Tacoma ADU Permit Fees & Cost Calculator
Tacoma allows ADUs and requires a building-permit-based review, but the exact city fee schedule was not available in the provided official sources. State law requires cities to allow two ADUs on qualifying residential lots in urban growth areas and limits ADU impact fees to no more than 50% of the principal unit’s impact fees.[8]
Free ADU fee calculator
Estimate local ADU fees
Step 1 of 5: Location
The calculator uses staged city data from the ADUFee database with visible confidence levels and dated source tracking.
Fee overview
Do not use the non-official fee estimates in the search results as exact Tacoma fees.
Verify final costs directly with Tacoma Permits or the current city fee schedule before budgeting.
Washington state ADU rules may override older Tacoma rules where they conflict, especially for lot count, occupancy, and impact fees.
Tacoma’s current fee schedule was not directly accessible in the provided official sources, so exact dollar amounts are left null.
Utility-related charges may be split across city utility, sewer, stormwater, plumbing, electrical, and site-development reviews rather than a single ADU fee.
The user wants permit and pre-development fees, so the response emphasizes permit-related costs rather than construction costs.
FAQs
Are Tacoma ADU fee estimates official?
No. ADUFee.com provides planning estimates only. Final fees are set by the city, utility providers, school district, and other agencies.
What sources are used for Tacoma?
The database stores city, state, utility, school, county, and other source links where available. Each estimate should still be verified locally.
Can ADU fees vary within Washington?
Yes. Permit, utility, school, inspection, and impact fees can vary by jurisdiction, parcel, project size, utility provider, and local interpretation.