This post is part of our definitions series on “eco-lingo” and technical terms.

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I am not (and have never been) a Bay Area homeowner, which is perhaps why I was not very familiar with the term “RECO” until recently.

There are many well-publicized programs aimed at making new buildings as “green” and energy efficient as possible. These efforts are viewed as integral to efforts to reduce future energy use and combat climate change. But in many places, we’re mostly stuck with the buildings that we’ve got. And we’ll likely be stuck with them for many years to come. So how do we influence and improve the energy and water performance of these buildings? One answer is a RECO.

Residential Energy Conservation Ordinance (RECO)

The purpose of a RECO is to improve the energy (and now water) efficiency of housing stock at the point of sale and major renovation.

In Berkeley, CA, the majority of the housing stock was built before the introduction of state building energy codes.  The buildings are often drafty, with no insulation and single-pane windows. Further, more than half of the city’s housing units are occupied by renters. In rental units landlords must approve and often conduct and pay for any major energy retrofits. However, the retrofits primarily benefit the renters, who pay the utility bills. Because of these split incentives, an obvious point of intervention to improve the energy efficiency of the existing building stock over time is at transfer of ownership or major renovation. The Berkeley RECO, which has been in place since the 1980s, applies to all residential homes and units, whether single-family homes, condos, multi-family properties, or live-work spaces, and requires that the home or unit comply with specific energy and water performance measures at the time of sale or major renovation.

The Berkeley RECO has ten prescriptive measures covering toilets, showerheads, faucets, water heaters, hot and cold water piping, exterior door weather-stripping, furnace ducts, fireplace chimneys, ceiling insulation, and lighting in common areas (for multi-family buildings).

It is tempting to say the measures are not enough, that much more drastic intervention (and more quickly) will be needed to achieve dramatic energy savings. This is probably true. But many approaches will be needed, and the gradual but consistent improvement of existing housing stock is a good place to start.

Since 1994, Berkeley has also had a Commercial Energy Conservation Ordinance (CECO).

Participants in Berkeley FIRST (Berkeley’s solar financing program) have to comply with RECO/CECO.

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What exactly does “sustainability” mean? How about “green”, “eco” or “environmentally friendly”? The truth is that these terms are just vague enough to mean many different things to many different people. With the staggering array of “green” products, ‘lifestyles’ and concepts being promoted by marketers and environmentalists alike (as well as the necessary coining of new terms to match new ideas) our definition series aims to make sense of the rising tide of “eco-lingo” and technical terms.