How Fall River Handles Accessory Structures: A Practical Guide

Fall River maintains 40 local ordinances across all categories, and 4 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Fall River falls on the strict-to-permissive spectrum compared to other cities.

Carport Rules

Fall River regulates carports under Chapter 86 (Zoning) of the City Code, with accessory-structure setbacks set out in Section 86-446 (garages and sheds) and the General Regulations of Article VI. A detached private garage or shed must sit at least 20 feet from the street line, 6 feet from any building, and 4 feet from side and rear lot lines. Maximum height is 18 feet and a detached garage foundation may not exceed 750 square feet or 12% of the lot area, whichever is less. Building permits are issued by Fall River Inspectional Services under 780 CMR.

Key details: Zoning Section: Ch. 86, Sec. 86-446. Street Line Setback: 20 ft. Side/Rear Setback: 4 ft (detached). Max Height: 18 ft (detached). Max Foundation: 750 sf or 12% lot.

Building a carport without the required Inspectional Services Department building permit, or placing it in violation of the Section 86-446 setbacks, the 18-foot height cap, or the 750 sf / 12% lot-area foundation limit, can lead to stop-work orders, code-violation citations, and required removal or after-the-fact permitting. The Fall River Zoning Board of Appeals hears variance requests under MGL c.40A, §10 when a proposed carport cannot meet the dimensional standards. Civil fines for zoning violations are assessed under MGL c.40, §21D and the City's non-criminal-disposition schedule.

ADU Rules

Under Massachusetts law (Ch. 358 of Acts of 2024, effective Feb 2025), ADUs under 900 sq ft are allowed by right on single-family lots statewide. Fall River Mayor Coogan raised concerns about the law but it applies regardless. ADUs must have a separate entrance and cannot exceed half the principal dwelling's floor area or 900 sq ft.

Key details: State Law: Ch. 358 Acts of 2024 — by right. Max Size: 900 sq ft or 50% of principal dwelling. Effective Date: February 2, 2025. Owner Occupancy: Cannot be required by municipality.

Municipalities cannot deny conforming ADU applications. Unpermitted ADU: standard building code enforcement under 780 CMR.

Garage Conversions

Garage conversions in Fall River require compliance with the zoning code and building permits. Attached garages must maintain a 20-foot street setback and 4-foot side/rear setback or the minimum district setback, whichever is greater. Conversions to living space must meet 780 CMR building code requirements.

Key details: Permit: Building permit required. Setback (Street): 20 feet minimum. Setback (Side/Rear): 4 feet or district minimum. ADU Option: By right if under 900 sq ft (state law).

Unpermitted conversion: code enforcement. Must bring to code or restore. Safety violations: immediate correction.

Shed Rules

Fall River's Zoning Code Ch. 86 regulates sheds as accessory structures. Unattached sheds must be set back 20 feet from the street line, 6 feet from any building, and 4 feet from side and rear lot lines. Maximum shed size is 200 square feet. Maximum height for unattached structures is 18 feet.

Key details: Max Shed Size: 200 square feet. Street Setback: 20 feet. Side/Rear Setback: 4 feet. Max Height: 18 feet.

Unpermitted structure: retroactive permit with penalty. Setback violation: modification or removal. Habitation: immediate correction.

The Bottom Line

Fall River's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Fall River is broadly strict or permissive.

Keep in mind that Fall River can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.