Kaizen Windows & Doors plans window replacement with low sill in Allerton around details that are harder to correct after finishing, with sealant joints kept as the lead check for this low-sill windows scope. The first control is sealant joints, and we allow a practical perimeter joint for movement and a neat external seal line. We then coordinate handle positions through sill height, glass specification, opening configuration, restrictors and internal trim and check handle height and access against the room layout and opening style, with sealant joints kept as the lead check for this low-sill windows scope. Internal Making Good is checked before closure, while reveal dimensions is included in final handover. We repair or finish internal reveals, sill zones and decoration interfaces around the new frame and check internal and external reveal depths so trims, plaster and handle clearances can be coordinated, keeping the installation focused on a low-sill installation planned around safe glazing and practical opening operation, with sealant joints kept as the lead check for this low-sill windows scope.