Turning Data into Decarbonisation: How Engineering Drives Sustainable Innovation in Real Estate

The real estate sector stands at the crossroads of climate change and technological transformation. In Switzerland, buildings account for approximately 40% of the country’s total end energy demand and are responsible for around a quarter of all CO₂ emissions. These figures underscore the urgency for action-and the opportunity to drive meaningful impact, like turning data into decarbonisation.

At the same time, the landscape is shifting fast. New regulatory frameworks, such as FINMA’s circular on Nature-related financial risks, are placing greater expectations on financial institutions and property owners to disclose and mitigate their environmental impact. Sustainability is no longer a peripheral concern – it’s a central pillar of responsible asset and risk management.

IAZI has long recognised the strategic importance of sustainability in real estate. From the company’s founding, sustainability has been integral to the valuation philosophy. Over the past five years, they’ve doubled down – developing state-of-the-art software tools that help their clients navigate the complexities of sustainability regulation, improve their energy performance, and reach their CO₂ reduction targets.

And just as importantly, we equip our clients with the knowledge and digital tools they need to help motivate property owners to renovate their homes, improve energy efficiency, and reduce emissions across the Swiss housing stock.

Reducing CO₂ emissions in real estate portfolios is a data-driven challenge-but the data isn’t always easy to get. The availability and quality of building data vary widely, making precise estimation difficult. Every building is unique, with its own set of characteristics-construction year, materials, heating system, renovation history-all of which affect energy usage and emissions.

There are also numerous standards for estimating key performance indicators, making comparisons across portfolios or companies inconsistent. To build robust models, we must make informed assumptions-and critically, ensure those assumptions are transparent and clearly communicated.

The CO₂ Reduction Path is a fully integrated module within IAZI’s Real Estate Portfolio Management (REPM) software. It’s a smart planning tool designed to simulate decarbonisation trajectories-property by property, and across entire portfolios. It combines the monetary view of financial valuation of the building with the environmental impact of the investment planning. Here’s how it works:

• Baseline assessment: Calculates current energy efficiency and CO₂ intensity using either actual consumption data or model-based estimates.
  
• Pathway simulation: Forecasts how energy use and CO₂ emissions evolve based on past and planned renovations.
  
• Portfolio-level insights: Provides visual dashboards to help prioritise actions and ensure alignment with emissions targets.
  

This module enables clients to translate their investment plans into measurable sustainability outcomes. Key innovations embedded in the CO₂ Reduction Path include:

• Predictive modelling of energy usage and emissions based on capex planning and asset characteristics.
  
• No extra input required: Estimates are derived from data already in REPM.
  
• Interactive dashboards: Track changes in portfolio energy efficiency and CO₂ intensity over time.
  
• Scenario analysis: Identify gaps between current strategy and long-term targets-and adjust investment plans accordingly.
  

These sustainability modules are developed through close collaboration between product, UX, sustainability, data, and software engineering teams. This multidisciplinary approach ensures both usability and scientific rigour.

The technology stack includes:

• Frontend: Angular 19
  
• Backend: .NET 8
  
• Database: Microsoft SQL Server 2019
  
• Message & cache services: RabbitMQ and Redis
  

This architecture supports a high-performance, scalable and modular product ecosystem.

IAZI’s CO₂ Reduction Path tool is already in use across dozens of real estate portfolios, enabling institutional investors to plan emissions reductions in line with both regulatory and internal sustainability goals.

We have expanded this functionality beyond property owners to the financing side of the value chain. Specifically, we have developed a CO₂ reduction pathway tailored to mortgage portfolios. This allows banks and financial institutions to assess the decarbonisation potential of their financed real estate stock, identify transition risks, and align lending practices with climate targets.

This development marks a major step forward: it brings granular emissions modelling and scenario analysis into the world of sustainable finance, bridging the gap between credit risk, property condition, and environmental impact.

Our roadmap also includes:

• AI-powered data validation to ensure more accurate and credible energy consumption profiles
  
• Expanded modelling capabilities, including photovoltaic systems and other decarbonisation levers
  
• Automated renovation recommendations, optimising CO₂ reduction per CHF invested
  
• Seamless integration with financing tools and ESG reporting platforms, to create an end-to-end solution for sustainable real estate management

We  believe technology should not only serve the market-it should help shape a better one. By combining data science, engineering rigour and deep real estate expertise, IAZI is building solutions that support our clients in accelerating the decarbonisation of the Swiss building stock.

Sustainability is not a feature-it’s part of the foundation.