Development impact fees are charges that California local agencies impose on new development to fund public infrastructure. A developer submitting a building permit application may encounter fees for roads, parks, schools, water and sewer connections, and fire stations. These fees can add significant cost per unit to a project.
California law allows local agencies to impose impact fees. It also places constitutional and statutory limits on how fees are calculated, imposed, and spent. The Mitigation Fee Act and federal constitutional doctrine both constrain what agencies can require. When fees exceed those limits, developers may have grounds to challenge them.
What Development Impact Fees Are
An impact fee is a monetary charge a local agency requires a developer to pay as a condition of receiving a development approval or building permit. The fee is intended to offset the cost of public infrastructure that new development generates demand for.
Impact fees are distinct from dedications. A dedication requires a developer to transfer land or an easement to the public. A fee requires a cash payment. Both are subject to constitutional limits, but the specific legal standards differ.
Common California impact fee categories include transportation fees, park fees, and school facilities fees. Water and sewer connection fees, fire facility fees, and affordable housing in-lieu fees are also common.
The Mitigation Fee Act
The primary statute governing development impact fees in California is the Mitigation Fee Act, codified at Government Code section 66000 et seq. The Act sets procedural requirements for adopting and imposing fees, establishes substantive standards, creates accounting obligations, and provides remedies for unlawful fees.
The Two-Part Nexus Test
Under Government Code section 66001, a local agency imposing an impact fee must make two findings. First, the fee must have a reasonable relationship to the burden the development places on public facilities. Second, there must be a reasonable relationship between the fee amount and the cost of the facility attributable to the development. The California Department of Housing and Community Development (HCD) publishes guidance on impact fee practices and housing production.
A fee adopted without findings supported by substantial evidence may face a successful challenge under the Act.
Notice and Hearing Requirements
Before adopting or increasing an impact fee, a local agency must hold a public hearing. Required disclosures are set out in Government Code section 66016 These include 14 days’ advance notice and making the underlying fee data available for public review. A fee adopted without these procedural requirements may be challenged on that basis.
Accounting and Reporting
The Mitigation Fee Act requires local agencies to maintain separate accounts for each fee program and report annually on collections and expenditures. Under Government Code section 66006, if collected fees have not been expended or committed within five years, the agency must make specific findings to justify retaining them. Uncommitted fees may be subject to refund claims.
Refund Rights and the Protest Procedure
Under Government Code section 66020, a developer who believes a fee was unlawfully imposed must provide written notice of protest at or before the time of payment. The protest must specify the fee and the basis for challenging it. Failure to protest at payment generally bars a later refund claim. After payment under protest, the developer has 180 days to file suit.
Constitutional Limits on Impact Fees
The Nollan/Dolan Framework
In Nollan v. California Coastal Commission, 483 U.S. 825 (1987), the U.S. Supreme Court held that a permit condition must have an essential nexus to the legitimate government interest that justifies it. In Dolan v. City of Tigard, 512 U.S. 374 (1994), the Court added a rough proportionality requirement. The condition must be roughly proportional in nature and extent to the project’s actual impacts.
A fee or dedication that lacks an essential nexus, or that is grossly disproportionate to the project’s impacts, may be unconstitutional under the Takings Clause of the Fifth Amendment.
Sheetz v. County of El Dorado
In Sheetz v. County of El Dorado, 601 U.S. 267 (2024), the U.S. Supreme Court held that the Nollan/Dolan nexus and proportionality requirements apply to legislatively prescribed impact fees. Before Sheetz, some California courts held that Nollan/Dolan did not apply to fees set by ordinance or fee schedule. Sheetz removed that protection. A development fee set by ordinance is now subject to the same constitutional standards as a condition imposed in an individual permit decision.
Sheetz has significant implications for California impact fee programs. Local fee schedules previously insulated from constitutional challenge may now face Nollan/Dolan scrutiny. The full scope of Sheetz’s effect is still being worked out in the courts.
California Constitutional Protections
Article I, Section 19 of the California Constitution prohibits taking or damaging private property without just compensation. California courts have recognized that exactions lacking the required nexus and proportionality can give rise to inverse condemnation claims. The firm’s inverse condemnation practice is at Inverse Condemnation Law.
School Facilities Fees
School facilities fees in California are governed by Education Code section 17620, which creates a separate framework from the Mitigation Fee Act with different nexus requirements, fee levels, and procedures. These fees are imposed by school districts on new residential and commercial construction, while the California Department of Education provides information on Level 1, Level 2, and Level 3 school fee programs. They are assessed separately from general impact fees charged by cities and counties and do not replace those obligations.
Water and Sewer Connection Fees
Connection fees charged by water and sewer utilities are governed by the Mitigation Fee Act and by additional provisions under Government Code section 66013 Connection fees must be designed to fund the cost of system capacity that benefits the development. They may not include charges for general government services unrelated to water or sewer infrastructure. Fees exceeding the cost of attributable capacity may be subject to challenge.
Fee Reductions and Waivers for Affordable Housing
Under the Density Bonus Law (Gov. Code § 65915), a developer may request incentives or concessions from a local agency as part of a density bonus project. Fee reductions that result in identifiable, financially significant cost savings may qualify as a concession the agency is required to grant, absent specific findings of adverse public health or safety impact.
Local agencies may also have adopted fee waiver programs for affordable housing projects, low-income residential development, or accessory dwelling units. ADU permit fees are subject to specific statutory limitations. Local agencies may not charge certain fees for ADUs attached to existing structures or below a specified size threshold.
