Buildings designed to withstand extreme weather may actually be more environmentally friendly than those that aren't, but current green building standards don't measure this benefit. A comprehensive review of 40 studies from Drexel University reveals a critical gap in how we calculate a building's total environmental impact, particularly as extreme weather events become more frequent and destructive.

Why Do Current Green Building Standards Miss the Climate Resilience Picture?

When architects and engineers design green buildings today, they use a process called life cycle assessment (LCA) to measure environmental impact. This method accounts for greenhouse gas emissions from manufacturing materials, construction, and operation. However, the analysis assumes buildings will continue operating normally, which increasingly isn't realistic. A new framework from Drexel shows that current standards systematically underestimate the environmental cost of fragility.

The problem becomes clear when comparing two hospitals. Under current LCA methods, a hospital designed to keep functioning during a disaster and one that isn't can end up with nearly identical environmental scores on day one. But if one goes dark for months after a storm and requires extensive rebuilding while the other keeps running, that massive difference in environmental impact never shows up in how we measure their sustainability.

"If we truly want to reduce the environmental impact of building construction and operation, which currently accounts for more than a third of global greenhouse gas emissions, it is vital that we look at the full picture," said Fernanda Cruz Rios, assistant professor in the School of Engineering at Drexel University's Nick Howley College of Engineering and Computing.

Fernanda Cruz Rios, Assistant Professor, Drexel University

What Gaps Did Researchers Find in Resilience Measurement?

Cruz Rios conducted a systematic review of 40 studies examining building resilience through the lens of life cycle assessment. The research examined four main categories of extreme weather threats:

• Seismic Activity: Earthquakes and ground movement that can damage structural integrity and building systems.
• Heat: Extreme temperatures that can compromise building materials and increase cooling demands.
• Flooding: Water damage that can destroy interior systems, materials, and require extensive rebuilding.
• Wind: High-speed winds from storms that can damage roofs, walls, and external structures.

Although all 40 studies addressed some form of resilience, most failed to quantify key aspects related to building inoperability. These gaps include measuring what it takes to make a building robust against extreme weather, such as using stronger materials or building redundancy into systems, and calculating how quickly and with what resources a building could resume operation after an event.

How Can Designers Account for Resilience in Environmental Impact?

Cruz Rios created a new framework that factors in both the environmental costs and benefits of resilience. This model allows designers to weigh the relative cost of building durability against the cost of inaction. The framework captures several key elements:

• Compensatory Services: Environmental costs of temporary shelter, emergency fuel, and evacuation transportation deployed while a building's operation is being restored.
• Resilience Design Costs: Additional environmental impact of designing a building to withstand extreme weather, such as reinforced concrete walls or backup power systems.
• Post-Event Modifications: Resources needed to improve a building's resilience after an event has occurred.
• Avoided Damage Credits: Environmental benefits of preventing damage that would otherwise require complete rebuilding, gutting, or extensive reconstruction.

For example, a building that doesn't need to be gutted and rebuilt after a flood never accrues the environmental cost of that rebuild in the first place. Under Cruz Rios's model, that avoided cost counts in the building's favor, providing a more accurate picture of its true environmental footprint.

"These knowledge gaps point to the fact that these assessments are conducted assuming that the building will continue to be operational. The environmental cost of fragility has systemically been underestimated," explained Cruz Rios.

Fernanda Cruz Rios, Assistant Professor, Drexel University

What's the Path Forward for Adoption?

The next step for broad adoption of this expanded model would be formal incorporation into environmental design rating systems such as Leadership in Energy and Environmental Design (LEED), the National Green Building Standard, or Green Globes. These standards often come with tax credit incentives for buildings that achieve them, making their influence significant across the construction industry.

Cruz Rios emphasized that this isn't a replacement for existing design practices. Instead, it's a set of modules that plug directly into the life cycle analyses designers already run when a building is designed. Adoption into formal standards will likely take time, but designers are already noticing this gap and seeking ways to prove that building for durability is also building sustainably.

As extreme weather events continue to increase in frequency and severity, the ability to measure and credit resilience in environmental impact calculations could reshape how buildings are designed and evaluated. The research suggests that what we've long called "sustainable" building may need to be redefined as "durable" building, where a structure's ability to survive and quickly recover from climate impacts becomes as important as its operational efficiency.