Zoning Code / Development

Portland Zoning Code

Title 33, Planning and Zoning (1/1/15)

33.110 Single-Dwelling Zones (active link)


33.110.010 Purpose
33.110.020 List of the Single-Dwelling Zones
33.110.030 Other Zoning Regulations

Use Regulations
33.110.100 Primary Uses
33.110.110 Accessory Uses
33.110.120 Nuisance-Related Impacts

Development Standards
33.110.200 Housing Types Allowed
33.110.212 When Primary Structures are Allowed
33.110.213 Additional Development Standards for Lots and Lots of Record Created Before July 26, 1979
33.110.215 Height
33.110.220 Setbacks
33.110.225 Building Coverage
33.110.227 Trees
33.110.230 Main Entrances in R10 through R2.5 Zones
33.110.232 Street-Facing Facades in R10 through R2.5 Zones
33.110.235 Required Outdoor Areas
33.110.240 Alternative Development Options
33.110.245 Institutional Development Standards
33.110.250 Accessory Structures
33.110.253 Garages
33.110.255 Fences
33.110.257 Retaining Walls
33.110.260 Demolitions
33.110.270 Nonconforming Development
33.110.275 Parking and Loading
33.110.280 Signs


33.110.010 Purpose

The single-dwelling zones are intended to preserve land for housing and to provide housing opportunities for individual households. The zones implement the comprehensive plan policies and designations for single-dwelling housing.

A. Use regulations. The use regulations are intended to create, maintain and promote single-dwelling neighborhoods. They allow for some non-household living uses but not to such an extent as to sacrifice the overall image and character of the single-dwelling neighborhood.

B. Development standards. The development standards preserve the character of neighborhoods by providing six different zones with different densities and development standards. The development standards work together to promote desirable residential areas by addressing aesthetically pleasing environments, safety, privacy, energy conservation, and recreational opportunities. The site development standards allow for flexibility of development while maintaining compatibility within the City’s various neighborhoods. In addition, the regulations provide certainty to property owners, developers, and neighbors about the limits of what is allowed. The development standards are generally written for houses on flat, regularly shaped lots. Other situations are addressed through special regulations or exceptions.

33.110.020 List of the Single-Dwelling Zones
The full names, short names, and map symbols of the single-dwelling residential zones are listed below. When this Title refers to the single-dwelling zones, it is referring to the six zones listed here. When this Title refers to the residential zones, or R zones, it is referring to both the single-dwelling zones in this chapter and the multi-dwelling zones in Chapter 33.120. The Residential Farm/Forest zone is intended to generally be an agricultural zone, but has been named Residential Farm/Forest to allow for ease of reference.

Full Name Short Name/Map Symbol

Residential Farm/Forest    RF
Residential 20,000              R20
Residential 10,000               R10
Residential 7,000                  R7
Residential 5,000                  R5
Residential 2,500                  R2.5

33.110.030 Other Zoning Regulations
The regulations in this chapter state the allowed uses and development standards for the base zones. Sites with overlay zones, plan districts, or designated historical landmarks are subject to additional regulations. The Official Zoning Maps indicate which sites are subject to these additional regulations. Specific uses or development types may also be subject to regulations in the 200s series of chapters.