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


Since 1946, Union Corrugating has been a leading metal roofing manufacturer, providing metal roofing products and wall systems for residential and commercial buildings.  As a leading metal roofing...


Homeowners find EcoTouch® PINK® FIBERGLAS™ Insulation with PureFiber® Technology fast and easy to install. In addition, EcoTouch® insulation:Delivers comfort – helps homes stay cooler in the summer...


ENERGY STAR Performance RatingsAndersen makes windows and doors that meet ENERGY STAR® performance requirements in all 50 states, and Andersen Corporation earned the 2013 ENERGY STAR Sustained Excellence...