Addition permits in City of Lakewood: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition permit in City of 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 Community Development..
When does a home addition need a permit in City of 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).
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
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 City of Lakewood
Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $1,105.75 |
| Plan review | $718.74 |
| WA state surcharge | $4.5 |
| Estimated total | $1,828.99 |
Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 per building permit. Trade permits (E/P/M) separate. Computed from the City of Lakewood fee bracket schedule · source ↗. Impact/utility fees may apply separately.
How to apply
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Lakewood home addition — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (11).
- 3. Submit through the city portal: Lakewood Community Development. ↗
- 4. Track review (typical: 30–120 days). Respond to reviewer comments promptly.
- 5. Pay issuance fees (Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 per building permit. Trade permits (E/P/M) separate.) and pick up the permit. Inspection card travels with the job.
Addition permits in City of Lakewood — FAQ
When does a home addition need a permit in City of 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 City of Lakewood?
For a $120,000 home addition project, the estimated City of Lakewood permit fee is about $1,828.99 — building fee $1,105.75 + plan review $718.74 + surcharges. Fees scale with project valuation per the city schedule.
How long does City of Lakewood take to review a home addition permit?
Typical review window: 30–120 days.