Island County, WA — 2026 Building Permit Guide

On this page 6

§ 01

Permit authority

Island County Planning & Community Development Department - Building Division

Street address

1 NE 7th Street, Coupeville, WA 98239 (Whidbey); 121 N East Camano Drive, Camano Island, WA 98292 (Camano Annex)

Phone

(360) 679-7339 (Building); (360) 629-4522 (Camano); (360) 321-5111 (South Whidbey)

Buildingdept@islandcountywa.gov

Coverage

All properties in unincorporated Island County (Whidbey Island, Camano Island, and smaller islands).

Online portal

Island County Public Portal

Online Portal / Email / In-Person

Website

Department website

§ 02

When a permit is required

Permit triggers and exempt work for Island County

A building permit is required for all construction in unincorporated Island County.

Scope of work

Permit?

One-story detached accessory structures under 120 square feet

Exempt

Fences not over 7 feet high

Exempt

Retaining walls under 4 feet (with proper setbacks)

Exempt

Water tanks on grade (under 5,000 gallons)

Exempt

Sidewalks and driveways (under 30 inches above grade)

Exempt

Painting, tiling, carpeting, cabinets, countertops

Exempt

Ordinary repair and maintenance

Exempt

Exempt One-story detached accessory structures under 120 square feet
Exempt Fences not over 7 feet high
Exempt Retaining walls under 4 feet (with proper setbacks)
Exempt Water tanks on grade (under 5,000 gallons)
Exempt Sidewalks and driveways (under 30 inches above grade)
Exempt Painting, tiling, carpeting, cabinets, countertops
Exempt Ordinary repair and maintenance

Note: All roof-covering projects (new and replacement) require a building permit in Island County. Exemptions do not override Critical Areas Ordinance (CAO) or other local regulations. Verify applicability with County before proceeding.

Required documents

Two completed Building Permit Applications (in ink, 8-point font minimum)
Two sets of Building Plans (to scale)
Two sets of Engineering/Structural Plans (if applicable)
Washington State Energy Code Worksheet
Plot Plan (11x17 preferred, to standard engineering scale, max 1:60)
Site Registration confirmation
Approved Septic Permit/As-Built or Sewer District Connection Certificate
Approved Water Availability Verification (WAV) Form
Copy of Approved Access Permit (Island County Public Works)
Address Application confirmation
Contractor Verification (or Owner/Contractor Form for owner-builders)
Lender information (for projects over $5,000 per RCW 19.27.095)
Critical Areas Identification Form (if applicable)

Building code: 2021 International Building Code (IBC), 2021 International Residential Code (IRC), 2021 IEBC, IMC, IFGC, IFC, Uniform Plumbing Code, Washington State Energy Code, ICC A117.1-2017 (Accessibility), with Washington State amendments. Effective March 15, 2024. Roofing: All roof-covering projects (new and replacement) require a building permit.
Permit validity: Application expires if not submitted within specified timeframe. Permit validity governed by state law and local ordinance.
Owner-builder: Owner-builder exemption available with signed Owner/Contractor Form. Owner must agree to retain only registered contractors for assistance exceeding $500.
Contractor requirements: Washington State registered contractor required. All electrical work permitted through Washington State L&I (Department of Labor & Industries).

Source: Island County Planning & Community Development Department - Building Division ↗

§ 03

Application process

Typical processing: Pre-permit approvals typically require 1-3 months. Building permit review and issuance additional 2-4 weeks after all pre-permits obtained.

01

Complete Site Registration with County Planning & Community Development.
02

Obtain completed Septic Design from qualified septic designer and submit to Island County Health for review.
03

Obtain Approved Access Permit from Island County Public Works.
04

Obtain Address Assignment from County.
05

Obtain Approved Water Availability Verification (WAV) Form from County.
06

Prepare Master Building Permit Application (two copies, in ink, 8-point font minimum).
07

Prepare two sets of Building Plans (to scale) and Engineering/Structural Plans if applicable.
08

Complete Washington State Energy Code Worksheet.
09

Prepare Plot Plan (11x17 preferred, standard engineering scale, max 1:60).
10

Gather all supporting documents (Septic approval, Access Permit, Address confirmation, WAV form, Contractor Verification or Owner/Contractor Form).
11

Submit application via Public Portal, email, or in person.
12

County staff reviews for completeness and code compliance.
13

Pay permit fees.
14

Permit issuance.

Typical processing time: Pre-permit approvals typically require 1-3 months. Building permit review and issuance additional 2-4 weeks after all pre-permits obtained.

Source: Island County Planning & Community Development Department - Building Division ↗

§ 04

Fee schedule

Effective January 15, 2026 (40% increase); January 15, 2027 (additional 20% increase planned); CPI-indexed annually thereafter

Fee type

Amount

Minimum permit fee

$31.64 (base, 2024 rates; subject to 40% increase effective January 2026)

Plan check fee

Included in building permit fee calculation

Permit fee formula

Tiered formula based on ICC Valuation Data (2024 rates; verify current 2026 rates with County): $0-$500 = $31.64; $500.01-$2,000 = $31.64 + $4.10 per $100; $2,000.01-$25,000 = $93.19 + $18.84 per $1,000; $25,000.01-$50,000 = $526.54 + $13.60 per $1,000; $50,000.01-$100,000 = $866.46 + $9.42 per $1,000; $100,000.01-$500,000 = $1,337.49 + $6.32 per $1,000; $500,000.01-$1,000,000 = $3,867.46 + $6.40 per $1,000; $1,000,000.01+ = $7,066.35 + $4.92 per $1,000.

