King County is considering updated school impact fees for qualifying new residential development in unincorporated areas beginning in 2027. These fees are intended to help participating school districts fund facilities needed to serve enrollment growth associated with new housing.
The proposal does not mean every new home in King County will pay the same fee. The amount may vary by school district, housing type, and bedroom count. The King County schedule also applies to qualifying development in unincorporated King County, not automatically to every property located inside a participating school district.
For buyers, the practical question is not only how much the fee is. It is whether the property is under King County permitting jurisdiction, whether the fee has already been paid or deferred, and whether the cost is reflected in the builder’s pricing or purchase contract.
As of July 2026, the ordinance remains proposed. King County accepted initial public comments through July 20, 2026 and estimated transmitting the finalized draft to the King County Council in September 2026 for review, possible changes, and potential adoption.
Key takeaways
- School impact fees help fund eligible school facilities needed because of growth from new residential development.
- King County’s proposed schedule would apply to qualifying homes permitted in unincorporated King County.
- Being located within a participating school district does not automatically mean the county fee applies.
- The proposal includes districts serving parts of South King County, including Tahoma, Auburn, Enumclaw, Renton, Federal Way, Highline, and Fife.
- Proposed fees vary by district, housing type, and in some cases bedroom count.
- Accessory dwelling units and several other housing categories may qualify for exemptions under the draft.
- The permit applicant or developer normally handles the fee, but the economic cost may be reflected in the project’s pricing.
- Washington law allows certain residential impact fees to be deferred until final inspection, certificate of occupancy, or the first sale.
- A fee increase does not guarantee an equal dollar-for-dollar increase in a home’s final price.
- All amounts and effective dates should be verified after the King County Council completes its review.
What is a school impact fee?
A school impact fee is a charge on new residential development that helps fund school facilities needed to accommodate enrollment growth connected with that development.
Washington law allows counties and cities to require new development to pay a proportionate share of eligible public-facility costs. The fee must be reasonably related to the development, cannot exceed its proportionate share, and must support improvements that will reasonably benefit the development. Impact fees also cannot be the only funding source for those facilities.
School impact fees may help fund eligible capital projects such as:
- New school buildings
- Classroom additions
- Facility expansions
- Portable classrooms
- Site acquisition
- Improvements needed to increase student capacity
The fees are generally not intended to pay routine operating expenses, teacher salaries, or every school-system expense.
Is a school impact fee the same as a property tax or school levy?
No. A school impact fee is tied to qualifying new development. Property taxes and voter-approved school levies are broader funding mechanisms paid by property owners under separate rules.
A homeowner purchasing an existing resale property would not normally receive a new school impact fee simply because ownership changes. The fee is associated with development activity and the permitting process.
What is King County proposing for 2027?
King County’s draft ordinance would adopt updated capital facilities plans and establish 2027 school impact fees for 12 participating school districts.
The districts listed in the proposal are:
- Tahoma School District
- Federal Way Public Schools
- Riverview School District
- Issaquah School District
- Snoqualmie Valley School District
- Highline School District
- Lake Washington School District
- Northshore School District
- Enumclaw School District
- Fife School District
- Auburn School District
- Renton School District
King County’s Local Services page identifies the ordinance, each district’s capital facilities plan, and a plain-language summary as documents available for public review. The county says the finalized proposal is expected to move to the County Council in September 2026, where another public-review opportunity is expected.
The proposal should not be described as adopted law until the County Council completes its process.
Where would the King County school impact fees apply?
The county schedule would apply to qualifying new residential units permitted in unincorporated King County.
Unincorporated King County includes land outside the boundaries of incorporated cities. These areas are governed and permitted directly by King County rather than by a city government.
This distinction is important because:
- A Maple Valley mailing address does not always mean the property is inside Maple Valley city limits.
- A Renton mailing address does not always mean the property is within the City of Renton.
- A home can be located within a school district but outside the city commonly associated with that district.
- Cities may maintain separate impact-fee ordinances and schedules.
Does the county schedule apply inside Maple Valley, Renton, or Auburn?
Not automatically.
A property inside an incorporated city is generally subject to that city’s development and permitting rules. A nearby property in unincorporated King County may be subject to the county’s proposed schedule even when both properties share a school district or mailing address.
Before relying on any proposed fee amount, buyers and builders should verify:
- The legal jurisdiction
- The school district
- The permit-issuing agency
- The housing type
- The number of bedrooms
- The fee schedule in effect when the relevant permit or deferral is processed
Which South King County school districts are included?
Several districts in the proposal serve South King County communities or adjacent unincorporated areas.
