Four Insights from the Most Successful NZE Home Builders

The number of net-zero energy (NZE) homes in the US is growing at an exciting rate (it has grown by 33 percent from 2015 to 2016), but this growth is nowhere near fast enough to make NZE homes mainstream. Today, they are a very niche offering, comprising roughly 0.01 percent of US residential housing stock. To increase market penetration of NZE homes, we need to learn how first movers can successfully break into this new market and understand what barriers still need to be addressed to make NZE homes mainstream. Rocky Mountain Institute (RMI) interviewed eight of the most successful NZE builders, responsible for 20 percent of the single-family NZE homes in the US, to understand what they know about NZE homes that the rest of the industry should learn. Here’s what we found out:

Insight 1: NZE Homes Can Be Economical Today

Looking at a home in terms of total cost of ownership (mortgage, utilities, property taxes, etc.), an NZE home is more cost-effective than a standard-efficiency home today if designed correctly. For this to be true, builders need to take an integrated approach and look at the home holistically instead of taking an add-on approach. For example, builders of a home that requires more insulation could offset some of that incremental cost by downsizing its heating and cooling system. Additionally, a roof optimized for solar would have simple planes, as opposed to the typical gingerbread-house profile, lowering the roof cost and reducing the incremental cost to build an NZE home. Also, while most builders we spoke with didn’t build in California, they believed California’s NZE code requirement, slated to take effect in 2020, will further drop the cost to build NZE homes since it will increase the market for NZE equipment, and manufacturers will need to offer cost-effective solutions there if they want to remain competitive.

Although builders consistently told us the cost to own an NZE home pans out over the life of the mortgage, RMI wants to push that idea further. We know NZE homes cost less than most people realize, but our research will provide clarity on roughly how much a well-designed NZE home costs to build and how long homeowners need to remain in their NZE homes to break even on their investments.

To learn more about RMI’s NZE homes cost research and stay posted on the results, click here. The full report will be released in July.

Insight 2: Customer Acquisition and Market Barriers Should Also be Addressed to Scale NZE Homes

Many builders we spoke with shared a common customer-communication journey when they started offering NZE home construction. Initially, they tried to train homebuyers to be building scientists, which was not a successful strategy. Now, they primarily talk about healthy and comfortable homes and more disposable income. One builder even calculated all the energy savings from residing in an NZE home for a young family, and equated it to paying for their young child’s college education. The NZE builders we spoke with all seemed to have their customer pitch down, but it was a learning process, because they were first movers, that resulted in a lot of trial and error.

In addition to the customer acquisition barrier most new NZE builders need to work through, there are market barriers to NZE homes that, if addressed, NZE builders believed could significantly increase adoption of NZE homes. Two of these market barriers are that energy costs aren’t currently factored into the mortgage underwriting process and that energy costs aren’t transparent to most homebuyers. If NZE homes could get more favorable lending terms because they have lower debt-to-income ratios than identical homes that are standard efficiency, it could help NZE builders significantly. Additionally, if energy costs were more visible, such as incorporating Home Energy Rating System (HERS) scores into the multiple listing service (MLS), it would make energy a bigger part of the conversation when people are choosing a home and increase the market differentiation of an NZE home. Many organizations, including RMI, are actively working to break down these market barriers.

Insight 3: Changes in Labor Open New Opportunities

The shortage in building-trade labor is a growing problem that hit an all-time high in 2017, with 64 percent of builders saying they experienced a subcontractor labor shortage. These shortages are leading to 74 percent of builders raising home prices, 72 percent of builders having difficulty completing a project on time, and 35 percent of builders turning down some projects. While this is a huge problem for the construction industry, it also creates a big opportunity for builders and subcontractors that take a different approach to home construction. Structural insulated panels (SIPs) and prefabricating building envelopes off-site are two ways to address this labor shortage because they require significantly less time on-site. These construction practices can also result in better-performing homes since these practices typically result in tighter and more insulated homes.

Many NZE builders struggled with subcontractors that were stuck in their old ways and would charge a significant premium if they tried to do something new on a home. The significant labor growth required in this field creates an opportunity to leapfrog old building practices and establish a new business-as-usual in the workforce. For subcontractors, learning these new high-performance building practices is an opportunity to differentiate themselves with forward-looking builders. Most NZE builders we spoke with worked with the same subcontractors on all their projects because they went through the learning curve together.

Insight 4: Building NZE Homes Is Less Risky than Building Standard Homes

NZE builders felt their differentiated offering helped them during market downturns and reduced their risk when a new energy code was adopted. Since the homes they build will always be more efficient than the energy code, they don’t need to scramble to learn the new code or worry about rising construction costs. And differentiation reduces risk, too. “The greatest risk of all is to be just like any other builder. A highly differential, crisp product has been a real key to our survival through the recession,” said Gene Myers of Thrive Homes. Interestingly, these trends are consistent with those witnessed in the commercial NZE sector, as noted in RMI’s recently published guide detailing best practices for NZE commercial leases.

What’s Next?

Leading NZE builders, designers, technology providers, government officials, and thought leaders will gather in Pittsburgh at the Getting to Zero National Forum, April 17–19 to discuss these and other trends driving the NZE industry forward to the benefit of communities, our economy, and our climate. You can still join us by registering here.