Idaho Falls, ID Accessory Structures: Garage Conversions (2026)

Converting a garage to living space in Idaho Falls is regulated by the city's Title 11 Comprehensive Zoning ordinance and building permit rules. The zoning code is explicit on accessory dwelling units: conversion of a garage into an accessory dwelling unit is not permitted unless the required parking can be provided elsewhere on the lot. Because an ADU requires one off-street parking space in addition to the principal dwelling's minimum parking, removing a garage that supplied that parking forces the owner to provide replacement parking on the lot before a conversion can proceed. Beyond the ADU-specific rule, any conversion of a garage into habitable or conditioned space changes the building's use and triggers a building permit so the city can verify the work meets adopted building codes and eastern Idaho snow and wind loads, and that the lot still satisfies zoning standards such as yard setbacks and minimum off-street parking for the dwelling. Owners should confirm their zone (for example RP, R1, or RMH for ADUs) and whether the resulting unit would be treated as an ADU subject to the 750-square-foot cap, owner-occupancy, and deed-restriction requirements. Contact Community Development Services before starting work to confirm what permits and parking your specific conversion requires.