Ask most business owners what a commercial building costs and they will think about two numbers: the land and the construction. Those are the visible costs, the ones that show up in early conversations and back-of-napkin math.

They are also, depending on the project, only part of what actually gets spent before a certificate of occupancy is issued. The rest lives in a category most people outside the development world never think about until they are in the middle of it: the fees, studies, infrastructure requirements, and regulatory obligations that come attached to putting a new commercial building on a piece of ground in a growing market.

Understanding those costs early changes how you evaluate a site, how you budget a project, and in some cases whether you build at all.

Impact Fees: Paying for the Growth You Create

The principle behind impact fees is straightforward. New development generates new demand on public infrastructure. More cars on roads, more load on sewer and water systems, more calls for police and fire service. Impact fees are how jurisdictions ask new development to pay its proportional share of expanding that infrastructure rather than passing the full cost to existing taxpayers.

In Ada County, the Ada County Highway District administers transportation impact fees across essentially every jurisdiction in the county. That structure is unusual nationally, and it generally works in a developer’s favor because it produces one consistent standard rather than a patchwork that changes at every city limit.

The fee itself is calculated by land use category and scale. A medical office building generates a different trip count than a warehouse, which generates a different count than a fast food restaurant with a drive-through. The fee schedule reflects those differences, and the gap between categories can be substantial. Drive-through restaurants and high-traffic retail sit at the expensive end. Warehouse and industrial uses sit considerably lower.

Those fees are assessed during permitting and typically must be paid before a building permit is issued, which makes them a cash flow consideration and not just a line on a pro forma.

ACHD updated its impact fee schedule relatively recently, and the increases were significant enough to change project economics in some categories. The underlying driver is simple arithmetic. A mile of arterial road that cost a few million dollars a decade ago can now run substantially more, and if the fees do not track construction cost inflation, the district falls behind on the very projects the fees are meant to fund.

Beyond transportation, sewer and water connection fees are assessed by the relevant city or district, and those vary meaningfully depending on where a site sits and what capacity already exists in the lines serving it.

Traffic Studies and What They Trigger

Most commercial projects of any real size require a traffic impact study. The study models how many trips a proposed development will generate, when those trips occur, and how they interact with the existing road network at nearby intersections.

The study itself is a modest cost. What the study concludes can be a major one.

If the analysis shows that a project pushes an intersection below acceptable level of service standards, the developer may be required to fund improvements: a turn lane, a signal, a widened approach, or a realignment. Those requirements can add substantially to a project budget, and in some cases they determine whether the project pencils at all.

This is why experienced developers commission preliminary traffic analysis during due diligence rather than after closing on a site. A parcel that looks attractively priced can carry a hidden infrastructure obligation that only becomes visible once someone models the trip generation.

It is also why intended use matters so much to site selection. The same parcel might work comfortably for an office building and be economically impossible for a drive-through restaurant, purely because of the trip generation difference and what that difference triggers.

The Infrastructure You Build and Give Away

One of the least understood realities of commercial development is how much public infrastructure gets built by private developers and then dedicated to the public agency that will maintain it.

Roads, curb and gutter, sidewalks, streetlights, water mains, sewer lines, storm drainage. On a larger commercial project, a developer routinely builds several million dollars worth of this infrastructure to the jurisdiction’s exact standards, submits it for inspection, and then turns it over at no cost.

That work is separate from and in addition to impact fees. The fees fund the broader network improvements the project contributes to. The dedicated infrastructure is the specific connection between the project and that network.

This is genuinely invisible to most people evaluating whether development pays its own way in a growing community, and it represents a substantial share of what actually gets built in a fast-growing market. The collector road in front of a new retail center, the sidewalk connecting a neighborhood to a school, the water main that will eventually serve the parcel next door: much of it was built by a private developer and handed over.

Entitlement Costs and the Cost of Time

The direct fees are only part of the regulatory cost picture. The other part is time.

Every month a project spends in entitlements, design review, or permitting is a month of carrying costs on the land, a month of interest on any acquisition financing, and a month during which construction costs, interest rates, and market conditions can all move. On a project of meaningful size, carrying costs alone can run into serious money on a monthly basis.

That is why the difference between a jurisdiction with a predictable, well-staffed review process and one without it shows up directly in project economics. Two identical projects on two identical sites in two different cities can have materially different total costs purely because one moved through approvals in six months and the other took eighteen.

It is also why the entitlement track record of a development partner matters more than most people assume. Relationships with jurisdictional staff, familiarity with what each city actually wants to see in a submittal, and the ability to anticipate a comment before it becomes a formal condition of approval all compress timelines. That compression is real money.

What This Means for Business Owners Evaluating a Build

If you are a business considering building rather than leasing, the practical takeaway is that your project budget needs to account for a category of cost that is easy to overlook and difficult to estimate without local experience.

A useful early question for any site you are evaluating: what is the total cost of getting a building permit here, and what infrastructure obligations come attached to this parcel? A site that is cheaper per acre can easily end up more expensive per square foot of finished building once fees, required improvements, and utility extensions are accounted for.

The related question is timeline. Understanding realistically how long approvals will take in a specific jurisdiction for your specific use lets you plan your lease expiration, your capital deployment, and your operational transition around something closer to reality.

At Ahlquist, we have been navigating this process across every jurisdiction in the Treasure Valley for more than twenty years. Our full-service development and commercial construction teams underwrite the full cost picture on every project, including the parts that are easiest to miss. If you are evaluating a site or thinking through whether building makes sense for your business, we would welcome the conversation. You can also browse our available properties if leasing turns out to be the better fit.