Installing photovoltaic support piles typically costs between $15 to $80 per linear foot, but don't let those numbers fool you – solar foundations are like snowflakes, no two projects are exactly alike. The final price tag depends on a fascinating cocktail of geology, engineering requirements, and. Each type varies in cost, installation process, and suitability depending on soil conditions and project requirements. Type of Piling System Used The type of pile selected significantly impacts cost. In regions where steel or concrete is readily available, these materials may be preferred for economic reasons. Labor and Installation Fees, 3. Each material has unique benefits and price points, tailored to meet the demands of different.