Bellevue exempts ADUs from transportation and school impact fees in practice, consistent with Washington HB 1337 (RCW 36.70A.696), which caps any ADU impact fee at 50 percent of the single-family rate. Only standard plan-review and building-permit fees apply, plus utility connection charges if a new water or sewer service is needed.
Under RCW 36.70A.696, any impact fee imposed on an ADU in Washington must not exceed 50 percent of the impact fee that would apply to a primary single-family residence. Bellevue's current practice is to exempt ADUs from transportation and school impact fees. School impact fees in Bellevue are set under BCC 22.18 and vary by school district (Bellevue, Issaquah, Renton, Lake Washington). Transportation impact fees are administered under BCC 22.16 with 2025 rates published in the Transportation Impact Fee Program Report. ADU applicants still pay standard plan-review fees, the building permit fee scaled to construction valuation under the WA State Building Code fee schedule, and trade permit fees for electrical, plumbing, and mechanical work. Water and sewer connection fees through the Bellevue Utilities Department apply only if a new meter or service line is needed; sharing utilities with the primary dwelling avoids these charges. Stormwater fees apply where impervious surface thresholds are exceeded.
Failure to pay required permit and connection fees blocks permit issuance and inspection scheduling. Construction without paid permits triggers civil penalties under BCC 1.18 of up to $500 per day, double permit fees on legalization, and possible utility service refusal until charges are paid.
Bellevue, WA
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Bellevue, WA
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Bellevue, WA
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Bellevue, WA
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Bellevue, WA
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Bellevue, WA
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Side-by-side rule comparisons with other cities in King County.
See how other cities in King County handle adu impact fees.
See how Bellevue's adu impact fees rules stack up against other locations.
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