Bolthole Index

Island County, Washington

Building permits, zoning and land rules in Island County, Washington

59Index Score / 100
#16 of 39 in Washington

Unincorporated Island County, Washington requires building permits for covered construction and administers Title 17 zoning that varies by district12. A single-family submittal needs approved water, septic or sewer, access and address documentation, so start those approvals before filing house plans13. Island County Public Health enforces Washington's onsite-sewage rules locally4.

At a glance

Building permit
Required for homes and other covered construction in unincorporated Island County, including reroofing15
Zoning
County Title 17 zoning applies in unincorporated areas; standards vary by district26
Septic
Island County Public Health enforces state onsite-sewage rules and handles local review and permitting47
Building inspections
Request inspections and retrieve results through the Island County Public Portal8
Owner-builder
Exempt from contractor registration for qualifying work on your own property, but not from permits9
Manufactured home
Permitted wherever a single-family dwelling is permitted, subject to project approvals10
Accessory dwelling
Attached and detached ADUs are allowed in several county-administered rural zones11
RV living
A temporary RV addition may use a Temporary Use Permit; permanent occupancy could not be confirmed12

Who to call

Building permits

Island County Planning & Community Development Department - Building Permits

Building permits, zoning administration, flood development permits and the Floodplain Administrator function for unincorporated Island County (Whidbey and Camano Islands)

360-679-7339

1 NE 6th Street, Coupeville, WA 98239

Septic permits

Island County Public Health - Onsite Sewage Program

Septic (onsite sewage) system site evaluation, design review, permitting and inspection, and licensing of septic professionals, for Island County

360-679-7350

1 NE 6th Street, Coupeville, WA 98239

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Island County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Island County, Washington?

Yes. Unincorporated Island County requires building permits for homes and other covered construction, and the county expressly requires a building permit for new and replacement roofing15. Washington's state building code is in effect in every county and city, subject to statutory exceptions13. Island County will not accept a building-permit submittal without the required site registration, septic design by a qualified designer submitted to Health for review, approved access permit, address and water-availability verification1. Island County publishes land-use and building fee schedules, but the building figures are estimates rather than necessarily the amount due at submittal1415. An owner may qualify for Washington's contractor-registration exemption when working on their own property, but that exemption does not erase building, trade, land-use or inspection requirements and does not cover work performed to sell, demolish or lease the property9. Island County’s critical-areas exemption covers existing and ongoing agriculture in existence as of October 1, 1998; it does not establish a general agricultural-building permit exemption16.

Who is the Island County building department, and how do you reach it?

Island County Planning & Community Development handles building permits, zoning administration and flood development review for unincorporated Island County from 1 NE 6th Street in Coupeville; call 360-679-7339, while the Camano Annex main number is 360-387-344317. Building applications require plans, a plot plan, an energy-code worksheet and the applicable access, address, water, septic or sewer documentation18. Island County building-inspection requests and results use the Public Portal; the county also allows email requests when portal assistance is unavailable8. For permitted work governed by the state energy code, the work must remain visible and accessible for inspection, and the building must receive a final inspection before occupancy19. Island County land-use applications may be emailed; in-person submittals require an appointment20.

Does Island County have zoning?

Island County administers Title 17 zoning in unincorporated areas; the county’s zoning map does not establish county administration of incorporated municipal ordinances26. Island County’s zoning ordinance regulates the type, scale and intensity of development by district21. The county housing page summarizes housing options by zone and points to separate Freeland Non-Municipal Urban Growth Area standards; it is not a complete district schedule2223. Manufactured homes are permitted wherever a single-family dwelling is permitted, subject to project approvals10. Attached and detached ADUs are identified as allowed in Rural, Rural Residential, Rural Agriculture, Rural Forest and Commercial Agriculture zones, with applicable building or land-use permits still required11. Shoreline environment designations determine shoreline permitting and marine buffers or setbacks24. Confirm the parcel’s district with Planning & Community Development: the online zoning layer warns that amendments and annexations may not be accurately reflected25.

How do septic permits work in Island County?

Island County Public Health's Onsite Sewage Program enforces Washington's onsite-sewage rules locally and handles septic review and permitting426. The county provides separate permit forms for new construction or conforming repairs and for non-conforming repairs7. For a single-family building application in unincorporated Island County, provide an approved septic permit/as-built or applicable sewer-district connection certificate and a Water Availability Verification form approved within the year; separate water forms cover public systems and individual wells3. Conventional gravity systems are inspected every 3 years, while pressure and alternative systems are inspected annually; a sale also triggers inspection when the system has not been inspected within its latest compliance period27. None of Island County’s mapped soils is rated “not limited” for a conventional drain field; that does not make septic impossible, but a site evaluation may point toward a more involved design28. Well drilling is separately under the Washington Department of Ecology29.

