Skip to content
ChatProjectCodes

Chapter 18.66 — SECOND UNITS

Patterson Municipal Code · 2026-07 edition · updated 2026-09-27 · Patterson

§ 18.66.010. Purpose and applicability.

This chapter provides development standards related to second units (also referred to as accessory dwelling units or "granny flats") when permitted according to Table 18.38.030-1 (Permitted Use Matrix for Residential Districts). (Ord. 738 § 1 (Exh. A) (part), 2013)

§ 18.66.020. General provisions.

  • A. Location. One secondary dwelling unit shall be allowed when accessory to one existing single-family detached unit. The secondary dwelling unit may be established by the conversion of an attic, basement, garage, or other portion of a single-family unit; a detached secondary unit may be established by the conversion of an accessory structure or may be established by new construction.

  • B. Zoning District. Except as provided in this chapter, all requirements and regulations of the zoning district in which the lot is situated shall apply.

  • C. Setbacks and Separation. The secondary dwelling unit shall observe a four-foot setback from the rear and side property lines and a ten-foot setback from the main dwelling unit.

  • D. Height. The structure shall not exceed a single-story height and sixteen feet if the building is detached, excepting existing nonconforming structures. If attached, the height applicable to the primary dwelling applies.

  • E. Repealed by Ord. 848.

  • F. Size of Unit. The following applies to the size of the secondary dwelling unit:

    1. No less than two hundred seventy-five square feet.

    2. No more than eight hundred fifty square feet of floor area or, if the secondary dwelling unit includes more than one bedroom, no more than one thousand square feet of floor area. The eight hundred square feet of floor area may be exceeded when the second unit is an internal conversion of an existing single-family dwelling unit. In such case, the maximum size of the second unit shall not exceed forty percent of the existing dwelling.

    3. The ratio of the main unit size in comparison to the secondary dwelling unit size shall not be less than two to one, except as provided for internal conversions of existing structures.

    4. The secondary dwelling unit shall be clearly subordinate to the principal single-family dwelling unit on the lot by size, location, and appearance. The existing single-family dwelling unit shall contain a minimum one thousand one hundred square feet floor area. In no case shall the secondary dwelling unit contain more than two bedrooms.

  • G. Parking. One covered or uncovered off-street parking space shall be provided for the secondary dwelling unit. This requirement shall be in addition to the off-street parking spaces required for the existing residence, unless the secondary dwelling unit is created

Downloaded from https://ecode360.com/PA4584 on 2026-07-07

City of Patterson, CA

ZONING

§ 18.66.020

§ 18.66.020

through the conversion of a garage, carport, or other parking structure, in which case, the removed parking spaces are not required to be replaced.

  • H. Standards. The establishment of any secondary dwelling unit shall be subject to the following:

    1. The secondary dwelling unit shall be in compliance with applicable building, fire, and other health and safety codes.

    2. The secondary dwelling unit shall be in compliance with underlying zoning requirements and regulations, except as may be provided in this chapter.

  1. The secondary dwelling unit shall be in compliance with the city-adopted design guidelines for residential development, except as may be provided in this chapter.

    1. Addresses for secondary dwelling units shall be shown prominently on the frontage of the unit. Frontage should be located facing a street or alleyway and/or have a welldefined entry area.

  2. Frontage area landscaping is required and shall follow established guidelines.

(Ord. 738 § 1 (Exh. A) (part), 2013; Ord. 767 (part), 2014; Ord. 848, 2020)

