Addition permits in Lakewood: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition permit in Lakewood, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Lakewood Planning and Public Works Department.
Free lookup, no account needed — your lot polygon, zoning, setbacks and overlays, cited to Lakewood's source.
When does a home addition need a permit in Lakewood?
2021 IRC R105.1 requires permits for "construction, enlargement, alteration, repair, movement, removal, conversion, or demolition" of structures. Additions are never exempt under R105.2. Footprint additions trigger zoning compliance (setbacks, lot coverage, height); vertical additions trigger structural review for the existing foundation/wall framing. WSEC R402-R403 applies to new conditioned area. SEPA threshold typically ≥12,000 sqft total floor area (RCW 43.21C).
How Lakewood adopted this rule
The threshold comes from the state code (WAC 51.51), which Lakewood adopts by reference in the provision quoted below.
“Pursuant to RCW 19.27.031, the following codes as amended by the Washington State Building Code Council herein adopted and further amended, shall be collectively known as the Lakewood Building Code: A. The 2021 Edition of the International Building Code (IBC), including Appendix Chapters E, G, and J, published by the International Code Council and amended by the Washington State Building Code Council in Chapter 51-50 WAC, is hereby adopted by reference and as subsequently amended by this chapter.”Source ↗verified 2026-04-29
What Lakewood says in its own permit handout
From Do I Need A Building Permit? (dated May 20, 2025), published by Lakewood. This is the jurisdiction's own guidance on its permit process, not the ordinance text — where the two differ, the code governs.
“Examples of Projects That WILL Require a Building Permit:
- All residential or commercial additions (adding square footage to existing buildings).
- A structure or new impervious surface of ANY size located within the shoreline buffer or in a critical area or their buffers and setbacks. This includes decks and patios under 18 inches in height.
- Residential storage buildings over 120 square feet.”
Handout ↗read 2026-09-05
Required submittals
- Site plan with north arrow, property lines, setbacks, existing + proposed structures, lot coverage calculation
- Floor plan existing and proposed (dimensioned, 1/4" = 1' min)
- Elevations all affected sides (existing + proposed, height-to-grade)
- Foundation plan + footing details (if footprint addition)
- Framing plan (floor + roof + lateral)
- Wall section with insulation values per WSEC
- Structural calculations (when ≥500 sqft addition or out of IRC prescriptive envelope)
- WSEC compliance form (Energy Code Compliance Certificate)
- Manual J HVAC sizing calculation for new conditioned area
- Window/door schedule with NFRC U-factor and SHGC values
- Soils report if footing on slope or expansive soils
Inspection sequence
- Foundation/footing
- Plumbing rough-in
- Electrical rough-in
- Mechanical rough-in
- Framing
- Insulation
- Drywall
- Final
Contractor specialties needed
General contractor
Who can do this work in Lakewood?
Kolmo Construction is a licensed Washington general contractor — KOLMOL*753JS, active through April 10, 2027, bonded and insured — working throughout Lakewood and Pierce County. Kolmo prepares the drawings and submittals, files the home addition permit with Lakewood Planning and Public Works Department, carries the project through review and inspections, and performs the construction. Call (206) 410-5100 for a Lakewood home addition quote.
Notes & caveats
From Lakewood handout B10 (Residential Remodel): "Structure Addition – Construction of new square footage attached to an existing structure, this may include interior or exterior alterations to the existing structure. This permit type does not include Attached or Dwelling Units (ADU) or habitable, detached structures." Additionally: "For additions or alternations outside of the structure, an additional Shoreline Exemption permit shall be required if the work is within 200ft of the Ordinary High-Water Mark (OHWM). This is not applicable to interior work only."
Addition permit fee estimate in Lakewood
Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $1,400 |
| Plan review | $910 |
| Administrative base fee | $90 |
| Technology surcharge (4%) | $96 |
| WA state surcharge | $6.50 |
| Estimated total | $2,502.50 |
Lakewood prices an addition's building permit on the value of the work, set by the Building Official: $805 for the first $50,000 plus $9.00 for each $1,000 more up to $100,000, and $1,255 for the first $100,000 plus $7.25 for each $1,000 more up to $500,000. Plan review is 65% of the building permit fee, one hour at the least, and the $6.50 state building code fee applies. Plumbing and mechanical work is priced on the City's unit tables, a $34 issuance fee plus, for example, $12 a plumbing fixture or $18 a fan, with plan review at 25% where plans are required. The electrical permit comes from Tacoma Power or L&I, at their fees. Every permit application carries the City's $90 administrative base fee, mechanical permits excepted, and a 4% technology fee (2026 Fee Schedule). Apply through Lakewood's Online Permit Center (app.oncamino.com/
How to apply yourself
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your home addition in Lakewood — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline, critical-area or historic overlays.
- 2. Assemble submittals: the 11 documents under Required submittals above.
- 3. Submit through the city portal: Lakewood Planning and Public Works Department ↗
- 4. Track review. Respond to reviewer comments promptly.
- 5. Pay issuance fees (about $2,503 for a $120,000 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 Lakewood Planning and Public Works Department, handles reviewer comments, and builds the project.
Licensed WA general contractor KOLMOL*753JS · bonded & insured
Addition permits in Lakewood — FAQ
When does a home addition need a permit in Lakewood?
2021 IRC R105.1 requires permits for "construction, enlargement, alteration, repair, movement, removal, conversion, or demolition" of structures. Additions are never exempt under R105.2. Footprint additions trigger zoning compliance (setbacks, lot coverage, height); vertical additions trigger structural review for the existing foundation/wall framing. WSEC R402-R403 applies to new conditioned area. SEPA threshold typically ≥12,000 sqft total floor area (RCW 43.21C).
How much does a home addition permit cost in Lakewood?
For a $120,000 home addition project, the estimated Lakewood permit fee is about $2,502.50 (building fee $1,400 + plan review $910 + surcharges) from Lakewood's adopted fee schedule. Land use, fire and engineering review, intake, impact and utility fees, where they apply, are charged separately.