Retaining Walls: 4 Feet, 7 Feet and 15 Feet
A wall that holds back four feet or more of soil needs a building permit, and the Design Review Board weighs in at seven feet. Walls four feet or taller have to stay 10 feet from a property line, and none may exceed 15 feet without a special permit.
Terraces count as separate walls only if they are spaced at least twice the height of the taller one. The tree bylaw applies to walls covered by this section, so the trees near the wall line belong on the plan.





