PROJECT HISTORY
The challenge
How can a decades-old building be renovated into an energy-efficient space to breathe new life into it?
Castellana 66
Transforming a classic office building into a sustainable space
The solution
We proposed a sustainable renovation plan, emphasizing energy efficiency, noise protection and user wellness through advanced facade design.
The impact
This project aims to reduce annual energy consumption by 55%, saving an estimated 10,800t CO2e by retrofitting the concrete structure.
55%
Reduction in annual energy use
177 MWh/yr
Electricity generated from solar PV
10,800t
Projected CO2e avoided
The challenge
The need to revitalize Madrid's Castellana 66, a historic mixed-use office building constructed in 1990, represented a strategic blend of heritage preservation and forward-looking ambition. This seven-story structure, while iconic, faced challenges including energy inefficiencies and a significant carbon footprint. Outdated features such as inefficient windows and inadequate thermal insulation contributed to high energy costs, underscoring the urgent need for a sustainable upgrade. The transformation aims to honor the building’s legacy while aligning it with modern standards of efficiency and environmental responsibility.
The solution
Arcadis, renowned for its architectural expertise and commitment to sustainable transformation, proposed a holistic renovation approach for the building envelope. Using bioclimatic principles—specifically photovoltaics (PVs) and high-performance materials—would enhance noise protection, energy efficiency and thermal insulation. The plan included harmonizing the structure with its surroundings by selecting construction materials that aligned with and complemented the physical environment.
Instead of opting for demolition and rebuilding, the focus was on a meticulous facelift to create an updated and optimized external structure. This would prevent the release of approximately 10,800 metric tons of CO2e otherwise stored in the concrete - akin to planting 250,000 trees yearly. Additional onsite energy production will surpass consumption and set the stage for eventual carbon neutrality.
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Overall, the innovative facade design not only integrates energy-efficient PVs with minimal carbon impact, but also reduces operational energy consumption, enhances natural light and improves well-being for occupants.
Castellana 66 is now one of the most energy-efficient buildings in Europe. This project showcases our commitment to innovative solutions that reimagine existing buildings in inventive and sustainable ways.
The impact
Enhancing the building's envelope and mechanical systems and incorporating renewable energy generation onsite led to a 55% reduction in annual energy usage compared to 2003 levels.
As a result of these efforts, Castellana 66 is set to become one of Europe's most energy-efficient buildings, setting a high standard for sustainability while offering an exceptional blend of visual appeal, flexibility and environmentally sound design.
