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A. Purpose. The R-4 Single-Family Urban Residential zone provides for primarily single-family residential neighborhoods on lands suitable for residential development with an allowed base density of four dwellings per gross acre. This designation provides for stable and attractive suburban residential neighborhoods that have a full range of public services and facilities. To complement the primarily residential nature of these zones, some nonresidential uses are allowed.

Figure 21.08.060A
Typical Subdivision Layout R-4

Typical Subdivision Layout R-4

Figure 21.08.060B
Typical Site Layout R-4

This sketch represents maximum allowance for structures, impervious surface & setbacks

Typical Site Layout R-4

LEGEND

A

FRONT SETBACK MINIMUM 15'-0"

B

SIDE STREET SETBACK MINIMUM 15'-0"

C

SIDE INTERIOR SETBACK 5'-0"/10'-0"

D

REAR SETBACK MINIMUM 10'-0"

E

LOT FRONTAGE MINIMUM 20'-0"

F

ALLOWED PROJECTION OF BUILDING EXTREMITIES INTO SETBACK

G

LOT WIDTH CIRCLE MINIMUM 40'-0" (DIAMETER)

H

GARAGE SETBACK MINIMUM 18'-0"

I

LOT-BY-LOT OPEN SPACE MINIMUM 15'-0"

J

BUILDING SEPARATION MINIMUM 10'-0"

B. Maximum Development Yield. The following calculation provides a potential maximum development yield for a development utilizing the density bonuses available for the R-4 zone. The calculation is based on a development occurring on a one-acre lot. Please note that accessory dwelling units do not count toward maximum development yield.

Table 21.08.060A
Maximum Development Yield

Base Density

Available Density Bonuses

Maximum Density

4 dwelling units per gross acre

Cottage Development: Up to 1.75 cottages allowed in place of each standard size dwelling unit

7 dwelling units allowed

Green Building/Green Infrastructure Development: Up to 10 percent of base density

0.40 dwelling units allowed

Affordable Housing: Up to 15 percent of base density

0.60 dwelling units allowed

Total = 8 dwelling units per gross acre

C. Regulations Common to All Uses.

Table 21.08.060B
Regulations Common to All Uses

Regulation

Standard

Exceptions

Minimum

Average Lot Size

7,000 square feet

Required Density

80 percent of net acres

Lot Width Circle

40 feet

Lot Frontage

20 feet

Setbacks

Front

15 feet

For zero lot line development, a dwelling unit may be placed on one interior side property line, giving it one zero side/interior setback. If it is an interior lot line, the setback from the other side property line shall be 10 feet. See RZC 21.08.390, Zero Lot Line Development, for additional requirements.

Garage

18 feet

Side / Interior (each side)

5 feet / 10 feet

Side Street

15 feet

Rear

10 feet

Alley

4 feet

Lake Sammamish

35 feet

Building Separation

10 feet

Minimum building separation shall be 15 feet in the following neighborhoods: Education Hill, North Redmond, and Willows/Rose Hill. In all neighborhoods, minimum building separation shall be 10 feet for cottages, size-limited dwellings, small-lot short plats, accessory dwelling units, and locations where these structures or cottages adjoin larger dwelling units.

Open Space

20 percent of total lot area

Maximum

Lot Coverage for Structures

35 percent of total lot area

Impervious Surface

60 percent of total lot area

Building Height

35 feet

30 feet within the Shoreline Jurisdiction

Drive-through

n/a

Drive-through facilities are prohibited except where expressly permitted in the Allowed Uses and Special Regulations table below.

D. Allowed Uses and Special Regulations. The following table contains special zoning regulations that apply to uses in the R-4 zone. To use the chart, first read down the left-hand column titled “Use.” When you have located the use that interests you, read across to find regulations that apply to that use. Uses are permitted unless otherwise specified in the Special Regulations column. Permitted uses may require land use permit approval. See RZC 21.76.020, Overview of the Development Process, for more information. Uses not listed are not permitted.

Table 21.08.060C
Allowed Uses and Special Regulations

Section

Use

Parking Ratio:
Unit of measure (Minimum required; Maximum allowed)

Special Regulations

Residential1

1

Detached dwelling unit

Dwelling unit (2.0)

2

Cottage

Cottage (1.5, 2.0)

Permitted use only in Bear Creek, Education Hill, Grass Lawn, North Redmond, Overlake Residential, and Willows/Rose Hill neighborhoods. See RZC 21.08.290, Cottage Housing Developments, for specific site development requirements and supplemental neighborhood regulations which may apply.

3

Small-lot short plat

Dwelling unit (2.0)

Permitted use only in Education Hill, Idylwood, and Overlake Residential neighborhoods. See RZC 21.08.170.E.2.a.ii, Small Lot Short Plats, for specific regulations which may apply.

4

Size-limited dwelling

5

Accessory dwelling unit (ADU)

ADU (1.0)

A. See RZC 21.08.220, Accessory Dwelling Units, for specific regulations which may apply.

B. ADUs are not allowed within cottage developments in the Willows/Rose Hill and Education Hill neighborhoods.

6

Attached dwelling unit, 2-4 units

Dwelling unit (2.0)

A. Permitted use in Education Hill, Grass Lawn, North Redmond, Southeast Redmond, and Overlake Residential neighborhoods. In Willows/Rose Hill neighborhood, 2-unit attached dwelling units are permitted use; 3-unit and 4-unit attached dwelling units require a Conditional Use Permit as part of a demonstration program. A Conditional Use Permit is required for attached dwelling units in all other neighborhoods not listed above.

