Every building constructed today will still be standing in fifty years. That's fifty years of heating, cooling, and electricity bills locked in by decisions made during a few months of construction. So you'd think we'd build them as efficiently as possible, right?

The reality is stranger. Most building codes require the bare minimum of energy efficiency, even when better options would pay for themselves in a couple of years. We're literally writing rules that force us to waste energy for decades. Understanding why this happens—and how to fix it—reveals a lot about how markets, regulations, and incentives shape our environmental future.

Consider insulation. Adding a few extra inches to the walls and roof of a typical home might cost an additional $2,000 during construction. That same upgrade can cut heating and cooling bills by $1,000 or more per year. The math is remarkable—the investment pays for itself in about two years, then delivers savings for the next fifty.

Yet most building codes don't require this level of insulation. They set minimum standards that were written years ago, often based on outdated assumptions about energy costs and materials. Builders meeting these minimums are legally compliant, but they're leaving enormous value on the table for future occupants.

Environmental economists call this an efficiency gap—when clearly profitable investments don't happen. It's not because the technology is missing. Better windows, heat pumps, and insulation are all available today. The gap exists because our rules don't require them and our markets don't reward them.

Takeaway

When something pays for itself in two years and keeps paying for fifty, but nobody does it, the problem isn't the technology. It's the system deciding who benefits and who pays.

Here's the puzzle: if efficient buildings save money, why don't builders make them? The answer is beautifully simple and deeply frustrating. Builders pay the construction costs. Owners pay the energy bills. These are almost never the same person.

A developer building a hundred homes has one goal: sell them at a competitive price. Spending an extra $10,000 per unit on efficiency features that don't show up on the sticker means those homes cost more than the competitor's next door. Buyers, meanwhile, often can't easily see or compare energy performance. They notice granite countertops, not wall insulation.

This is a classic case of what economists call split incentives. The person making the decision doesn't experience the consequences. It happens in rental properties too—landlords choose the appliances, tenants pay the electricity. Without a mechanism to align these interests, the market systematically underinvests in efficiency, even when the total economic benefit is enormous.

Takeaway

Markets fail not because people are irrational, but because the person choosing and the person paying are often different people. Fix that mismatch, and behaviour changes.

Traditional building codes are prescriptive—they tell you exactly what to do. Use this thickness of insulation. Install windows with this rating. Follow this checklist. This approach is easy to enforce but terrible for innovation. If a builder discovers a clever new method that outperforms the code, they might not even be allowed to use it.

A better approach is performance-based standards. Instead of dictating materials, these codes set a target: the building must use no more than a certain amount of energy per square metre. How you get there is up to you. Want to use thick insulation? Great. Prefer advanced heat recovery ventilation? Also fine. The rule cares about outcomes, not methods.

Countries like Germany and jurisdictions like California have moved toward performance standards, and the results are striking. Innovation flourishes when builders can experiment. Costs drop as new techniques scale. And crucially, the standards can be tightened over time without rewriting hundreds of technical rules—you just lower the energy target.

Takeaway

Regulate outcomes, not methods. When you tell people what to achieve rather than how to achieve it, innovation does the rest of the work for you.

Building codes seem like dry, technical documents. But they quietly shape trillions of dollars in energy consumption and billions of tonnes of emissions over the coming decades. Getting them right is one of the highest-leverage environmental policies we have.

The path forward isn't complicated. Align incentives so those making decisions face the consequences. Shift from prescriptive rules to performance targets. Update standards to reflect current economics, not those of the 1980s. Small regulatory changes here compound into enormous gains.