Australian architect and artist Mathieu Gallois working with several groups described the negative environmental consequences of McMansions:
The project organisers made the following conclusions about McMansions: “the brick veneer construction’s thermal performance is poor and inappropriate for Australia’s hot climatic conditions; the foundations are laid on a large concert slab that possess high levels of embodied energy; the terracotta tiled roof’s thermal performance is poor and inappropriate for the Australian climate; the aluminium window frames have a high level of embodied energy and their thermal performance is poor; the window glazing is of a poor level, as is its thermal performance; the PVC plumbing has a high embodied energy; the steel lintels have a high embodied energy and represent lazy design solutions”.
On this basis they argued that “Australian brick veneer homes are the biggest and most poorly designed built homes in the developed world; too big, not built to be recycled, not responsive to climatic conditions, not built for future adaptability, with poor cross ventilation. Moreover, such houses are designed to face the street rather than being orientated to maximise the site’s positive climatic engagement; their multi-faceted roofs do not optimise or facilitate the provision of PV panels or solar HWS; their roofs do not harvest rainwater; the stairwells are not sealable; and the rooms and living spaces are generic, unresponsive to different seasonal climatic conditions”.
That is a negative assessment, particularly compared to how homes might be constructed in a greener manner.
Just thinking about these negative environmental consequences, I wonder if it is possible to create a greener McMansion that roughly keeps the size, architecture, and price that a decent number of Americans and Australians are willing to buy. Could strategic choices be made to make a significantly greener home without too many alterations? This would provide a different product and help address concerns some might have about McMansions.