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.

Table 18.2.5.030.A. Standards for Urban Residential Zones¹

(Except as modified under chapter 18.5.5, Variances, or chapter 18.3.9, Performance Standards Option and PSO Overlay.)
Standard	R-1				R-2	R-3
Standard	R-1-10	R-1-7.5	R-1-5	R-1-3.5	R-2	R-3
Residential Density (dwelling units/acre)
- Minimum	NA	NA	NA	NA	See density standards in Sec. 18.2.5.080
- Maximum	Per Min. Lot Area	Per Min. Lot Area	Per Min. Lot Area	Per Min. Lot Area
See also Sec. 18.2.5.080, for R-2 and R-3 zones
Lot Area – Minimum (square feet)
- 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
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.
Lot Width – Minimum (feet)	75 ft²	65 ft²	50 ft²	50 ft²	50 ft	50 ft
²Width shall not exceed depth
Lot Depth (feet)
- 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
Standard Yards – Minimum⁴ (feet)
- 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.
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.
⁶Does not apply to a side yard adjacent to an alley.
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)
⁷Except as required under chapter 18.3.9, Performance Standards Option and PSO Overlay.
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.
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
⁹See figure in the definition of “height of building” in section 18.6.1.030.
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.
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:

Table 18.2.5.030.B. Standards for Woodland Residential (WR) Zone

(Except as modified under chapter 18.5.5, Variances, or chapter 18.3.9, Performance Standards Option and PSO Overlay.)
Minimum Lot Area and Maximum Density	Slope	Min. Lot Size	DU/Acre
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
	50 to 60%	5	0.2
	Over 60%	10	0.1
	Outside UGB	20	0.05
Lot Coverage – Maximum¹ (% of lot area)	7%
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.
Lot Width – Minimum (feet)	100 ft
Lot Depth – Minimum and Maximum (feet)	150 ft
Standard Yards – Minimum² (feet)
- Front – Standard	20 ft
- Side – Standard, except:	6 ft
- Side – Corner-Street/Alley Side	10 ft
- Rear – Single-Story Building	10 ft
- Rear – Multi-Story Building	10 ft per bldg story
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.
Maximum Building Height	35 ft or 2 ½ stories, whichever is less.

C. Rural Residential Zone. Standards for the Rural Residential (RR) zone follow:

Table 18.2.5.030.C. Standards for Rural Residential (RR) Zone

(Except as modified under chapter 18.5.5, Variances, or chapter 18.3.9, Performance Standards Option and PSO Overlay.)
Minimum Lot Area and Maximum Density¹	Zone	Min. Lot Size¹
See also Section 18.2.5.080, Residential Density.	RR-.5	0.5 acre
	RR-1	1 acre
	RR-2.5	2.5 acres
¹The minimum lot size depends on the topographic nature, service availability, surrounding land uses, and other relevant characteristics of the area.
Lot Coverage – Maximum (% of lot area)²	Lot Type	Lot Coverage
	RR-.5	20%
	RR-1	12%
	RR-2.5	7%
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.
Lot Width – Minimum (feet)	100 ft
Lot Depth – Minimum and Maximum (feet)	150 ft and not more than 300% of width
Standard Yards – Minimum³ (feet)
- Front – Standard	20 ft
- Side – Standard, except:	6 ft
- Side – Corner-Street/Alley Side	10 ft
- Rear – Single-Story Building	10 ft
- Rear – Multi-Story Building	10 ft per bldg story
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.
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.