For this pre-decoration windows project in Bidston, opening checks, frame fitting and finishing are treated as one sequence. Frame Position leads the review, so we set the new frame at a position that works with the reveals, sill and external finish. We use packers and thermal junctions around internal reveals, trims, plaster repairs, sealant and decoration order, ensuring we support the frame at suitable points so fixing does not pull it out of line and coordinate the frame perimeter with insulated reveals or cavity details to limit avoidable cold bridging, with frame position kept as the lead check for this pre-decoration windows scope. The last technical check is internal making good; we repair or finish internal reveals, sill zones and decoration interfaces around the new frame, with frame position kept as the lead check for this pre-decoration windows scope. This supports window installation handed over ready for the planned internal finishing stage.