SLIDING WINDOWS from Pella® of Haverhill From smooth curves to striking angles, Pella Windows and Doors Special Shape windows offer nearly endless design possibilities and help you achieve a distinct look at a competitive cost. Special shape windows are made in curves and angles to increase the architectural interest and natural light in your house. Our windows allow you to combine various shapes, sizes and styles to make a stunning focal point. Special shape windows can be made with grille patterns that match our other windows so you’ll have a quality, uniformlook throughout your home. Made in a variety of sizes, these factory-assembled window combinations will forma custom look using standard windows. If you don’t see the shape you had in mind, please refer to our Custom Windows. Pella Windows and Doors can create virtually any window shape or size you may want.Schedule an in-home consultation or visit the showroom in Haverhill to learn more. Schedule Now!