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.”