B. Please see RZC 21.08.260, Attached Dwelling Units, for supplemental neighborhood regulations related to density, design, and review and decision procedures.

7

Manufactured home

Dwelling unit (2.0)

Please see RZC 21.08.320, Designated Manufactured Homes, Manufactured Homes, and Mobile Homes, for specific regulations which may apply.

8

Retirement residence

See Special Regulations

A. Permitted if developed through the subdivision or binding site plan processes. Otherwise, a Conditional Use Permit is required. See RZC 21.08.370, Retirement Residences, for specific regulations which may apply.

B. Parking requirements are as follows:

1. With no skilled nursing facility: Unit (1.0, 1.0) 

2. With skilled nursing facility: Worker on largest shift (1.25, 1.25)

C. A Traffic Mitigation Plan is required. See RZC 21.08.370.C.3.b.iii.

9

Residential care facility

A Conditional Use Permit is required.

10

Adult family home

Dwelling unit (2.0)

General Sales or Service

11

Bed and Breakfast Inn

Rental room (1.0)

Permitted use if no more than two rooms. A Conditional Use Permit is required for inns with between three and eight rooms.

Transportation, Communication, Information, and Utilities

12

Road, Ground, Passenger and Transit Transportation

N/A

Regional light rail transit system only. No vehicle storage.

13

Local utilities

Adequate to accommodate peak use.

14

Regional utilities

A Conditional Use Permit is required.

15

Heliport

N/A

A Conditional Use Permit is required. Does not include medical airlift. Permitted only abutting Lake Sammamish.

16

Float plane facility

A. A Conditional Use Permit is required. Permitted only abutting Lake Sammamish.

B. Piers, docks, and floats associated with the operation of float planes shall meet, as a minimum, the location criteria contained in RZC 21.68.070, In-Water Structures. Piers and docks are also subject to standards for residential piers and docks contained in RZC 21.68.070.E, Piers, Docks, and Floats. (SMP)

C. Only one float plane per lot is permitted. (SMP)

D. Float planes shall observe speed regulations for watercraft and vessels contained in RMC 14.16.030, Speed Regulations, except that these speeds may be exceeded for a short duration of time during landing and takeoff of planes. (SMP)

E. Float plane facilities or operation of float planes is prohibited on the Sammamish River, Bear Creek and Evans Creek. (SMP)

F. Float plane facilities and operation shall comply with FAA standards, including standards for fueling, oil spill cleanup, firefighting equipment, and vehicle and pedestrian separation. (SMP)

17

Wireless Communication Facilities

See RZC 21.56, Wireless Communication Facilities, for specific regulations that may apply.

Arts, Entertainment, and Recreation

18

Community indoor recreation

Adequate to accommodate peak use.

Includes noncommercial indoor recreation uses, such as community clubhouses, indoor swimming pools, and other similar facilities.

19

Parks, open space, trails and gardens

1,000 sq ft gfa (0, adequate to accommodate peak use.)

Permitted if public or noncommercial. A Conditional Use Permit is required for commercial facilities.

20

Athletic, sports, and play fields

Adequate to accommodate peak use.

A Conditional Use Permit is required.

21

Golf course

22

Marine recreation

23

Commercial swimming pool

Education, Public Administration, Health Care, and Other Institutions

24

Day care center

Employee (1.0)

A Conditional Use Permit is required. Day care uses are only permitted in a building or building complex used for other uses, such as a school, church, meeting hall, or some other building used for more than one purpose. See RZC 21.08.310, Day Care Centers, for specific regulations which may apply.

25

Family day care provider

Vehicle used by the business (1.0).

Family day care providers are permitted as home businesses. See RZC 21.08.340, Home Business, for specific regulations which may apply.

26

Public safety

Adequate to accommodate peak use

A Conditional Use Permit is required.

27

Grade schools (K-12)

28

Religious Institution

1,000 sq ft gfa for assembly (1.0) or 5 fixed seats (1.0); 3 seats (1.0).

A. Permitted use if less than 250 seats. A Conditional Use Permit is required for religious institutions with between 250 and 750 seats. See RZC 21.08.280, Churches, Temples, Synagogues and Other Places of Worship, for specific regulations which may apply.

B. A Traffic Mitigation Plan is required. See RZC 21.08.280.C.5.

Agriculture

29

Crop production

N/A

30

Equestrian facility

A Conditional Use Permit is required.

Other

31

Home Business

Vehicle used by the business (1.0).

See RZC 21.08.340, Home Business, for specific regulations which may apply.

32

Roadside produce stand

N/A

33

Pier, dock, float

See RZC 21.68.070, In-Water Structures, for special height, setback and area requirements. (SMP)

36

Water-oriented accessory structure

See RZC 21.68.070.G, Water-Oriented Accessory Structures, for special height, setback and area requirements. (SMP)

Notes:

1Permanent supportive housing, as defined under RCW 36.70A.030, and transitional housing, as defined under RCW Chapter 84.36, are allowed in all land use districts where residential dwellings and/or hotel uses are allowed, subject to RZC 21.57.010, Permanent Supportive Housing, Transitional Housing, and Emergency Housing.

(Ord. 2652; Ord. 2709; Ord. 2803; Ord. 2883; Ord. 2919; Ord. 3074)

Effective on: 2/12/2022