Tahoma School District
Tahoma School District serves Maple Valley and surrounding areas. The proposed King County schedule is especially relevant to new development in unincorporated portions of the district.
A new home inside Maple Valley city limits may be subject to city rules rather than the county schedule. A home with a Maple Valley mailing address outside city limits may fall under King County permitting.
Auburn School District
The proposal includes Auburn School District’s capital facilities plan and a proposed fee schedule for qualifying development in unincorporated King County within the district.
This distinction matters for buyers comparing projects within Auburn city limits with developments in nearby county jurisdiction.
Enumclaw School District
Enumclaw School District covers a large geographic area that includes the city and surrounding rural or unincorporated land.
Because the draft includes different amounts by housing type and bedroom count, buyers should verify the specific project rather than relying on a districtwide generalization.
Renton School District
The proposal includes Renton School District’s capital facilities plan. The draft reviewed during the research phase showed proposed county fee amounts of zero for some Renton housing categories.
A proposed zero fee does not mean there are no school-capacity needs or development expenses. It only reflects the result of the current impact-fee calculation under the submitted plan.
Federal Way and Highline school districts
Federal Way and Highline are also included. The county schedule would be relevant only to qualifying development within unincorporated King County portions of those districts.
Fife School District
Fife School District is primarily associated with Pierce County but includes a limited area within King County. Buyers should verify both the property’s jurisdiction and district assignment.
What are the proposed South King County fee amounts?
The draft reviewed during the pre-publication research contained the following proposed amounts for selected single-detached homes.
Selected draft 2027 school impact fees
School district | Three or more bedrooms | Two or fewer bedrooms |
|---|---|---|
Tahoma | $3,182 | $0 |
Auburn | $8,003 | $0 |
Enumclaw | $16,559 | $2,693 |
Renton | $0 | $0 |
Federal Way | $0 | $0 |
Highline | $0 | $0 |
These figures are draft amounts, not final adopted fees. They should be checked against the ordinance ultimately approved by the King County Council.
The table also should not be used to assume that every home within a district will owe the listed amount. Applicability depends on jurisdiction, permit timing, housing type, bedroom count, exemptions, credits, and the final adopted schedule.
Why do school impact fees vary by district?
Each school district prepares a capital facilities plan based on its own enrollment projections, existing capacity, planned facilities, funding, and student-generation assumptions.
A district’s calculation may account for:
- Current enrollment
- Expected enrollment growth
- Available classroom capacity
- Planned school construction or additions
- Estimated project costs
- State matching funds
- Local funding sources
- Student-generation rates by housing type
- Credits required under state and local law
Two nearby districts can produce very different proposed fees because their growth projections, available capacity, capital programs, housing patterns, and other funding sources are different.
A zero fee does not necessarily mean a district expects no growth. A high fee does not necessarily mean every proposed project will become unworkable.
What housing types may pay the fee?
King County’s draft summary applies the proposed fees to new residential development in categories including:
- Single-detached homes
- Middle-housing units
- Apartment units
Middle housing can include attached or smaller-scale housing types such as:
- Duplexes
- Triplexes
- Fourplexes
- Townhouses
- Cottage housing
- Other houseplex configurations recognized under county code
The proposed amount may vary according to housing category and bedroom count.
This matters because the school enrollment expected from a three- or four-bedroom detached home may differ from the assumptions used for a studio apartment or a two-bedroom townhouse.
Which projects may be exempt?
The draft plain-language summary identifies several categories that may qualify for exemptions.
They include:
- Accessory dwelling units
- Qualified low-income housing
- Some remodels or replacement structures
- Temporary housing
- Transitional housing
- Medical-hardship housing
- Certain community residential facilities
- Nursing homes
- Retirement centers
- Nonresidential development
- Projects already mitigated through the State Environmental Policy Act or another approved agreement
An exemption should never be assumed solely from the project description. The permit applicant should confirm the exemption with King County during the permitting process.
Are accessory dwelling units exempt?
The draft summary identifies accessory dwelling units as exempt.
This could matter to homeowners planning a detached or attached ADU in unincorporated King County. However, an impact-fee exemption does not remove other requirements involving zoning, building permits, utilities, septic systems, critical areas, or development standards.
When is the school impact fee paid?
King County’s plain-language summary indicates that school impact fees are normally collected when the building permit is issued.
However, Washington law requires jurisdictions collecting impact fees to maintain a deferral process for qualifying detached and attached single-family residential construction.
