Granite Countertop Costs. This is where granite slabs have a distinct advantage. As we noted, the installed price for slab granite countertops is $80-$150 per square foot. The granite tile installation costs can be as low as $50, though up to $75 is fairly common too.The material costs less because the tiles can be produced from smaller pieces of granite. The actual cost of installation is about the same with slab and granite tile.ranite has a timeless beauty that has been admired for centuries and will continue to be a valued countertop material going forward. The major drawback to granite is its cost. At roughly $80-$150 per square foot installed, granite slab countertops are one of the most expensive available.