Keystone Granite

During our independent research, we found that Keystone Granite offers countertop fabrication using most of the popular types of natural and engineered stone available in the US. The most commonly used materials include engineered quartz, marble, granite, quartzite, soapstone, and onyx — these are the materials most frequently chosen by Keystone Granite’s clients in San Antonio, TX for kitchens, bathrooms, outdoor areas, and commercial spaces in 2025.

If a client requires a less common material, the desired stone is ordered from a supplier, allowing the project to meet the customer’s specific requirements. This approach enables the company to complete both standard and unique designer projects.

According to our research, the company fabricates stone countertops for both residential and commercial spaces. The most in-demand options are, of course, kitchen countertops in private homes, bathroom vanities, as well as outdoor kitchens and BBQ areas. In addition to that, the company manufactures countertops for commercial spaces such as offices, retail stores, hotels, restaurants, and even medical facilities.

Thanks to its experience, Keystone Granite is ready to fabricate and install stone countertops in virtually any residential or commercial space — even if the specific type of room wasn't mentioned among the most common ones.

Our rating analysts thoroughly reviewed the portfolio of completed projects by Keystone Granite, which features various types and shapes of stone kitchen countertops fabricated by the company. Among the completed projects are classic straight countertops, L-shaped and U-shaped corner configurations, kitchen islands, and countertops with a breakfast bar.

The examples we studied confirm that the company is capable of fabricating and installing countertops in virtually any shape — tailored to the kitchen layout, design objectives, and customer preferences.

Our research has shown that the company works with the most popular stone countertop styles in the U.S., including modern, traditional, transitional, minimalist, industrial, farmhouse, luxury, and coastal. These styles are currently in high demand among clients across the country.

Our analysts reviewed the company’s portfolio and customer feedback and confirmed that Keystone Granite successfully handles a wide range of design tasks — from clean, minimalist solutions to luxurious interior compositions featuring expressive stone textures.

The company’s office is located at 18975 Marbach Ln #291, San Antonio, TX 78266, but its work is not limited to just the city of San Antonio, TX. Like many participants in our rating, the company accepts orders, provides on-site measurements, and installs stone countertops within a radius of up to 50 miles from its main location — including neighboring cities, suburbs, and residential communities.

If you’d like to confirm whether your location is covered, simply contact the company through our website: submit a request, give them a call, or send a message directly via messenger.

Like many participants in our rating, Keystone Granite works with a wide range of clients — from private homeowners to professionals in the construction industry. Their clients include families planning a kitchen or bathroom renovation, contractors, developers, and owners of cafés, restaurants, hotels, and other commercial properties where stone countertops are needed.

For interior designers and contractors, Keystone Granite often offers special partnership terms — such as discounts or priority fabrication timelines. To confirm the details, we recommend contacting the company through our website using any convenient method.

As part of our independent research, we attempted to determine whether Keystone Granite has its own natural stone countertop fabrication facility. Our analyst contacted the company as a mystery shopper, but unfortunately, we were unable to obtain a clear answer — the calls and messages either went unanswered or did not provide the necessary information.

The absence of confirmed data about fabrication should not be seen as a negative sign. In our experience, it is not uncommon for companies to miss some incoming inquiries or choose not to disclose such details during initial contact.

According to our research, Keystone Granite does not offer a veteran discount — this information was provided by a company representative during a conversation with our mystery shopper. However, like most companies in our rating, Keystone Granite may offer personalized terms and discounts on countertop fabrication — especially during national holidays, seasonal promotions, or for large-scale projects.

We recommend confirming the details directly: submit a request, call, or message the company through our website — and be sure to ask about any available discounts. In many cases, contractors are open to discussing individual terms.

Unfortunately, as part of our independent research, we were unable to obtain pricing information from Keystone Granite. Our mystery shopper attempted to contact company representatives to request a quote for the fabrication and installation of a stone countertop measuring 83.4 square feet. However, they were either unable to reach anyone by phone, or never received the promised estimate after the initial conversation.

