party wall
US /ˈpɑːr.t̬i ˌwɑːl/
UK /ˈpɑːr.t̬i ˌwɑːl/
1.
a wall that separates two buildings or areas of land and is shared by the owners of both properties
:
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The dispute arose over repairs to the party wall between their houses.
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Building regulations often have specific rules regarding the construction of a party wall.