Eco-friendly construction / Discussions

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Just wondering if building a prefabricated building that is more energy efficient than a similar counter part that is less efficient would take longer to build? The difference in the time it would take to build an energy efficient Prefab Home compared to a code-built less efficient home would be negligable. Any company...

The grade on the building site drops 8 feet over 72 feet. Is it feasible and cost effective to build three slab foundations that step down in order to deal with the slope. The top foundation would be a for a single story 15 by 24 room. The next level would be a 24 by 24 two story structure and the garage would be at th...