Can you live in an RV or tiny home on your land in Island County?

Island County identifies the temporary addition of an RV to residential property as a Temporary Use Permit under county code; the use must involve no permanent improvements and last only for a limited duration12. That rule does not establish permission for permanent RV occupancy, so ask Planning & Community Development before treating an RV as a residence17. Washington allows a tiny house built to the state building code, including one on wheels, up to 400 square feet, but local approval still controls its foundation, installation and location30. We could not confirm Island County’s specific tiny-home occupancy rule or minimum dwelling size; ask Planning & Community Development about the proposed dwelling17. A manufactured home is the clearer documented path: Island County permits one as a single-family dwelling wherever that use is allowed, subject to the same building, land-use, utility, septic and access approvals that apply to the project10.

Building a home in Island County: the steps, in order

  1. Ask Planning & Community Development to identify the parcel's zoning district and flag shoreline or other land-use review224.
  2. Establish sewage and water with an approved site registration, septic permit or as-built, or a public-sewer commitment, then obtain the approved septic/as-built or applicable sewer certificate and current Water Availability Verification required for a single-family submittal313.
  3. Obtain driveway approval from Island County Public Works for a county road or from the Washington Department of Transportation when the first access is onto a highway32.
  4. If the site is in a floodplain, complete the required pre-application conference before filing the Flood Development Permit33.
  5. Submit the building plans, plot plan, energy worksheet, address and supporting approvals, then confirm the calculated fees1814.
  6. Request building inspections through the Island County Public Portal and leave energy-code work visible until approved819.

What should you check before buying land in Island County?

Confirm the zoning district and allowed housing type first because Island County's development controls vary by district and location2125. For waterfront land, identify the shoreline environment designation because each designation has its own permitting and marine buffer or setback standards24. If you plan to divide the tract, confirm the applicable long-plat, short-plat or other county subdivision process before relying on a future split34. Verify legal driveway access because a county-road connection needs Island County approval and first access onto a state highway needs Washington Department of Transportation approval35. Test wastewater feasibility early: none of Island County’s mapped soils is rated “not limited” for a conventional drain field, so evaluate the site rather than assuming septic is impossible; a proposal must document an approved septic option or sewer service2831. Typical property tax is about 0.7% of value, with a median annual bill near $3,7653637.

Watch-outs

  • For a garage or shop on a vacant parcel under 2.5 acres without a residence, Island County limits the structure to 800 square feet1.
  • Floodplain development requires a Flood Development Permit and a pre-application conference, while shoreline buffers and setbacks depend on the shoreline environment designation3324.
  • Island County documents only a limited-duration Temporary Use Permit path for adding an RV to residential property; permanent RV occupancy and general temporary camping could not be confirmed12.

Sources

  1. Building Permits, quoted and re-checked
  2. Layer: Zoning (ID: 2), quoted and re-checked
  3. Building Permit Submittal Requirements, quoted and re-checked
  4. Onsite Sewage (Septic) Systems, quoted and re-checked
  5. Building Permits, quoted and re-checked
  6. Layer: Zoning (ID: 2), quoted and re-checked
  7. Documents and Forms, quoted and re-checked
  8. Building Department, quoted and re-checked
  9. RCW 18.27.090: Exemptions, quoted and re-checked
  10. islandcountywa.gov, quoted and re-checked
  11. islandcountywa.gov, quoted and re-checked
  12. Land-Use Applications, quoted and re-checked
  13. RCW 19.27.031: State building code—Adoption—Conflicts—Opinions, quoted and re-checked
  14. Land-Use Applications, quoted and re-checked
  15. Land-Use Applications, quoted and re-checked
  16. Critical Areas, quoted and re-checked
  17. Island County Planning & Community Development Department - Building Permits (islandcountywa.gov)
  18. Building Department, quoted and re-checked
  19. WAC 51-11R-10500 — Section R105—Inspections (Washington statewide rule), quoted and re-checked
  20. Land-Use Applications, quoted and re-checked
  21. Comprehensive Plan | Island County, WA, quoted and re-checked
  22. Housing Options, quoted and re-checked
  23. Housing Options, quoted and re-checked
  24. Shorelines, quoted and re-checked
  25. Comprehensive Plan | Island County, WA, quoted and re-checked
  26. Island County Public Health - Onsite Sewage Program (islandcountywa.gov)
  27. islandcountywa.gov, quoted and re-checked
  28. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  29. islandcountywa.gov, quoted and re-checked
  30. Tiny Houses (Washington statewide rule), quoted and re-checked
  31. Site Plan Review, quoted and re-checked
  32. Building Department, quoted and re-checked
  33. Building Permits, quoted and re-checked
  34. Land-Use Applications, quoted and re-checked
  35. Building Department, quoted and re-checked
  36. Effective property tax rate: Bolthole Index county data
  37. Median property tax bill: Bolthole Index county data

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like all 6 of its neighbors, Island County has countywide zoning.