Downloaded from https://ecode360.com/PA4584 on 2026-07-07

City of Patterson, CA

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸Contents — Patterson Municipal Code
Patterson Municipal Code
  1. Title 1
  2. Title 2
  3. Chapter 2.34 — DISPOSAL OF UNCLAIMED PROPERTY
  4. Chapter 2.04 — CITY OFFICE
  5. Chapter 2.08 — CITY COUNCIL MEETINGS
  6. Chapter 2.10 — COUNCIL MEMBER ELECTIONS BY DISTRICT
  7. Chapter 2.12 — COMPENSATION OF CITY OFFICIALS
  8. Chapter 2.14 — CITY ATTORNEY
  9. Chapter 2.16 — CITY MANAGER
  10. Chapter 2.18 — FINANCE DIRECTOR
  11. Chapter 2.20 — SUPERINTENDENT OF STREETS
  12. Chapter 2.22 — POLICE DEPARTMENT
  13. Chapter 2.24 — FIRE DEPARTMENT
  14. Chapter 2.28 — LAW ENFORCEMENT OFFICER TRAINING
  15. Chapter 2.34 — DISPOSAL OF UNCLAIMED PROPERTY
  16. Chapter 2.36 — EMERGENCY SERVICES
  17. Chapter 2.40 — PLANNING COMMISSION
  18. Chapter 2.44 — INDUSTRIAL DEVELOPMENT AUTHORITY
  19. Chapter 2.48 — ECONOMIC STRATEGIC COMMISSION
  20. Chapter 2.50
  21. Chapter 2.52 — PARKS AND RECREATION COMMISSION
  22. Chapter 2.54 — BEAUTIFICATION COMMITTEE
  23. Chapter 2.60 — REDEVELOPMENT AGENCY AND PLAN
  24. Chapter 2.70 — SENIOR COMMISSION
  25. Title 3
  26. Chapter 3.12 — FUNDS
  27. Chapter 3.16
  28. Chapter 3.20 — SALES AND USE TAX
  29. Chapter 3.24 — REAL PROPERTY TRANSFER TAX
  30. Chapter 3.28 — GENERAL GOVERNMENT IMPACT FEE
  31. Chapter 3.40
  32. Chapter 3.44 — CLAIMS PROCEDURES
  33. Chapter 3.48 — COMMUNITY FACILITIES IMPACT FEE
  34. Chapter 3.52 — PUBLIC SAFETY IMPACT FEE
  35. Chapter 3.56 — GENERAL PLAN REIMBURSEMENT FEE
  36. Chapter 3.64 — NEW DEVELOPMENT IMPACT FEES
  37. Chapter 3.68 — TRANSIENT OCCUPANCY TAX
  38. Chapter 3.70
  39. Title 5
  40. Chapter 5.04 — BUSINESS LICENSES GENERALLY
  41. Chapter 5.08 — PEDDLERS AND SOLICITORS
  42. Chapter 5.09 — MASSAGE ESTABLISHMENTS
  43. Chapter 5.10
  44. Chapter 5.11 — GARAGE SALES
  45. Chapter 5.12 — TAXICABS—VEHICLES FOR HIRE
  46. Chapter 5.14 — CANNABIS BUSINESS TAX[2 ]
  47. Chapter 5.16 — TELEVISION ANTENNA ERECTION
  48. Chapter 5.20 — POOL AND BILLIARDS—CARD ROOMS
  49. Chapter 5.24 — INTOXICATING LIQUORS
  50. Chapter 5.30 — BINGO GAMES
  51. Chapter 5.38
  52. Chapter 5.40 — ALARM RESPONSE
  53. Chapter 5.44 — JUNK DEALERS AND SCRAP METAL RECYCLERS
  54. Title 6
  55. Chapter 6.04 — RESTAURANTS
  56. Chapter 6.08 — MILK AND MILK PRODUCTS
  57. Chapter 6.10 — SMOKING POLLUTION CONTROL
  58. Chapter 6.12 — GARBAGE REMOVAL
  59. Chapter 6.13 — CURBSIDE RECYCLING PROGRAM
