Zoning, building permits and septic rules in North Plains, Oregon

North Plains’s own rules

• Local zoningPresent (with conditions)

  Land inside the incorporated limits of North Plains city.

  • Zoning is administered through Chapter 155, Zoning and Development.

  “For the purposes of this chapter, the incorporated area of the city is hereby divided into the following zoning districts:”

• Zoning districtsPublished (with conditions)

  The incorporated area of North Plains city.

  • The listed districts are established for purposes of Chapter 155.

  “For the purposes of this chapter, the incorporated area of the city is hereby divided into the following zoning districts:”

• Minimum dwelling sizeSpecified

  Manufactured homes located inside North Plains city limits.

  • The provision applies to manufactured homes and requires multi-sectional construction; it does not establish a general minimum floor area for all site-built R-7.5 dwellings.

  manufactured-home enclosed space: >= 1000 square feet (A manufactured home shall not be considered multi-sectional by virtue of having a tip-out section.)

  “The manufactured home shall be multi-sectional (double wide or wider) and enclose a space of not less than 1,000 square feet.”

• Accessory dwellingsAllowed (with conditions)

  Accessory dwellings on residential lots inside North Plains city limits.

  • The structure must comply with the Oregon Structural Specialty Code.
  • It must be permanently built and connected to utilities similarly to the primary structure.
  • Only one accessory dwelling is allowed per lot.
  • Detached accessory dwellings may not exceed 25 feet in height.
  • The stated buffering and front-elevation location standards apply.

  accessory dwelling units per lot: <= 1 · detached accessory-dwelling height: <= 25 feet

  “One unit. A maximum of one accessory dwelling unit is allowed per lot;”

Rules another office applies inside North Plains

North Plains does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

• Minimum lot sizeSpecified

  All uses in North Plains R-7.5 Low Density Residential District.

  • The R-7.5 dimensional standards are subject to the modifications permitted under §§ 155.530 through 155.533 and §§ 155.610 through 155.614.

  minimum lot size: >= 7500 square feet (Lots in a subdivision may average a minimum lot size of 7,500 square feet.)

  “Lot/parcel size. All uses: 7,500 square feet minimum lot size (lots in a subdivision may average a minimum lot size of 7,500 square feet).”

• Lot coverageSpecified

  Lots in North Plains R-7.5 Low Density Residential District.

  • The R-7.5 dimensional standards are subject to the modifications identified in § 155.158.

  maximum impervious surface coverage: <= 65 percent

  “Lot/parcel coverage. The maximum impervious surface coverage shall not exceed 65% of the total area of any lot.”

• Building heightSpecified

  Buildings in North Plains R-7.5 Low Density Residential District.

  • The R-7.5 dimensional standards are subject to the modifications identified in § 155.158.
  • A lower maximum applies to accessory dwellings and accessory structures.

  building height measured from grade: <= 35 feet (Accessory dwellings and accessory structures shall not exceed 25 feet.) · accessory dwelling or accessory structure height: <= 25 feet

  “Height of buildings. Buildings shall not exceed a height, measured from grade, of 35 feet. Accessory dwellings and accessory structures shall not exceed 25 feet.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask North Plains or Washington County directly.

• Building permit — Residential building construction inside North Plains city limits.
• Owner-builder exemption — Owner-built residential construction inside North Plains city limits.
• Building code adopted — Building construction inside North Plains city limits.
• Inspections — Residential building inspections inside North Plains city limits.
• Certificate of occupancy — New or altered buildings inside North Plains 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 North Plains 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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