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GNL Granite Design started its journey as GNL Contractors and it was founded at the owner’s backyard. It was in 2010, that this family-owned invested in a larger building at 195 Commercial Square, located in the heart of the east side of Slidell, Louisiana.  

The owners, Neivair Castilho and his wife, Cristina Dellarrosa, came up with GNL as a symbolic way to show their love to their children: Gustavo, Natalia e Leticia.  

Since then, we have built loyal and long-terms customer and partner’ relationships throughout the years and we are very proud to have the best reputation in our area, accumulating 133 Google Reviews that only grows every day. 

superfícies de granito
Image by Dana DeVolk

GNL works with big contractors and partners with reseller stores but it’s with our neighbors that we are proud of doing business with! We have fabricated and installed thousands of projects with a beautiful variety of granite, quartz, quartzite, and marble that is hand-selected by our owner. GNL provides material from quartz suppliers, including Vicostone, Silestone, Caesarstone, Cambria and M.S.I. GNL has the largest inventory of all the fabricators in the area!


We use the most sophisticated technology in the industry at every step in the process, from laser to installation. 

Our fabrication and installation teams have extensive experience integrating technology and artistry to create the perfect countertop for each client. We treat each project like a work art, striving to help our clients realize their vision for their countertops in a timely manner and at a competitive price. Our sales representatives assist each client through each step of the process to ensure consistent communication and a smooth experience. Our customer experience is our strongest skill and we are in continuous improvement to make sure our customer is always happy! 

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