RuleIsland CountyKitsap CountySnohomish CountySkagit CountySan Juan CountyKing CountyJefferson County
Building permitRequiredLimitedRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Public HealthKitsap Public Health DistrictCounty Health Dept.County Public HealthCounty Health & Community ServicesPublic HealthCounty Public Health

County locator

Island County in Washington

59
County map
Island County highlighted among the Washington counties · colored by Index score

How Island County scores

Seclusion41100% ev.
Self-Sufficiency61100% ev.
Admin Boringness41100% ev.
Durability72100% ev.
Property Autonomy50100% ev.
Carry Cost35100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$647kTypical home
0.7%Property tax
$16,100Land / acre
27.6"Annual rain
2.7% of yrsSevere drought
0 / yr (+0)Mid-century 100°F days
22 daysMid-century dry spell
0.8" (+4.2%)Mid-century 1-day rain
1.51×Wildfire change factor
100%Forward climate coverage
$1,409Home insurance / yr
2.7% / yrInsurance growth
0.59%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
51,703People within 30 min
3,239,675People within 2 hr
267,526Radius comparison (15 mi)
413.8People / sq mi
11.4%Federal land
85.4%Land at 15% slope or less
0%Soils rated "not limited" for septic (strict USDA rating)
0 acWorkable land screen
35.6%Wooded land
89.2 tonsBiomass / forest ac
51°FAvg temp

Scout Island County

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Cities and towns in Island County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Oak Harbor

Answers from the rulebook for Island County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Island County rules

  • Building permitRequired

    Building-permit submittals for construction in Island County.

    • Starting March 1, 2024, site registration, septic design, approved access permit, address, and water availability verification are required for submittal.
    • Flood development pre-application meetings are required before a flood development permit submittal.
    • Requirements may differ in incorporated jurisdictions.

    effective date: 2024-03-01

    “To submit a building permit in Island County, a site registration and septic design, along with approved access permit, address, and water availability verification will be required starting March 1, 2024. Septic Design must be completed by a qualified septic designer and submitted to Health for review. Permits without these items will not be accepted for submittal.”
    2 more reviewed findings on this topic
    • Limited — New and replacement roofing projects in Island County.
      “Reminder: New and replacement roofing projects require a building permit”
    • Required — County-administered building permit submissions for construction in unincorporated Island County, including single-family residences and other covered construction.
      “To submit a building permit in Island County, a site registration and septic design, along with approved access permit, address, and water availability verification will be required starting March 1, 2024. Septic Design must be completed by a qualified septic designer and submitted to Health for review. Permits without these items will not be accepted for submittal.”
  • InspectionsLimited

    Island County building inspections.

    • Inspection requests must be made through the county Public Portal; inspection results are available through the portal.
    • The reviewed source does not state a universal inspection schedule for every project type.
    “All Building Inspection requests must be made through the Island County Public Portal.”
    One more reviewed finding on this topic
    • Limited — Building inspection requests administered by Island County.
      “All Building Inspection requests must be made through the Island County Public Portal. All Building Inspection Results are available through your Public Portal account.”
  • County-wide zoningPresent (with conditions)

    Island County's zoning ordinance and zoning districts under the Island County Municipal Code.

    • The official county page describes regulation by specific zoning districts; parcel-level applicability depends on the applicable district and other development regulations.
    • The county states that the 2025 development-regulation code changes went into effect immediately upon adoption and are used with new permits.
    “The Zoning Ordinance is part of the Island County Municipal Code and regulates the type, scale, and intensity of development which may occur in specific zoning districts, as recommended by the Comprehensive Plan.”
    One more reviewed finding on this topic
    • Present (with conditions) — Island County Code zoning and land-use regulation in county-administered areas.
      “During this process, it became clear that there is limited awareness of what housing options (other than single family housing) are currently available in the rural areas under Island County Code. This page provides links to explanatory PDFs that outline each housing type, what zone it is allowed, and provides a summary of the standards.”
  • Local zoningVaries (with conditions)

    The countywide aggregate of local zoning controls in Island County, including district-specific county zoning classifications and any separate municipal or other local zoning regimes within the county.

