Impact Fees Explained: What New Building Pays For

New construction adds demand. More trips on the same streets, more calls to the same fire station, more children in the same schools, more flow into the same sewer. Impact fees are the mechanism by which a city asks new development to pay a proportionate share of the cost of serving that demand.

This article explains the CONCEPT and the legal constraints. It quotes no amounts, because fee schedules are adopted locally, updated periodically, and are meaningless secondhand. Every figure you need comes from the current adopted schedule at the counter.

The nexus requirement

California law does not let a city charge whatever it likes. The framework that governs development fees requires a demonstrated relationship, usually called a NEXUS, between the fee and the impact.

In practice a city must identify the purpose of the fee, identify the use of the money, show a reasonable relationship between the fee's use and the type of development it is charged on, show a relationship between the need for the facility and the development, and show a relationship between the amount and the cost attributable to that development.

That is why fee adoption is accompanied by a nexus study. The study is a public document and it is the honest answer to "why is the fee what it is."

What kinds of fees exist

Categories vary by city, but the recurring ones include transportation and circulation, parks and recreation, public safety facilities, drainage and stormwater, sewer and water connection, general facilities, and school fees, which are levied by the school district rather than the city under its own statutory framework.

Separately from fees there are EXACTIONS: the physical obligations attached as conditions, such as building a frontage improvement, dedicating right of way, or installing a drainage facility. These serve a similar purpose through a different mechanism, and they show up on the condition list rather than the fee schedule. Our piece on conditions of approval covers how those obligations are written and enforced.

When fees are calculated and when they are paid

These are different moments and confusing them wrecks a budget. A project's fee exposure is usually estimated during entitlement, then calculated definitively at permit issuance under the schedule in effect at that time, and often paid at issuance or at occupancy depending on the fee and local practice.

The consequence: a long approval process can span a fee update. A pro forma built on last year's schedule is a guess. Anyone planning a project should ask the counter which schedule applies and at what trigger it locks.

The sequencing between approval and permit is explained in our piece on entitlements versus building permits.

Why fees shape what gets built

Fees are a fixed cost per unit or per square foot, largely independent of the sale price. That has predictable effects.

Fixed costs fall hardest on small and inexpensive projects. A per-unit fee is a small fraction of a large home's cost and a large fraction of a modest one's. Fee structures therefore influence not only how much gets built but WHAT gets built, which is why fee reform is a recurring topic wherever housing cost is a concern.

Certain categories of housing receive statutory fee reductions, waivers, or deferrals under state law. Those provisions change, they are technical, and they are exactly the kind of thing to verify with the city rather than to assume. The broader tension between state mandates and local practice is covered in state housing laws versus local control.

What a homeowner should take from this

Three practical points.

If you are adding to your home, ask early whether your project triggers impact fees and which ones. Additions above a size threshold, new accessory units, and new plumbing fixtures can each trigger different categories. Finding out at permit issuance is the expensive way.

If you are evaluating a lot for its build potential, the fee schedule is part of the price. A cheap lot with heavy frontage obligations and full fee exposure is not cheap.

If you are following a project near you, the fee and exaction package is the part of the staff report that describes what the public gets. Reading it is more informative than reading the design debate. Our guide to reading a development proposal shows where in the report to look.

Fees are not a veto

A common misreading is that fees exist to discourage building. They exist to fund the facilities that serve it, and the nexus rules constrain them precisely so they cannot function as a general tax on development. A fee that cannot be justified by a study is vulnerable to challenge.

That is the balance the framework strikes: cities may require new development to pay its proportional share, and no more, with the arithmetic shown in public.

Where to verify

Ask for the current adopted fee schedule, the resolution adopting it, and the most recent nexus study. Ask which fees apply to your specific project type, when they are calculated, and when they are due. Ask about any deferral programs.

Then treat any number you read anywhere else, including here, as background rather than as budget. Schedules change and only the adopted one governs.

Start at the City Development hub for the surrounding process, and read how land is legally divided if your project involves creating a new lot, since map conditions and fee exposure arrive together.

Anthony Grynchal has been licensed in California since November 2009.