A qualifying applicant may be able to defer payment until one of the following:
- Final inspection
- Certificate of occupancy
- The first sale of the property after the building permit is issued
The deferral may not exceed 18 months from the building-permit issuance date. Washington law also allows a deferred-impact-fee lien to be recorded against the property.
Who pays the school impact fee?
The permit applicant or developer is generally responsible for the fee during permitting.
That does not necessarily mean the builder absorbs the cost without considering it elsewhere. Development costs may be reflected in:
- Land-acquisition decisions
- Project budgets
- Builder base prices
- Upgrade prices
- Lot premiums
- Seller proceeds
- Project phasing
- Incentive strategies
When a fee is deferred until the first sale, Washington law says payment is made from the seller’s proceeds unless the buyer and seller agree otherwise. The seller has responsibility for payment in the absence of another agreement.
New-construction buyers should still review the purchase agreement, title documents, settlement statement, and builder disclosures carefully. The contract should make clear whether any deferred fee remains unpaid and how it will be handled at closing.
Will the proposed school impact fees increase new-home prices?
School impact fees can add to the cost of development, but a fee does not guarantee an equal dollar-for-dollar increase in a home’s sale price.
Builders price homes based on several factors:
- Land cost
- Construction labor
- Materials
- Financing
- Roads
- Water and sewer
- Stormwater systems
- Permit expenses
- Utility connections
- Insurance
- Buyer demand
- Competing developments
- Home size and design
- Builder incentives
- Expected profit and risk
A builder may include the fee in the overall project budget, negotiate a lower land price, adjust the home mix, reduce another cost, or accept a smaller margin. In a strong market, some costs may be reflected in higher prices. In a competitive market, the builder may have less ability to raise prices.
For this reason, the most accurate conclusion is:
School impact fees may influence the cost of delivering new housing, but they do not predict the final price of an individual home.
Could the fees affect whether a project moves forward?
They could influence project feasibility, especially when combined with other development costs, but school impact fees are only one part of the calculation.
A developer may respond to higher costs by:
- Renegotiating the land purchase
- Revising the number or size of homes
- Changing the bedroom mix
- Building in phases
- Using an available payment deferral
- Reviewing available exemptions or credits
- Adjusting upgrade packages
- Delaying construction
- Seeking different financing
- Deciding not to proceed
The impact will vary significantly between a small infill project and a larger subdivision.
A 27-home project, for example, may evaluate fees differently from a single custom home or a large apartment development.
Could school impact fees reduce future housing supply?
School impact fees may affect the timing, cost, or feasibility of some projects, but it would be inaccurate to state that one proposed fee schedule will automatically reduce housing supply.
Housing production also depends on:
- Available land
- Zoning
- Permit timelines
- Infrastructure capacity
- Construction financing
- Interest rates
- Labor and material costs
- Environmental requirements
- Utility availability
- Builder demand
- Homebuyer demand
- Expected sales prices
The fees are intended to address another part of the growth equation: the need for adequate school facilities as new homes are added.
The policy discussion therefore involves a real tradeoff. New housing creates demand for infrastructure, while higher development costs can make housing more expensive or projects harder to complete.
What should new-construction buyers ask the builder?
Buyers should understand the total cost of the home and whether any impact-fee obligation remains unresolved.
Ask the builder or sales representative:
- Is the home inside city limits or unincorporated King County?
- Which agency issued the building permit?
- Which school district serves the property?
- Was a school impact fee assessed?
- What amount was charged?
- Has the fee already been paid?
- Was payment deferred?
- Is there a deferred-impact-fee lien?
- Will the fee be paid from seller proceeds at closing?
- Does the contract assign any responsibility to the buyer?
- Is the fee included in the advertised price?
- Which other development charges are included?
- Could permit costs change before construction is complete?
- Are builder incentives tied to a specific lender or closing provider?
Answers should be confirmed through the contract and closing documents rather than relying only on a verbal explanation.
How can buyers tell whether a property is in unincorporated King County?
Do not rely only on the mailing address.
A property may use the name of a nearby city for postal purposes while remaining outside that city’s legal boundaries.
Buyers can verify jurisdiction through:
- King County parcel records
- King County mapping tools
- The building permit
- The preliminary title report
- The seller disclosure
- City boundary maps
- The project’s land-use records
This is especially important near Maple Valley, Renton, Auburn, Enumclaw, Federal Way, and other cities with nearby unincorporated areas.
What does this mean for Maple Valley and Tahoma-area buyers?
Buyers comparing Maple Valley with nearby unincorporated Tahoma School District areas should verify which government has permitting authority.
