This chapter is intended to allow duplexes in order to increase available housing in the County while maintaining the coherence of single-family residential neighborhoods. (Ord. 603, 11-1-2018)

This chapter applies to proposals to construct a new duplex or to convert, or add on to, an existing structure to create a duplex. They also apply to additions and modifications to existing duplexes. In Residential Zones SR-12000, SR-9000, NR, NR-H, MFR, CMU-R, CMU-S, CMU-H, HMU-R, HMU-S, EMU and RMU a duplex is allowed outright, subject to the lot size requirements for the zone. (Ord. 603, 11-1-2018)

   A.   Density: Overall density in a particular duplex project shall not exceed the maximum density allowed within the zoning district for which it is located, except when designed and developed as a planned unit development under provisions set forth in chapter 349 of this title or as provided in chapter 115, "Density Bonus Agreements", of this title.

   B.   Lot Area: No duplex lot shall contain an area of less than eight thousand (8,000) square feet or as otherwise provided by this title.

   C.   Project Site: As used in this chapter, a duplex project site is the entire parcel of land for which duplex units are proposed prior to the creation of any duplex lots.

   D.   Height Of Structure: Maximum height for any duplex structure shall not be greater than thirty five feet (35').

   E.   Dwelling Unit Access: Each duplex unit shall have two (2) separate entries from the ground on which the structure is erected.

   F.   Building Coverage: In no event shall a duplex, including any accessory buildings cover more than forty five percent (45%) of the individual lot area.

   G.   Street Frontage: Each duplex project site shall border on a public street. (Ord. 603, 11-1-2018)

   A.   In all duplex development, architectural treatment shall be as follows:

      1.   The facades of duplexes in a group shall be varied by changed front yard setbacks and variation in materials or design so that not more than two (2) abutting duplexes will have the same front yard setback and the same or essentially the same architectural treatment of facades and roof lines. (Ord. 603, 11-1-2018)

   A.   Right-Of-Way Setback: No duplex unit shall be located closer than twenty feet (20') from any public right-of-way or within fifteen feet (15') of a private drive, access road, or common open parking area, to the front or rear of such dwelling.

   B.   Setback Variation: No more than two (2) abutting duplexes within the duplex project site shall have a common front building setback. Variations in the setback of front building faces shall be at least two feet (2'). Height variations shall also be incorporated, if feasible, in duplex design.

   C.   Distances Between Duplex Structures: Separations between duplex structures shall comply with the requirements of the zoning district in which it is located. For the Mixed Use Zoning Districts, the separations between duplex structures shall conform to the corresponding zoning district that is closest to the proposed lot sizes. For MFR Zoning Districts, the separation between duplex structures shall comply with the NR building setbacks. (Ord. 603, 11-1-2018)

   A.   Spaces Required: A minimum of two (2) off-street parking spaces shall be provided for the residents of each duplex unit.

   B.   Location: A driveway located in front of a garage accessed through the front yard shall not be less than twenty feet (20') in length as measured from the garage to the right-of-way line. Additional parking shall be located a minimum of five feet (5') behind the front line of the duplex structure.

   C.   Construction: All permanent off-street parking spaces, access drives, and facilities shall be designed and constructed according to the Lyon County Development Standards and Specifications contained in appendix B on file in the County. (Ord. 603, 11-1-2018)

Accessory dwelling units are not permitted on parcels containing a duplex living structure. Refer to subsection 15.335.03A of this title for accessory dwelling unit development standards. No accessory building shall be erected in any front yard or side yard. Accessory buildings other than commonly owned garage, recreation, or maintenance facility may not exceed two hundred (200) square feet, nor shall any separate accessory building be erected within ten feet (10') of any principal building. An accessory building shall not be located within ten feet (10') of the rear property line of any duplex unit or occupy more than twenty five percent (25%) of the rear yard area. (Ord. 603, 11-1-2018)

Each individual unit shall be connected to and serviced by public water and sewer lines. The water and sewer lines shall be independent of any other unit or structure. Water and sewer service facilities shall be designed and constructed in accordance with the Lyon County Design Criteria and Improvement Standards and specifications contained in appendix B on file in the County. Necessary easements shall be indicated and recorded on the final subdivision or parcel map. (Ord. 603, 11-1-2018)

All development under this chapter shall conform to the Lyon County Design Criteria and Improvement Standards and specifications, appendix B on file in the County. (Ord. 603, 11-1-2018)