Will an addition or ADU in La Verne owe impact fees?

If you’re planning an addition or ADU in La Verne, the new impact fee chapter doesn’t itself raise your fees. The September 21, 2026 ordinance put the rules together in Chapter 3.18 without changing approved amounts. New dwelling units and additions over the stated size thresholds trigger fees; ADUs under 750 square feet are exempt. Residential fees generally come due at final inspection or a certificate of occupancy, whichever is earlier.

As of October 21, 2026: the La Verne City Council introduced the ordinance on September 8, 2026 and adopted it on September 21, 2026, creating Chapter 3.18, Development Impact Fees, in the La Verne Municipal Code.

This explains the rule and is not tax or legal advice.

What did the new chapter change?

Chapter 3.18 gathered fee provisions into one place without changing previously approved fee amounts, nexus findings, or substantive requirements.

The rules had been scattered through the Municipal Code. The ordinance repealed the chapters covering Parks and Recreation Charges, Fire Equipment Fee, and Fire Development Fees for the Hillside Development Overlay Zone. It also repealed sections 12.23.050, 12.23.060 and 12.23.070.

The new chapter lists nine categories: public facilities, police facilities, fire facilities, parks and recreation, storm drain facilities, undergrounding utilities, affordable housing in-lieu, affordable housing linkage, and transportation/traffic.

That list isn’t a bill for your project. Ask which categories apply. The September 21 agenda packet contains the staff report and ordinance.

Which additions trigger fees?

An addition triggers the chapter’s residential size rule when it is greater than 500 square feet or greater than one quarter of the existing living area.

Either threshold matters. An addition of 500 square feet or less falls outside these size triggers only if it is also no more than one quarter of the existing living area. Looking only at the 500-square-foot figure could leave you with the wrong expectation.

Section 3.18.030(B) also includes new residential dwelling units and the addition of new units, with ADUs addressed separately.

Before designing the project, ask the La Verne Community Development (Planning) Department to confirm the existing living area, proposed addition size, applicable fee categories, and current schedule. Get the fee question tied to your actual plans.

Say an owner plans a 500-square-foot addition in La Verne and expects it to fall outside the size triggers. Before settling the plans, the owner asks Planning to compare the addition with the home’s existing living area. If the addition is greater than one quarter of that area, it still triggers the chapter’s residential size rule. The owner would then ask which fee categories apply and request the current schedule before budgeting for the work.

What work is exempt?

The chapter exempts qualifying reconstruction, replacement, or repair of a lawfully established structure when there is no net increase in floor area, dwelling units, or intensity of use.

It also exempts structures that create no additional demand for public facilities, provided they don’t increase residential units, occupancy, or intensity of use. These exemptions apply unless otherwise required by law.

The distinction matters if you’re calling a project a repair while also enlarging it. Ask Planning how the proposed scope fits the exemption rather than relying on the project’s label.

ADUs have their own provisions, including a size threshold that needs particular care.

How do the ADU rules work?

ADUs under 750 square feet are exempt from impact fees, while larger ADUs can be charged proportionately in relation to the primary dwelling’s square footage.

An ADU planned at exactly 750 square feet needs a direct answer from the city. Chapter 3.18 exempts ADUs of 750 square feet or less. Section 18.120.050(K), adopted with the April ADU updates, exempts those less than 750 square feet and provides for proportional fees at 750 square feet or greater. The wording differs. Ask how the city applies it before settling the design.

There is also a provision for previously unpermitted units. Section 18.120.050(K)(4) bars impact fees for a homeowner seeking a permit for an unpermitted junior or accessory dwelling unit built before January 1, 2020, with a utility infrastructure exception tied to Health and Safety Code section 17920.3 and Government Code section 66324(e).

If that describes your property, ask about that provision specifically. The broader ADU rules guide and unpermitted work disclosure guide can help frame the separate planning and sale questions.

When are fees due, and can amounts change?

Residential development impact fees generally are due at final inspection or issuance of a certificate of occupancy, whichever is earlier, and the fee schedule adjusts annually on July 1.

There are exceptions to the payment timing. Fees that reimburse the city for expenditures already made are due at building permit issuance. Utility service connection fees are due when you apply for the connection.

Budget for the final stage of construction as well as the permit stage. Ask which schedule will determine your bill if the project crosses July 1.

The annual adjustment uses the California Construction Cost Index or another index the Council approves. Dollar amounts are set by resolution following approval of a nexus study, with calculations based on land use and the latest per-unit or per-square-foot schedule. The chapter allows the Council to adopt a deferral program by resolution; it doesn’t establish that such a program exists.

Does the affordable housing in-lieu fee apply?

The city documents reviewed do not say whether the affordable housing in-lieu fee applies to an addition, an ADU, or a single home built by its owner, so ask the city whether it applies to your project.

On April 20, 2026, the Council set in-lieu rates per square foot of new construction at $20.00 for single family detached homes, townhomes, and condominiums, and $45.00 for apartments.

Those rates aren’t enough to calculate your project’s bill. First confirm applicability, then ask for the current amount. The April 20 agenda packet contains the resolution and the ADU provisions.

How can you question a fee?

You can provide substantial evidence that the required nexus doesn’t exist or that a fee imposed as a condition of approval should be adjusted.

Start by asking for the applicable category, current schedule, and calculation for your project. That gives you something concrete to review.

Section 3.18.110 directs protests, appeals, and audits to Mitigation Fee Act procedures commencing with Government Code section 66020. Check the city’s Agenda Center for future fee resolutions when reviewing the schedule.

What should a buyer or seller check?

A buyer reviewing a recently permitted addition or ADU should ask for the final inspection record and fee receipts.

Compare those records with the work being presented for sale. A seller can gather the same documents before listing so the fee question has a documented answer.

Keep the paperwork alongside the materials covered in the seller disclosure guide. If you’re considering a pre-listing inspection, include the permit and fee records in your preparation.

The short version

La Verne reorganized its impact fee rules without changing approved amounts, but your project’s size and type still determine whether fees apply.

Confirm addition thresholds, ask about an ADU at exactly 750 square feet, and request the current calculation before budgeting. For a recent project you’re buying or selling, collect the final inspection record and fee receipts.

For a starting point on what a home is worth before or after a project, use the home value tool.