Interlocking blocks, also called modular concrete blocks, cost $15 to $30 per square foot on average, about 25% to 50% less than poured concrete.

How much does a single concrete block cost?

Cinder blocks don't vary much in cost regardless of the type. While some capstones can cost as little as $0.95 apiece, the average cost of a cinder block is $1 to $3 each.

Which is cheaper poured concrete or blocks?

Poured concrete foundations cost more than CMU block foundations. Contractors may find it difficult, time-consuming, and costly to truck in wet concrete to the job site. Poured concrete can crack and leak if not prepared correctly.