We want to emphasize that the lack of response or data does not necessarily reflect the quality of the company's work. In our experience, some contractors are simply unable to respond to all inquiries in time or prefer to discuss pricing only in person.
To get accurate and up-to-date pricing for your project, we recommend reaching out to the company directly through our website — submit a request, call, or message them — and ask for a personalized quote.

Yes, according to our research, Keystone Granite offers free consultations and project estimates — this is standard practice across the industry. Like most contractors in our ranking, the company provides free on-site measurements, advises on material selection and configuration, and prepares a detailed quote for the fabrication and installation of your stone countertop.

To receive a consultation and a free estimate for your new countertop, submit a request on our website, call the company, or send a message via messenger.

According to the results of our independent research, Keystone Granite in San Antonio, TX offered one of the fast turnaround times for the fabrication and installation of a stone countertop — 14 business days. Acting as a mystery shopper, our analyst contacted the company with a request to fabricate and install a stone countertop of 83.4 square feet. A company representative stated that the entire project could be completed in 14 business days, which allowed us to classify the company as a contractor with a fast turnaround time.

It’s important to note that the turnaround time quoted to our mystery shopper may differ from the one you receive, as fabrication time depends on many factors — including project complexity, the material selected, and the company’s current workload. We recommend contacting the contractor directly — by submitting a request, calling, or messaging through our website — to confirm the current turnaround time for your specific project.

According to our research, Keystone Granite in San Antonio, TX prepared a project estimate within 14 days. After a phone conversation, our mystery shopper sent the company representative a request for a quote based on a ready countertop project with an area of 83.4 square feet — and received a detailed estimate for the fabrication and installation of the countertop. This level of speed allowed us to classify the company as having a fast quote preparation time.

Please note that quote preparation times may vary depending on current workload, project complexity, and selected material. We recommend submitting a request, calling, or messaging the company through our website to receive a personalized quote and confirm the current turnaround time.

Yes, like most professional contractors in the market, Keystone Granite performs cutouts and countertop preparation for various components — both standard and modern. According to our findings, these services are typically included in the overall project estimate.
The standard scope usually covers cutouts for sinks (undermount, drop-in, or farmhouse) and holes for faucets or other plumbing fixtures. Additional cutouts — such as for cooktops, hidden or pop-up outlets, built-in wireless chargers, or other accessories — are discussed individually at the project planning and estimating stage.

It’s important to note that while the cutouts and countertop preparation are usually performed by the company, the installation of electrical and plumbing fixtures (such as faucets, outlets, or appliances) may not be included in their scope of work and could require licensed professionals. We recommend clarifying this point when placing your order.

To avoid misunderstandings, ask for a detailed estimate with a breakdown of all services: cutout pricing, installation, and any add-on options. This will ensure project transparency and help you clearly understand what you're paying for.

According to our information and industry practice, Keystone Granite, like most participants in the ranking, provides a workmanship warranty valid for 1 year from the date of countertop installation. This period is usually specified in the contract. We do not rule out that the company may have extended warranty terms (2 years or more), however, during our research, we did not receive confirmed data from the contractor regarding the duration and scope of its warranty.

The contractor’s warranty covers defects in fabrication and installation, such as uneven or separating seams, leveling and fastening issues, detachment or sagging of an undermount sink, flaws in edge finishing and cutouts, premature failure of seam materials, and cutouts that do not match the approved design. Warranty coverage does not include damage from use (thermal shock/burn marks from hot cookware, chips or cracks caused by impacts), stains and acid etching (for marble), wear due to insufficient maintenance or lack of sealing, natural characteristics of stone (veins, micro-pores, variations in shade/pattern within tolerances), shifts caused by base deformation, or any modifications performed by third parties.

The material warranty is provided by the manufacturer or the official stone supplier. Engineered quartz brands often offer a limited “lifetime” warranty for residential properties (subject to registration and compliance with care guidelines). For sintered surfaces, typical warranty periods range from 10 to 25 years. Natural stone usually does not come with a factory warranty — its quality of fabrication and installation is covered by the contractor’s warranty.
The term and scope of the warranty depend on the project and materials — contact Keystone Granite in any convenient way on this page to get the current terms.