Custom windows and doors are coordinated products, not off-the-shelf cartons. The lead time starts when the opening information is usable and continues through design approval, material confirmation, production, quality checks, packing, and delivery. Understanding the sequence helps the rest of the project plan around realistic milestones.
Measurement and design confirmation come first
Site dimensions, drawings, opening directions, glass specification, hardware, colors, and installation details need to be reviewed before manufacturing can be released. Late changes to size or configuration can affect drawings, material ordering, and the production slot.
Approvals protect the schedule
Confirm the final shop drawings, finish samples, glass appearance, handle position, screen type, and packing labels. A clear approval record prevents a good product from being delayed by a small unresolved decision.
Production includes more than assembly
Profiles and accessories may need to be prepared, cut, machined, assembled, glazed, adjusted, and inspected. Custom glass and special finishes can follow different supplier timelines. Quality checks and protective packing are important steps before a shipment leaves the factory.
Build in delivery and site coordination
Confirm the delivery address, unloading equipment, access windows, floor level, storage conditions, and installation sequence. Allow time for customs or local transport where applicable, and avoid scheduling the installation before the opening is weather-tight and ready to receive the frames.
Next step: Set the desired installation date first, then work backward through measurement, approvals, production, packing, and delivery with a clear responsibility for each milestone.