Trade permit fee

Plumbing: $36 base + $12 per fixture; Mechanical: $36 base + variable per equipment

Reinspection fee

$73 (excessive inspection on 3rd+ reinspection); $109 (outside normal business hours); $73 (additional plan review per hour)

Penalty (no permit)

Double the standard permit fee for work without permit

Technology Fee: 3% of total permit cost (all permits). Building valuation per SF: Unfinished Basement $18/SF; Semi-finished $28/SF; Finished Basement $91/SF; Dwellings (Good Construction) $212/SF; Qualified Affordable Housing $91/SF; Modular $79/SF; Garage/Barn (Conventional) $30/SF; Garage/Barn (Pole) $22/SF; Covered Deck/Porch $24/SF; Uncovered Deck $18/SF. Additional fees: Stock Plan Review (Homes/heated) $425; Stock Plan Review (Unheated garages) $109; Manufactured/Mobile Home (Park) $121; Manufactured/Mobile Home (Single-wide) $364; Manufactured/Mobile Home (Double-wide) $486; Demolition $182; Solar $FMV of racking; Swimming Pools $109/SF; Work Without Permit = double permit fee.

§ 05

Required inspections

Scheduling and sequence

How to schedule

Island County Public Portal (online)
Buildingdept@islandcountywa.gov (if portal issues) (email)
(360) 679-7339 (assistance) (phone)

Scheduling deadline: Schedule through Public Portal or contact department for availability
Inspection hours: Most offices closed to public except by appointment (verify current hours)

Typical sequence: Inspection results available through Public Portal account.

Source: Island County Planning & Community Development Department - Building Division ↗

§ 06

Frequently asked

Common questions about unincorporated Island County permits

01 Do I need a building permit in unincorporated Island County, WA? ▸

A building permit is required for all construction in unincorporated Island County.

02 How much does a building permit cost in unincorporated Island County, WA? ▸

Building permit fees in unincorporated Island County, WA are set by the local building department and vary by project type and valuation. The minimum permit fee is $31.64 (base, 2024 rates; subject to 40% increase effective January 2026). Fees are calculated as: Tiered formula based on ICC Valuation Data (2024 rates; verify current 2026 rates with County): $0-$500 = $31.64; $500.01-$2,000 = $31.64 + $4.10 per $100; $2,000.01-$25,000 = $93.19 + $18.84 per $1,000; $25,000.01-$50,000 = $526.54 + $13.60 per $1,000; $50,000.01-$100,000 = $866.46 + $9.42 per $1,000; $100,000.01-$500,000 = $1,337.49 + $6.32 per $1,000; $500,000.01-$1,000,000 = $3,867.46 + $6.40 per $1,000; $1,000,000.01+ = $7,066.35 + $4.92 per $1,000.. Plan check fee: Included in building permit fee calculation.

03 How do I apply for a building permit in unincorporated Island County, WA? ▸

To apply for a building permit in unincorporated Island County, WA, follow these steps: 1. Complete Site Registration with County Planning & Community Development. 2. Obtain completed Septic Design from qualified septic designer and submit to Island County Health for review. 3. Obtain Approved Access Permit from Island County Public Works. 4. Obtain Address Assignment from County. 5. Obtain Approved Water Availability Verification (WAV) Form from County. 6. Prepare Master Building Permit Application (two copies, in ink, 8-point font minimum). 7. Prepare two sets of Building Plans (to scale) and Engineering/Structural Plans if applicable. 8. Complete Washington State Energy Code Worksheet. 9. Prepare Plot Plan (11x17 preferred, standard engineering scale, max 1:60). 10. Gather all supporting documents (Septic approval, Access Permit, Address confirmation, WAV form, Contractor Verification or Owner/Contractor Form). 11. Submit application via Public Portal, email, or in person. 12. County staff reviews for completeness and code compliance. 13. Pay permit fees. 14. Permit issuance.

04 How long does it take to get a building permit in unincorporated Island County, WA? ▸

Building permit processing times in unincorporated Island County, WA typically run Pre-permit approvals typically require 1-3 months. Building permit review and issuance additional 2-4 weeks after all pre-permits obtained.. Timelines can vary based on project complexity and current department workload.

05 What work is exempt from building permits in unincorporated Island County, WA? ▸

Not all construction work requires a permit in unincorporated Island County, WA. The following work is generally exempt: One-story detached accessory structures under 120 square feet; Fences not over 7 feet high; Retaining walls under 4 feet (with proper setbacks); Water tanks on grade (under 5,000 gallons); Sidewalks and driveways (under 30 inches above grade); Painting, tiling, carpeting, cabinets, countertops; Ordinary repair and maintenance. Note: All roof-covering projects (new and replacement) require a building permit in Island County. Exemptions do not override Critical Areas Ordinance (CAO) or other local regulations. Verify applicability with County before proceeding. When in doubt, confirm with the local building department before starting work.

06 How do I schedule a building inspection in unincorporated Island County, WA? ▸

Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Island County, WA via: Island County Public Portal, Buildingdept@islandcountywa.gov (if portal issues), (360) 679-7339 (assistance). Schedule through Public Portal or contact department for availability.

last verified April 2026 source Island County Planning & Community Development Department - Building Division ↗ entry id permits/washington/island/unincorporated

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Educational reference. Permit rules and fees change — confirm current requirements directly with Island County Planning & Community Development Department - Building Division before applying. Jaspector is not legal advice.

Unincorporated Island County