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Impact Fees

This page provides links to materials addressing technical and legal aspects of impact fees, sample ordinances, and fee schedules.

Statutory Provisions

Impact fees are charges assessed by local governments against new development projects that attempt to recover the cost incurred by government in providing the public facilities required to serve the new development. Impact fees are only used to fund facilities that are directly associated with the new development. They may be used to pay the proportionate share of the cost of public facilities that benefit the new development; however, impact fees cannot be used to correct existing deficiencies in public facilities. In Washington, impact fees are authorized for those jurisdictions planning under the Growth Management Act (RCW 82.02.050 - .110), as part of “voluntary agreements” under RCW 82.02.020, and as mitigation for impacts under the State Environmental Policy Act (SEPA - Ch. 43.21C RCW). The Washington Administrative Code outlines impact fees in WAC 365-196-850.

GMA impact fees are only authorized for: public streets and roads; publicly owned parks, open space, and recreation facilities; school facilities; and fire protection facilities. Setting fee schedules for impact fees is a complex process typically involving rate studies; generally, impact fees do not recover the full cost of a new facility since these fees must be directly and proportionately related to impacts associated with new development. The MRSC webpage: Types of Impact Fees and Other Sources of Public Funding Authorized by Washington Statutes, provides more information about these alternative types of impact fees.

In 2011, the Legislature adopted ESHB 1478 (Chapter 353, Laws of 2011), which extends the time period for expenditure of all types of GMA impact fees to 10 years. Impact fees may be held for longer than 10 years if the governing body of a local government identifies in written findings "extraordinary and compelling reasons" that justify the longer period.

In 2015, the Legislature enacted changes to how impact fees are to be collected by Washington counties, cities, and towns. ESB 5923 requires counties, cities, and towns to adopt a deferral system for the collection of impact fees for new single-family detached and attached residential construction.

Court Decisions


  • James v. Kitsap County, 154 Wn.2d 574 (2005)

    The imposition of impact fees as a condition of building permit issuance is a "land use decision" subject to the Land Use Petition Act (LUPA), and thus must be challenged within 21 days.

  • Pavlina v. City of Vancouver, 122 Wn. App. 520 (2004) - Assessment of development impact fees

    Even though preliminary plat approval occurred before an impact fee ordinance was adopted, the fees could be imposed when the developer applied for a building permit. Impact fees are not an additional condition of approval. That the developer’s plan previously received preliminary approval does not preclude imposition of impact fees when a building permit is sought.

  • Nolte v. City of Olympia, 96 Wn. App. 944 (1999)

    A city may not impose impact fees on projects outside of its borders. However, if a city enters into a utility extension agreement (UEA) based on the promise to pay impact fees that are later found to be invalid, the city is relieved of its duty to perform under the UEA.

  • Vintage Construction Co. v. Bothell, 83 Wn. App. 605 (1996)

    A land developer sought to recover fees paid to a city in lieu of dedication of land that were imposed on the developer as a condition of subdivision approval. The court held that the city's failure to determine, in a site-specific manner, the value of the land the developer could have been required to dedicate rendered the fees in lieu of dedication invalid. This case provides a clarification of two earlier cases concerning impact fees: Henderson Homes v. Bothell, 124 Wn.2d 240 (1994), and Trimen Development Co. v. King County, 124 Wn.2d 261 (1994)


  • Wellington River Hollow v. King County, 113 Wn. App. 574 (2002) - Impact Fees

    It is not unconstitutional for jurisdictions within a school district have discretion to impose school impact fees on new developments, even though the amount of fees for comparable units will differ from one jurisdiction to another within the same school district.

  • West Coast, Inc. v. Snohomish County, 104 Wn. App. 735 (2000) - Preliminary Plats/Modification/Impact Fees

    A condition of preliminary plat approval, in this case school impact fees, is tantamount to a contractual obligation that is binding on the applicant absent extraordinary circumstances justifying a failure to perform.


  • City of Olympia v. Drebick, 156 Wn.2d 289 (2006) - Calculation of development fees under GMA

    The state supreme court upheld the city's calculation of transportation impact fees imposed under GMA, reversing a decision by the court of appeals (119 Wn. App. 774 (2004)). The GMA impact fee statutes permit local governments to base impact fees on area-wide infrastructure improvements reasonably related and beneficial to the particular development seeking approval. This standard is broader than the standard under SEPA or the Local Transportation Act. The city was not required to calculate the impact fee by making individualized assessments of the Drebick development's direct impact on each improvement planned in a service area. The city's method of calculating transportation impact fees complied with the plain language of the GMA impact fee statutes.

  • New Castle Invs. v. City of LaCenter, 98 Wn. App.224 (1999) - Transportation Impact Fee Ordinance

    A city's transportation impact fee ordinance is not subject to the vesting statute for subdivision applications, RCW 58.17.033, because transportation impact fees do not fall within the definition of "land use control ordinances" under that statute. Consequently, the city's impact fee can be applied to a proposed development even though the application for preliminary plat approval was completed prior to the effective date for the city's ordinance.

Growth Management Hearings Board Decisions

Most Growth Management Hearings Board decisions address the fact that impact fees imposed under Chapter 82.02 RCW are not within the board’s jurisdiction. As per the James v. Kitsap County Supreme Court case cited above, impact fee matters are land use decisions in the development permit arena and are subject to the Land Use Petition Act (LUPA). There are a few hearings board cases that tangentially touch on the impact fee issue, primarily in the central Puget Sound area.

