Proposed ACHD Impact Fee Changes Could Reshape Development Costs Across Ada County
Transportation infrastructure rarely grabs headlines in the commercial real estate world. But behind the scenes, road funding policies can play a major role in determining where development happens — and how much it costs.
A new proposal from Ada County Highway District could significantly change how infrastructure costs are distributed across Ada County.
According to reporting by Idaho Press (you can read the original article here: https://www.idahopress.com/news/local/achd-proposal-seeks-to-split-county-into-two-areas-assess-differing-impact-fees/article_832d3406-a856-48f5-ad1e-4210ec219023.html), the agency is considering a plan to divide the county into two separate impact fee service areas.
If adopted, the change could alter development costs across different parts of the Treasure Valley — potentially influencing where future projects occur.
For those watching Boise commercial real estate, this proposal is more than a policy update. It could reshape how developers evaluate opportunities across the region.
What ACHD Is Proposing
Under the current system, Ada County operates under a single service area for transportation impact fees. Developers pay a one-time fee when new projects are built, and the funds are used to support major roadway infrastructure across the county.
The new proposal would split the county into two service areas:
- East service area: parts of Boise and Garden City
- West service area: Meridian, Eagle, Kuna, Star, and remaining portions of Boise and Garden City
The dividing line would run roughly along Cole Road.
Under this structure, impact fees collected in one service area would be used only for transportation projects within that area.
This represents a shift from the current countywide model, which pools funds and distributes them where infrastructure needs are greatest.
Why the Impact Fees Could Change
Impact fees help pay for major transportation infrastructure tied to growth, including:
- new road construction
- roadway widening projects
- bridge replacements
- major roadway reconstructions
However, these fees cannot be used to fix existing deficiencies in the road system.
The proposed changes are tied to ACHD’s required Capital Improvement Plan update, which projects transportation infrastructure needs through 2045.
The plan highlights a major difference between the eastern and western portions of the county.
Projected infrastructure needs include:
- East service area: about three hundred thirty-five million dollars in eligible projects
- West service area: about one billion two hundred eighty million dollars in projects
Much of the difference comes from where growth is expected to occur in the coming decades.
Growth Patterns Are Driving the Infrastructure Divide
The eastern side of Ada County includes downtown Boise and older parts of the region where many major road improvements have already been completed.
By contrast, the western side of the county continues to experience rapid expansion.
Cities such as:
- Meridian
- Eagle
- Star
- Kuna
have seen significant residential and commercial growth in recent years.
Because these areas are still building out road networks, they require far more new infrastructure investment.
Transportation planners also used GPS travel data to analyze where trips begin and end across the county. Even when the county is divided into two service areas, most travel still occurs within the same general region.
That data helped support the case that separate infrastructure funding zones could make sense.
How Fees Could Affect Development
For developers and property owners, impact fees are a significant part of the cost structure for new projects.
One example highlighted in the proposal involves fast food restaurants with drive-through lanes.
Currently, these projects pay roughly thirteen thousand dollars per thousand square feet.
Under the draft proposal:
- West service area fees could rise to about thirty-eight thousand dollars
- East service area fees could increase to around twenty-two thousand dollars
Changes would also affect other development categories, from single-family homes to shopping centers.
While the increases are tied to infrastructure demand, they also reflect rising costs in construction and land acquisition.
Since 2021, ACHD has seen major increases in:
- construction materials
- contractor bids
- right-of-way land purchases
These cost increases are being factored into long-term infrastructure planning.
What This Means for Boise Commercial Real Estate
From a Boise commercial real estate perspective, transportation impact fees play a direct role in shaping where development occurs.
Higher fees can influence decisions about:
- site selection
- project feasibility
- building size and design
- tenant mix in retail projects
For example, if fees are significantly higher in certain areas, developers may shift their attention to markets where development costs are lower.
At the same time, higher infrastructure investment often supports long-term growth, which can increase property values and economic activity.
Local Market Impact
Ada County’s rapid growth has already pushed development further west across the Treasure Valley.
New residential communities, retail centers, and industrial parks continue expanding into cities like Meridian, Star, and Kuna.
If the proposed fee structure is adopted, developers may begin analyzing projects based on service-area cost differences.
This could influence where future retail leasing in Boise, multifamily housing, and mixed-use development occur.
Infrastructure investments tied to the Capital Improvement Plan — including roadway expansions on corridors such as Fairview Avenue and Cloverdale Road — could also unlock additional development opportunities.
My Take: Infrastructure Policy Quietly Shapes Real Estate Markets
Transportation infrastructure rarely gets the same attention as large development projects or corporate relocations.
But in reality, road funding policies often have a major influence on the Boise development landscape.
Impact fees directly affect the cost of building new housing, retail centers, and office projects.
When those costs change, developers adjust their strategies.
If ACHD moves forward with separate service areas, it could introduce a new layer of complexity for developers evaluating projects across Ada County.
For investors and developers in Boise commercial real estate, it will be important to monitor how these policies evolve — because infrastructure planning today often shapes where growth happens tomorrow.
Mike Gioioso (joy-OH-so) has for 16+ years been helping companies of all sizes buy, build, and lease perfect places for business in greater Boise, Idaho and beyond.
www.streetsmartidaho.com mike@streetsmartidaho.com 208-209-9166
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