Summary of Kuna City Code Title 5 lot-split / minor subdivision provisions as it applies in Kuna. Reference: https://library.municode.com/id/kuna.
Code evolves continuously. Verify at the official source (https://library.municode.com/id/kuna) before any development decision.
Applicable code
Code references active as of publication. Verify current standards at the official source before any development decision.
A lot split divides an original tract to create no more than three parcels total (the original tract plus up to two new lots). Lot splits are processed administratively and do not require Planning & Zoning Commission review if all dimensional and infrastructure standards are met.
Each resulting lot must meet the minimum lot size, width, and depth requirements of the underlying zoning district. In R-2 Low Density Residential (the most common district for lot splits), minimum lot size is 7,000 square feet with 70-foot minimum width and 100-foot minimum depth.
All lots created through a lot split must have direct access to public streets with installed sidewalks, curbs, gutters, and street lighting. Each lot must connect to city water and sewer systems. Storm drainage facilities must be provided per city engineering standards. If existing infrastructure is deficient, the applicant must upgrade or install required improvements as a condition of approval.
Each lot must have a minimum of 20 feet of frontage on a public street or approved private access easement. Flag lots (lots with narrow access strips) are permitted if the access strip meets minimum width requirements and provides recorded access to all lots. Shared driveways serving multiple lots require recorded cross-access easements.
Lot splits must provide utility easements along all lot lines where utilities are or will be located. Standard easement widths are 10 feet for water and sewer lines, 15 feet for storm drainage, and 20 feet for electrical transmission. Easements must be recorded on the final plat and shown on all building permit site plans.
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Lot splits offer the fastest path to creating buildable inventory in Kuna without triggering full subdivision platting. The three-lot cap means you can double or triple density on qualifying parcels with minimal entitlement risk, but you cannot create a four-lot subdivision through this process.
A standard 14,000 sq ft R-2 lot (70' × 200') can be split into two conforming 7,000 sq ft lots. Parcels smaller than 14,000 sq ft or with irregular dimensions may not qualify without a variance, which converts the lot split into a discretionary process and adds 60–90 days.
Infrastructure costs can exceed $50,000 per lot if you're splitting a parcel on an unimproved street or in an area without city sewer. Always confirm existing infrastructure status with Kuna Public Works before acquisition. Parcels in Old Town Kuna or established subdivisions typically have all utilities in place; parcels near the Area of Impact boundary often do not.
Flag lots allow you to split deep parcels without full street frontage on the rear lot, but the access strip must be at least 20 feet wide and cannot count toward the buildable area of either lot. This is common in Old Town Kuna where original platting created deep lots along Avenue B through G.
Easement placement directly affects buildable area and setback calculations. A 10-foot utility easement along the rear property line effectively increases the rear setback by 10 feet, reducing the buildable envelope. Always request a utility map from Kuna Public Works before finalizing lot split geometry.