Base Zones

Information
Find the allowed uses and development standards for your zone. Get information about base zones and development standards.
A map showing the following base zones: R5a, OSc, and OSp. Text notes that upper case letters and numbers represent base zones.
Base zones are shown as a combination of capital letters and numbers on a zoning map. 

Base zones state two purposes:

  1. What uses are allowed on the property
  2. The required development standards that apply (such as maximum height and required setbacks)

There are five categories of base zones:

  1. Single-dwelling residential zones
  2. Multi-dwelling residential zones
  3. Commercial or mixed use zones
  4. Employment and industrial zones
  5. Campus institutional zones

How the property is used

A “use” is essentially how the property is used. Some uses are allowed by right, while other uses are limited or require a conditional use review. Finally, some uses are prohibited and are not allowed in the zone at all.

To determine in what zones a specific use may be located, you must first determine what land use category it is in. Use Chapter 33.920, Descriptions of the Use Categories, to classify the specific use.

For example, a clothing store is classified as a retail sales and service use and a dry cleaning shop is classified as an industrial services use.

Once you have determined the appropriate use category, review the primary use tables in the Use Categories handout or in the below base zone links to see the status of that category to determine whether the use is allowed, limited, conditional or prohibited.

If the proposed use is allowed by the base zone, you will also need to find out if the site is subject to additional uses from an Overlay ZonePlan District, or Additional Use and Development Regulations.

Development standards

Development standards are set by the zone.

Development standards regulate the

  • size
  • bulk
  • location of development on a site

Development standards can include maximum allowed height, setbacks and allowed density.

First, find the zoning on your property. To learn how, visit Find Zoning Regulations and Zoning Maps.

To find the allowed uses and development standards for your zone, review the applicable zoning code chapter and the development standards tables or documents.

Search by zone type:

Single Dwelling Zones (RF, R20, R10, R7, R5, R2.5)

Table 110-4: Summary of Development Standards in Single Dwelling Zones
StandardRFR20R10R7R5R2.5
Maximum FAR

(See 33.110.210 and 33.110.265)

1 total dwelling unit [1]

no limit0.4 to 10.4 to 10.4 to 10.5 to 10.7 to 1

2 total dwelling units [2]

0.5 to 10.5 to 10.5 to 10.6 to 10.8 to 1

3 total dwelling units [2]

0.6 to 1 [3]0.6 to 1 [3]0.6 to 1 [3]0.7 to 1 [3]0.9 to 1 [3]

4 or more total dwelling units

0.7 to 1 [3]0.7 to 1 [3]0.7 to 1 [3]0.8 to 1 [3]1 to 1 [3]
Maximum FAR with Bonus

(See 33.110.210 and 33.110.265)

1 total dwelling unit

NA0.4 to 10.4 to 10.4 to 10.5 to 10.7 to 1

2 total dwelling units [2]

0.6 to 10.6 to 10.6 to 10.7 to 10.9 to 1

3 total dwelling units [2]

0.7 to 10.7 to 10.7 to 10.8 to 11 to 1

4 or more total dwelling units

0.8 to 1 [3]0.8 to 1 [3]0.8 to 1 [3]0.9 to 1 [3]1.1 to 1 [3]
Maximum Height

(See 33.110.215 and 33.110.260)

30 ft.30 ft. [3]30 ft. [3]30 ft. [3]30 ft. [3]35 ft.
Minimum Setbacks

(See 33.110.220)

Front building setback

20 ft.20 ft.20 ft.15 ft.10 ft.10 ft.

Side building setback

10 ft.10 ft.10 ft.5 ft.5 ft.5 ft.

Rear building setback

10 ft.10 ft.10 ft.5 ft.5 ft.5 ft.

Garage entrance setback

18 ft.18 ft.18 ft.18 ft.18 ft.18 ft.
Maximum Building Coverage

(See 33.110.225)

See Table 110-5See Table 110-5See Table 110-5See Table 110-5See Table 110-5See Table 110-5
Required Outdoor Area

(See 33.110.240)

Minimum area

250 sq. ft.250 sq. ft.250 sq. ft.250 sq. ft.250 sq. ft.200 sq. ft.

Minimum dimension

12 ft. x 12 ft.12 ft. x 12 ft.12 ft. x 12 ft.12 ft. x 12 ft.12 ft. x 12 ft.10 ft. x 10 ft.

[1] Including any site with a congregate housing facility.

[2] Including accessory dwelling units.

[3] Additional FAR and height may be allowed. See 33.110.265.F.

Please note: The information listed above is not a complete list of standards. For all regulations that apply to your site, please review the Zoning Map at PortlandMaps.com and the Zoning Code chapters. Refer to the Zoning Code section listed next to the standard for additional information. These standards may be superseded by the regulations of an overlay zone or plan district.

Multi-Dwelling Zones- (RM1, RM2, RM3, RM4, RX, RMP)

Table 120-3: Summary of the Development Standards in the Multi-Dwelling Zones: 

Commercial / Mixed Use Zones - (CR, CM1, CM2, CM3, CE, and CX)

  • Generally developed with commercial uses. Some of the zones encourage commercial areas that serve the surrounding neighborhoods, while other zones serve a larger, often regional, market.
  • Zoning Code Chapter 33.130 Commercial Mixed Use Zones

Table 130-2: Summary of the Development Standards in the Commercial Zones: 

Employment and Industrial Zones - (EG1, EG2, EX, IG1, IG2, and IH)

Table 140-3: Summary of the Development Standards in the Employment and Industrial Zones: 

Campus Institutional Zones - (IR, CI1, CI2)

Table 150-2: Summary of the Development Standards in the Campus Institutional Zones:

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