Basement finish permits in Lynnwood: fees, timeline & requirements (2026)
Everything you need to know about pulling a basement finish permit in Lynnwood, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Lynnwood Development & Business Services.
Free lookup, no account needed — the office that issues the permit at your address, and a layout of the room, cited to Lynnwood's source.
When does a basement finish need a permit in Lynnwood?
2021 IRC R310: every sleeping room below grade requires emergency escape and rescue opening (egress window). Min sill height 44in, min net clear opening 5.7 sq ft (5.0 grade-floor), min width 20in, height 24in. Ceiling height min 7ft (R305). Entire newly conditioned area must comply with WSEC R402.
How Lynnwood adopted this rule
The threshold comes from the state code (WAC 51.51), which Lynnwood adopts by reference in the provision quoted below.
“As amended by this chapter and the State of Washington Building Code Council under Chapter 51-51 WAC, the latest adopted version of the International Residential Code (IRC), published by the International Code Council, except Chapters 11 and 25 through 43”Source ↗verified 2026-10-02
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 contractor · Electrician (journey-level 01 or residential 02) · Plumber · Mechanical contractor
Who can do this work in Lynnwood?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Lynnwood and Snohomish County. Kolmo prepares the drawings and submittals, files the basement finish permit with Lynnwood Development & Business Services, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Lynnwood 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 estimate in Lynnwood
Worked example for a $40,000 basement finish project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $1,009.88 |
| Plan review | $656.42 |
| Technology surcharge | $41.66 |
| WA state surcharge | $6.50 |
| Estimated total | $1,714.46 |
Lynnwood prices a basement finish's building permit on the value of the work, by the ICC valuation table or the building's square footage, whichever is greater: $114 up to $1,000, $114 for the first $1,000 plus $5.74 for each $100 more up to $2,000, $171.35 for the first $2,000 plus $25.23 for each $1,000 more up to $25,000, and $751.73 for the first $25,000 plus $17.21 for each $1,000 more up to $50,000. Plan review is 65% of that fee. Plumbing and mechanical permits for a remodel are each $257 for up to 4 fixtures or pieces of equipment and $22 for each one more, and the City, not L&I, issues the electrical permit: $147 for up to 10 circuits added or altered, $15 for each more circuit up to a $200 total. A 2.5% technology fee is added (LMC 3.104). Computed from Lynnwood's adopted fee schedule · source ↗. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.
How to apply yourself
- 1. Check who issues the permit. Run an address lookup for your basement finish in Lynnwood — we'll confirm which office issues the permit at that address, and you can lay out the room.
- 2. Assemble submittals: the 6 documents under Required submittals above.
- 3. Submit through the city portal: Lynnwood Development & Business Services ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (about $1,714 for a $40,000 project) and pick up the permit. Inspection card travels with the job.
Or have Kolmo do it
Kolmo prepares the drawings and submittals, files with Lynnwood Development & Business Services, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Basement finish permits in Lynnwood — FAQ
When does a basement finish need a permit in Lynnwood?
2021 IRC R310: every sleeping room below grade requires emergency escape and rescue opening (egress window). Min sill height 44in, min net clear opening 5.7 sq ft (5.0 grade-floor), min width 20in, height 24in. Ceiling height min 7ft (R305). Entire newly conditioned area must comply with WSEC R402.
How much does a basement finish permit cost in Lynnwood?
For a $40,000 basement finish project, the estimated Lynnwood permit fee is about $1,714.46 (building fee $1,009.88 + plan review $656.42 + surcharges) from Lynnwood's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.