Challenging Development Impact Fees
Administrative Protest
The primary mechanism for challenging an impact fee under California law is the protest procedure in Government Code section 66020 Written protest at the time of payment is required to preserve the right to a refund. After paying under protest, the developer has 180 days to file suit. Missing this deadline generally forecloses the challenge regardless of its merits.
Constitutional Challenge Under Sheetz and Nollan/Dolan
Following Sheetz, a developer may challenge an impact fee set by ordinance on the grounds that it lacks an essential nexus to the project’s impacts, or is not roughly proportional to those impacts. These challenges require evidence comparing the fee amount to the project’s actual impact on public facilities. The strength of the challenge depends on the quality of the agency’s nexus study and the specific characteristics of the project.
Writ of Mandate
A developer who has exhausted administrative remedies may file a petition for writ of mandate in California Superior Court to compel a refund of an unlawfully collected fee. An overview of writ proceedings in the land use context is at Writ of Administrative Mandate in California Land Use Law.
Inverse Condemnation
Where an impact fee is so disproportionate to a project’s actual impacts that it functions as a forced subsidy, a Takings Clause argument may arise. California’s inverse condemnation doctrine, which covers property damaged as well as taken, may provide an additional basis for recovery. A discussion of when permit conditions give rise to inverse condemnation is at When Permit Delays Become Inverse Condemnation in California.
Impact Fees and Development Economics
Development impact fees add to the cost of housing production. High fees reduce housing production and increase project costs, which often translate into higher rents or sale prices.
Recent California housing legislation has imposed limits on fees for ADUs, restricted the use of CEQA fees to supplement impact fee programs, and expanded the density bonus concession framework to allow fee reductions for affordable housing production.
Where fee disputes arise alongside a broader permit denial or zoning challenge, they often need to be evaluated together. Zoning conflicts and their interaction with state law are addressed at Resolving Zoning Conflicts in California: What SB 786 Means for Developers. The interaction between fees, permit conditions, and the variance process is at Zoning Variances and Use Permits in California: How to Get Approval.
Kassouni Law’s Practice in Development Fee Disputes
Kassouni Law represents private property owners and developers in permit and fee disputes, land use challenges, inverse condemnation claims, and Constitutional property rights matters throughout California. The firm has never represented a government agency. The development law practice is at Development Law. The full land use practice is at Land Use Law.
Managing attorney Timothy V. Kassouni has over three decades of experience in California land use and Constitutional property rights law. His profile is at Timothy V. Kassouni.
Speak to a California Land Use Attorney About Impact Fee Disputes
Kassouni Law represents developers and property owners in California facing development impact fee disputes, permit challenges, inverse condemnation claims, and complex land use matters. If you believe an impact fee is excessive, improperly imposed, or interfering with your project, contact Kassouni Law at 877-770-7379 or visit kassounilaw.com/contact to discuss your legal options.
Frequently Asked Questions
1. What legal limits apply to California development impact fees?
California development impact fees are subject to both statutory and constitutional limits. Under the Mitigation Fee Act (Gov. Code § 66000 et seq.), fees must have a reasonable relationship to the burden the development places on public facilities and to the cost of the facility attributable to the project. Constitutionally, the nexus and proportionality requirements of Nollan/Dolan apply to all development fees, including those set by ordinance, following the U.S. Supreme Court’s 2024 decision in Sheetz v. County of El Dorado. A fee that fails either test may be challenged.
2. What did Sheetz v. County of El Dorado change for California developers?
In Sheetz v. County of El Dorado, 601 U.S. 267 (2024), the U.S. Supreme Court held that the Nollan/Dolan constitutional standards apply to fees established by legislation or ordinance. Before Sheetz, California courts had sometimes held those standards did not apply to legislatively prescribed fees. Sheetz removed that protection. Local agencies with fee programs that have not been designed to comply with Nollan/Dolan may now face constitutional challenges that were not previously available. The courts are still working through the full implications of the decision.
3. How does a developer challenge a California impact fee?
Under Government Code section 66020, a developer must provide written notice of protest at or before the time of payment. The protest must specify the fee and the basis for the challenge. After paying under protest, the developer has 180 days to file suit. Missing either deadline generally bars the challenge. A developer may also bring a constitutional challenge under the Nollan/Dolan/Sheetz framework, which requires evidence that the fee lacks the required nexus or proportionality to the project’s actual impacts. Permit approval remedies that may be available in related contexts are discussed at How AB 253 and AB 301 Force Permit Approvals.
4. Can an impact fee constitute an unconstitutional taking?
Yes, in some circumstances. A fee that lacks an essential nexus to the project’s impacts, or that is grossly disproportionate to those impacts, may constitute an unconstitutional condition under the Takings Clause. Following Sheetz, this applies to fees set by ordinance as well as to individualized permit conditions. Whether a specific fee crosses the constitutional line depends on the fee’s design, the project’s actual impacts, and the adequacy of the agency’s nexus analysis. These are fact-specific determinations courts make on a case-by-case basis.
5. Are school fees different from other California development impact fees?
Yes. School facilities fees are governed by Education Code section 17620, which establishes a separate framework with different nexus requirements, fee levels, and procedures. School districts levy these fees on new residential and commercial construction at specified maximum levels per square foot. The California Department of Education administers the school fee program. General impact fees imposed by cities and counties are governed by the Mitigation Fee Act. School fees are assessed in addition to those charges, not as a substitute.