  60. Chapter 6.14 — CONSTRUCTION AND DEMOLITION DEBRIS RECYCLING PR…
  61. Chapter 6.15
  62. Chapter 6.16 — PROPERTY MAINTENANCE
  63. Chapter 6.18 — NEGLECTED VACANT STRUCTURES
  64. Chapter 6.20 — MISTLETOE ABATEMENT
  65. Chapter 6.24
  66. Chapter 6.28 — FIREWORKS SALES AND DISCHARGE
  67. Chapter 6.29
  68. Chapter 6.32 — TRAILERS
  69. Chapter 6.36 — DRUG PARAPHERNALIA
  70. Chapter 6.40 — HAZARDOUS MATERIALS
  71. Chapter 6.48 — RIGHT TO FARM
  72. Chapter 6.50 — GRAFFITI
  73. Chapter 6.52 — MEDICAL MARIJUANA DISPENSARIES (Repealed by Ord…
  74. Chapter 6.53 — REGULATING SMOKING AND TOBACCO PRODUCT USE IN C…
  75. Chapter 6.56 — CANNABIS BUSINESS PROGRAM
  76. Chapter 6.57
  77. Chapter 6.58 — CANNABIS CAMPUS PILOT PROGRAM
  78. Title 7
  79. Chapter 7.58 — ANIMALS IN RESIDENTIAL AREAS
  80. Chapter 7.04 — GENERAL PROVISIONS
  81. Chapter 7.14
  82. Chapter 7.16
  83. Chapter 7.28 — DANGEROUS ANIMALS
  84. Chapter 7.36 — RABIES CONTROL
  85. Chapter 7.44 — DEAD OR ABANDONED ANIMALS
  86. Chapter 7.48 — VIOLATION—PENALTY
  87. Chapter 7.50 — ANIMAL SERVICE FEES
  88. Chapter 7.54 — BREEDING AND TRANSFERRING OF DOGS AND CATS, AND…
  89. Chapter 7.58 — ANIMALS IN RESIDENTIAL AREAS
  90. Title 9
  91. Chapter 9.04 — FIRE HYDRANTS
  92. Chapter 9.08 — USE OF WATER DURING FIRES
  93. Chapter 9.12 — POLICE DOGS
  94. Chapter 9.14 — STREET GANGS
  95. Chapter 9.16 — GAMBLING
  96. Chapter 9.18 — INDECENT EXPOSURE
  97. Chapter 9.20 — ADULT-RELATED ESTABLISHMENTS
  98. Article II
  99. Article III
  100. Article IV — Miscellaneous Provisions
  101. Chapter 9.24 — BILL POSTING AND PAINTING ON PROPERTY
  102. Chapter 9.26 — SHOPPING CART REGULATIONS
  103. Chapter 9.27 — UNATTENDED COLLECTION BIN PERMIT
  104. Chapter 9.28 — FORTUNETELLING
  105. Chapter 9.32 — MINOR'S CURFEW
  106. Chapter 9.34 — DISPLAY OF ADULT MATTER TO MINORS
  107. Chapter 9.35
  108. Chapter 9.36 — WEAPONS
  109. Chapter 9.40 — FIREARMS POSSESSION AND FIRING
  110. Chapter 9.43 — HEALTH AND HYGIENE
  111. Chapter 9.50 — CAMPING WITHIN CITY LIMITS
  112. Chapter 9.54
  113. Chapter 9.55 — SEX OFFENDER RESIDENCY RESTRICTIONS
  114. Title 10
  115. Chapter 10.04 — GENERAL TRAFFIC REGULATIONS—PENALTIES
  116. Chapter 10.06 — GENERAL PARKING RESTRICTIONS
  117. Chapter 10.12 — PARKING, STOPPING AND STANDING
  118. Chapter 10.16 — PARKING AREAS OF CITY
  119. Chapter 10.20 — LOADING AND UNLOADING—ALLEYS—BUS AND TAXI STOPS
  120. Chapter 10.22 — OVERSIZED VEHICLES
  121. Chapter 10.24 — ABANDONED VEHICLES
  122. Chapter 10.28
  123. Article I — Licensing And Sale
