In most jurisdictions, retaining walls under 3 or 4 feet do not need to undergo a plan check or permitting. However, since the provisions differ between locations, it's best to find out first.

Diamond Pro Air is a versatile product with a solution for any project challenge, ideal for building retaining walls up to 12 feet tall. Weighing only 54 lbs. per 1-square-foot block, it is ...