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Lynn, MA Fence Regulations: Retaining Walls (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Frontage-area wall height cap
4 feet
Behind-frontage wall height cap
6 feet
Behind front setback
no height limit
Minimum wall separation
4 feet
Fine
$300 per violation per day
Enforcing agency
Building Commissioner (ISD)

Summary

Lynn's Zoning Ordinance caps retaining walls in the frontage area at four feet, requires four feet of horizontal separation between stacked walls, and allows unlimited height behind the required front setback. Inspectional Services enforces the limits under Section 7.B.2.

a. Fences and retaining walls located in the frontage area of a lot may be up to four feet in height. On corner lots, the frontage area includes both the primary and secondary frontage. Successive retaining walls must be built with a minimum horizontal separation distance of four feet.

b. Fences and retaining walls located behind the frontage area, internal to the lot, may be up to six feet in height, unless required as screening.

c. Retaining walls may be built to any height behind required front setbacks.

View official code

Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.

Full Breakdown

2 of the 2025 Lynn Zoning Ordinance, adopted by the City Council on June 24, 2025, sets the height rules for retaining walls citywide. In the frontage area of any lot, a retaining wall may rise no more than four feet; on a corner lot, the frontage area covers both the primary and secondary street frontages, so the four-foot cap applies along both sides. Where a property needs more than one retaining wall to manage grade in that frontage area, successive walls must be separated by a minimum horizontal distance of four feet, preventing a single vertical face taller than the code allows.

Behind the frontage area, internal to the lot, retaining walls (like fences) may reach six feet unless the wall doubles as required screening. c removes the height cap entirely, letting property owners retain steep rear or side grades without a maximum. 2, which bars erecting any structure until the Building Commissioner issues a permit. a. 1.

Violations & Fines

Violating the height or separation limits is a zoning violation under Section 11.B. The Building Commissioner issues written notice and can order removal of a non-compliant wall. Conviction carries a $300 fine per violation, with each day the wall remains in violation counted as a separate offense, plus costs and legal fees; the City may instead pursue noncriminal disposition under G.L. c.40, § 21D.

Frequently Asked Questions

How tall can a retaining wall be in my front yard in Lynn?
Up to four feet in the frontage area, per Zoning Ordinance Section 7.B.2.a. On a corner lot, that four-foot cap covers both the primary and secondary street frontage, so both visible sides of the property share the same limit under the ordinance adopted June 24, 2025.
Do I need a permit to build a retaining wall in Lynn?
The ordinance only exempts fences under seven feet from a Building Permit (Section 7.B.1.b); retaining walls are not named in that exemption, so they fall under the general rule in Section 11.A.2 requiring a permit from the Building Commissioner before any structure is erected.
Can I build a tall retaining wall behind my house in Lynn?
Yes. Section 7.B.2.c removes the height cap entirely for retaining walls built behind the required front setback line, unlike the four-foot cap that applies in the frontage area. Walls elsewhere behind the frontage area that are not used for screening can reach six feet under Section 7.B.2.b, giving Lynn property owners real flexibility for grading rear yards.
What happens if my retaining wall doesn't meet Lynn's height rule?
The Building Commissioner can issue a written violation notice ordering you to bring the wall into compliance or remove it. A conviction carries a $300 fine per violation under Section 11.B.3, and each day the wall stays out of compliance counts as a new offense.

Sources & Official References

Other rules in Lynn

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All Lynn rules

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