  124. Chapter 10.32 — TRUCK ROUTES
  125. Chapter 10.34 — INTERSTATE TRUCK TERMINALS AND ROUTES
  126. Chapter 10.36 — TRAINS BLOCKING STREETS
  127. Chapter 10.40 — SPEED LIMITS
  128. Chapter 10.42 — FUNERAL PROCESSIONS
  129. Title 12
  130. Chapter 12.04 — EXCAVATIONS
  131. Chapter 12.06 — STREET TRENCH CUT COST RECOVERY FEE
  132. Chapter 12.08 — OBSTRUCTIONS TO STREETS
  133. Chapter 12.12 — SIDEWALK AND CURB CONSTRUCTION[1 ]
  134. Chapter 12.14
  135. Chapter 12.16 — TREES
  136. Chapter 12.20 — ENCROACHMENT REGULATIONS
  137. Chapter 12.24 — PARK REGULATIONS
  138. Chapter 12.30 — SKATE PARK FACILITY
  139. Title 13
  140. Chapter 13.02 — SANITARY CODE
  141. Article XI — Miscellaneous Provisions
  142. Article XI — Miscellaneous Provisions
  143. Chapter 13.04 — SEWER EXTENSIONS
  144. Chapter 13.08 — OUTSIDE SEWER CONNECTIONS
  145. Chapter 13.24 — WATER SYSTEM
  146. Chapter 13.28
  147. Title 15
  148. Chapter 15.04 — CALIFORNIA BUILDING CODE
  149. Chapter 15.08 — FIRE HAZARD SEVERITY ZONES
  150. Chapter 15.20 — CALIFORNIA FIRE CODE
  151. Chapter 15.24 — MOVING BUILDINGS
  152. Chapter 15.04 — CALIFORNIA BUILDING CODE
  153. Chapter 15.06 — CALIFORNIA ENERGY CODE[1 ]
  154. Chapter 15.08 — FIRE HAZARD SEVERITY ZONES[2 ]
  155. Chapter 15.12 — PLUMBING CODE (Repealed by Ord. 798)
  156. Chapter 15.14 — CALIFORNIA PLUMBING CODE
  157. Division II — Organization and Enforcement
  158. Chapter 15.18 — CALIFORNIA ELECTRICAL CODE
  159. Chapter 15.20 — CALIFORNIA FIRE CODE
  160. Chapter 15.22 — ELEVATOR SAFETY CODE (Repealed by Ord. 798)
  161. Chapter 15.24 — MOVING BUILDINGS
  162. Chapter 15.26
  163. Chapter 15.28 — SWIMMING POOLS (Repealed by Ord. 798)
  164. Chapter 15.30 — SWIMMING POOL, SPA AND HOT TUB CODE
  165. Chapter 15.32 — SIGNS AND SIGN STRUCTURES
  166. Chapter 15.36 — HOUSING CODE
  167. Chapter 1 — TITLE AND SCOPE
  168. Chapter 2 — ENFORCEMENT
  169. Chapter 3 — PERMITS AND INSPECTIONS
  170. Chapter 4 — DEFINITIONS
  171. Chapter 5 — SPACE AND OCCUPANCY STANDARDS
  172. Chapter 6 — STRUCTURAL REQUIREMENTS
  173. Chapter 7 — MECHANICAL AND ELECTRICAL REQUIREMENTS
  174. Chapter 8 — EXITS
  175. Chapter 9 — FIRE PROTECTION
  176. Chapter 10 — SUBSTANDARD BUILDINGS
  177. Chapter 11 — NOTICES AND ORDERS OF BUILDING OFFICIAL
  178. Chapter 12 — APPEAL
  179. Chapter 15.38 — HISTORICAL BUILDING CODE
  180. Chapter 15.39 — CALIFORNIA EXISTING BUILDING CODE
  181. Chapter 15.42 — CALIFORNIA MECHANICAL CODE
  182. Part II — Organization and Enforcement
