granny flat: meaning, definition, pronunciation and examples
MediumInformal
Quick answer
What does “granny flat” mean?
A self-contained living unit within or attached to a single-family home, often occupied by an elderly relative.
Audio
Pronunciation
Definition
Meaning and Definition
A self-contained living unit within or attached to a single-family home, often occupied by an elderly relative.
Any small, secondary, self-contained residential unit on the same property as a main house, used for family members, guests, or rented out. The term can also be used euphemistically for such units regardless of the occupant's age, though the core implication of housing an elderly relative remains strong.
Dialectal Variation
British vs American Usage
Differences
Commonly used in both varieties, but 'granny annexe' is a frequent British alternative. In American English, 'in-law suite' or 'accessory dwelling unit (ADU)' are more formal/legal equivalents, though 'granny flat' is widely understood.
Connotations
In both, it suggests informal, family-oriented use. In UK planning contexts, 'annexe' is more official. In US, 'ADU' is the technical term.
Frequency
Slightly more common in British English as a colloquial term. In American English, regional alternatives like 'mother-in-law apartment' are also frequent.
Grammar
How to Use “granny flat” in a Sentence
They built a granny flat for X.The granny flat is attached to X.X lives in the granny flat.Vocabulary
Collocations
Examples
Examples of “granny flat” in a Sentence
verb
British English
- They decided to granny-flat the old garage. (Informal, rare as verb)
American English
- They are granny-flatting their basement to generate income. (Informal, rare as verb)
adjective
British English
- The granny-flat conversion added value to the property. (Attributive use)
- They sought granny-flat planning advice.
American English
- The city's new granny-flat ordinances are more permissive.
- They built a granny-flat addition.
Usage
Meaning in Context
Business
Used in property listings, construction, and real estate development (e.g., 'Home features a valuable granny flat with rental potential').
Academic
Rare; more technical terms like 'accessory dwelling unit' or 'multi-generational housing' are preferred in sociology or urban planning papers.
Everyday
Common in family discussions, housing plans, and informal descriptions of properties.
Technical
In architecture and planning: 'ADU' (Accessory Dwelling Unit) or 'ancillary accommodation'. 'Granny flat' is considered colloquial.
Vocabulary
Synonyms of “granny flat”
Strong
Neutral
Weak
Vocabulary
Antonyms of “granny flat”
Watch out
Common Mistakes When Using “granny flat”
- Using 'granny flat' to refer to a room inside the main house (it must be self-contained).
- Capitalising it as a proper noun (it is not typically capitalised).
- Using it in very formal writing where 'ADU' or 'annexe' would be better.
FAQ
Frequently Asked Questions
No. While the name suggests it, a granny flat can house any relative, a guest, or even be rented out to a tenant. The term emphasises the type of accommodation more than the occupant.
A granny flat is legally and physically subsidiary to a main house on the same property. A bedsit/studio is usually a separate dwelling in a larger building like a block of flats.
No, it is a colloquial term. Legal and planning documents in the UK use 'annexe' or 'ancillary accommodation', and in the US use 'Accessory Dwelling Unit (ADU)' or 'secondary suite'.
Yes. While often attached or converted from part of the house (like a garage), a granny flat can also be a small, separate building in the garden.
A self-contained living unit within or attached to a single-family home, often occupied by an elderly relative.
Granny flat: in British English it is pronounced /ˌɡræni ˈflæt/, and in American English it is pronounced /ˌɡræni ˈflæt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No specific idiom. The term itself is a fixed compound.]”
Learning
Memory Aids
Mnemonic
Imagine a GRANNY living in a FLAT that's flat (level) with the garden, right next to the main house.
Conceptual Metaphor
CONTAINER FOR FAMILY (The flat is a container providing care and proximity within the family unit.)
Practice
Quiz
In which context would the term 'granny flat' be LEAST appropriate?