Cornerstone Granite

During our independent research, we found that Cornerstone 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 Cornerstone Granite’s clients in Westminster, CO for kitchens, bathrooms, outdoor areas, and commercial spaces.

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, Cornerstone 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 Cornerstone 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 Cornerstone 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 5440 Lincoln St, Denver, CO 80216, but its work is not limited to just the city of Westminster, CO. 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, Cornerstone 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, Cornerstone 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.

According to our independent research, Cornerstone Granite does indeed operate its own countertop fabrication facility. As part of our mystery shopper verification process, our analysts contacted company representatives, asked detailed questions, and inquired whether a visit to the facility was possible. A company employee confirmed that the production site exists and that clients are welcome to visit to see the materials and fabrication process firsthand.

In our team’s view, having an in-house fabrication facility is a strong indicator of a company’s professional level. It means the company controls key stages of the process, can efficiently produce custom pieces, and ensures consistent quality at every step.

Yes, based on the results of our research, Cornerstone Granite offers discounts for veterans — this information was confirmed by a company representative during a conversation with our mystery shopper. We believe this isn’t the only discount available: like most participants in our rating, the company may offer personalized terms — 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 don’t forget to ask about current 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 Cornerstone 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, Cornerstone 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 our independent research, Cornerstone Granite in Westminster, CO offered one of the fastest fabrication and installation timelines for a stone countertop — just 10 business days. Acting as secret shoppers, our analysts contacted the company with a request for the fabrication and installation of a stone countertop measuring 83.4 square feet. A company representative informed us that the entire project could be completed in just 10 business days, which allowed us to categorize this contractor as having a fast turnaround time.

Please note that the timeframe quoted to our secret shopper may differ from what you are offered, as the production timeline depends on many factors — including project complexity, chosen material, and the company’s current workload. We recommend confirming the current timeline directly by submitting a request, calling, or messaging the contractor through our website.

In the Mystery Shopper research on file, quote preparation at Cornerstone Granite was rated Very Fast. The recorded request and quote response fall on the same calendar day. This assessment is separate from the fabrication and installation timeline.

It’s important to note that the time required to prepare an estimate may vary depending on the company’s current workload, the complexity of the project, and the chosen material. We recommend submitting a request, calling, or messaging the company through our website to get a personalized quote and clarify the current turnaround time.

Yes, like most professional contractors in the market, Cornerstone 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, Cornerstone 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 Cornerstone Granite in any convenient way on this page to get the current terms.