Keep buildings small and compact so they need less energy to heat (or cool) and use fewer materials.
Build in a modular style so building components can be reused if the building is damaged or dismantled.
Use pre-fabricated sections that are made off-site to save energy of transporting equipment and people to site.
Place large double or triple glazed windows toward the sun (south in the northern hemisphere).
Have fewer, smaller windows on the side of the building that gets less light and heat (north in the northern hemisphere).
Consider the direction of winds and place a low pitched (rising) roof on the side of the building that is likely to get cold winds or use trees or walls carefully to direct the wind over the building.