Summary of Nampa City Code Title 9 (Subdivisions) as it applies in Nampa.
Code evolves continuously. Verify at the official source before any development decision.
Applicable code
Code references active as of publication. Verify current standards at the official source before any development decision.
A minor subdivision is defined as a division of land into four (4) or fewer lots, where no new streets are created and no dedication of public right-of-way is required beyond that necessary for access to the lots.
Investor implication: Minor subdivisions offer a faster, lower-cost path to lot creation for infill and small-scale land plays. No full engineering required if existing street frontage is adequate.
Verify at Nampa City Code Title 9 →A major subdivision is any subdivision that does not qualify as a minor subdivision, including any division of land into five (5) or more lots, or any subdivision requiring the creation of new streets or dedication of public right-of-way.
Investor implication: Major subdivisions trigger full engineering, street dedication, and utility extension requirements. Budget 18-36 months from acquisition to final plat approval.
Verify at Nampa City Code Title 9 →Minimum lot sizes vary by zoning district. R-1 (Single-Family Residential) requires 6,000 square feet minimum lot area. R-2 (Medium Density Residential) requires 5,000 square feet. R-3 (High Density Residential) requires 3,000 square feet per dwelling unit.
Investor implication: Lot size minimums determine maximum lot yield on a given tract. R-3 zoning unlocks the highest density for infill plays.
Verify at Nampa City Code Title 10 →All major subdivisions must dedicate public right-of-way for streets in accordance with the City of Nampa Street Standards. Local streets require 50 feet of right-of-way. Collector streets require 60 feet. Arterial streets require 80 feet.
Investor implication: Street dedication reduces net developable area by 10-20% depending on tract configuration. Factor this into residual land value calculations.
Verify at Nampa City Code Title 9 →All subdivisions must extend water, sewer, and stormwater infrastructure to serve all lots. Developer is responsible for all costs of extension, including oversizing for future development if required by the City.
Investor implication: Utility extension costs vary widely based on distance to existing mains. Budget $15K-$50K per lot for water/sewer extension in greenfield areas.
Verify at Nampa City Code Title 9 →All subdivisions must demonstrate adequate water rights to serve the proposed development. Water rights must be transferred to the City of Nampa or to the applicable water district prior to final plat approval.
Investor implication: Water rights availability is the primary constraint on land entitlement in Northwest Nampa. Verify shares through Pioneer Irrigation District before any acquisition.
Verify at Nampa City Code Title 9 →Renew analysis
Minor subdivisions are the primary tool for small-lot infill in North Nampa and South Nampa where existing street frontage exists. The four-lot cap and no-new-street requirement keep engineering costs under $15K in most cases, versus $150K+ for a major subdivision with street dedication.
Major subdivisions are the path for larger land plays in the Karcher / Midland corridor and Northwest Nampa. The street dedication and utility extension requirements add $200K-$500K+ in hard costs depending on tract size, but unlock higher density under Idaho SB 1352 starter-home allowances effective July 1, 2026.
Idaho SB 1352 (effective July 1, 2026) overrides these minimums for qualifying starter-home subdivisions on tracts ≥4 acres, allowing lots as small as 1,400 square feet. Nampa has not yet adopted local conformance ordinances as of April 2026. Model both pre- and post-SB 1352 scenarios until the city council adopts the local implementation rules.
Water rights are the single biggest entitlement risk in Nampa land plays. Pioneer Irrigation District shares trade at $8K-$12K per acre-foot as of Q1 2026. A 10-acre subdivision typically requires 3-5 acre-feet depending on density. Budget $30K-$60K for water rights acquisition on top of land cost.