Cosmos Marble & Granite
2nd year as a Best Pick
certified company
Based on 77 reviews
Our Certification Process
Best Pick Guarantee
Verified License(s)
Verified General Liability Ins.
Verified Workers' Comp
2nd year as a Best Pick Call
"Cosmos Marble & Granite is a family-owned company, and our goals are unsurpassed customer service and excellent craftsmanship. Our friendly staff and years of experience will leave you 100 percent satisfied with your project."

John Karagiorgos | Owner
Company Information
Services Offered
Cosmos Marble & Granite fabricates and installs natural stone surfaces in kitchens, bathrooms, bars, fireplaces, apartment complexes, office buildings, restaurants, and other large venues. The company carries a full range of natural stone products such as granite, marble, onyx, quartz, soapstone, and quartzite in addition to a variety of tile selections.
Cosmos offers a 100 percent customer satisfaction guarantee.
Company History
The family-owned-and-operated company has served the Philadelphia area for 25 years.
Cosmos is an EPA Lead-Safe Certified Firm, and a member of the National Kitchen & Bath Association.
Employee Information
Employees drive marked vehicles and undergo background checks.
Additional Information
Cosmos carries products from Cambria, Silestone, HanStone, Zodiaq, and more.
Areas Served
Montgomery County, Chester County, The Main Line, Bucks County, Delaware County
A selection of 77 homeowner reviews:
“Cosmos Marble is very good—excellent. Their customer service and punctuality are tremendous, and their cleanliness and expertise are excellent. I'd give them an A+.”
“It was great. Using them was the best experience we had with our kitchen. They're the best. I have already recommend them to friends. I'd give them A+ ratings all across the board.”
“They're definitely A+. I'd recommend them to anybody. The quality of the work stood out to me, and the material and the way everything's done are perfect.”
“Cosmos was awesome. They deserve an A+. I've already recommend them to friends.”
“We love them. I'd give them an A+. We've recommended them.”
“They were terrific. I'd give them an A+. We're very happy.”
“We liked everything. They were great. We loved them. They made a little mistake, but they fixed it, and we're thrilled with that. Right now, we're looking at it; it's lovely. We don't have any complaints. I'd give them A grades across the board.”
“They're an A+ company. I liked the whole experience from buying, picking up the stone, and to the templating to the installation. They were easy to do business with. I'm extremely likely to recommend them to friends.”
“I'd grade it excellent.”
“I'm very satisfied with Cosmo's. On a scale of one to ten, they get an eleven. The guys did a very good job. The only way those guys do a couple is excellent. Everything was excellent.”
“Their quality of work was good, excellent. Same with their customer service, punctuality, cleanliness, and expertise. I'm very likely to recommend them.”
“They're an A+ company.”
“I'd definitely give them an A+ rating.”
“I'd give them an A+ grade.”
“It was fine. They did good. I'd give them an A.”
“I'd rate them an A.”
“I'd give them an A, definitely.”
“It was great. I have no complaints whatsoever and I'd be likely to recommend them to a friend.”
“I'd give them a ten. Their expertise was very good. I'm likely to recommend them to a friend.”
“I'd give them an A. They're fine. They're close by and they were easy to talk to and deal with.”
“They were really patient with me because I had to come back and forth a couple times. Unfortunately, they didn't have the granite I wanted. I had to settle for something different, but that's no fault of their own, and they had something that also worked. They came and installed it, did a beautiful job, and they were there if I needed them. They installed a granite countertop in my mom's kitchen with a 42-inch sink and a faucet. They get an A+.”
“They're doing some work for us which isn't done yet because we went out of town, but so far, they've done everything they said they would do. They've been on time and professional. The guy is extremely courteous, has explained everything to me, and cleans up. We're just waiting for the top now, assuming that it fits like it should, and then everything will be gravy. They're doing a vanity countertop for a bathroom. I'd give them an A at this point because it's been great.”
“They were very accurate and on time. They tried to work out the best way to fit our needs. They did a countertop for us, and I'd give them an A.”
“They're good, so I was satisfied with their work on the granite countertop on my kitchen. They get an A.”
“Everything was timely and conducted in a timely manner, and they did a good job. They did kitchen countertops for a U-shaped kitchen, so three large counters and a bar. Everything was precisely as we ordered it. They let us come and pick out the marble ourselves from the yard where they had them all outside. They were an A—no complaints.”
