The new Pella ProLine - not just for new construction anymore. With new custom sizes in ¼-inch increments and a broad offering of standard sizes, Pella ProLine wood windows can now fit almost any size opening, making them a superior solution for any type of project - remodeling, replacement and new construction. You'll never have to compromise on quality and aesthetics again. With Pella ProLine, you get it all at a competitive price point. The beauty of wood. Our most popular design features. And virtually any size you need.