Lock House at Stenwith is a small brick-built house originally built for a canal lock keeper responsible for Lock 13 on the Grantham Canal. The canal opened in 1797 and remained in use until 1936; the British Waterways Board placed the canal in a 'remaindered' state in 1968. The lock house is likely to date to a little after the opening of the canal in 1797, and to have remained in use until the operational decline and closure of the canal in the early twentieth century. The lock keeper was responsible not only for traffic through the lock and their associated winding areas, but also for ensuring the sound working condition of the lock chamber, gates and sluice mechanisms. Accommodation close to the lock chamber was necessary, as with this lock house. This two storey house is of red brick with gable chimneys and a red clay pantile roof. Aligned roughly north-west to south-east, the building is linear in form, and of single room depth, with an off-centre doorway facing away from the canal within a gabled porch. The rear elevation has a small, canted bay window to the ground-floor room at the north-west end from which traffic on the canal approaching the adjacent lock from both directions could be observed. The building retains much of its original joinery and the interior layout of the building appears to be original with few alterations. For the full description of this listed building please refer to the National Heritage List for England. {1}