    • The county's zoning ordinance regulates development in specific zoning districts, so applicable controls vary by district and location.
    • The official county zoning layer identifies current zoning classifications for all of Island County pursuant to ICC 17.03.
    • The zoning layer warns that zoning amendments and annexations since 1999 may not be accurately reflected and that some classifications may be slightly shifted; parcel-specific confirmation should use the Planning Department's official zoning records or current code.
    “The layer shows the current Zoning classifications for all of Island County, pursuit to ICC 17.03. Island County and Community Development owns this layer.”
    3 more reviewed findings on this topic
    • Varies (with conditions) — Aggregate local zoning across Island County county-administered rural areas and the Freeland Non-Municipal Urban Growth Area.
      “Visit the Freeland Zoning Code for what housing types are allowed in the Freeland Non-Municipal Urban Growth Area (NMUGA)”
    • Varies (with conditions) — The countywide aggregate: Island County administers zoning in unincorporated areas, while incorporated cities and towns may administer their own land-use regulations.
      “Description: Show the zoning boundaries of unincorporated Island County. The zoning definitions are found in Title 17 of the Island County Municipal Code.”
    • Present (with conditions) — Zoning boundaries and Title 17 zoning definitions administered by Island County in unincorporated Island County.
      “Description: Show the zoning boundaries of unincorporated Island County. The zoning definitions are found in Title 17 of the Island County Municipal Code.”
  • Zoning districtsPartial

    Published county zoning categories and permitted housing zones identified by Island County.

    • The official housing page identifies several zones and directs readers to explanatory PDFs and a separate Freeland zoning code; it is not a complete countywide zoning map or district schedule.
    “This page provides links to explanatory PDFs that outline each housing type, what zone it is allowed, and provides a summary of the standards.”
  • SetbacksDistrict specific (with conditions)

    Development within Island County shoreline jurisdiction, including marine waters and specified freshwater lakes, classified by shoreline environment designation.

    • Shoreline jurisdiction extends to associated upland areas, including lands extending 200 feet from the ordinary high water mark and associated wetlands and floodplains.
    • The applicable shoreline environment designation determines the permitting and marine buffer/setback standards.
    • Additional county zoning, critical-area, floodplain, or other development standards may also apply.

    shoreline upland jurisdiction: 200 feet from ordinary high water mark (also includes associated wetlands and floodplains)

    “The Shoreline Master Program (SMP) is tailored to the unique ecosystems and development patterns of Island County. Shoreline uses are identified as either permitted, conditional, or prohibited uses depending on the shoreline environment designation (SED). Each SED has its own permitting and marine buffer/setback standards.”
  • Living in an RVLimited

    Temporary addition of a recreational vehicle to a residential property in Island County.

    • The county identifies the use as a Temporary Use Permit under ICC 17.03.180.
    • The temporary use requires no permanent improvements and is conducted for a limited duration.
    • The official page does not establish a general rule for long-term or permanent RV occupancy.

    duration: limited duration

    “A use specified in ICC 17.03.180 requiring no permanent improvements and conducted for a limited duration. [...] For temporary addition of Recreational Vehicle to a residential property.”
  • Manufactured homesAllowed (with conditions)

    Manufactured homes used as single-family dwellings in Island County.

    • Manufactured homes are permitted anywhere a single-family dwelling unit is permitted.
    • Manufactured-home parks are separately described as permitted on rural parcels of 10-20 acres.
    • Applicable building, land-use, utility, septic, and access requirements still apply.

    manufactured-home-park rural parcel size: 10-20 acres

    “Manufactured Homes: A single-family dwelling unit built to the HUD Manufactured Home Construction and Safety Standards Act. Permitted Zone: Anywhere a Single Family Dwelling Unit is Permitted.”
  • Accessory dwellingsAllowed (with conditions)

    Attached and detached accessory dwelling units in county-administered Island County zones.

    • Attached ADUs are identified as permitted in Rural, Rural Residential, Rural Agriculture, Rural Forest, and Commercial Agriculture zones.
    • Detached ADUs are identified as permitted in Rural, Rural Agriculture, Rural Forest, Commercial Agriculture, and Rural Residential zones.
    • Building and/or land-use permits remain required where applicable.
    “ADU attached: Separate living quarters contained within the primary residence. Permitted Zones: Rural, Rural Residential, Rural Agriculture, Rural Forest, and Commercial Agriculture. ADU detached: A detached accessory dwelling unit, situated on the same parcel as a single family dwelling. Permitted Zones: Rural, Rural Agriculture, Rural Forest, Commercial Agriculture, and Rural Residential.”
  • Who permits septicMixed (with conditions)

    On-site sewage systems in Island County.

