Bob Bower, president of Archtype Structures, left, and Thom Labrie, president of Shelter + 7, stand inside Bower's Litchfield home.

Inside the great room in the home of Bob Bower, president of Archtype Structures.

Hanger brackets connect the beams in the home of Bob Bower, president of Archtype Structures.

This file photo taken April 15, 2016, shows a prototype building that was built with shell system foam panels under construction at Archtype Structures in West Gardiner.

A panoramic view, created from several photos, shows the great room in the Litchfield home of Bob Bower, president of Archtype Structures.

Home builder Bob Bower lives in this gothic style arch home in Litchfield.

A look inside a bedroom in the home of Bob Bower, president of Archtype Structures.

The prototype structure built in 2016 at Archtype Structures in West Gardiner.

Thom Labrie, president of Shelter + 7, explains how their foam-filled building panels are made during a tour Aug. 10 at Archetype Structures in West Gardiner.

Inside the great room on the second floor of the prototype building, built in 2016, at Archetype Structures in West Gardiner.

This photo shows the high-ceilinged great room on the second floor of the prototype building, built in 2016, at Archetype Structures in West Gardiner.