To find growth management hearings board cases that address this and related issues, the boards have a Case and Decision Search page with a keyword search capacity that may be of help. The board also posts digests that summarize key holdings of cases and that have a keyword index of major topics including “impact fees.” Note that the boards have now been consolidated into a single board and, as of July 1, 2010, all hearings board cases are in the same digest, rather than separate digests by region.


Here are some examples of impact fee codes selected by MRSC planners. 

County Ordinances Authorizing Impact Fees for Multiple Capital Facilities

  • Clark County Code
    • Ch. 40.610 - Development Impact Fees - General Provisions
    • Ch. 40.620 - Calculation of Development Impact Fees - Traffic, parks, and schools
    • Ch. 40.630 - Procedures
  • Kitsap County Code Ch. 4.110 - Impact Fees (see especially Sec. 14.110.200) - Schools, roads,and parks
  • Pierce County Title 4A - Impact Fees - Parks, schools, and traffic

City Ordinances Authorizing Impact Fees for Multiple Capital Facilities

  • Enumclaw Municipal Code Ch. 19.24 - Impact Fees - Transportation, parks, fire, and schools
  • Gig Harbor Municipal Code Ch. 19.12 - Impact Fees - Roads, parks and schools
  • Olympia Municipal Code Title 15 - Impact Fees - Parks, schools, and transportation
  • Redmond Municipal Code Ch. 3.10 - Impact Fees - Highlighted in a State Auditor's Office report for leading practices in fire and transportation impact fee program
  • Stanwood Municipal Code Ch. 17.151 - Impact Fees - Public Facilities - Transportation, parks, and fire
  • Tumwater Municipal Code Ch. 3.50 - Impact Fees - Fire, transportation, and schools

School Impact Fee Ordinances

  • Gig Harbor Municipal Code Ch. 19.12 - Impact Fees
  • Issaquah Municipal Code Ch. 3.63 - School Impact Fees
  • King County Code Ch. 21A.43 and Attachment A (Ordinance no.11621) indicating formula for calculating school impact fees
  • Mukilteo Municipal Code Ch. 3.100 - School Impact Fees
  • Snohomish County Code Ch. 30.66C - School Impact Mitigation
  • Vancouver Municipal Code Sec. 20.915.060 – School Impact Fees - Highlighted in a State Auditor's Office report for leading practices in impact fee program

Transportation Impact Fee Ordinances

  • Bellevue Municipal Code Ch. 22.16 - Transportation Improvement Program
  • Bellingham Municipal Code Ch. 19.06 - Transportation Impact Fees - See especially Sec. 19.06.040(E)
    • Transportation Impact Fees Urban Village TIF Reduction Program - Unique, multi-award-winning program reduces vehicle trip generation attributed to site and associated impact fees depending on land use mix, pedestrian and bicycle facilities, and proximity to high-frequency transit
  • Issaquah Municipal Code Ch. 3.71 - Transportation Impact Fees
  • King County Code Title 14, Ch. 14.75 - Mitigation Payment System
  • Kirkland Municipal Code Ch. 27.04 - Transportation Impact Fees
  • Snohomish County Code Ch. 30.66B - Concurrency and Road Impact Mitigation - See Sec. 30.66B.310 - .370
  • Spokane Municipal Code Ch. 17D.075 - Transportation Impact Fees

Park and Recreation Impact Fee Ordinances

  • Bothell Municipal Code Ch. 21.08 - Park Impact Fees
  • Mukilteo Municipal Code Ch. 3.105 - Park Impact Mitigation
  • Sequim Municipal Code Title 22, Division II. Parks and Recreation Impact Fees
  • Tumwater Municipal Code Ch. 3.52 - Park Impact Fee Ordinance

Fire Impact Fee Ordinances

  • Auburn Municipal Code Ch. 19.06 - Fire Impact Fees
  • Dupont Municipal Code Ch. 26.05 - Fire Impact Fees
  • Issaquah Municipal Code Ch. 3.73 - Fire Protection Impact Fees
  • Redmond (See under Multiple Capital Facilities above)


Types of Impact Fees and Other Sources of Public Facility Funding Authorized by Washington Statutes

The legislature has adopted a number of statutes that provide alternatives for the financing of public facilities to serve existing and/or new development. For a brief overview of statutes authorizing several different types of impact fees, and of selected sources of public facility financing other than impact fees, see the MRSC webpage Types of Impact Fees and Other Sources of Public Facility Funding Authorized by Washington Statutes.

Impact Fee Payment Deferral Programs

The passage of ESB 5923 during the 2015 legislative session requires all local jurisdictions to adopt an impact fee deferral system by September 1, 2016 for new single-family detached and attached residential construction. For more information on this topic, see the MRSC webpage Impact Fee Payment Deferral Programs.

Impact Fee Studies and Surveys


Rate Studies

Examples of communities that have prepared rate studies to justify fees.

Additional References

  • MRSC Inquiries - Impact Fees - See MRSC responses to frequently asked questions about Impact Fees
  •, an online impact fees resource provided by Duncan Associates - Comprehensive site on impact fees developed by national impact fee consultants; includes news, state and local links, surveys, publications, and case law

Last Modified: May 12, 2016