    • Washington issued WAC 246-272A.
    • Local public health departments are required to enforce those regulations.
    “The state issued WAC 246-272A in 2005, with the intention that new septic maintenance requirements be enacted in 2007. Local public health departments are required to enforce these regulations.”
    One more reviewed finding on this topic
    • County (with conditions) — Island County Public Health's Onsite Sewage Program.
      “Our Onsite Sewage Program works to protect both public health and our natural environment by ensuring septic systems are properly designed, installed, and maintained to prevent contamination of our precious water resources.”
  • Septic permitRequired

    New construction and conforming or non-conforming repairs to onsite sewage systems in Island County.

    • The county publishes separate septic permit forms for new construction/conforming repairs and non-conforming repairs.
    • The building permit page requires an approved septic permit or as-built, or an applicable sewer district certificate, for single-family requirements.
    “New Construction/Conforming Repair Septic Permit”
  • Septic inspectionRequired

    Onsite sewage systems in Island County.

    • Conventional septic systems are inspected every three years.
    • Conventional pressure systems and alternative systems are inspected annually.
    • All systems are due for inspection at sale when no inspection occurred within the most recent compliance period.
    • Homeowner inspection is limited by system type and location; sensitive shellfish-protection watersheds require a licensed provider for non-conventional-gravity systems.

    conventional gravity inspection interval: 3 years · conventional pressure and alternative inspection interval: 1 year

    “On-site sewage systems shall be inspected in accordance with Island County Code, depending on the type of system. * Conventional septic systems (septic tank and drainfield only) – every 3 years * Conventional pressure systems (pump) – annually * Alternative systems (mounds, Glendons, ATUs, etc.) – annually * All systems will be due for an inspection at the time of sale, where the property is served by an on-site sewage system, and an inspection has not been completed within the most recent compliance period.”
  • Mandatory utility hookupConditional

    Development proposals requiring proof of water and sewage service or approved alternatives.

    • For a public water system, provide a letter from the water purveyor stating ability and intention to provide water.
    • For an individual well, provide proposal information sufficient to determine whether a public water system is required.
    • Provide an approved site registration, approved septic permit or as-built, or a public sewer letter stating intent to serve.
    “All proposals must demonstrate the capability of providing an approved means of sewage disposal. The application must include either an approved Site Registration that shows adequate soils in the area of the proposed sewage system, an approved septic permit or As-built, or a letter from the public sewer stating the intention to serve the proposal.”
    2 more reviewed findings on this topic
    • Conditional — Water and wastewater utility documentation for Island County building permits.
      “Approved Septic Permit / As Built or Applicable Sewer District Connection Certificate * Approved WAV (Water Availability Verification Form)”
    • Conditional — Single-family building permit submissions handled by Island County in unincorporated Island County.
      “Approved Septic Permit/As Built or Applicable Sewer District Connection Cert. Approved Water Availability Verification (WAV) Form”
  • Agricultural exemptionConditional

    Existing and ongoing agriculture in Island County critical areas.

    • The cited exemption is ICC 17.02B.300(B)(1).
    • The county page specifies agriculture in existence as of October 1, 1998.

    existing agricultural activity date: October 1, 1998

    “exemption ICC 17.02B.300(B)(1) – Existing and Ongoing Agriculture (in existence as of October 1, 1998).”
  • Subdividing landRegulated (with conditions)

    Subdivision and platting in unincorporated Island County.

    • Long plats, short plats, and related land divisions use county applications and are subject to county code requirements.
    • Smaller divisions of large lots must use preliminary and final subdivision processes.
    “For the division of land into five (5) or more lots”
  • Driveway accessRequired

    Building permit applications requiring access to a county or state highway.

    • An approved access permit is issued by Island County Public Works for a county-road driveway, or by the Washington State Department of Transportation when the first access is onto a highway.
    • The application must include an aerial photo or plot plan showing the approved access point or driveway and applicable easements.
    “To submit a building permit in Island County, a site registration and septic design, along with approved access permit, address, and water availability verification will be required starting March 1, 2024. Septic Design must be completed by a qualified septic designer and submitted to Health for review. Permits without these items will not be accepted for submittal.”
    One more reviewed finding on this topic
    • Required — Access and driveway approval for Island County building-permit submittals.
      “Approved Access Permit Issued by Public Works 360-679-7331 approving the driveway onto a County road, OR Department of Transportation 360-757-5964 or 360-848-7230. When it is the first access onto the HWY.”
  • Building in a floodplainRequired

    Development in an Island County floodplain.

