Kuna Infill Development Guide

Kuna's zoning code establishes residential districts (R-1, R-2, R-4, R-6, R-8, R-12) with minimum lot sizes ranging from 12,000 sq ft (R-1) to 3,000 sq ft (R-12). Mixed-use and commercial districts allow residential components subject to design standards.

Investor implication: Old Town's Avenue B-G grid concentrates R-4 through R-8 zoning, where lot-split economics pencil on parcels 8,000+ sq ft with alley access or corner geometry. R-12 designations (3,000 sq ft minimum) exist but are limited; most infill underwriting targets R-6 (5,000 sq ft) or R-8 (4,000 sq ft) zones where ADU + lot-split combinations deliver highest per-acre yield.

March 2025 Future Land Use Map update added Medium Density Residential (MDR) and Mixed-Use designations across northeast and northwest growth corridors, expanding entitlement envelope for multi-unit and mixed-use projects.

Investor implication: MDR and Mixed-Use additions concentrate along King Road (north) and Deer Flat Road corridors. Parcels in these zones now support townhome, small-lot subdivision, and vertical mixed-use entitlements that were previously limited to single-family only. Entitlement clocks are faster than Meridian's for comparable density.

Ordinance 2026-05A (effective April 7, 2026) allows ADUs up to 900 sq ft or 50% of primary dwelling square footage, whichever is less. Owner-occupancy requirement removed. Parking waived within 1,500 feet of transit. Alley-facing ADUs permitted with reduced setbacks.

Investor implication: Removal of owner-occupancy unlocks rental-product ADU underwriting. Old Town parcels with alley access can now support detached ADUs at 3-foot rear setbacks, maximizing buildable envelope. Parking waiver within 1,500 ft of transit (Avenue B-G grid qualifies in most cases) eliminates the need for additional off-street spaces, reducing site development costs.

Idaho SB 1352 requires cities over 10,000 population to allow residential development at minimum 12 units per acre on tracts of 4 acres or larger. Lots as small as 1,400 sq ft permitted. Setback and lot-width requirements do not apply to qualifying starter-home subdivisions.

Investor implication: SB 1352 overrides local minimum lot-size restrictions on tracts ≥4 acres, enabling small-lot subdivision product that was previously blocked by R-4 or R-6 zoning minimums. Kuna's Old Town grid is mostly built out in smaller parcels, but North Kuna and Area of Impact assemblages ≥4 acres can now deliver 12+ units/acre regardless of underlying zoning, provided they meet starter-home price thresholds.

Kuna City Code Title 5 governs lot splits and minor subdivisions. Lot splits creating two parcels from one are permitted administratively if both resulting parcels meet minimum lot size, setback, and access requirements for the underlying zone. Minor subdivisions (3-4 lots) require Planning & Zoning Commission review.

Investor implication: Lot-split economics depend on parcel-level geometry: alley access, utility stub locations, and setback compliance. Old Town parcels 8,000+ sq ft with alley access are the highest-conviction targets. Mid-block corner lots and parcels adjacent to existing utility stubs reduce site development costs and accelerate entitlement timelines.