  183. Chapter 15.44 — DANGEROUS BUILDINGS CODE
  184. Chapter 1 — TITLE AND SCOPE
  185. Chapter 2 — ENFORCEMENT
  186. Chapter 3 — DEFINITIONS
  187. Chapter 4 — NOTICES AND ORDERS OF BUILDING OFFICIAL
  188. Chapter 5 — APPEAL
  189. Chapter 15.46 — CALIFORNIA RESIDENTIAL CODE
  190. Division II — ADMINISTRATION
  191. Chapter 15.48 — WATER-EFFICIENT LANDSCAPE
  192. Chapter 15.50
  193. Chapter 15.52 — UNIFORM ADMINISTRATIVE CODE
  194. Chapter 15.54 — CALIFORNIA ADMINISTRATIVE CODE
  195. Chapter 15.56 — CALIFORNIA REFERENCE STANDARD CODE
  196. Chapter 15.58 — ADA STANDARDS FOR ACCESSIBLE DESIGN
  197. Chapter 15.59
  198. Chapter 15.60
  199. Title 16
  200. Chapter 16.44 — DEDICATION—PARK AND RECREATION
  201. Chapter 16.38 — DEDICATIONS AND IMPROVEMENTS GENERALLY
  202. Chapter 16.50 — AGRICULTURAL MITIGATION POLICY
  203. Chapter 16.72 — ENVIRONMENTAL IMPACT, AND GRADING AND EROSION …
  204. Chapter 16.04 — CITATION, AUTHORITY AND PURPOSE
  205. Chapter 16.12 — GENERAL PROVISIONS
  206. Chapter 16.20
  207. Chapter 16.24 — TENTATIVE PARCEL MAPS
  208. Chapter 16.28 — TENTATIVE SUBDIVISION MAPS
  209. Chapter 16.32 — ACTION ON TENTATIVE MAP
  210. Chapter 16.36 — FINAL MAP
  211. Chapter 16.38 — DEDICATIONS AND IMPROVEMENTS GENERALLY
  212. Chapter 16.40
  213. Chapter 16.42 — IMPROVEMENT SECURITY
  214. Chapter 16.44 — DEDICATION—PARK AND RECREATION
  215. Chapter 16.48 — DEDICATION—SCHOOL SITE
  216. Chapter 16.50
  217. Chapter 16.52
  218. Chapter 16.60 — MONUMENTS
  219. Chapter 16.64 — DRAINAGE, SEWER AND WATER FACILITIES
  220. Chapter 16.68 — SOIL REPORTS
  221. Chapter 16.72
  222. Chapter 16.74 — LOT LINE ADJUSTMENT
  223. Chapter 16.76 — REVERSION TO ACREAGE
  224. Chapter 16.77 — MERGER OF SUBSTANDARD LOTS
  225. Chapter 16.88 — APPEALS
  226. Chapter 16.92 — PLANNING COMMISSION
  227. Chapter 16.96 — VIOLATIONS—PENALTY
  228. Chapter 16.100 — VESTING TENTATIVE MAP
  229. Title 17
  230. Chapter 17.04 — GENERAL PROVISIONS
  231. Chapter 17.08 — DEFINITIONS
  232. Chapter 17.12 — PROVISIONS FOR FLOOD HAZARD REDUCTION
  233. Chapter 17.16 — ADMINISTRATION
  234. Title 18
  235. Chapter 18.02 — PURPOSE AND APPLICABILITY
  236. Chapter 18.16 — PLANNING DIRECTOR DECISIONS
  237. Chapter 18.12 — LAND USE AND DEVELOPMENT APPROVAL
  238. Chapter 18.58 — EMERGENCY SHELTER OVERLAY ZONE
  239. Division IV — SITE DEVELOPMENT
  240. Chapter 18.70 — FENCES, WALLS, AND SCREENING
  241. Chapter 18.80 — LIGHTING
  242. Chapter 18.88 — DENSITY BONUS AND AFFORDABLE HOUSING INCENTIVES
  243. Chapter 18.84 — WIRELESS COMMUNICATIONS
