Twin Falls County, ID Zoning Overlays & Bonuses: Density Bonus Law (2026)

Planned unit developments in Twin Falls County start at the density the base zone allows; section 10-3-6 says PUD density defaults to that base-zone number, with the Comprehensive Plan, the project's findings of fact, and this chapter's density bonus provisions all factored into the final call. Section 10-3-7 is where the bonus itself lives: the Planning and Zoning Commission may approve up to fifty percent more density than the base zone allows, but only if three conditions are met. The PUD must comply with every other provision of the zoning ordinance except what this chapter specifically permits to vary, health and other governmental authorities must sign off on the water and septic or sewer systems serving the added units, and the property needs adequate access from an adjoining public street with an internal circulation design that keeps traffic safe and efficient.

Section 10-3-8 adds a separate density-clustering tool: the Commission can approve or require clustering so that development avoids floodplains and other environmentally sensitive parts of the site, moving up to one hundred percent of a portion's allowed density onto another part of the same PUD, so long as the resulting density does not harm neighboring properties and the design still meets the PUD's objectives. That density can never leave the PUD itself; the chapter expressly bars transferring density to a separate parcel outside the development.