“I really enjoyed their turnaround time. They were really quick with getting out and actually installing the stone. They did a white quartzite countertop in the kitchen. I chose them because they were the closest company to me. We have recommended them to family and friends already, so hopefully they use them. I'd give them an A.”
“They were prompt when the guys came and did the job, and everything went smooth, so it was fine. They installed a granite countertop for me, and it looks fine, though the overall job's not done. Their work is done, but the project is still in progress. I would recommend Cosmos to family and friends, and I'd give them an A.”
“I had a positive experience with them.”
“They did a good job.”
“Everything was quick. The guy said he was going to come, and then he came exactly the same day. They came on time and did everything the same day, so they did a good job.”
“They were very prompt, on time, and did a very neat job with the full countertops for me. I'd rate them as an A.”
“They did a good job installing new countertops in my kitchen and got it done right the first time. I'd give them an A.”
“They were just very professional. They did our laundry room stonework and granite countertops. I'd give them an A.”
“They did the kitchen counter job well, fast, and courteous. They get an A.”
“They were thorough, so it was a good experience. There was one cut on the granite countertop in the laundry room that didn't come out the way they liked, so they took it back, corrected it, and then it was good. They get an A because I have no complaints.”
“They were very professional. We told them what we wanted for the bathroom, and they were very good with the consultation for design and colors. They narrowed down options and showed us different slabs to get an idea of what it was we were looking for, and then we came up with two that we ultimately selected, one of which was the bathroom. We had the countertops in our master suite replaced with marble ones. They also created thresholds from the bedroom into the bathroom, from the bathroom to the shower room, and from the bathroom to a walk-in closet. They also created a threshold for the shower itself, and a ledge that's adjacent to the bathtub. They did a lot of different pieces for us, and I'd definitely rate them as an A.”
“The guys who came to do the installation were prompt, on time, very friendly, and professional. They installed granite kitchen countertops for me, and I would recommend them. They get an A.”
“They dealt with everything nicely and handled it in a timely fashion. They did a granite countertop for a vanity in the bathroom, and it was a small job, but a job done right. I'd probably give them an A.”
“I'll give them an A.”
“Cosmos Marble & Granite was really great. We didn't know what to look for, but they were very thorough, nice, and helpful in explaining the granite, amounts, and color schemes. The installation went great, too. The installers were very nice and respectful, and the design turned out amazing. We're really happy with it. They put granite countertops in our kitchen, and I would definitely rate them as an A+.”
“We're really enjoying our new kitchen. Cosmos Marble & Granite did a fabulous job, and all three men were very courteous. They were fantastic, and the job really turned out perfect. They did two twelve-foot marble countertops, and the workmanship was really well done. They earned an A.”
“They were awesome and perfect, and their service was excellent. They did a granite countertop, and I'd give them an A.”
“Cosmos was timely and great. They gave me kitchen counters, and those counters look beautiful today. I'd give them an A.”
“Cosmos did work for me. My wife was home at the time, and she said they did an excellent job. They were very courteous, and they were in and out at the right time, so everything was good. We had to have our kitchen completely redone because we had a pipe leak, so they redid all the tops of the cabinets, the bottoms of the cabinets for the sink, and the whole thing. I'd rate them an A.”
“I liked their personalized service. They're small enough to care but big enough to get the job done. The job was an entire house, basically. They did all the vanities for bathrooms, all the stonework for the fireplace mantles, and all the countertops for my kitchen. They also did shower stalls. It was a tremendous amount of work. They earned an A.”
“I liked everything about them. They were very helpful and did a really nice job. They installed a granite counter top in our laundry room. I'd rate them A.”
“They had a nice selection, and they were really easy to work with, so basically it was good from start to finish. They did countertops for me in the kitchen, and I chose them because the contractor recommended them. I have no complaints. I'd give them an A.”
“I liked everything about Cosmos. They were great to deal with, and their work was really good. They did countertops for me. I'd rate them A with no complaints.”
“The installer was friendly, courteous, and neat. They installed a granite slab for a breakfast bar, and they did grade-A work.”
“Cosmos did granite countertop work for me. They were easy to work with and very knowledgeable. If there was a problem, they corrected it. They get an A.”
“I liked their quality of work, and they were punctual. They were on time and did it very quick. They did a reception desk in granite and two kitchens for me in granite. I rate them an A.”
“I have nothing but good things to say about the countertop job they did for me. I'd give them an A.”