{
 "question": "Can I build a guest house or ADU on my lot?",
 "url": "https://shenandoahmiami.com/answers/adu-guest-house/",
 "answer": "It depends on the zone. Miami 21, the City of Miami's code, allows an ancillary dwelling unit (ADU) in T3-L and T3-O, not T3-R. Most Shenandoah homes are T3-R: 175 of 228 mapped sales in the 24 months to September 28, 2026. A detached ADU is capped at 10% of the lot, up to 800 square feet.",
 "short": "Not in T3-R",
 "category": "Buying",
 "dateModified": "2026-10-30",
 "dataThrough": "2026-09-28",
 "author": {
  "name": "Gatien Salaun",
  "brokerage": "Coldwell Banker Realty",
  "license": "SL3347568",
  "url": "https://shenandoahmiami.com/about/"
 },
 "attribution": "Based on information from the Southeast Florida Multiple Listing Service (SEFMLS) or from MIAMI Association of REALTORS® for the period September 27, 2022 through September 28, 2026. Data is deemed reliable but is not guaranteed accurate by the MLS and may not reflect all real estate activity in the market.",
 "table": {
  "caption": "Miami 21 ancillary dwelling unit rules, checked October 29, 2026.",
  "columns": [
   "ADU rule, City of Miami",
   "Requirement"
  ],
  "rows": [
   [
    "Zones",
    "T3-L and T3-O; not T3-R"
   ],
   [
    "Lot",
    "Must hold a single-family house"
   ],
   [
    "Maximum size, detached",
    "10% of lot area, up to 800 ft²"
   ],
   [
    "Maximum size, attached or inside the house",
    "10% of lot area, up to 500 ft²"
   ],
   [
    "Minimum size",
    "Efficiency 275 ft², 1-bedroom 450 ft², 2-bedroom 550 ft²"
   ],
   [
    "Height",
    "No taller than the main house"
   ],
   [
    "Parking",
    "1 space; none in a transit-oriented area or transit corridor"
   ],
   [
    "Entrance",
    "Separate, not facing the street"
   ],
   [
    "Ownership",
    "Same owner as the house"
   ],
   [
    "Renting it",
    "Only with current proof of homestead; predominantly permanent housing; registered and renewed yearly"
   ]
  ]
 }
}