Gabion Retaining Wall Design Ideas 1/ Built using rounded river boulders. 2/ Engineer designed retaining walls. 3/ Requires good drainage and concrete foundations 4/ Gabion retaining wall could be an alternative. 5/ Gabions supplied in kitsets delivered to your door. 6/ Easy to assemble and low cost retaining walls 7/ Check out the Retaining wall design guidelines. 8/ Check out our 100's of prices and sizes