Allen County, IN Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Allen County, IN, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Max accessory height
- 25 feet
- Size cap (<2-acre septic lot)
- Smaller than primary building
- Placement
- Behind primary building line
- Rear-yard projection
- Up to 4 feet
- Permit
- Improvement Location Permit
Summary
In unincorporated Allen County, a detached accessory building such as a shed may not exceed 25 feet in height. On residential lots under two acres with on-site sewage, a new detached accessory building must be smaller than the primary building, and a shed generally requires an Improvement Location Permit.
On lots of less than two (2) acres served by an on-site sewage system, new detached accessory building square footage shall be less than the square footage of the primary building. Height (maximum): Accessory building 25 [feet].
Full Breakdown
Under the Allen County Zoning Ordinance (Title 3, Article 2), the maximum height of an accessory building is 25 feet, versus 40 feet for the primary building. On lots of less than two acres served by an on-site sewage system, new detached accessory building square footage must be less than the square footage of the primary building. A shed is a listed residential accessory structure and must sit behind the primary building line; it may project into the required rear yard up to four feet under the yard-projection standards. An Improvement Location Permit from Planning Services confirms setback and district compliance before construction.
Violations & Fines
Erecting an oversized or improperly placed shed, or skipping a required Improvement Location Permit, is a zoning violation subject to correction notices, fines, and removal orders by Planning Services.
Frequently Asked Questions
How tall can a shed be in unincorporated Allen County?
Does my shed need a permit?
Sources & Official References
Other rules in Allen County
How Allen County compares: Shed Permit Requirements by City·Compare Allen County to another location·View the Indiana accessory structures overview
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