Party wall

Semi-detached houses typically share a central party wall, which separates the adjoining dwellings.
View from southwest, East Martin Street entrance and west party wall – Barber-Towler Building (Commercial Building), 123 East Martin Street, Raleigh, Wake County, North Carolina

A party wall (occasionally parti-wall or parting wall, also known as a shared wall, common wall or demising wall) is a wall shared by two adjoining properties. Typically, the builder lays the wall along a property line dividing two terraced houses, so that one half of the wall's thickness lies on each side. This type of wall is usually structural. Party walls can also be formed by two abutting walls built at different times. The term can also be used to describe a division between separate units within a multi-unit apartment complex. Very often in this case the wall is non-structural but designed to meet established criteria for sound or fire protection, i.e. a firewall.

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