Sustainability Standards for Homes
If you’re building or renovating a home, you’ve probably heard about LEED, Passive House, Built Green, and ENERGY STAR. All of these certification programs can ensure a more sustainable home—but they are not the same thing, and getting a certification isn't automatically worth the extra cost. Here's an overview of each one.
ENERGY STAR is primarily an energy-efficiency program. Certified homes must meet rigorous requirements for insulation, windows, air sealing, HVAC systems, water management and other building components, with independent testing and verification. ENERGY STAR says certified homes are at least 10% more efficient than homes built to code and average about 20% better.
Cost: $1,000 - $5,000, mainly for energy modeling, testing, and documentation. Little to no construction premium.
Benefits: Lower energy use, better comfort, improved durability and third-party verification that the home was actually built to perform as designed, wide recognition helps with resale value. ENERGY STAR rated appliances are typically eligible for utility rebates.
Bottom Line: For a homeowner primarily interested in energy efficiency and comfort, ENERGY STAR is one of the easiest certifications to justify.
Built Green is the green-building certification program of the Master Builders Association of King and Snohomish Counties. It is particularly relevant to homeowners in the Seattle area because it was developed specifically for the Pacific Northwest. Unlike ENERGY STAR, Built Green looks beyond energy to include issues such as water conservation, materials, site impacts, indoor air quality and resource efficiency. Built Green has different levels of certification, allowing homeowners to decide how far they want to go.
Cost: $2,000 - $8,000 for program fees, inspections, documentation, small construction premium.
Benefits: A more comprehensive approach to sustainability, along with measurable energy and resource savings. Higher resale value potential.
Bottom Line: For a Seattle-area homeowner who wants a genuinely greener home without going to extremes, Built Green may offer the best overall balance.
USGBC LEED Residential-in addition to energy it considers water, materials, indoor environmental quality, location, site design, durability and other aspects of sustainability. It also uses independent third-party verification. A LEED Platinum home uses less energy than a home designed to the already restrictive Washington Energy Code.
Cost: $8,000 to $35,000- considerably more expensive and administratively involved than ENERGY STAR or Built Green because of additional documentation, modeling and verification.
Benefits: A comprehensive sustainability framework, third-party verification and a recognizable certification that can potentially contribute to marketability and resale value.
Bottom line: LEED makes the most sense if you want to address sustainability broadly—not just energy—and you value having a nationally recognized certification to prove it.
Phius—the North American Passive House standard—is different from the other programs. Rather than simply checking off a list of green features, it focuses heavily on how the building actually performs. Phius emphasizes a highly insulated and airtight building envelope, high-performance windows, minimized thermal bridging, optimized solar gain and balanced ventilation with heat recovery. Passive buildings can achieve 40–60% energy savings compared with conventional buildings. The tradeoff is that achieving this level of performance generally requires more design attention, energy modeling and construction quality control.
Cost: $10,000 to $30,000- certification fee plus consultant, rater, verifier, testing, design support, plus any construction premium
Benefits: Exceptional comfort, very low energy use, excellent indoor air quality, resilience and a very high-performing building envelope.
Bottom line: If energy performance, comfort and long-term operating costs are your top priorities, Phius is probably the most effective option—but it requires a more committed design and construction process.
But there is a fifth option: take the best ideas from these programs and incorporate them into your home without pursuing certification. In many cases, spending money on better insulation, airtight construction, high-performance windows, efficient mechanical systems and thoughtful passive design will provide homeowners with more tangible benefits than spending that same money simply to earn a plaque.
If your priority is to build a home that saves on energy costs and reduces impacts to the environment, the goal shouldn't be to own a certified green home. The goal should be to own a home that performs better.
