What are development impact fees? A 2026 guide for builders

What development impact fees are

A development impact feeis a one-time charge a city or county imposes on new construction to help pay for the off-site public infrastructure that growth makes necessary. The logic is “growth pays for growth”: rather than burdening existing taxpayers with the cost of the roads, parks, and facilities a new subdivision will use, the jurisdiction recovers a proportionate share from the development that creates the demand.

The fee is collected once — typically at building-permit issuance — and is charged per dwelling unit for housing. It is distinct from property taxes (which are ongoing) and from the building permit fee (which only covers plan review and inspection). The amount depends on the land use: a single-family detached home, a townhome, a multifamily unit, and an ADU each generate different demand and pay different fees.

What they pay for

Impact fees fund the capital expansion of public facilities — not operations and not the development’s own on-site improvements. Common categories include:

• Transportation — arterial roads, intersections, signals, and sometimes transit and bike/pedestrian capacity.
• Parks & recreation — parkland acquisition, trails, and recreation facilities.
• Schools — classroom capacity, via a separate school facilities fee where the state authorizes one.
• Fire / EMS and police — stations, apparatus, and equipment serving the new area.
• Water & sewer — treatment, pumping, and storage capacity, recovered through connection fees (see below).
• Drainage, libraries, general government — stormwater facilities and other growth-related public capital, where adopted.

Each category must be backed by a study showing the fee is proportionate to the demand the development creates — and the revenue can generally only be spent on that category.

Impact fees vs. connection (tap/SDC) fees vs. building permit fees

Three different charges get lumped together as “the fees,” and confusing them throws off a pro forma. Here is the clean distinction:

• Development impact fees fund general public facilities — roads, parks, schools, fire, police. ImpactFeeAtlas tracks these.
• Water & sewer connection fees — the tap fee, capacity charge, system development charge (SDC), plant investment fee (PIF), or general facilities charge (GFC)— fund the utility’s treatment and conveyance capacity, and are often the single largest line item. ImpactFeeAtlas tracks these too.
• Building permit & plan-review fees only cover the cost of reviewing and inspecting your project for code compliance. They are much smaller and are a different, well-served category. ImpactFeeAtlas excludes these so the comparison stays focused on capital charges that move a pro forma.

How impact fees are calculated

Before a fee can be charged, the jurisdiction has to justify it with a nexus study (in Utah, an Impact Fee Facilities Plan plus an Impact Fee Analysis). The study measures the cost of the facilities growth will need, divides it across the new demand, and produces a per-unit fee. From there, how your specific fee is computed depends on the category:

• Most impact fees — a flat amount per dwelling unit that varies by land use.
• School fees (California) — charged per square foot of residential floor area under AB 602 and the Mitigation Fee Act, so a larger home pays more.
• Water & sewer — usually scaled to water meter size / ERU; we use the base residential meter for comparison.
• Annual escalation — many schedules rise each year by construction cost index escalation, so the same fee can climb without any vote.

How to estimate fees for your project

You have three ways to get a number on ImpactFeeAtlas, fastest first:

1. Open the jurisdiction’s page and use its built-in calculator — pick your land use and unit count for a sourced per-unit and project total.
2. Use /compare to run the same scenario across several cities side by side — useful when you’re still choosing where to build.
3. Scan the national and per-state rankings to see the high and low ends before you drill into a specific jurisdiction.

Across the 107 jurisdictions we track in 8 states, the median single-family total is about $23,752 and the top end exceeds $94,679 — treat any figure as a starting point and confirm the current adopted schedule with the jurisdiction before it goes into a loan package.

How impact fees differ by state

There is no national impact-fee law — each state writes its own enabling statute, and the differences are large. A few orientation notes for the states we cover:

• Arizona — meter-sized system development fees under A.R.S. §9-463.05; no school fees.
• California — highest fees in the nation under the Mitigation Fee Act, plus per-square-foot school fees.
• Colorado — home-rule cities where water/sewer plant investment fees dominate the total.
• Florida — county-level fees capped on how fast they can rise after HB 337.
• Idaho — city fees plus separate highway-district transportation fees; no school fees.
• Texas — only four fee categories allowed — water, wastewater, roadway, drainage.
• Utah — fees backed by an IFFP and an Impact Fee Analysis; no school fees.
• Washington — large school impact fees under the Growth Management Act, plus utility GFCs.

The terms behind these frameworks — the Growth Management Act, Texas Chapter 395, Arizona’s §9-463.05, and the Florida Impact Fee Act — are defined in the glossary.

Frequently asked questions

What is a development impact fee?

A development impact fee is a one-time charge a local government imposes on new construction to help pay for the off-site infrastructure that growth requires — roads, parks, schools, fire and police facilities, and similar public capital. It is not a tax on the building itself and is separate from the permit fee charged to review and inspect the project.

Are impact fees the same as connection or tap fees?

No, though they overlap in practice. Impact fees fund general public facilities (roads, parks, schools). Water and sewer connection fees — also called tap fees, capacity charges, system development charges, plant investment fees, or general facilities charges — fund the utility's treatment and conveyance capacity. ImpactFeeAtlas tracks both because together they make up the one-time fee burden on a new home.

How much are development impact fees for a new home?

It varies enormously by jurisdiction — from a few thousand dollars to well over $50,000 per single-family home once water and sewer connection fees are included. Among the jurisdictions we track, the median total is about $23,752 and the highest exceeds $94,679. Use a city's fee calculator or our compare tool for a specific figure.

Who pays the impact fee — the builder or the buyer?

The fee is collected from the permit applicant — usually the builder or developer — typically at building-permit issuance or certificate of occupancy. In practice the cost is generally passed through into the price of the finished home, so it influences both the pro forma and the final sale price.

When are impact fees paid?

Most jurisdictions collect impact and connection fees at building-permit issuance; some defer transportation or utility charges to final inspection or certificate of occupancy. The exact timing is set by local ordinance, so confirm it with the jurisdiction before building your draw schedule.

Do impact fees change every year?

Often, yes. Many schedules escalate automatically each year by a construction cost index, and jurisdictions also adopt new nexus studies periodically. A fee you quoted last year may be higher now even with no policy change, which is why every ImpactFeeAtlas figure carries a last-verified date.

Can impact fees be reduced or waived?

Sometimes. Many jurisdictions reduce or waive fees for accessory dwelling units, affordable or deed-restricted housing, infill, or redevelopment that reuses existing capacity. The rules are local and specific — check the ordinance and ask the jurisdiction about credits for existing use.