Doors & WindowsSuppliers, Distributors & Wholesalers

Windows and exterior doors reach contractors through three overlapping channels: manufacturer-direct dealer programs (Andersen, Pella, and Marvin all run branded dealer networks), one-step distributors selling multiple lines to lumber yards and specialty window dealers, and the millwork desks inside pro lumber dealers, which is where most production builders buy. Interior doors typically come pre-hung from the lumber dealer's door shop, which machines slabs to order. Big-box special-order desks serve remodelers on entry-level vinyl lines. Because nearly everything is built to order at specific sizes, the dealer relationship centers on accurate ordering rather than on-shelf stock.

Windows price per unit by size, series, and options, with grids, glass upgrades, exterior color, and impact ratings each adding cost, so a quoted opening schedule is the only meaningful comparison between suppliers. Entry doors price per prehung unit; interior door packages price per opening. Dealer accounts carry net-30 terms, and builder programs add volume rebates on annual purchases. Lead times define this category: standard vinyl runs two to five weeks in 2026, fiberglass entry units similar, while custom-color aluminum-clad and impact-rated products stretch to eight weeks or more, so ordering at framing start is standard discipline.

Vet a window supplier on order accuracy and after-sale service, because a wrong-handed window discovered at install is a multi-week schedule hit no discount recovers. Ask who field-verifies rough openings, how they handle freight damage claims, and whether they stock service parts like sash, balances, and hardware locally. Confirm units carry NFRC labels with the U-factor and SHGC your energy code requires, and design-pressure or impact ratings where wind zones demand them. A dealer with an in-house service tech who will come out for a warranty sash swap two years later is worth more than the lowest bid from an order-taker.