Casa Batlló: Barcelona’s Green Cultural Landmark and a Model of Sustainable Heritage

As a UNESCO World Heritage site and one of the masterpieces of Catalan Modernist architecture, Gaudí’s Casa Batlló is redefining what “sustainable heritage” means: advancing sustainability across environmental, social, and economic dimensions, transforming a century-old building from 1906 into a future-oriented green cultural landmark.

In recent years, under the framework of the UN 2030 Agenda for Sustainable Development, Casa Batlló has systematically promoted environmentally friendly operations, social inclusion, and local economic circularity, earning multiple international recognitions: joining the Biosphere sustainable tourism system in 2019 and officially obtaining Biosphere Sustainable Heritage certification in 2022; winning the Barcelona Sustainable Tourism Award in 2021 for its comprehensive practices across environmental, economic, and social dimensions; and receiving the Best Sustainable Project Award from Fondazione Santagata in 2024, becoming an international benchmark for sustainable management in the cultural heritage field.

I. “Naturally Sustainable Architecture” Rooted in Gaudí’s Philosophy

From an architectural perspective, Gaudí incorporated extensive natural lighting, cross-ventilation, recycled materials, and biomimetic structures in his renovation of Casa Batlló: the gradient tiles and window design of the central light well maximize natural light utilization; recycled glass and ceramic trencadís are widely used on the façade and interiors; curved and hollow structures facilitate airflow and heat regulation. These designs, predating contemporary sustainable architecture concepts, are now regarded as important precedents for biophilic architecture.

In today’s operations, Casa Batlló further respects and restores Gaudí’s original materials and colors through restoration projects: including the recent comprehensive restoration of the rear façade and the courtyard on the noble floor, using traditional techniques to restore glass and ceramic mosaics, wrought-iron balconies, wooden doors and windows, and the floor pavement composed of approximately 85,000 Nolla mosaic tiles. This project heavily relies on local craftsmanship, responding to a dual respect for traditional skills and low-carbon techniques while preserving the building’s original appearance.

II. Environmental Dimension: From Carbon Footprint to a “Zero-Carbon Heritage” Roadmap

In terms of environmental sustainability, Casa Batlló has recently developed a complete “from measurement to neutralization” action path:

• Biosphere Sustainable Tourism Commitment and Annual Sustainability Plan: Since joining the Biosphere project in 2019, it has used the UN Sustainable Development Goals (SDGs) as a management framework, formulating an Annual Sustainability Plan each year covering energy efficiency, waste management, water conservation, green procurement, and responsible tourism.

• Carbon Footprint Monitoring and Emission Reduction Measures: Since 2023, systematic measurement of CO₂ carbon footprint has been carried out, assessing the environmental impact of visitor reception, exhibition operations, energy consumption, and other aspects, providing a data foundation for subsequent emission reduction and compensation.

• Localized Carbon Compensation Plan Launch in 2025: According to the “2025 Sustainability Plan,” Casa Batlló will introduce local carbon sinks and ecological restoration projects through collaboration with Barcelona’s Municipal Parks and Gardens Department, achieving carbon emission compensation and advancing toward the goal of becoming a “carbon-neutral World Heritage site.”

• Environment-themed Content and Public Education: In the coming years, Casa Batlló will launch a “Sustainable Content Strategy” for visitors and local residents, including green guided tours, eco-themed exhibitions, immersive multimedia content, and online and offline educational projects to raise public awareness of climate change and sustainable tourism.

• Green Supply Chain and Local Collaboration: In catering, events, and daily operations, priority is given to local suppliers (including food, flowers, fruits, and event catering services), reducing logistics carbon emissions while promoting the local green economy.

III. Social Dimension: Inclusive Practices Centered on “Neurodiversity”

Unlike traditional environmental projects, Casa Batlló regards “social sustainability” and “environmental sustainability” as equally important pillars, with “neurodiversity” at its core, exploring new models of cultural heritage management.

• Long-term Collaboration with Specialisterne and Job Innovation: Since 2021, Casa Batlló has established a long-term partnership with Specialisterne, an organization dedicated to the employment of autistic and neurodivergent individuals, implementing a pioneering “Neurodiversity Employment Program”:

○ In frontline visitor reception roles, approximately 85% of the staff are neurodivergent individuals (including those with autism, dyslexia, ADHD, etc.), responsible for tour services, audience reception, and on-site experience management;

○ Casa Batlló became the first World Heritage site to extensively introduce neurodivergent employees in its frontline service team, setting a new paradigm of social inclusion for cultural institutions worldwide.

• European Honors and Voices on International Platforms: In 2025, Casa Batlló won the European Heritage Award / Europa Nostra Award for this model, in the category “Citizen Participation and Public Awareness,” highlighting its contribution to promoting social inclusion and equal participation through cultural heritage management. Casa Batlló has also shared its experience of “sustainable heritage and neurodiversity management” at UNESCO-related conferences and the Mondiacult World Culture Forum, demonstrating how cultural institutions can foster social sustainability through inclusive employment and diverse team building.