    • A Flood Development Permit is required when applicable to a parcel within a floodplain.
    • As of June 2021, a pre-application conference is required before submitting a Flood Development Permit.
    • If the parcel is also within the flood zone, FEMA habitat-assessment requirements may be reviewed by the Floodplain Administrator.

    shoreline distance: <= 200 feet from Ordinary High Water Mark (shoreline approval may be required)

    “Flood Development Permit Approval (if within floodplain) As issued by the Island County Planning and Community Development Department As of June 2021, a Pre-Application Conference is required prior to submitting a Flood Development Permit; Please call 360-679-7339 to schedule a Flood Development Permit Pre-Application meeting.”
    One more reviewed finding on this topic
    • Required — Development within an Island County floodplain.
      “Flood Development Permit Approval (if within floodplain) | As issued by the Island County Planning and Community Development Department As of June 2021, a Pre-Application Conference is required prior to submitting a Flood Development Permit; Please call 360-679-7339 to schedule a Flood Development Permit Pre-Application meeting.”
  • Permit feesPublished (with conditions)

    Island County land-use and building permit fee schedules.

    • The county states that fee schedules were amended effective January 15, 2026.
    • Building permit fee estimates are not necessarily the amount due at submittal.

    fee schedule effective date: 2026-01-15 (Per Resolution C-65-25)

    “Per Resolution C-65-25, approved by the Island County Board of Commissioners on October 21, 2025, the Island County Land Use Fee Schedule and Building Fee Schedules will be amended effective Jan. 15, 2026.”
    One more reviewed finding on this topic
    • Published (with conditions) — Island County land-use and building permit fee information.
      “For information about permit fees, download Island County's land use permit fee schedule (pdf)”
  • Permit processPublished (with conditions)

    Island County land-use permit applications.

    • Electronic submissions may be sent to PlanningDept@islandcountywa.gov.
    • Attachments larger than 7MB will not be delivered by email.
    • After review, the planner advises the applicant of completeness, fees, and required hard copies.
    • In-person submittals require a scheduled appointment.
    “Once a planner is assigned to look over your submittal, they will let you know they have received your application and advise you of its completeness. If everything looks ready, the planner will provide you with an estimate of the fees and let you know how many hard copies are needed.”
    One more reviewed finding on this topic
    • Published (with conditions) — Island County building and land-use permit application processes.
      “Building Permit Submittal Requirements General Requirements * (2) Completed Building Permit Application (in ink with size 8 font minimum) * (2) Two sets/copies of Building Plans (to scale) * (2) Two sets/copies of Engineering and / or Structural Plans, if applicable * Completed Washington State Energy Code Worksheet * Plot Plan, no larger than 11 inches by 17 inches and to a standard engineering scale”

Washington rules that apply here

  • Owner-builder exemptionConditional

    An owner or other person performing construction-related contractor activities on the person's own property or personal residence under Washington contractor-registration law.

    • The exemption concerns registration provisions under chapter 18.27 RCW and does not itself eliminate applicable building, electrical, plumbing, mechanical, land-use, or inspection requirements.
    • For work on the person's own property, the exemption does not apply when the person performs contractor activities for the purpose of selling, demolishing, or leasing the property.
    • For an owner contracting with a registered contractor, the exemption does not apply to a person performing contractor activities to lease or sell improved property owned for less than twelve months.

    small-project contract threshold: < 500 USD (The threshold exemption does not apply when the work is part of a larger operation, contracts are divided to evade the chapter, or the person advertises as a contractor.)

    “The registration provisions of this chapter do not apply to: [...] (12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
    One more reviewed finding on this topic
    • Available (with conditions) — A person working on their own property or personal residence under Washington contractor-registration law.
      “(12) Any person working on his or her own property, whether occupied by him or her or not, and any person working on his or her personal residence, whether owned by him or her or not but this exemption shall not apply to any person who performs the activities of a contractor on his or her own property for the purpose of selling, demolishing, or leasing the property;”
  • Building code adoptedAdopted (with conditions)

    The Washington State Building Code applies in all Washington counties and cities and includes the model codes adopted by reference in RCW 19.27.031, as amended by the Washington State Building Code Council.

    • The adoption is subject to exceptions stated in chapter 19.27 RCW and amendments adopted by the Washington State Building Code Council.
    • The 2021 International Building Code, including Appendix E, is adopted by reference with the exceptions noted in Title 51 WAC.
    • The Uniform Plumbing Code provisions affecting sewers or fuel gas piping are not adopted.
    • Only the portions of the International Wildland Urban Interface Code specifically referenced in RCW 19.27.560 are adopted.
    • The state building code is enforced by counties and cities; a county or city without a building department must contract with another county, city, or approved inspection agency.
    • The model codes are adopted or amended through a three-year state building code adoption cycle, subject to statutory interim, emergency, and legislative off-cycle amendments.

