Addition permits in City of Bellevue: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition permit in City of Bellevue, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Bellevue Development Services.
When does a home addition need a permit in City of Bellevue?
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
- Architectural Plan (Bellevue SF Addition Permit — Required Documents)
- Boundary and Topographic Survey
- Construction Stormwater Pollution Prevention Plan (CSWPPP) — CSWPPP Short Form acceptable for projects with <7,000 sf clearing and <100 cu yd grading
- Energy Code Sheet or Envelope Summary (Residential Energy Code Worksheet)
- Residential Site Plan
- Storm Drainage Report
- Stormwater Site Plan
- Structural and Lateral Calculations
- Structural Plan
- Value of Improvements Form
- Geotechnical Report (per Bellevue Geotechnical Report Requirements — required for clearing/grading permits and slope/groundwater-sensitive sites)
- Critical Areas or Shoreline Land Use Permit — when site in critical area or shoreline overlay
- King County Health Department Approval — required for septic tank installation or if dwelling served by septic system AND there is a private well on property
- Title Report
Inspection sequence
- foundation/footing
- plumbing rough-in
- electrical rough-in
- mechanical rough-in
- framing
- insulation
- drywall
- final
Contractor specialties needed
general, electrical-01-or-02, plumbing, mechanical
Notes & caveats
Submittals pulled verbatim from the Bellevue Single-Family Addition Permit page (verified 2026-05-17). MBP submission path: Application=Building / Project=Single Family Residential / Activity=Addition. Document Waiver Form may be uploaded in place of a required document if it does not apply. Permit Center contact: 425-452-4898 / [email protected]. Building Review: 425-452-4121 / [email protected].
Addition permit fee estimate in City of Bellevue
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. Apply via https://mybuildingpermit.com. Computed from the City of Bellevue 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 Bellevue home addition — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (14).
- 3. Submit through the city portal: Bellevue Development Services ↗
- 4. Track review (typical: 30–90 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. Apply via https://mybuildingpermit.com.) and pick up the permit. Inspection card travels with the job.
Addition permits in City of Bellevue — FAQ
When does a home addition need a permit in City of Bellevue?
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 Bellevue?
For a $120,000 home addition project, the estimated City of Bellevue 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 Bellevue take to review a home addition permit?
Typical review window: 30–90 days.