Garage conversion rules in Lynn, MA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a Lynn garage into living space requires a building permit under the MA Building Code (780 CMR). A conversion to a rentable unit must meet Lynn's ADU rules, and no garage may sit closer than the district's front setback.
Turning a garage into habitable space in Lynn requires a building permit under the statewide MA Building Code (780 CMR), which governs egress, insulation, ceiling height, smoke and CO alarms, and electrical work. If the converted space becomes a separate dwelling, it is an accessory dwelling unit and must satisfy the 2025 Lynn Zoning Ordinance Section 9.B: by right on single-family lots, no larger than 900 square feet or 50% of the main home, and one added parking space unless near transit. Under Section 6.8.a, no garage may be placed nearer to the front street line than the district's minimum setback. Off-street parking eliminated by the conversion may need to be replaced.
Converting a garage without permits triggers a stop-work order and retroactive permitting with penalties. An unpermitted living unit that fails egress or fire-safety code is uninhabitable until corrected.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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