Twin Falls County, ID Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Governing section
- Twin Falls County Code § 8-6D-5(D)
- Zone
- Rural Residential (RR)
- Height trigger
- 35 feet
- Setback increase
- 1 ft added per 5 ft over 35 ft
- Base front/rear yard
- 30 feet
- Base side yard
- 7 feet (25 ft on corner street side)
Summary
Twin Falls County does not cap building height outright in its Rural Residential zone; instead, County Code § 8-6D-5 makes thirty-five feet the threshold that triggers bigger yards, adding one foot of front, side, and rear setback for every five feet a building climbs above that height.
D. Yards: Residential and other uses: 1. Front: A minimum front yard depth of thirty feet (30') shall be provided for all buildings except where a building exceeds a height of thirty five feet (35'), the front yard shall be increased one foot (1') in depth for each five feet (5') of height exceeding thirty five feet (35'). 2. Side: A minimum side yard depth of seven feet (7') shall be provided on each side of the main building located on an interior lot except where a building exceeds a height of thirty five feet (35'); the side yard shall be increased one foot (1') for each five feet (5') of height exceeding thirty five feet (35'). The side street yard of a building located on a corner lot shall not be less than twenty five feet (25'). 3. Rear: A minimum rear yard depth of thirty feet (30') shall be provided for all buildings except where a building exceeds a height of thirty five feet (35'), the rear yard shall be increased one foot (1') in depth for each five feet (5') of height exceeding thirty five feet (35').
Full Breakdown
In the unincorporated county's Rural Residential (RR) zone, Article D of Title 8, Chapter 6, the baseline yards are a 30-foot front yard, a 7-foot side yard on an interior lot (25 feet for the side street yard on a corner lot), and a 30-foot rear yard. Section 8-6D-5(D) then ties height directly to those setbacks: any building over thirty-five feet triggers an automatic increase of one additional foot on the front, side, and rear yards for every five feet the structure exceeds thirty-five feet, so a building fifty feet tall would need three extra feet on each of those yards.
The identical formula appears in the county's Agricultural Range Preservation Zone under § 8-6A-5(D), showing this sliding-scale approach is the county's general method for controlling height in its base rural zones rather than a flat ceiling. Two overlay districts do set outright caps: the Canyon Rim Overlay District limits any structure to thirty-five feet under § 8-6G-4(C), and the Airport Overlay caps buildings at thirty-five feet under § 8-6H-4(E), though the zoning administrator may allow more height there under federal aviation regulations. Outside those overlays, in the base Rural Residential zone there is no absolute ceiling on a building's height, only an escalating cost in yard space for building taller.
Violations & Fines
Twin Falls County enforces zoning violations, including exceeding a district's yard and height standards, on an escalating schedule under § 8-3-2(B): a $50 per day infraction for a first violation, $100 per day for a second violation within two years, and a misdemeanor carrying up to a $1,000 fine and six months in jail for a third violation within two years, with each day counted as a separate violation.
Frequently Asked Questions
Is there a maximum building height in unincorporated Twin Falls County's Rural Residential zone?
How much extra setback do I need for a tall home?
Does any part of the county cap height outright?
What happens if I build higher without adding the extra setback?
Sources & Official References
Other rules in Twin Falls County
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