18.2.5.030 Unified Standards for Residential Zones
A. Standards for Urban Residential Zones. Table 18.2.5.030.A contains standards for the R-1, R-1-3.5, R-2, and R-3 zones. Standards for the RR and WR zones are contained in subsections 18.2.5.030.B and 18.2.5.030.C.
Standard |
R-1 |
R-2 |
R-3 |
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R-1-10 |
R-1-7.5 |
R-1-5 |
R-1-3.5 |
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Residential Density (dwelling units/acre) |
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- Minimum |
NA |
NA |
NA |
NA |
See density standards in Sec. 18.2.5.080 |
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- Maximum |
Per Min. Lot Area |
Per Min. Lot Area |
Per Min. Lot Area |
Per Min. Lot Area |
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See also Sec. 18.2.5.080, for R-2 and R-3 zones |
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Lot Area – Minimum (square feet) |
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- Lot |
10,000 sf |
7,500 sf |
5,000 sf, 6,000 sf for corner lots |
5,000 sf1 |
See density standards in Sec. 18.2.5.080 |
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1Exception providing for minimum lot area of 3,500 sf in R-1-3.5 zone applies only where the lot contains an existing single-family dwelling that meets setback, density, and lot coverage standards; variances under this section are subject to Type I procedure. |
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Lot Width – Minimum (feet) |
75 ft2 |
65 ft2 |
50 ft2 |
50 ft2 |
50 ft |
50 ft |
2Width shall not exceed depth |
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Lot Depth (feet) |
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- Minimum |
80 ft |
80 ft |
80 ft |
80 ft |
80 ft |
80 ft |
- Maximum3 |
150 ft |
150 ft |
150 ft |
250% of width |
250% of width |
250% of width |
3Does not apply to Partitions |
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Standard Yards – Minimum4 (feet) |
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- Front – Standard, except: |
15 ft |
15 ft |
15 ft |
15 ft |
15 ft |
15 ft |
- Front – Unenclosed Porch5 |
8 ft |
8 ft |
8 ft |
8 ft |
8 ft |
8 ft |
- Front – Garage Opening |
20 ft |
20 ft |
20 ft |
20 ft |
20 ft |
20 ft |
- Side – Standard |
6 ft |
6 ft |
6 ft |
6 ft |
6 ft |
6 ft |
- Side – Corner Lot Adjacent to Street |
10 ft |
10 ft |
10 ft |
10 ft |
10 ft |
10 ft |
- Rear – Single-Story Building |
10 ft |
10 ft |
10 ft |
10 ft |
10 ft |
10 ft |
- Rear – Multi-Story Building |
10 ft per bldg story, 5 ft per half story |
10 ft per bldg story, 5 ft per half story |
10 ft per bldg story, 5 ft per half story |
10 ft per bldg story, 5 ft per half story |
10 ft per bldg story, 5 ft per half story |
10 ft per bldg story, 5 ft per half story |
4See sections 18.2.4.050 and 18.2.5.060 for yard exceptions, and 18.2.5.040 for accessory structure setback exceptions; additional setbacks may be required to avoid easement encroachments, and to comply with solar access requirements in chapter 18.4.8. |
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5 For setback, or the width of any existing public utility easement, whichever is greater; an unenclosed porch must be no less than 6 feet in depth and 8 feet in width, see section 18.6.1.030 for definition of porch; in the Historic District Overlay unenclosed porch provisions do not apply, and the minimum front yard is 20 ft. |
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6Does not apply to a side yard adjacent to an alley. |
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Building Separation, On Same Site – Minimum |
NA7 |
NA7 |
NA7 |
NA7 |
½ the height of the tallest building, where building height is measured at the two closest exterior walls; maximum separation required is 12 ft8 (see Figure 18.3.9.070.B) |
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7Except as required under chapter 18.3.9, Performance Standards Option and PSO Overlay. |
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8Except as required by building code; accessory structures, accessory residential units, and duplexes are exempt from this requirement and subject to applicable building code requirements. |
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Building Height – Maximum9 (feet) |
35 ft or 2 ½ stories, whichever is less, except structures within Historic District Overlay shall not exceed 30 ft |
35 ft or 2 ½ stories, except up to 50 ft with CU permit approval |
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9See figure in the definition of “height of building” in section 18.6.1.030. |
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Lot Coverage – Maximum10 (% of lot area) |
40% |
45% |
50% |
55% |
65% |
75% |
10A total area up to 200 sf or 5% of the permitted lot coverage, whichever is less, may be developed in an approved, porous solid surface that allows storm water infiltration, and is exempt from the lot coverage maximum; the porous solid surface exemption does not apply to driveways and parking areas. Within cottage housing developments up to 10% of the permitted lot coverage may be developed in an approved, porous solid surface that allows storm water infiltration, and is exempt from the lot coverage maximum. |
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Landscape Area – Minimum (% of developed lot area) |
