Idaho Falls Impact Fee Structure Shifts to Square Footage Model Starting June 1
IDAHO FALLS, Idaho — Developers and builders working in Idaho Falls will face a revised residential impact fee structure beginning June 1, following an update to the city’s fee ordinance approved by the Idaho Falls City Council on April 23.
The most significant change under the updated rules is a shift away from assessing impact fees on a per-unit basis. Instead, fees will now be calculated according to the square footage of a residential development — a method the city says more accurately reflects the true demand a given project places on public infrastructure.
What Impact Fees Fund
Impact fees in Idaho Falls are used to help pay for parks, transportation systems, and public safety facilities required to serve new development. The city first adopted an impact fee structure in 2022. Officials say the fees are structured so that growth covers the cost of the infrastructure it creates, rather than placing that financial burden on existing residents and taxpayers.
Past and current projects supported through impact fee revenue include the growth-related portions of the Idaho Falls Police Complex, a northside fire station, Heritage Park improvements, Utah Avenue roadway work, a pathway along the Idaho Canal south of Sunnyside Road, and Holmes Avenue improvements.
Community Development Services Director Wade Sanner noted the city’s continued expansion makes updated infrastructure planning essential. “Impact fees play an important role in our city by providing a way for new developments to contribute to the cost of public facilities and infrastructure resulting from growth,” Sanner said in a statement released by the city.
Why the Change Now
City officials say the square footage-based model is designed to produce a more proportional fee assessment — larger homes and buildings that generate heavier demand for roads, parks, and emergency services would pay more than smaller units, a departure from the flat per-unit approach.
Bonneville County and the Idaho Falls area have seen sustained residential and commercial development pressure in recent years, creating ongoing demand for expanded public services and infrastructure. The updated fee structure is intended to ensure that demand is matched by adequate funding from the projects generating it.
Additional details, including the revised ordinance and the impact fee study supporting the changes, are available through the City of Idaho Falls website. Developers and contractors with projects underway or in planning are encouraged to review the updated schedule before the June 1 effective date.
The impact fee update comes as Idaho Falls and surrounding Bonneville County communities navigate a range of local governance and planning decisions. Voters in the area also recently weighed in on local races, including a contested 7th District judicial seat and several legislative primary contests that will shape representation heading into the next legislative session.
What Comes Next
The new square footage-based residential impact fee structure takes effect June 1, 2026. Building permit applications submitted on or after that date will be assessed under the updated schedule. Developers, builders, and property owners planning new residential construction in Idaho Falls should account for the revised fee calculations in their project budgets and timelines.