ADU rules in Lake County, IN — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Unincorporated Lake County allows two ADU forms: a detached backyard cottage (special exception in A-1 and R) and an interior secondary suite (permitted in A-1 and R). Both cap floor area at 49% of the home or 580 sq ft and require owner occupancy.
Under UDO No. 2560 Article 9, a backyard cottage is a detached accessory dwelling approved as a special exception in A-1 and R districts on lots with a detached house (154-9-030). A secondary suite is an ADU wholly within a detached house, permitted in A-1 and R (154-9-040). Only one ADU per lot; not allowed on two-unit or multi-unit lots. Floor area may not exceed 49% of the principal dwelling or 580 sq ft. Backyard cottages set back 10 ft from side/rear lines, max 24 ft tall. Lots without central sewer need Health Department approval. An owner with 50%+ interest must occupy one unit; a deed restriction is recorded before permitting. Incorporated cities set their own ADU rules.
Zoning violations draw a 15-day cure notice; if uncorrected, citations may reach $2,500 for a first violation and $7,500 for a second, per IC 36-1-3-8. Each day is a separate offense.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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