Average minimum cost of interlocking driveway pavers for 300 square feet: $1,800. Average maximum cost of interlocking driveway pavers for 300 square feet: $2,160. Costs for interlocking driveway pavers can fall into several categories. The first category is the price to purchase the pavers and the other necessary materials. The pavers are sold by numerous manufacturers at various quality levels. An average paver costs from $1.23 to $1.50/sf. The substrate for a 1,000-square-foot driveway would cost more than $500, and the concrete would cost around $75. Joint sand would cost under $50. The second category is cost of installation.