Archaeological monitoring was undertaken in October 2017 and January 2018 during the groundworks relating to the demolition of a garden room and erection of a new side extension (Colchester Borough Council planning application 170075). A foundation trench measuring 7.25m long x 0.6m wide was excavated to a depth of 0.9m. Five layers were recorded: modern topsoil (L1, c.0.15m thick) sealed modern demolished building remains (L2, c.0.48m thick). This in turn sealed a lens of post medieval soil/charcoal (L3, c.0.03m thick), beneath which was a layer of medieval/post-medieval buried topsoil (L4, c 0.15m thick). L4 was above natural (L5, encountered at a depth of c.0.8m below ground level). Two archaeological features were uncovered. A post-medieval brick foundation, F1, the remnants of an exterior wall of the corn mill re-built in the late 18th century which previously stood at this site, was situated along the NNE-SSW branch of the foundation trench. A number of post-medieval mortared bricks, F2, possibly the remains of a floor or internal wall, were uncovered in the WNW-ESE branch of the trench.<1>