A semi-detached house shares one party wall with a neighbouring property and typically has its own front and rear gardens. Across North London boroughs such as Brent, Ealing and Enfield, 1930s semis dominate residential streets and often share rear drainage runs that connect at a shared manhole before discharging to the public sewer. Drainage characteristics include a single soil stack per property, separate rainwater downpipes and a shared inspection chamber under the Party Wall etc. Act 1996 considerations. Common issues include disputes over blockages in shared sections of drain and root ingress from mature street trees such as London plane and lime. When undertaking works that may affect a neighbour's drain, a party wall notice may be required. Lateral drains beyond the boundary are maintained by Thames Water.
Semi-detached house
Pair of houses sharing one party wall, often with shared drainage runs at the rear.