• UNESCO World Heritage Volunteers and Educational Projects: Through programs such as the UNESCO World Heritage Volunteers Initiative, Casa Batlló offers participation opportunities to young people worldwide, encouraging the younger generation to understand the connections between cultural heritage conservation and social and environmental sustainability.

• Internal Organizational Culture: From TEAL Organization to Nonviolent Communication: As early as 2018, Casa Batlló began its internal transformation toward a “TEAL self-managing organization” and continuously introduced content such as “nonviolent communication” in employee training, managing the team in a flatter, trust-based, and co-creative manner. This organizational culture is highly consistent with its acceptance and support of neurodivergent employees, serving as the “internal infrastructure” for its social sustainability.

IV. Economic Dimension: A Cultural Economy Model of Local Collaboration and Circular Design

On the economic front, Casa Batlló has explored a path combining cultural heritage, creative design, and circular economy:

• Collaboration with Local Artists and Sustainable Cultural Products: Through the Simbolic Store project, Casa Batlló collaborates with local artists to develop cultural products inspired by Gaudí and architectural details, emphasizing sustainable materials and local production in the design; some products are directly derived from restoration materials or recyclable resources, turning “restoration fragments” into souvenirs of “urban memory.”

• Waste Regeneration and Zero-Waste Concept: Fabrics, paper, or packaging offcuts generated during store operations are collected and redesigned into new secondary products, transforming “waste” into story-bearing souvenirs, practicing the circular economy.

• Social Equity and Accessibility in Pricing Strategy: While maintaining its status as a world-class cultural landmark, Casa Batlló offers discounted prices for local residents, students, people with disabilities, and other specific groups, ensuring the “accessibility” and “inclusivity” of cultural heritage, making sustainability not just an environmental issue but also a cultural and social equity issue.

• Local Supply Chain Priority Policy: Priority is given to local suppliers in catering, events, and daily operations, helping reduce transportation-related carbon emissions while channeling part of the ticket and commercial revenue directly into supporting the local economy and employment, forming a closed loop of “cultural economy × local green development.”

V. Immersive Experiences and Green Narratives: Technology-Enabled Sustainable Communication

Leveraging digital technology and immersive experiences, Casa Batlló transforms “sustainability” from a management concept into content perceptible and experiencable by the public:

• Through annual video mapping projections on the façade and themed light events such as “Saint George’s Day Rose,” Casa Batlló turns nature, seasons, ecology, and Gaudí’s inspiration into large-scale urban public art, attracting tens of thousands of participants. These events often revolve around nature, climate, and urban symbiosis, bringing sustainability themes into the public eye through art.

• Projects like the “10D Immersive Experience” use multi-sensory technology to help audiences intuitively understand the relationship between architecture, nature, light, and air, reinforcing the idea that “Gaudí’s architecture itself is a sustainable laboratory.”

VI. International Recognition: From World’s Best Landmark to Sustainable Heritage Benchmark

Thanks to its overall performance in sustainable development and innovative experiences, Casa Batlló has received numerous international awards and honors in recent years:

• In 2021, it was named “World’s Best Landmark” at the Remarkable Venue Awards organized by Tiqets;

• In 2021, it won the Barcelona Sustainable Tourism Award, recognizing its comprehensive practices across environmental, social, and economic dimensions;

• In 2024, it received the Best Sustainable Project Award from Fondazione Santagata;

• In 2025, it won the European Heritage Award / Europa Nostra Award in the “Citizen Participation and Public Awareness” category, establishing an inclusive management model centered on neurodiversity.

These honors not only prove the vitality of a century-old building in the 21st century but also strengthen Casa Batlló’s “supercredibility” in the field of global sustainable cultural tourism and innovative heritage management.

Today, Casa Batlló is no longer just an “Instagram-worthy building” for global tourists; it is a complete sample of sustainable cultural heritage practice:

• At the environmental level, starting from Gaudí’s architectural wisdom, it explores the responsibility of World Heritage in the era of climate crisis through carbon footprint monitoring, carbon neutrality pathways, and green operational strategies;

• At the social level, with the neurodiversity employment program at its core, it reshapes the relationship between cultural institutions and employees, communities, and disadvantaged groups, making “inclusion” a new industry standard;

• At the economic level, through local collaboration, creative cultural products, and circular design, it builds a sustainable business model that balances cultural value and green growth.

As the “2025 Sustainability Plan” and “2025–2030 Heritage Management Strategy” are gradually implemented, Casa Batlló will continue to seek balance among environmental protection, social inclusion, and cultural innovation, providing a replicable “Barcelona model” for more historic buildings and tourist destinations worldwide, and offering new inspiration and possibilities for collaboration between China and the West in cultural heritage protection, green innovation, and social inclusion.