Report for a programme of archaeological monitoring and recording conducted during groundworks for the construction of two new residential dwellings on land to the rear of 20, King Street, Market Rasen. The monitoring identified the east-west orientated line of a possibly medieval linear boundary ditch, which may have defined the boundary of two medieval burgage plots which fronted onto the northern side of King Street. The ditch was very shallow and heavily truncated. No finds or further archaeological features were identified.