Land Development Services

Temporarily located at 445 Port Avenue (the Port Business Center in St. Helens), our department is open for in-person services, including dropping off applications and picking up permits. Setting appointments with the Planning Division is recommended but not required.

Land Development Services is your best source of information related to land use, zoning, permitting, building construction, dividing land, and other general land development in unincorporated Columbia County. We provide technical assistance and information to help you take your project from idea to reality. 


The Planning Division is responsible for reviewing all development proposals within Columbia County's jurisdiction through the County's development ordinances. If you own property in Columbia County or are considering purchasing or developing property, contact us first and we will assist you in navigating the land use process by providing information related to zoning, environmental constraints (such as floodplain, wetlands, or other habitat areas), permitting, dividing land and general land development. Visit Planning →


The Building Division is entrusted with achieving compliance with applicable State laws and adopted building codes regarding building design and construction within unincorporated Columbia County and the City of Rainier. Building codes are in place to protect public health, safety, and general welfare as they relate to the construction and occupancy of buildings and structures. Our services include plan review, permitting, and inspections.  Visit Building →

Code Compliance and Enforcement

The Code Compliance and Enforcement Program is responsible for protecting health and safety by ensuring compliance with county regulations. Voluntary compliance is the program's core objective. Visit Code Compliance →

Technology Fee added to program fees (June 2022):
Land Development Services Quick Links
General Information
Phone Numbers
Fax: 503-366-3902
Emergencies: Dial 911
445 Port Avenue
St. Helens,

Monday - Friday
8:30 a.m. to 5:00
We are available by phone and email, or by appointment only.