Penn Windows, Doors & Siding has been servicing the Lehigh Valley since 1948. Penn is a local family owned and operated business focused on supplying Allentown, Easton, Bethlehem, and the surrounding areas with top quality products and great customer service. We specialize in custom vinyl windows, custom steel and fiberglass doors, storm doors, sliding patio doors, and vinyl siding. We install everything we sell, giving our customers a 10 Year Workmanship and Service Warranty in addition to all manufacturers’ lifetime warranties. Call us for a free in-home consultation 6 days a week or visit our showroom at 1518 Union Boulevard in Allentown, PA 18109.