For this cottage-style windows project in Brierfield, opening checks, frame fitting and finishing are treated as one sequence. Opening Configuration leads the review, so we confirm fixed and opening sections against ventilation, access and furniture or worktop positions, with opening configuration kept as the lead check for this cottage-style windows scope. We use internal making good and frame position around mullion positions, opening lights, glazing bars, frame proportions and hardware, ensuring we repair or finish internal reveals, sill zones and decoration interfaces around the new frame and set the new frame at a position that works with the reveals, sill and external finish, with opening configuration kept as the lead check for this cottage-style windows scope. The last technical check is perimeter sealing; we form a continuous weather-resistant seal around the external frame perimeter, with opening configuration kept as the lead check for this cottage-style windows scope. This supports a more traditional visual arrangement delivered through a low-maintenance uPVC window system.