granny flat

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granny flat (plural granny flats)

1. (UK, Australia, New Zealand, informal) A dwelling detached from a primary residence, traditionally designated for a member of an extended family to live in.
   • 2023 August 5, Amy Molloy, “Hundreds build houses, granny flats and log cabins without permissions”, in Irish Independent, page 5:

     Hundreds of people have built houses, granny flats, apartments and log cabins without planning permission across Ireland in the last 15 years.

   • 2023 September 6, Michelle Cottle, “The Magic of the Granny Flat”, in The New York Times‎, →ISSN:

     AARP, the research and advocacy behemoth, has begun aggressively promoting the spread of these units, often referred to as casitas or, more cheekily, granny flats.

• accessory dwelling unit (officialese)
• casita
• secondary suite

• granny annexe