Welcome to McCormack Building Supply

Welcome to McCormack Building Supply.  We have been serving homeowners and contractors with quality building materials since 1979.  We are family owned and operated and service central Maine and beyond from our Winslow location.  We offer drafting and design services that provide you with a complete set of blueprints.  We offer free on-site estimating, kitchen and bath design and free delivery!  Our friendly and knowledgeable staff is here to help you through all phases of your project.   

"Excitement is Building"  This is our tagline and we think it says it all.  We are excited about our industry and the projects we are part of.  Building a home, addition, garage, deck and/or renovating a space is one of the most exciting times in a person's life and we are proud to be part of your experience.  

Product Spotlight


Maine Deck Bracket®What is a MAINE Deck Bracket ? Our Products provide a  Revolutionary method of attaching Decks, Stairs, Signs and other appendages to buildings . Maine...


The Endurance Railing family is our national bestseller when it comes to outdoor stair railings; thanks to sound engineering that enables easy and safe installations. Our railings are manufactured using...


Ella’s Bubbles – a Chicago-based OEM manufacturer and distributor of acrylic walk-in bathtubs and accessible showers – has spearheaded acrylic walk-in bathtub development, production, and distribution...