Because many design decisions drive specific construction dimensions, rough-in locations, and procurement lead times that cannot be changed after the fact without demolition and rework. Tile selection determines the shower drain rough-in elevation — a thick large-format tile mortar bed adds 1.5–2 inches the drain must account for. Cabinet layout determines blocking and nailer locations behind drywall — wrong blocking means cabinets mounted on drywall that will eventually fail. Lighting design determines recessed can locations — adding a can after drywall requires patching and repainting. Appliance selections determine utility connection locations — a gas range requires a different stub location than an electric range. These are not afterthoughts; they are construction specifications that must be resolved before the construction phase they affect. RainFire Builders builds design selection deadlines into every production schedule.