    International Building Code edition: 2021 (Including Appendix E; subject to exceptions in Title 51 WAC) · effective date of current WAC 51-50-003 adoption: 2024-03-15

    “there shall be in effect in all counties and cities the state building code [...] which are hereby adopted by reference:”
    2 more reviewed findings on this topic
    • Adopted — Washington State Building Code as applicable in Island County.
      “(1) Except as otherwise provided in this chapter, there shall be in effect in all counties and cities the state building code which shall consist of the following model codes which are hereby adopted by reference:”
    • Adopted — The Washington State Building Code applies in all Washington counties and cities, including residential construction in unincorporated county areas.
      “there shall be in effect in all counties and cities the state building code [...] The International Residential Code”
  • Minimum dwelling sizeSpecified

    Dwelling units regulated by Washington's state building code.

    • The rule specifies habitable-space and room-area minimums, not a zoning minimum lot or gross floor-area standard.
    • Kitchens are expressly excepted from the minimum floor-area requirement.
    • Efficiency dwelling units must comply with Sections 1208.1 through 1208.4 and must have a separate closet, required kitchen facilities, light and ventilation, and a separate bathroom as stated in the source.
    • The current rule text states WSR 23-23-102 was filed 11/15/23 and effective 3/16/24.

    minimum habitable space: >= 190 square feet · minimum area of at least one room: >= 120 square feet · minimum net floor area of sleeping units and other habitable rooms: >= 70 square feet (Kitchens are not required to be of a minimum floor area.)

    “1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m 2) of habitable space. 1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m 2) of net floor area. Sleeping units and other habitable rooms of a dwelling unit shall have a net floor area of not less than 70 square feet (6.5 m 2). EXCEPTION: Kitchens are not required to be of a minimum floor area.”
  • Building heightSpecified

    Buildings subject to Washington's state building code, with allowable height determined by occupancy classification and type of construction.

    • Table 504.3 is occupancy- and construction-type-specific.
    • The source states that Chapters 4 and 5 contain specific exceptions to the allowable height.
    • The table includes NS and UL entries; the source footnotes state that NS is only for evaluation of existing building height under the International Existing Building Code and that other entries have sprinkler-related conditions.

    allowable building height: occupancy-classification and construction-type specific values in Table 504.3 feet above grade plane (See Chapters 4 and 5 for specific exceptions.)

    “Allowable Building Height in Feet Above Grade Plane”
  • Tiny homesAllowed (with conditions)

    Occupancy and placement of tiny houses in Washington

    • A tiny house may be built on wheels and may not exceed 400 square feet including kitchen, bathroom, and sleeping/living area.
    • It must be built to the Washington State Building Code.
    • Approval depends on where it is built; local building-department requirements and permits apply to foundation, installation, and location.
    • A wheeled structure that is not a tiny house as described may instead be a recreational vehicle or park model.
    • A manufactured home, including a tiny manufactured home, requires consultation with the local building department regarding where it may be located.

    maximum area: <= 400 square feet

    “A tiny house is a dwelling that may be built on wheels and is no larger than 400 square feet, including a kitchen, bathroom, and sleeping/living area, and must be built to the Washington State Building Code. The approval process for a tiny house depends on where it's built.”
  • Well permitLimited

    Groundwater wells and groundwater uses statewide under Washington's water-right permit exemption.

    • Domestic use is exempt up to 5,000 gallons per day.
    • Industrial use is exempt up to 5,000 gallons per day.
    • Lawn or garden irrigation is exempt only for a half-acre or less.
    • Stockwater is exempt.
    • Only one permit-exempt use of each type is allowed for any one project, regardless of project size.
    • Withdrawals from multiple wells for one project are aggregated toward the exemption limits.
    • Local governments and other laws and rules may impose additional requirements and limits.
    • Use in excess of the listed amounts, use for other purposes, or use from a surface-water source requires applying for and receiving a water-right permit.
    • Before drilling, a notice of intent must be submitted to Ecology 72 hours before drilling starts; the NOI is not itself a permit or approval to use water.
    • Permit-exempt uses remain subject to state water law, including possible restrictions relating to senior water rights and Streamflow Restoration Act requirements.

    domestic groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · industrial groundwater use exemption: <= 5000 gallons per day (Per project, with withdrawals from multiple wells aggregated.) · lawn or garden irrigation exemption: <= 0.5 acre (For lawn or garden irrigation.) · well construction notice: 72 hours before drilling (Notice of intent is not a permit, certificate, or water-right application.)

