The average cost of solar panel roof tiles is $15 to $35 per square foot, including installation. Premium brands, such as Tesla, can be more expensive. 00 per watt, which would mean total installation costs of $25,000 to more than $70,000 for a standard-sized home. Brand and technology are huge factors; aspirational products like Tesla's solar roofs tend to live at the top. Conventional solar panels offer the lowest cost and quickest payback period in most cases, but not all homeowners like their appearance. On the other hand, solar shingles and tiles are discreet options that integrate with your roof, but their cost per watt of capacity is higher. This can fluctuate between 30 and 60 percent.