Two homes may:
- Share a Maple Valley mailing address
- Be assigned to the same school district
- Be located only a few miles apart
- Have different development-fee rules
A home inside the City of Maple Valley may be governed by city ordinances. A home outside the city may fall under King County’s proposed schedule.
This topic also connects with future housing projects such as the proposed Glenshire Park development. Buyers should treat the school impact fee as one item within the broader development-cost picture rather than assuming it determines whether a project proceeds.
For additional local context, read about [the proposed Glenshire Park development in Maple Valley] and when the right time is to buy a home in Maple Valley.
School impact fees versus other new-construction expenses
School impact fees are only one part of the cost structure behind a new home.
Cost category | What it may cover | Who initially handles it |
|---|---|---|
School impact fee | Eligible school facilities tied to growth | Permit applicant or developer |
Building permit fee | Plan review, inspections, and permit administration | Builder or permit applicant |
Utility charges | Water, sewer, power, and connections | Builder, developer, or utility customer |
Transportation mitigation | Road or transportation improvements | Developer or permit applicant |
Stormwater improvements | Drainage and water-quality systems | Developer |
Builder upgrades | Buyer-selected materials or features | Buyer through purchase price |
HOA charges | Shared community maintenance or reserves | Homeowner after closing |
Closing costs | Loan, title, escrow, taxes, and related charges | Allocated by contract |
Buyers should compare the complete purchase and ownership cost rather than focusing on a single development fee.
Expert insight: what South King County buyers should know
The most important question is not simply, “Which school district has the lowest fee?”
The useful questions are:
- Where is the property legally located?
- Which government issued the permit?
- Has the fee already been paid?
- Is there a recorded deferral or lien?
- What is included in the builder’s price?
- How does the total cost compare with nearby resale homes?
- What incentives or concessions is the builder offering?
- Does the development timeline fit the buyer’s plans?
A lower school impact fee does not automatically make one project a better value. A higher fee does not automatically make another home overpriced.
Buyers should evaluate the full package, including location, home quality, lot size, financing, upgrades, HOA obligations, commute, expected maintenance, and available resale alternatives.
Frequently asked questions
What is a King County school impact fee?
It is a development charge used to help fund eligible school facilities needed to serve enrollment growth associated with new residential construction.
Where would the proposed 2027 fees apply?
The King County schedule would apply to qualifying new residential development permitted in unincorporated King County. City projects may be subject to separate municipal rules.
Which South King County districts are included?
The proposal includes Tahoma, Auburn, Enumclaw, Renton, Federal Way, Highline, and Fife, along with several other King County school districts.
Who pays the fee?
The permit applicant or developer normally handles the fee. If payment is deferred to the first sale, Washington law generally provides for payment from seller proceeds unless the contract states otherwise.
Are the fees included in the builder’s home price?
They may be incorporated into the project budget and pricing, but buyers should confirm this with the builder and review the purchase and closing documents.
Are accessory dwelling units exempt?
The current King County draft summary identifies accessory dwelling units as exempt. Other permitting and development requirements may still apply.
Can school impact fees be deferred?
Yes, qualifying detached and attached single-family residential permits may use a local deferral process. Washington law allows collection to be delayed until final inspection, certificate of occupancy, or the first sale, subject to applicable rules.
Will the proposed fees make new homes more expensive?
They may add to development costs, but the effect on an individual home’s price depends on land, construction, financing, demand, competition, and builder strategy.
Could school impact fees delay new construction?
They may influence a project’s budget or timing, but there is not enough information to conclude that a particular project will be delayed solely because of the fee.
When could the 2027 fees become final?
King County estimated submitting the finalized draft to the County Council in September 2026. Council review, amendments, public comment, and possible adoption would follow.
Helpful resources
King County proposed legislation
The King County permitting-legislation page provides the current proposal, district capital facilities plans, comment information, and the next steps in the ordinance process.
Washington impact-fee law
RCW 82.02.050 explains Washington’s impact-fee authority, proportionality requirements, payment deferrals, liens, and first-sale payment rules.
Washington impact-fee definitions
RCW 82.02.090 defines impact fees, development activity, public facilities, and system improvements.
King County permitting
The King County Permitting Division provides information for development and building activity in unincorporated King County.
Maple Valley buyer timing guide
Read when the right time is to buy a home in Maple Valley when comparing new construction with current resale opportunities.
South King County value guide
Review where South King County buyers can still find relative value in 2026 for broader local cost and location comparisons.
Planning your next move
If you are thinking about buying, selling, or planning your next move, our team is happy to help you think through your options and next steps.
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