    “The groundwater permit exemption allows for four small uses of groundwater without a water right permit: Domestic uses of up to 5,000 gallons per day Industrial uses of up to 5,000 gallons per day Irrigation of a lawn or garden, a half-acre or less in size Stockwater”
    One more reviewed finding on this topic
    • Limited — Well drilling and well-site approval affecting Island County.
      “Well drilling is under the jurisdiction of the Washington State Department of Ecology (ECY).”
  • Campground & park staysLimited

    Recreational vehicles in the context of Washington's manufactured/mobile-home community statutes

    • The rule defines an RV as temporary and transient living quarters.
    • The RV is not occupied as a primary residence.
    • The RV is not immobilized or permanently affixed to a manufactured/mobile home lot.
    • This claim does not establish general statewide siting permission on private land; local land-use and building rules may apply.
    “(12) "Recreational vehicle" means a travel trailer, motor home, truck camper, or camping trailer that is primarily designed and used as temporary living quarters, is either self-propelled or mounted on or drawn by another vehicle, is transient, is not occupied as a primary residence, and is not immobilized or permanently affixed to a manufactured/mobile home lot.”
    One more reviewed finding on this topic
    • Limited — Camping and temporary occupancy in Washington State Parks facilities
      “The maximum length of stay shall be no more than 10 nights in one park within a 30-day period. Total nights stayed by the same camping party must not exceed 90 nights per calendar year in all state parks. These limitations shall not apply to those individuals who meet the qualifications of WAC 352-32-280 and 352-32-285.”
  • county zoning authorityGeneral

    Washington counties adopting zoning and related official controls for county jurisdiction, including unincorporated areas.

    • A county must create a planning agency as authorized in RCW 36.70.030 and RCW 36.70.040 before engaging in the chapter's planning program.
    • Zoning maps may be adopted only for areas covered by a comprehensive plan containing at least a land use element and a circulation element.
    • Zoning regulations may address land uses, building location and dimensions, yards and open spaces, population density, lot coverage, parking, and minimum gross floor area requirements for single-family detached dwellings.
    • The cited enabling provisions do not state a population threshold, named-county limitation, or special geographic limitation.
    “Any board, by ordinance, may establish classifications, within each of which, specific controls are identified, and which will regulate:”
    One more reviewed finding on this topic
    • General — Washington counties may plan and adopt zoning and other official controls for county land, including unincorporated areas, through their boards and planning agencies.
      “Such official controls may include, but are not limited to, ordinances establishing zoning, subdivision control, platting, and adoption of detailed maps.”
  • county building authorityGeneral

    Washington counties requiring and enforcing building permits and adopting amendments to the state building code for residential construction within county jurisdiction, including unincorporated areas.

    • The state building code must be enforced by counties and cities within their jurisdictional boundaries.
    • A county without a building department must contract with another county, city, or approved inspection agency for enforcement.
    • County amendments may not diminish the minimum performance standards and objectives of the state building code.
    • Residential-building amendments are subject to approval by the state building code council under RCW 19.27.074(1)(b), except as provided by statute.
    • The building-permit definition incorporates exemptions in International Building Code section 105.2 and International Residential Code section R105.2.
    • Counties may adopt permit exemptions for certain specified R-3 or M-1 construction or alteration with total fair market value not exceeding $1,500, but the exemption does not remove substantive code standards.

    permit-exemption fair-market-value ceiling: <= 1500 USD (Applies only to certain construction or alteration of group R, division 3, or group M, division 1 occupancies under RCW 19.27.060(7); substantive code standards still apply.)

    “The state building code required by this chapter shall be enforced by the counties and cities. Any county or city not having a building department shall contract with another county, city, or inspection agency approved by the county or city for enforcement of the state building code within its jurisdictional boundaries.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Certificate of occupancy — Certificate-of-occupancy requirements in Island County.
  • Minimum lot size — Minimum lot-size requirements for Island County parcels and development.
  • Lot coverage — Lot coverage in Island County.
  • Camping on your land — Temporary camping on private land in Island County.
  • Off-grid sanitation — Off-grid sanitation in Island County.
1 more unanswered
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Island County, Washington

Is Island County a good place to live off-grid or homestead?

Island County scores 59/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals and workable self-sufficiency basics: 27.6″/yr rainfall and 35.6% wooded land. Watch-outs: higher long-term carry cost and about 51,703 people within a 30-minute drive.

Do you need a building permit in Island County, Washington?

Island County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Island County Public Health - Environmental Health (Onsite Sewage Program). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Island County?

Living in an RV on your own land in Island County is limited to specific cases: Temporary addition of a recreational vehicle to a residential property in Island County. The county identifies the use as a Temporary Use Permit under ICC 17.03.180. The temporary use requires no permanent improvements and is conducted for a limited duration. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Island County, Washington?

Land in Island County runs about $16,100 per acre, based on the latest county data.

What is the water situation in Island County?

Island County gets about 27.6" of rain a year, with severe drought in roughly 2.7% of years.

How remote is Island County?

A representative private-land location has about 51,703 people within a 30-minute drive and 3,239,675 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Island compares in Washington

Compare side-by-side →See all 39 Washington counties ranked →