60% |
55% |
50% |
45% |
35% |
25% |
Open Space – Minimum (% of site area)11 |
NA |
NA |
NA |
NA |
8% |
8% |
11See chapter 18.3.9 for additional common open space requirements in Performance Standard Options developments. |
B. Woodland Residential Zone. Standards for the Woodland Residential (WR) zone follow:
Minimum Lot Area and Maximum Density |
Slope |
Min. Lot Size |
DU/Acre |
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Limits on density transfer. All developments, with the exception of partitioning, must be developed under the Performance Standards Option, chapter 18.3.9. Not more than 25% of the density allowed in a WR zone may be transferred to a higher density zone in a Performance Standard Options development. |
Less than 40% |
2 |
0.5 |
40 to 50% |
2.5 |
0.4 |
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50 to 60% |
5 |
0.2 |
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Over 60% |
10 |
0.1 |
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Outside UGB |
20 |
0.05 |
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Lot Coverage – Maximum1 (% of lot area) |
7% |
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1A total area up to 200 sf or 5% of the permitted lot coverage, whichever is less, may be developed in an approved, porous solid surface that allows storm water infiltration, and is exempt from the lot coverage maximum; the porous solid surface exemption does not apply to driveways and parking areas. |
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Lot Width – Minimum (feet) |
100 ft |
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Lot Depth – Minimum and Maximum (feet) |
150 ft |
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Standard Yards – Minimum2 (feet) |
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- Front – Standard |
20 ft |
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- Side – Standard, except: |
6 ft |
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- Side – Corner-Street/Alley Side |
10 ft |
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- Rear – Single-Story Building |
10 ft |
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- Rear – Multi-Story Building |
10 ft per bldg story |
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2See sections 18.2.4.050 and 18.2.5.060 for yard exceptions, and 18.2.5.040 for accessory structure setback exceptions; additional setbacks may be required to avoid easement encroachments, and to comply with solar access requirements in chapter 18.4.8. |
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Maximum Building Height |
35 ft or 2 ½ stories, whichever is less. |
C. Rural Residential Zone. Standards for the Rural Residential (RR) zone follow:
Minimum Lot Area and Maximum Density1 |
Zone |
Min. Lot Size1 |
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See also Section 18.2.5.080, Residential Density. |
RR-.5 |
0.5 acre |
RR-1 |
1 acre |
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RR-2.5 |
2.5 acres |
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1The minimum lot size depends on the topographic nature, service availability, surrounding land uses, and other relevant characteristics of the area. |
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Lot Coverage – Maximum (% of lot area)2 |
Lot Type |
Lot Coverage |
RR-.5 |
20% |
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RR-1 |
12% |
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RR-2.5 |
7% |
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2A total area up to 200 sf or 5% of the permitted lot coverage, whichever is less, may be developed in an approved, porous solid surface that allows storm water infiltration, and is exempt from the lot coverage maximum; the porous solid surface exemption does not apply to driveways and parking areas. |
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Lot Width – Minimum (feet) |
100 ft |
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Lot Depth – Minimum and Maximum (feet) |
150 ft and not more than 300% of width |
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Standard Yards – Minimum3 (feet) |
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- Front – Standard |
20 ft |
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- Side – Standard, except: |
6 ft |
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- Side – Corner-Street/Alley Side |
10 ft |
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- Rear – Single-Story Building |
10 ft |
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- Rear – Multi-Story Building |
10 ft per bldg story |
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3See sections 18.2.4.050 and 18.2.5.060 for yard exceptions, and 18.2.5.040 for accessory structure setback exceptions; additional setbacks may be required to avoid easement encroachments, and to comply with solar access requirements in chapter 18.4.8. |
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Maximum Building Height |
35 ft or 2 ½ stories, whichever is less; except the height of agricultural structures is not limited, when the structure is placed 50 feet or more from all property lines. |
(Ord. 3199 § 7, amended, 06/15/2021; Ord. 3191 § 7, amended, 11/17/2020; Ord. 3147 § 3, amended, 11/21/2017)