Impact fees are sums developers pay to ACHD to offset the cost of public infrastructure improvements. The fees help ensure the District's roads, bridges, and sidewalks keep pace with private development.

Impact fees are a key part of our Capital Improvements Plan and fund the majority of infrastructure improvements. These fees are determined by the ACHD Commission through the Impact Fee Ordinance and are charged to property developers or owners as a one-time fee.

Explore the Capital Improvement Plan

Impact Fee Assessment and Tenant Improvement Form

Impact Fee Ordinance 246A

The ordinance defines fees charged to developments to accommodate growth in Ada County.

• Ordinance 246A - ACHD's Impact Fee Ordinance
• Exhibit A - Fee Schedule
• Exhibit B - Methodology

Impact Fee Ordinance 254

The ACHD Commission approved a changes to the Impact Fee Ordinance and related Capital Improvements Plan on December 3, 2025.  The approved ordinance, No. 254, will take effect on March 1,  2026.

• Ordinance 254 - ACHD's Impact Fee Ordinance
• Exhibit A - Fee Schedule
• Exhibit B - Methodology

Individual Assessments

A written Individual Assessment Application must be submitted to the Impact Fee Administrator no later than thirty (30) calendar days after the date of payment of an impact fee. An individual assessment may be completed prior to payment of the impact fee.

• Guidebook for Individual Assessments
• Individual Assessment Application

Appeal a Fee Decision

Impact fees may be appealed. If there are substantial grounds for the appeal, the charges can be revoked.

• Appeal of Impact Fee Decision

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