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Home My WebLink AboutPZ Item 01 - Accessory Dwelling UnitsMEMO TO: PLANNING AND ZONING COMMISSION FROM: ERICA MAROHNIC, PLANNING SERVICES DIRECTOR MEETING DATE: SEPTEMBER 19, 2023, BRIEFING SESSION SUBJECT: RECEIVE A REPORT, HOLD A DISCUSSION, AND PROVIDE STAFF DIRECTION REGARDING SERVANTS' QUARTERS, GUEST HOUSES, AND ACCESSORY DWELLING UNITS IN THE "R-20", SINGLE-FAMILY DISTRICT, AND TAKE ANY NECESSARY ACTION. BACKGROUND: The Planning and Zoning Commission (Commission) held a workshop on August 1, 2023, and discussed accessory dwelling units (ADUs) as they relate to the existing Zoning Ordinance, and how they are referred to as servant's quarters and guest houses within Section 13, "R-20" Single -Family District. Feedback was provided by the Commission regarding the current zoning requirements and ways it could be improved including updating the definition and use, clarifying density and occupancy restrictions, clarifying bulk, dimensional, and setback requirements, and establishing specific design requirements. Planning Services staff has drafted amendments and edits to the existing Zoning Ordinance for the Commission's consideration and further feedback. ATTACHMENTS: 1. Proposed Amendments Related to Accessory Dwelling Units 2. ADU Exhibits — Existing and Proposed DRAFT Accessory Dwelling Units (ADUs) Proposed Amendments Related to Accessory Dwelling Units (ADUs) Section 12, Definitions SERVANTSLCMRTERE ACCESSORY DWELLING UNIT shall mean are aGGessery secondary, dwelling located on a lot with a main nrimary (detached' residentialc-e structure and used as living quarters for persons employed on the premises or legally related to the propertv owner, and not for rent or use as a separate residence or dwelling. dovrmiGiIse of other than persons nleyed en the premises, and with-ne separate utility meters 0 0 permanent GGGUpanGy, and SUGh building not having a separate utility meter. Section 13, "R-20 , Single -Family District Subsection 8, Accessory Uses The following uses shall be permitted as accessory uses to a single-family detached dwelling provided that none shall be a source of income to the owner or user of the principal single-family dwelling, except for customary home occupation. 1. Off-street parking and private garages in connection with any use permitted in this district. 2. Accessory Dwelling Unit. Refer to Section 42.C.6. for supplementary district standards related to accessory dwelling units. SeNants' quarters not rented to anyone otherthan the family of a bona fide con�t gi ipg—mero than fifty (50) nornont of his nr her employed time at the premises -tohiGh the servants' quarterc is an aGGeSsvor\/ use and In the employ of the family GGG p yino said promisee 3 Guest q garters cCabana, pavilion, or roofed area. 4. Private swimming pools and tennis courts. 5. Accessory buildings (storage buildings, hobby shops, barns). 6. Signs subject to the provisions of Section 60. 7. Customary home occupation. 8. Communication equipment meeting the requirements of Chapter 7, Article XII of the Grapevine Code of Ordinance. 9. Sale of merchandise or goods, including but not limited to garage sales and yard sales, shall be limited to a maximum of once per quarter, for a period not to exceed three (3) continuous days. For the purpose of this paragraph, the month of January shall constitute the first month of the first quarter. With the exception of Items 2 and 9, when any of the foregoing permitted accessory uses are detached from the principal single-family dwelling, said uses shall be located not less DRAFT than forty-five (45) feet from the front lot line and shall meet the requirements of Section 42.C.,D.,E.,F. and G. Accessory buildings more than sixteen (16) feet in height shall be set back from the rear property line six (6) feet plus two (2) additional feet for each additional foot of height over sixteen (16) feet. The height of the structures shall be measured from the top of the slab or from its bottom floor. Section 42, Supplementary District Regulations Subsection C, Accessory Buildings 6. Accessory Dwelling Units a. General A. Must be located on the same lot as the primary (detached) dwelling unit. B. One (1) accessory dwelling unit is allowed per lot. C. Modular and/or manufactured housing units fabricated off -site are prohibited for use as an accessory dwelling unit. D. Limited to one (1) bedroom. E. Utility services must be on the same meter as the primary dwelling unit. F. The property owner must occupv the primary dwelling unit as a permanent residence and cannot receive rent for the accessory dwelling unit. b. Dimensional Requirements A. Maximum Building Height — one story. 16 feet. B. Maximum Building Area — 750 square feet. C. Minimum Separation from Primary Dwelling Unit — 10 feet. D. Must be located in the rear 50% of the lot. E. Setbacks: 1. Internal lots - Setback a minimum of 15 feet from the side property line and 6 feet from the rear property line. 2. Corner lots — Setback a minimum of 15 feet from the side property line on the street -facing side and 6 feet from the rear property line. 2 DRAFT 3. Reverse Frontage lots — Set back a minimum of 40 feet from the front propertv line. 40 feet from the side propertv line on the street - facing side. 15 feet from the side propertv line adiacent to the interior propertv line, and 25 feet from the rear propertv line. c. Architecture and Design Standards A. Accessory dwelling units must be: 1. Constructed of the same or similar exterior building materials and finishes: 2. Architecturally designed to be compatible with the primary dwelling unit and feature the same or similar roof pitch: floorplate height: tvpes and placement of doors windows and other openings: other exterior finishes: material colors: and 3. Attached to an engineered permanent foundation per the adopted International Building Code, state law, and set on the ground. d. Access and Parkinq A. Drivewav access and off-street parking must be shared with the primary dwelling unit and may not be comprised of multiple detached driveways. B. Off-street parking must comply with Section 56, Off -Street Parking. 3 "R-20", Single -Family District Existing Servant's Quarters/ Accessory Structure Regulations (1 Story) 2,400 sgft ADU ■ � Rear one -Half of the Lot 0 +o • 25,600 sgft Lot 1,000 sgft Driveway Distance Between Buildings Maximum Building Coverage Percentage of Rear Yard Maximum Impervious Area Total Lot Size — 25,600 sq.ft. Total Required Rear Yard — 4,000 sq.ft. Possible ADU Footprint — 2,400 sq.ft. w 2,500 sgft Primary Dwelling Frank Yard Setback T aAgD". Required 10 ft 40% 60% 60% L b Ln N Rear Yard Setback Shown 29 ft 19.14% 35% 23.05% Side Yard Setback ■ 15, or ■ "R-20", Single -Family District Existing Servant's Quarters/ Accessory Structure Regulations (1.5 Stories) . 15. 0" ► .Rear Yard I Setba of c LO 2,4D0 sgftADU 1.5 Stories (20 ft niax.) +1 U L,. Distance Between Buildings Maximum Building Coverage Percentage of Rear Yard Maximum Impervious Area Total Lot Size — 25,600 sq.ft. Total Required Rear Yard — 4,000 sq.ft. Possible ADU Footprint — 2,400 sq.ft. �10 0 -415 0 ► 2.500 scif t Primary Dwelling a 1i lrtrrri'?ene Setbagk Required Shown 10 ft 14 ft 40% 19.14% 60% 15% 60% 23.05% "R-20", Single -Family District PROPOSED ADU Regulations 24360 6 f, & La" IPW sgft D]rhe—y 2,500 sgft Primary Dwelling "I s Required Shown Distance Between Buildings 10 ft 38 ft Maximum Building Coverage 40% 12.70% Percentage of Rear Yard None 12.5% Maximum Impervious Area 60% 16.60% Total Lot Size — 25,600 sq.ft. Total Required Rear Yard — 4,000 sq.ft. Maximum Possible ADU Footprint — 750 sq.ft. Maximum Possible Height — 1 Story