R-10 -- Low-Density Residential, Alpine/Slope District

The R-10 district is intended for those areas where natural physical features and environmental factors such as slopes, alpine and forest vegetation, soils, slope stability, and geologic hazards require unique and creative design for development. Creative site design and site engineering are essential. See AMC 21.04.020O. for more information.

Average

Lot Requirements

Setback Requirements

Building Height

Driveway

Lot
Slope1

Area

Width

Building
Coverage

Impervious
Surface2

Front

Side

Rear

Principal

Detached Garage

Accessory

Surface

More than 30.00%

7.50 acres

300 feet

3%

8%

10 feet

50 feet

10 feet

30 feet

25 feet

18 feet

Gravel

25.01% - 30.00%

5.00 acres

300 feet

5%

10%

10 feet

25 feet

10 feet

30 feet

25 feet

18 feet

Gravel

20.01% - 25.00%

2.50 acres

180 feet

8%

14%

10 feet

25 feet

10 feet

30 feet

25 feet

18 feet

Gravel

20.00% or less

1.25 acres

100 feet

10%

20%

10 feet

25 feet

10 feet

30 feet

25 feet

18 feet

Gravel

1 The formula to determine average lot slope S is: S=(I)(L)(0.0023)/A where I is the contour interval (maximum of 20 feet), L is the sum of the length of all contours on the lot or tract, and A is the area of the lot or tract in acres. One acre equals 43,560 square feet.

2 All parking areas, driveways, roads, sidewalks and walkways, whether paved or not, and any areas covered by buildings or structures, concrete, asphalt, brick, stone, wood, ceramic tile or metal, are considered to be impervious surfaces.

Only a single principle structure is allowed on any lot or tract.

If you use the online version of the code (under "External Links"), search on '21.06.020" for more information. Please note that recent amendments may not have been published yet. Planning Staff will be happy to verify the current code language for you.