Basement finish permits in City of Issaquah: fees, timeline & requirements (2026)
Everything you need to know about pulling a basement finish permit in City of Issaquah, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Community Planning & Development.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to City of Issaquah's source.
When does a basement finish need a permit in City of Issaquah?
Finishing or remodeling a basement is processed under the Single-Family Interior Remodel permit; no basement-specific square-footage exemption is published.
In the source's own words
“Apply for a Single-Family Interior Remodel Permit when remodeling a residential home.”Source ↗verified 2026-09-24
Required submittals
- floor plan w/ egress windows + ceiling heights
- electrical layout
- plumbing diagram
- mechanical / HVAC plan
- WSEC compliance form (newly conditioned space)
- smoke/CO alarm locations
Inspection sequence
- rough-in (electrical/plumbing/mechanical)
- framing
- insulation
- drywall
- final
Contractor specialties needed
general, plumbing, mechanical
Who can do this work in City of Issaquah?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout City of Issaquah and King County. Kolmo prepares the drawings and submittals, files the basement finish permit with Community Planning & Development, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a City of Issaquah basement finish quote.
Notes & caveats
Construction permit required for any habitable space addition. Smoke + CO alarms required (R314, R315). Any new circuits, plumbing fixtures, or HVAC requires trade permits.
Basement finish permit fee — Washington baseline, not City of Issaquah's own schedule
Worked example for a $40,000 basement finish project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $542.75 |
| Plan review | $352.79 |
| WA state surcharge | $6.5 |
| Estimated total | $902.04 |
Plan-review fee scales with valuation. State surcharge $6.50. Apply via https://mybuildingpermit.com. We have not read City of Issaquah's adopted fee schedule, so this is not City of Issaquah's fee: it walks the standard valuation table most Washington cities adopt by reference, as a rough guide. The real numbers are in City of Issaquah's fee schedule ↗. Impact/utility fees may apply separately.
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Issaquah basement finish — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (6).
- 3. Submit through the city portal: Community Planning & Development ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (Plan-review fee scales with valuation. State surcharge $6.50. Apply via https://mybuildingpermit.com.) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
We pull basement finish permits in City of Issaquah every month. We prepare the drawings and submittals, file with Community Planning & Development, handle reviewer comments, and build the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Basement finish permits in City of Issaquah — FAQ
When does a basement finish need a permit in City of Issaquah?
Finishing or remodeling a basement is processed under the Single-Family Interior Remodel permit; no basement-specific square-footage exemption is published.
How much does a basement finish permit cost in City of Issaquah?
For a $40,000 basement finish project, the estimated City of Issaquah permit fee is about $902.04 — building fee $542.75 + plan review $352.79 + surcharges. Fees scale with project valuation per the city schedule.