Bolthole Index

Snohomish County, Washington

Zoning, building permits and septic rules in Town of Index, Washington

Town of Index is a town in Snohomish County, Washington. Town of Index adopts its own zoning, so inside its limits Town of Index’s rules apply, not the county’s. 6 rules below are quoted from official sources and independently re-checked, most recently on October 24, 2026. Rules for unincorporated land are on the Snohomish County page.

Answers from the rulebook for Town of Index

Town of Index’s own rules

  • Building code adoptedAdopted (with conditions)

    Buildings regulated by the Town of Index inside town limits.

    • The adoption is subject to modifications or amendments in Chapter 15.01.
    • The listed model codes incorporate specified Washington amendments and future Washington enactments and amendments.
    • Where adopted town codes conflict with State Building Code Council codes and regulations, State Building Code Council codes and regulations govern.

    International Building Code edition: 2021 (With Washington amendments and future state enactments and amendments.) · International Residential Code edition: 2021 (With Washington amendments and future state enactments and amendments.)

    “Pursuant to RCW 19.27.031, the following codes of technical regulations are adopted by this reference as if fully set forth, subject to the modifications or amendments set forth in this chapter:”
  • Local zoningPresent (with conditions)

    Land inside Index town limits.

    • Title 17 contains district classifications and development standards; parcel-specific district and permit requirements apply.
    “Title 17 Zoning [...] Residential uses are permitted throughout the town of Index and in combination with other land uses; provided, that the goals of the Index comprehensive plan are met.”
  • Zoning districtsPublished (with conditions)

    Land inside Index town limits.

    • The published code identifies a Neighborhood Residential Classification, Light Industrial Classification, and Commercial Zone Classification.
    “Chapter 17.16 NEIGHBORHOOD RESIDENTIAL CLASSIFICATION [...] Chapter 17.20 LIGHT INDUSTRIAL CLASSIFICATION [...] Chapter 17.24 COMMERCIAL ZONE CLASSIFICATION”
  • Subdividing landRegulated (with conditions)

    Subdivision proposals inside Index town limits.

    • Preliminary plat applications are subject to town-council review, including a public hearing and final decision.
    • Development permit applications must be submitted on town forms and include materials required by applicable development regulations.
    “The following development permits are subject to town council review, including a public hearing (unless otherwise noted) and final decision: [...] Preliminary plat applications.”
  • Permit feesVariable (with conditions)

    Development-project permit applications inside Index town limits.

    • A technically complete application includes the applicable fee.
    • The code defines the fee as processing cost, including administrative designees' professional-services costs.
    “The town council is authorized to adopt and establish a fee schedule by resolution for town costs in reviewing and processing all permit application covered by this chapter. In addition, all development permit applicants shall be responsible for reimbursing the town for its consultant costs in reviewing development permits as follows:”
  • Permit processPublished (with conditions)

    Development-project permits administered by Index inside town limits.

    • Applications are submitted to the town clerk at Index Town Hall.
    • The town has up to 28 days after submission to determine completeness and 14 days after resubmission if initially incomplete.
    • After a permit is deemed complete, the town has 120 days to issue a final decision, subject to stated tolling.
    • Applications require the applicable fee and materials required by applicable development regulations.

    initial completeness determination: <= 28 days (After development permit application submission.) · final decision: <= 120 days (After permit is deemed complete; may be tolled as stated in § 14.04.060(B).)

    “The town shall have a maximum of twenty-eight (28) days after a development permit application is submitted to determine whether it is complete. If it is deemed incomplete, the town shall have an additional fourteen (14) days upon resubmission to determine if the application is complete. After a permit is deemed complete, the town shall have one hundred twenty (120) days to issue a final decision.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Index or Snohomish County directly.

  • Building permit — Residential construction inside Index town limits.
  • Owner-builder exemption — Owner-built residences inside Index town limits.
  • Inspections — Residential building work inside Index town limits.
  • Certificate of occupancy — Residential occupancy inside Index town limits.
  • Minimum dwelling size — Dwellings in Index zoning districts.
19 more unanswered
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • 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.

Unanswered questions are usually a sign that Town of Index publishes no rule on the point, not that none exists. Snohomish County’s page lists the county offices to call.

Off-grid gear

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

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