scope before negotiating the unit price. Retaining an existing backsplash, skipping unnecessary backlighting, or using onyx only on a vanity can save more than selecting a slightly cheaper edge profile. Avoid choosing a slab solely from a small sample; inspect the full slab to reduce surprises and potential rework.