Product types include poured concrete walls, gravity walls, cantilever retaining walls, gravity poured walls, gabions, crib retaining walls, welded wire walls, plantable walls, and pre-cast walls.
Anyone with a strong back can stack up a bunch of blocks and build a pretty retaining wall. But it takes skill and planning ...
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 ...