ADU rules in Linn County, IA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Unincorporated Linn County allows one ADU by-right per parcel with an existing single-family home. Max 1,200 sq ft or 50% of the principal dwelling, whichever is larger. Recently expanded from 800 sq ft.
Linn County Unified Development Code Chapter 107, Article VI Section 107-113(e) governs ADUs in unincorporated areas. ADUs may be detached, attached, part of an accessory structure, a tiny house or manufactured home on a permanent foundation taxed as real estate, or interior to the principal dwelling. ADUs require complete independent living facilities including a kitchen, bathroom, and independent access. Iowa Code Chapter 335 grants counties zoning authority; Iowa has no statewide ADU mandate, so each county sets its own rules. Cities within Linn County (Cedar Rapids, Marion, Hiawatha) regulate ADUs separately under their own codes.
Unpermitted ADUs are subject to enforcement under Linn County UDC Chapter 107. Contact Linn County Planning & Development at 319-892-5130 for specific penalty information.
Linn County, IA
Linn County does not publish a stand-alone decibel-based noise ordinance for unincorporated areas; instead, Iowa Code section 727.6 (disturbing the peace) an...
Linn County, IA
Iowa has no statewide cap on residential fence height. In unincorporated Linn County, fences are regulated through Chapter 107 of the County Code (the Unifie...
Linn County, IA
Linn County's animal control rules for unincorporated areas are set in Chapter 6 of the Linn County Code of Ordinances and a separate county ordinance (Chapt...
Linn County, IA
Iowa Code §727.2 (HF 540, 2017) legalized consumer fireworks but lets counties limit use to July 3, July 4, and December 31. Linn County Resolution 2019-5-83...
Linn County, IA
Linn County's Unified Development Code (Chapter 107, Article IV) requires off-street parking for residential dwellings in unincorporated areas but does not i...
Linn County, IA
Linn County's Unified Development Code (Chapter 107) does not set a short-term-rental-specific occupancy cap in unincorporated areas. Iowa Code Section 414.1...
See how Linn County's adu rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.