Newton, MA Fence Regulations: Retaining Walls (2026)

2 of Newton's Chapter 30 Zoning Ordinance defines a retaining wall as a wall or terraced combination of walls 4 feet in height or greater built to hold back a mass of earth at a higher elevation. The ordinance closes an obvious workaround: a berm sloped at 1:1 or greater counts as a retaining wall for permitting purposes, so grading a steep earthen slope instead of building a masonry wall does not avoid the rule. Height is not measured wall-by-wall when a homeowner or contractor stages several shorter walls in a series: if retaining walls sit within 25 feet of each other, front-face to front-face, the code measures cumulative height from the foot of the lowest wall to the top of the highest one, closing another common permit workaround.

Any wall reaching the 4-foot threshold requires a special permit from the City Council rather than a simple building permit sign-off. C: that the lot's topography is challenging enough that it could not be improved without retaining walls, that the wall will not adversely impact the adjacent property, neighborhood, or public, and that the proposed wall is the minimum structure necessary for reasonable use of the property. The section also cross-references Revised Ordinances Chapter 29, Article VIII, as amended, for additional requirements outside the zoning code itself.

The current retaining-wall text was last amended by Ordinance No. C-42 on April 16, 2024, within a Zoning Ordinance whose overall volume carries a December 1, 2025 amendment date. Property owners planning a wall near this threshold should apply for the special permit before excavation or wall construction begins, since the Commissioner of Inspectional Services cannot issue a building permit for work that would violate Chapter 30.