Zoning, building permits and septic rules in St. Helens, Oregon

St. Helens’s own rules

• InspectionsRequired

  Each manufactured/mobile home placed in a manufactured/mobile home park inside St. Helens city limits.

  • The unit must meet the listed state-insignia, repair, sanitary-fixture, installation, and city manufactured-home standards.

  “Each manufactured/mobile home placed in a manufactured/mobile home park shall be inspected by the building official and shall meet the following standards:”

• Local zoningPresent (with conditions)

  Land inside St. Helens city limits.

  • Use and development remain subject to the applicable zoning district and Community Development Code requirements.

  “The establishment, location, and use of manufactured homes as scattered site residences shall be permitted in any zone permitting installation of a dwelling unit subject to requirements and limitations applying generally to such residential uses in the district, and provided such homes shall meet the following requirements and limitations:”

• Zoning districtsPublished (with conditions)

  Land inside St. Helens city limits.

  • The excerpt identifies residential zones; other city zones are listed in Chapter 17.32.

  “§ 17.32.050 Suburban residential zone – R-10. § 17.32.060 Moderate residential zone – R-7. § 17.32.070 General residential zone – R-5.”

• Minimum dwelling sizeSpecified

  Manufactured homes on individual building lots inside St. Helens city limits.

  • Applies to manufactured homes on individual building lots, not established as the general single-family dwelling-size rule.

  minimum enclosed space: >= 1000 square feet (Manufactured home must be multisectional.)

  “The manufactured home shall be multisectional and enclose a space of not less than 1,000 square feet;”

• Building heightSpecified

  Structures in manufactured/mobile home parks inside St. Helens city limits.

  • Applies to manufactured/mobile home parks; not established as the main single-family residential district height rule.

  maximum structure height: <= 25 feet (Manufactured/mobile home park.)

  “No structure shall exceed 25 feet in height.”

• Manufactured homesAllowed (with conditions)

  Manufactured homes as scattered-site residences in a city zoning district that permits a dwelling unit.

  • The home must meet the listed requirements and limitations.
  • It must be multisectional and enclose at least 1,000 square feet.
  • It must comply with foundation, anchoring, roof, exterior-material, thermal-envelope, and parking requirements.

  minimum enclosed space: >= 1000 square feet (Manufactured homes on individual building lots.)

  “The establishment, location, and use of manufactured homes as scattered site residences shall be permitted in any zone permitting installation of a dwelling unit subject to requirements and limitations applying generally to such residential uses in the district, and provided such homes shall meet the following requirements and limitations:”

• Subdividing landRegulated (with conditions)

  Land divisions and subdivisions inside St. Helens city limits.

  • Specific approval standards and procedures were not extracted from the chapter text.

  “Chapter 17.136 LAND DIVISION – SUBDIVISION”

• Driveway accessRequired

  Manufactured/mobile home parks inside St. Helens city limits.

  • Primary access must be from a public street and comply with Chapter 17.84.
  • Access driveways connecting units to a public street must be at least 36 feet wide, with at least 20 feet paved.

  access-driveway width: >= 36 feet (Of this width, at least 20 feet must be paved.)

  “Access driveways connecting units to a public street shall have a width of not less than 36 feet, of which not less than 20 feet shall be paved; and”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask St. Helens or Columbia County directly.

• Building permit — New residential construction inside St. Helens city limits.
• Owner-builder exemption — Owner-built residences inside St. Helens city limits.
• Building code adopted — Building construction inside St. Helens city limits.
• Certificate of occupancy — New residential construction inside St. Helens city limits.
• Lot coverage — Residential lots inside St. Helens 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 St. Helens 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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