Chapter 12.08


12.08.010    Purpose.

12.08.020    Minimum area and maximum number of units allowed.

12.08.030    Development standards.

12.08.040    Adoption of mobile/manufactured home regulations by reference.

12.08.050    Installation building permit required.

12.08.060    Pre-existing mobile/manufactured home parks.

12.08.010 Purpose.

The purpose of this chapter is to establish regulations concerning the development and operation of mobile/manufactured home parks. (Ord. 2140 § 2 (Exh. B), 2014; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).

12.08.020 Minimum area and maximum number of units allowed.

A.    Mobile/manufactured home parks shall be not less than 10 acres in size.

B.    The number of mobile/manufactured homes in the mobile/manufactured home park shall not exceed the allowable number of site-built dwelling units which could be constructed on the property in the zone district in which the mobile/manufactured home park is located. (Ord. 2140 § 2 (Exh. B), 2014; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).

12.08.030 Development standards.

Mobile/manufactured home parks shall require a conditional use permit and shall comply with the following development standards and requirements:

A.    Lot Coverage. All impervious surfaces, including mobile/manufactured homes, carports, patios and driveways, shall not exceed 60 percent of the lot area.

B.    Except as provided within BMC 12.08.060, setbacks shall be consistent with the following:

1.    Minimum front yard setbacks for all structures shall be 10 feet.

2.    Minimum rear and side yard setbacks for all structures shall be five feet.

3.    Corner lots shall observe a minimum 10-foot setback from all streets and alleys.

4.    The minimum clearance between mobile/manufactured homes shall not be less than 10 feet.

5.    The clearance between mobile/manufactured homes and any accessory building(s) situated on the same lot shall be as follows:

a.    For one-hour fire-resistive structures, a minimum of three feet or the dimension established by the building and fire codes;

b.    Carports may abut mobile/manufactured homes;

c.    For all other structures, a minimum of six feet.

6.    Eaves may project up to a maximum of 18 inches into any required setback area.

C.    Parking Spaces.

1.    A minimum of two off-street parking spaces per mobile/manufactured home shall be provided on the lot on which the mobile/manufactured home is located.

2.    Vehicles over 10,000 pounds gross license weight and recreational vehicles shall not be parked or stored on the individual lots or on the street. A separate storage area shall be provided with appropriate fencing and visual screening.

D.    Streets and Access.

1.    Access to and from the mobile/manufactured home park shall be from a minor arterial or collector street. Access to mobile/manufactured home lots shall be from interior streets only. No individual access to any mobile/manufactured home lot shall be from streets adjacent to the exterior of the mobile/manufactured home park.

2.    Driveways providing entrances or exits to the mobile/manufactured home park shall be no closer than 50 feet from an intersection, measured from the existing or proposed right-of-way, whichever is the greater.

3.    All streets and access roads so designated in the review process shall be completed prior to occupancy of any mobile/manufactured home.

4.    All streets and access roads shall be designed and constructed in accordance with the Bothell Design and Construction Standards and Specifications.

E.    Landscaping – Recreation Space.

1.    At least 10 percent of the gross area within the mobile/manufactured home park shall be set aside as active recreation space. The 25-foot buffer area required by subsection (E)(2) of this section shall not be counted towards meeting the 10 percent requirement.

2.    A 25-foot minimum buffer area around the perimeter of the mobile/manufactured home park is required. The buffer area shall contain perimeter screening of evergreen plantings, a minimum of five feet in height when installed, which will grow to a minimum of eight feet in height within five years.

3.    The developer shall furnish to the city a performance bond or other suitable security in a form approved by the community development department to ensure installation of the landscaping prior to any construction in the mobile/manufactured home park.

F.    Drainage. Drainage and runoff plans shall conform to city requirements.

G.    Sewers. Each mobile/manufactured home shall be connected to sanitary sewers. A valid side sewer permit shall be obtained prior to any connection to city sewers.

H.    Fire Flow. The development shall comply with city fire flow requirements, including but not limited to size, location and arrangement of water mains and spacing of fire hydrants. (Ord. 2140 § 2 (Exh. B), 2014; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).

12.08.040 Adoption of mobile/manufactured home regulations by reference.

Chapter 296-150M WAC as currently promulgated, together with any future amendments thereof or future additions thereto, is adopted by this reference and incorporated into this code as if set forth in this section in full. The building official, or designee, is authorized to inspect the installation of mobile and/or manufactured homes, issue permits for all mobile and/or manufactured homes that meet the requirements of this chapter and enforce all violations of this chapter. (Ord. 2140 § 2 (Exh. B), 2014; Ord. 1957 § 1 (Exh. B), 2006; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).

12.08.050 Installation building permit required.

No mobile/manufactured home shall be placed on any lot within the city unless a valid installation building permit has been issued by the city pursuant to the provisions of this chapter. (Ord. 2140 § 2 (Exh. B), 2014; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).

12.08.060 Pre-existing mobile/manufactured home parks.

A.    All mobile/manufactured home parks existing on April 1, 1996, and which were in compliance with existing city or county codes at the time of their establishment, shall be legal nonconforming uses and shall be entitled to the number of mobile homes which was permitted by the applicable ordinance in effect at the time the mobile/manufactured home park was established; provided, however, that no increase in number of units allowed or change in the location of any mobile home shall be allowed unless the provisions of this chapter are met.

B.    Setbacks applied to structures within the existing Hollyhills and Woodcrest Estates Mobile/Manufactured Home Parks shall be based upon the setback dimensions of Table 12.08-1 below; provided, that all setback dimensions shall be consistent with the city-adopted building and fire codes:

Table 12.08-1 Setbacks Applicable to Hollyhills and Woodcrest Estates Mobile Home Parks


Hollyhills MHP

Woodcrest Estates MHP


5 feet

10 feet


0 feet

5 feet


0 feet

5 feet

Distance between mobile homes

10 feet

15 feet

Distance from accessory buildings2

3 feet

3 feet


1.    Corner lots shall observe a minimum setback of 10 feet from all streets and alleys.

2.    The distance from accessory buildings to the mobile or manufactured home may be reduced when consistent with the building and fire codes.

(Ord. 2140 § 2 (Exh. B), 2014; Ord. 1815 § 1, 2000; Ord. 1629 § 1, 1996).