ADU Permit Fees & Costs in Spokane, Washington
Everything you need to apply for a adu permit in Spokane, Washington — documents, fees, steps, and a downloadable submission packet.
Key Facts
- Permit required
- Yes
- Submission method
- Online
- Typical fee range
- $1,800 – $4,125
- Review time
- Varies by jurisdiction
- Inspections
- 5 inspections required
Limited Data Available
Some information on this page has not been fully verified. We're working to improve data quality. Always verify with Spokane directly.
Estimated Total Fees
$1,800 – $4,125
Range based on typical residential solar PV system. Actual fees depend on project valuation and system size.
| Fee Component | Range | Confidence |
|---|---|---|
| ADU Permit Fee[1][2] Planning permit fee approximately $800-1200, Building permit fee $400-1300 based on valuation. Impact fees may apply for schools and capital improvements. | $1,200 – $2,500 | ✓ |
| Plan Review Fee[3][4] Plan review fee is typically 50-65% of the permit fee. | $600 – $1,625 | ✓ |
| Estimated Total | $1,800 – $4,125 |
Fees shown as ranges. Always verify the exact amount with Spokane before submission. Additional fees may apply for expedited review or resubmittals.
Generate your permit packet
Get a personalized ADU permit packet for Spokane, Washington — tailored to your project details.
- Complete list of required forms and documents
- Pre-filled templates: Permit Cover Sheet
- Fee breakdown: $600–$2,500 estimated total
- Step-by-step City of Spokane portal submission guide
- Inspection prep checklist (5 items)
- Personalized for your specific project details
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Required Documents
Spokane requires the following documents for this permit application.
Site Plan
Scaled site plan showing property boundaries, existing structures, proposed ADU location, setbacks, and parking
Floor Plans
Architectural floor plans showing all rooms, dimensions, and layout of ADU
Elevation Drawings
Front, rear, and side elevations showing building height, materials, and fenestration
Utility Plans
Plans showing water, sewer, electrical, and gas connections to ADU
Proof of Ownership
Current property deed or title showing proof of ownership
Environmental Assessment
SEPA environmental checklist if required by jurisdiction
Structural Calculations
PE-stamped structural calculations for foundation and framing
Permit Process
Follow these steps to submit your permit application through City of Spokane.
- 1
Pre-Application Meeting
Schedule meeting with Planning staff to discuss ADU proposal, zoning compliance, and preliminary requirements
- 2
Application Submission
Submit complete building permit application with all required documents and fees
You'll need: Site Plan, Floor Plans, Elevation Drawings, Proof of Ownership, Environmental Assessment
- 3
Technical Review
Planning staff reviews for zoning compliance, code violations, and technical requirements
You'll need: Utility Plans, Structural Calculations
- 4
Permits Issued
After approval, building permits are issued and ready for construction
- 5
Construction Inspections
Inspectors verify compliance at foundation, framing, electrical, plumbing, and final stages
- 6
Certificate of Occupancy
Final inspection approval and certificate of occupancy issued
Authority Sources
Data on this page is sourced from official records published by the permitting authority. Always verify requirements directly before submitting.
Verified February 15, 2026
Verified February 15, 2026
Verified February 15, 2026
Frequently Asked Questions
- Do I need a adu permit in Spokane?
- Yes. Spokane requires a adu permit for this type of project. Submitting without a permit may result in fines, required removal, or complications when selling your property.
- How long does adu permit approval take in Spokane?
- Processing times in Spokane vary depending on project complexity and current review volume. The process involves 6 steps. Contact Spokane Development Services for current timelines.
- What documents are required for a adu permit in Spokane?
- Spokane requires 7 documents including Site Plan, Floor Plans, Elevation Drawings, Utility Plans, and others. See the full list above for details.
- What happens if I build without a adu permit in Spokane?
- Building without a permit in Spokane can result in stop-work orders, fines, required removal of work, difficulty selling your property, and insurance complications. It is strongly recommended to obtain proper permits before starting work.
- Can PermitMagic help prepare my adu permit submission in Spokane?
- Yes. PermitMagic generates a submission-ready packet tailored to Spokane's requirements, including a document checklist, workflow steps, and authority references. Start a permit plan to get your personalized packet.
- How much does a adu permit cost in Spokane?
- ADU permit fees in Spokane typically range from $1,800 to $4,125, depending on project scope. Fees may include building permit, plan review, and technology surcharges. Verify current fees with Spokane.
Related Permits
Other permits in Spokane
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Answer a few project questions and get a adu permit packet for Spokane, Washington — with every document, form, and fee organized for submission.
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