For this thermal-upgrade windows project in Sefton, opening checks, frame fitting and finishing are treated as one sequence. Hardware Adjustment leads the review, so we adjust hinges, handles and locking hardware after glazing so operation remains smooth, with hardware adjustment kept as the lead check for this thermal-upgrade windows scope. We use opening survey and fixing points around glass specification, frame perimeter, cavity interface, seals and internal reveals, ensuring we check the existing opening, frame position and surrounding finishes before final dimensions are confirmed and position frame fixings to suit the opening, frame profile and surrounding substrate, with hardware adjustment kept as the lead check for this thermal-upgrade windows scope. The last technical check is sealant joints; we allow a practical perimeter joint for movement and a neat external seal line, with hardware adjustment kept as the lead check for this thermal-upgrade windows scope. This supports replacement glazing with the frame perimeter and surrounding junctions coordinated for thermal continuity.