Tear Down or Renovate? A Look at the Numbers

Embodied Energy in Every Home

When we look at a home, we often only see the finished product. When we break the house down into all of its individual parts, we can begin to get a better idea of all of the energy needed to create that home. Every piece of lumber in the dwelling was cut from a tree in a distant forest, milled by energy-intensive machines, and transported long distances on diesel-powered trucks. Every brick in your walls was created by fossil fuel energy contributing to carbon emissions leading to climate change.

Thus, a standing home has a massive amount of embedded energy that makes it a livable shelter. As long as that home is standing and in use, that energy is going to good use. However, the moment that we tear down that home, we automatically throw that embodied energy away and have to start over.

The Time Needed to Offset Construction Related Climate Change Impacts

Construction teams and contractors have a vested interest in encouraging people to build new homes. For that reason, they often boast about the energetic savings that new construction techniques can offer. While sustainable building techniques have certainly improved in recent years, this does not negate the fact that there is a huge carbon footprint associated with new buildings.

For example, a new home is constructed and features high-performance insulation, increased energy efficiency, and improved indoor air quality. But, the carbon emitted by the construction of the house itself will still be too high. A report titled "The Greenest Building: Quantifying the Environmental Value of Building Reuse" gives us insight into the environmental toll new construction takes. The study found that, in many cases, replacing an older, less energy-efficient home with a new high-performance home will take an average of 80 years to offset the ecological impact of new construction. Global strategies to combat climate change focus on lowering our carbon emissions in the immediate future. We do not have 80 years left to wait for new home construction benefits to come around.

The Most Sustainable Option

Over one billion square feet of buildings are torn down and replaced each year in the United States alone. While there is growing interest in recycling and reusing building materials, most construction and demolition waste end in landfills. The EPA estimates that in 2017, waste related to construction and demolition added up to over 569 million tons. 

Carl Elefante, who is the director of sustainable design at Quinn Evans Architects, believes that the "greenest building is the one already standing." Evidence from the study referenced above and from the sheer amount of construction and demolition waste generated proves that quote to be accurate. Luckily, there is an increased number of sustainable renovation techniques and professionals in the industry today. These skilled tradespeople can convert energy-inefficient homes with low air quality into efficient, healthy dwellings that will last for a lifetime.

In the end, the decision to tear down or renovate your home will depend on your specific context, the location of your home, and the condition in which your home currently stands. However, the numbers unequivocally show that while it might make economic sense in some cases to raze your house and start over, the ecological impact of renovating is always less than building a new home from scratch. For people with a strong environmental conscience and awareness, renovating a home is usually the best and most sustainable option.