  244. Division V — DEFINITIONS
  245. Chapter 18.02 — PURPOSE AND APPLICABILITY
  246. Chapter 18.04 — ADMINISTRATIVE RESPONSIBILITY
  247. Chapter 18.06 — RULES AND INTERPRETATION
  248. Chapter 18.08 — ENFORCEMENT
  249. Chapter 18.12 — LAND USE AND DEVELOPMENT APPROVAL
  250. Chapter 18.14 — GENERAL APPLICATION PROCESSING
  251. Chapter 18.16 — PLANNING DIRECTOR DECISIONS
  252. Chapter 18.18 — PLANNING COMMISSION DECISIONS
  253. Chapter 18.20 — CITY COUNCIL DECISIONS
  254. Chapter 18.30 — ESTABLISHMENT OF ZONING DISTRICTS
  255. Chapter 18.34 — LAND USE CLASSIFICATION
  256. Chapter 18.38 — RESIDENTIAL DISTRICTS
  257. Chapter 18.42 — COMMERCIAL AND MEDICAL/PROFESSIONAL OFFICE DIS…
  258. Chapter 18.46 — INDUSTRIAL DISTRICTS
  259. Chapter 18.50 — PUBLIC/QUASI-PUBLIC AND PARKS AND RECREATION D…
  260. Chapter 18.54 — OVERLAY DISTRICTS
  261. Chapter 18.58 — EMERGENCY SHELTER OVERLAY ZONE
  262. Chapter 18.60 — GENERAL DEVELOPMENT STANDARDS
  263. Chapter 18.62 — ACCESSORY STRUCTURES
  264. Chapter 18.63 — CHILD CARE PROVISIONS
  265. Chapter 18.64 — HOME OCCUPATIONS
  266. Chapter 18.66 — SECOND UNITS
  267. Chapter 18.68 — LIVE/WORK UNITS
  268. Chapter 18.70 — FENCES, WALLS, AND SCREENING
  269. Chapter 18.72 — OUTDOOR SALES, STORAGE AND SEATING
  270. Chapter 18.73 — PUBLIC ART
  271. Chapter 18.74 — INTEGRATED DEVELOPMENT
  272. Chapter 18.76 — PARKING AND LOADING
  273. Chapter 18.78 — LANDSCAPING
  274. Chapter 18.80 — LIGHTING
  275. Chapter 18.82 — SIGNS
  276. Chapter 18.84 — WIRELESS COMMUNICATIONS
  277. Chapter 18.86 — INCLUSIONARY HOUSING
  278. Chapter 18.88 — DENSITY BONUS AND AFFORDABLE HOUSING INCENTIVES
  279. Chapter 18.89 — REASONABLE ACCOMMODATION
  280. Chapter 18.90 — TEMPORARY USES
  281. Chapter 18.92 — DRUG OR ALCOHOL ABUSE TREATMENT FACILITIES
  282. Chapter 18.94 — NONCONFORMING USES AND STRUCTURES
  283. Chapter 18.95
  284. Chapter 18.96 — LAND USE DEFINITIONS
  285. Chapter 18.98 — GENERAL DEFINITIONS
  286. Title SR
  287. § SR-2. Administration and Personnel.
  288. § SR-3. Revenue and Finance.
  289. § SR-4. Business Licenses, Taxes and Regulations.
  290. § SR-5. Animals.
  291. § SR-6. Health and Safety.
  292. § SR-7. Public Peace, Morals and Welfare.
  293. § SR-8. Vehicles and Traffic.
  294. § SR-9. Streets, Sidewalks and Public Places.
  295. § SR-10. Public Services.
  296. § SR-11. Buildings and Construction.
  297. § SR-12. Subdivisions.
  298. § SR-14. Environment.
  299. Title OL

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.