Heat islands: How developers are addressing thermal considerations in their development projects

Heat islands: How developers are addressing thermal considerations in their development projects

Outdoor thermal comfort is increasingly becoming a selection criterion in urban development tenders. What was still considered a mere aesthetic bonus just five years ago has now become a quantifiable technical requirement. Why? Tighter regulations, investors concerned about climate risk, and public authorities requiring proof.

For developers and urban planners, the question is no longer "Should we take heat islands into account?", but "How can we measure them, reduce them, and demonstrate the results?"

Why ICUs Are a Factor in Real Estate Projects

Regulatory pressure is mounting

Several regulatory frameworks are converging toward a requirement to incorporate green infrastructure into urban projects:

• RE2020: sets standards not only for energy performance but also for summer comfort, using the Dh indicator (degrees-hours of discomfort). Projects that cause outdoor spaces to overheat are penalized.
• European Taxonomy: The objective of adapting to climate change requires that funded projects contribute to climate resilience.
• ZAN: requires limiting impervious surfaces, the primary factor contributing to urban heat islands.

Green value becomes thermal value

Recent studies show that homes located near high-quality green spaces command a 5% to 15% premium over comparable properties in urban areas. Developers who can quantify the cooling effect of their projects stand out from the competition.

How can we measure the thermal impact of a development project?

The Initial Assessment: Assessing the Site Before Designing

Even before drawing up the site plan, it is possible to determine the thermal profile of the lot:

• Which areas are most prone to overheating?
• What percentage of the area is paved?
• What effect does existing vegetation have on surface temperatures?

This data, derived from the analysis of high-resolution aerial imagery, helps guide the design process: the layout of green spaces, the choice of paving materials, and the location of shaded areas.

Simulation: Testing Scenarios Before Building

Once the project has been outlined, thermal simulation allows for the comparison of several design options. Each scenario generates quantifiable results: surface temperature reduction, unpaved area, biodiversity (CBSh), and carbon sequestration. These indicators can be directly integrated into the RAO’s technical database.

Case Study: A Housing and Nature Reserve Project

In a mixed-use housing and nature park project developed with Netcarbon, the inclusion of 691 trees and 1,151 shrubs made it possible to simulate the effects over a 25-year period:

• -5.4°C surface temperature
• CBSh +0.4
• +52 tCO2 stored

These figures were included in the developer’s bid, serving as a key differentiator compared to competitors who merely described their plans for landscaping without providing specific figures.

ICU and green value: what buyers will be looking for in the future

The real estate market is gradually incorporating thermal data into its valuation criteria. Notaries are beginning to document the impact of summer heat on transaction prices. Insurers are adjusting their premiums based on exposure to climate risks.

In this context, a developer who can produce a thermal impact report for their project has a tangible selling point and a risk management tool.

Conclusion

The days of simply saying "we planted some trees" are over. Landowners, institutional investors, and end-users now demand proof: how much does it cool the area? What is the total green area? What is the carbon impact? Developers who incorporate these measurement and simulation tools into their design process will be the ones to win tomorrow’s bids.

CTA: 🌡️ Are you responding to a request for proposals and want to highlight your project’s thermal impact? [Try Netcarbon on your project →]