This report presents the results of a two-year research program to monitor and evaluate the performance of earth masonry in modern wall construction. The program made a detailed study of one new building through the complete construction process, including design, procurement and occupation. It also took into consideration several other projects that used these materials. The earth materials studied in this project, earth bricks, mortars and plasters, are generally held to have good environmental characteristics over a range of important criteria and, critically, are also believed to have wide potential for use in contemporary construction.