Zoning, building permits and septic rules in Columbia City, Oregon

Columbia City’s own rules

• Local zoningPresent

  All land inside Columbia City city limits (Columbia County, OR)

  • Development Code consolidates zoning and related land-use rules; amended through Ordinance 25-740-O (3/23/25)

  “columbia city development code adopted june 10, 2003 - ordinance no. 03-586-o includes amendments through march 23, 2025”

• Zoning districtsPublished

  Zoning districts inside Columbia City city (R-1, R-2, R-3, MHP, commercial, CR, industrial, public land, etc.)

  • Zoning map is addressed in 7.30.030

  “r-1 low density residential zone 7.40.010 purpose 7.40.020 permitted uses 7.40.030 conditional uses”

• Minimum lot sizeSpecified

  R-1 Low Density Residential zone inside Columbia City city

  • Minimum lot width 85 feet and 45 feet of street access
  • Amended by Ordinance 25-740-O 3/23/25

  minimum lot area: >= 10000 square feet

  “the minimum lot area for all uses shall be ten thousand (10,000) square feet. [amended by ordinance no. 25-740-o 3/23/25] b. the minimum lot width shall be eighty-five (85) feet and each lot shall have a minimum of forty-five (45) feet of street access.”

  One more reviewed finding on this topic

  • Specified — R-2 Moderate Density Residential zone inside Columbia City city

    “the minimum lot area for all uses shall be ten thousand (10,000) square feet. lots created on or before may 17, 1978 may be five thousand (5,000) square feet.”

• SetbacksSpecified

  R-1 Low Density Residential zone inside Columbia City city

  • Side setbacks have exceptions (e.g. small accessory structures); garage/carport setbacks separately stated
  • Rear setback not captured

  front setback: >= 20 feet (10 feet adjacent to an 80-foot wide local street right of way) · side setback: >= 8 feet (exceptions for small accessory structures and street side)

  “the front setback for all structures shall be a minimum of twenty (20) feet, except the front setback adjacent to an eighty (80) foot wide local street, public right of way, shall be a minimum of ten (10) feet.”

• Lot coverageSpecified

  R-1 Low Density Residential zone inside Columbia City city (R-2 also 50%; R-3 70%; MHP 80% impervious)

  • Covers buildings, portable storage structures and paving

  maximum coverage: <= 50 percent of lot or parcel

  “g. buildings, portable storage structures and paving shall not occupy more than 50% of the”

• Building heightSpecified

  R-1 Low Density Residential zone inside Columbia City city (R-2, R-3, MHP and commercial also 24 ft; industrial 40 ft)

  • Height measured from defined building grade

  maximum building height: <= 24 feet

  “no building height in an r-1 zoning district shall exceed twenty-four (24) feet.”

• Living in an RVLimited

  Occupying a recreational vehicle as a residence inside Columbia City city

  • Unlawful unless specifically approved under chapter 7.110 temporary structures
  • Residentially zoned private property may house non-paying guests in an RV no more than 10 days per calendar year
  • In flood hazard overlay, RVs limited to 180 consecutive days and must be highway-ready

  guest RV days: <= 10 days per calendar year

  “it is unlawful for any recreational vehicle, to be occupied, lived in or otherwise used as a residence within the city, unless such use is specifically approved by the city under chapter 7.110, temporary structures, except a private, residentially zoned property is permitted to use a recreational vehicle to house non-paying guests no more than a total of ten (10) days in a calendar year.”

• Manufactured homesAllowed (with conditions)

  Manufactured homes on individual lots in R-1 (also R-2) inside Columbia City city; MHP zone for parks

  • Subject to section 7.94.030 standards
  • R-2 requires development standards for a single-family detached dwelling

  “c. manufactured homes on individual lots subject to section 7.94.030;”

• Accessory dwellingsLimited

  Attached or detached ADUs in R-1 (also R-2, R-3) inside Columbia City city

  • Ministerial review by planning director under chapter 7.112
  • One meter per utility and one address/mailbox serve both units
  • Only one front-facade entrance for attached ADUs unless pre-existing

  maximum ADU size: <= 750 square feet

  “k. attached or detached accessory dwelling units subject to chapter 7.112.”

• Short-term rentalsLimited

  Short-term vacation rental units inside Columbia City city

  • Chapter 7.95 sets review process, notice, business license and transient room tax, and standards; details not read

  “vacation rental units shall be allowed anywhere residential uses are allowed.”

Still unanswered

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

• Building permit — Building permits inside Columbia City city
• Owner-builder exemption — Owner-builder exemption inside Columbia City city
• Building code adopted — Building code inside Columbia City city
• Inspections — Building inspections inside Columbia City city
• Certificate of occupancy — Certificate of occupancy inside Columbia City city

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.