We are the Midwest’s only provider of quality Custom Built Room Additions for Mobile and Modular Homes. We serve the four state area including Missouri, Arkansas, Kansas and Oklahoma. Addon Rooms also builds and installs custom turnkey modular buildings for churches, businesses and schools as well as a variety of storage buildings designed to fit your needs. Our skilled team of designers, builders and installers provide our clients with superior customer support and service. From the very first planning meetings all the way to the delivery and installation of their product, our clients are our primary focus. We have been building custom factor built mobile home additions and modular buildings since 1969! Hundreds of families have depended on us to help them expand their homes to meet their growing needs. Let us give you a free quote today. We look forward to talking with you and helping to make your home dreams come true.