Zoning, building permits and septic rules in Tukwila, Washington

Tukwila’s own rules

• Building permitLimited

  Building work inside Tukwila city limits.

  • One-story detached accessory tool/storage structures, playhouses, and similar uses are exempt only if floor area does not exceed 120 square feet and the structure is outside of and entirely separated from any existing building on the premises.
  • Fences not over 6 feet high are exempt.

  accessory-structure exemption maximum floor area: <= 120 square feet (Must be outside of and entirely separated from an existing building on the premises.) · fence exemption maximum height: <= 6 feet

  “One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area does not exceed 120 square feet, and such structure is outside of and entirely separated, as prescribed by Code, from any existing building on the premises.”

• Building code adoptedAdopted (with conditions)

  Buildings and construction inside Tukwila city limits.

  • The listed model-code editions become effective on the date established by the State Building Code Council.
  • The City code identifies local amendments and statewide amendments.

  International Residential Code edition: 2021 (with statewide amendments) · Washington State Energy Code edition: 2021

  “Effective on the date established by the State Building Code Council, the specified editions of the following model codes are adopted by reference as if fully set forth and as numerated in Chapter 19.27 RCW:”

• InspectionsLimited

  Demolition or removal work inside Tukwila city limits.

  • The cited inspection requirement applies after demolition or removal work is completed.

  “After the work is completed, an inspection will be required.”

• Local zoningPresent (with conditions)

  Land inside Tukwila city limits, including the Community Residential district.

  • Development remains subject to the applicable zoning district and its standards.

  “In order to classify, segregate and regulate the uses of land, buildings, and structures, the City is divided into the following use districts:”

• Zoning districtsPublished (with conditions)

  Land inside Tukwila city limits.

  • District applicability is determined by Tukwila's districts-established map and applicable zoning provisions.

  “The boundaries of the use districts as outlined in TMC Section 18.08.010 are shown on the official zoning map (Figure 18-10) which, together with all explanatory matters thereon, is hereby adopted by reference and declared to be a part of this title.”

• Mandatory utility hookupSewer (with conditions)

  Occupied buildings on lots or parcels inside Tukwila city limits that are within the area served by the City sanitary sewage disposal system.

  • Connection is required within 30 days after publication of the Mayor-and-City-Clerk-signed connection notice in a newspaper of general circulation within the City.
  • For a building not completed before notice publication, connection is required on or before completion and before use or occupancy.
  • Where multiple buildings are on a parcel no larger than 50 feet by 100 feet and can be served by one sanitary connection, one connection may serve all buildings.

  service-area distance from sanitary sewer line or lateral: <= 250 feet · connection deadline after notice publication: <= 30 days (Uncompleted buildings must connect on or before completion and before use or occupancy.)

  “All premises upon which any portion of any building is situated within 250 feet of a sanitary sewer line or lateral shall be deemed to be within the area served by said sanitary sewage system.”

• Subdividing landRegulated (with conditions)

  Short subdivisions of land inside Tukwila city limits.

  • Tukwila's code separately lists detailed procedures for long subdivisions and binding-site improvement plans.

  “Chapter 17.12 DETAILED PROCEDURES FOR SHORT SUBDIVISIONS (§ 17.12.010 – § 17.12.080)”

• Permit feesPublished (with conditions)

  Relocation investigation and a building permit for a relocated building inside Tukwila city limits.

  • The distance charge applies for every 10 miles, or increment, outside City limits.
  • If a building permit is issued for a relocated building, building-permit and plan-review fees are based on total value at the relocated site using the formula for new residential construction.

  relocation investigation base fee: 25 USD · additional distance fee: per 15 USD (For every 10 miles distance or increment thereof outside City limits.)

  “The fee for relocation investigation service shall be a $25 base fee, plus $15 for every 10 miles distance or increment thereof, outside the City limits.”

• Permit processPartial

  Sanitary side-sewer installation permit applications inside Tukwila city limits.

  • The owner must apply under TMC § 18.104.060.
  • Plans and specifications must show the full drain course, branches, traps, and fixtures.
  • The Director may modify the plans and specifies the connection manner, location, material, size, and grade.

  “In order to obtain the permit provided for in TMC Section 14.12.060, the owner shall file an application therefor with the Department pursuant to TMC Section 18.104.060, together with plans and specifications showing the whole course of the drain from the public sanitary sewer to its connection with the building or premises, and all branches, traps and fixtures to be connected therewith”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Tukwila or King County directly.

• Owner-builder exemption — Owner-built residential construction inside Tukwila city limits.
• Certificate of occupancy — Buildings inside Tukwila city limits.
• Minimum dwelling size — Dwellings inside Tukwila city limits.
• Living in an RV — RV occupancy on private land inside Tukwila city limits.
• Camping on your land — Temporary camping on private land inside Tukwila city limits.

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.

Off-grid gear

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

• Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
• Power Bluetti Solar generators and home battery backup for living off the grid.
• Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
• Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.

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