Guaranteed Builders

We offer a variety of commercial services to meet the needs of our clients. Through years of commercial construction experience, GBI offer the most complete set of services to meet your needs. We are able to provide general contracting, construction management, and design/build services to a broad spectrum of clients, both public and private. Our design/build project delivery method provides a single source of responsibility. From planning, design, and construction services, GBI has everything you need.

GBI has been providing Massachusetts Title 5 septic system services since 1980. These services include new septic installations, septic repair, leachfield installations, Title 5 inspections, sewer extensions and more. Through the years we have developed a reputation of providing quality workmanship, service and competitive pricing combined with the highest integrity. All residential, commercial and industrial sewer, septic system and Title 5 inspection services available. From construction in our manufacturing facility to utilizing our own heavy equipment and our staff of skilled trades people.

What sets Guaranteed Builders apart from other builders is our focus on quality and customer service. Our business is built on delivering a superior product and a superior customer experience through our Complete Solution approach. We utilize only high quality modular components. We carry the full line of Excel Modular Homes and Professional Building Systems, premier constructors of high quality homes in the US. In addition we also utilize our own manufacturing facility to build high quality custom modular components and panels.

Since we can customize any home to meet your needs, you are getting a custom built home with all the quality and time saving benefits of modular construction. Unsure about modular homes? Visit Why Choose Modular Homes to learn the many benefits. From construction in our manufacturing facility to utilizing our own heavy equipment and our staff of skilled trades people.

GBI Avis is a full service garage builder based out of Douglas, Massachusetts. There are several models to choose from and each can be built as a detached or attached concept to your home including with or without breezeways. And of course each garage can be customized to suite your needs. The designs are for a standard 24' x 24' but can be built to any size you desire. We can also design and build your garage to accommodate larger vehicles, boats or a car lift. As with our modular homes, our garages are built with our Complete Solution Approach.