Municipal and Regional Governments support a comprehensive review of the city’s heritage protection regulations, including restrictions on window and door materials. The proposed changes seek to reconcile architectural preservation with energy efficiency, sustainability, and the practical needs of residents in one of the Atlantic’s most distinguished UNESCO World Heritage cities.

The preservation of a historic city is never simply a matter of protecting its buildings. It is also a question of safeguarding the relationship between architecture and everyday life, between the inheritance of centuries and the changing needs of those who continue to inhabit its streets. In Angra do Heroísmo, on the Azorean island of Terceira, that delicate balance has returned to the center of public discussion as municipal and regional authorities express support for a comprehensive revision of the regulations governing the city’s protected historic center.

The proposed changes to the Detailed Preservation and Safeguarding Plan of Angra do Heroísmo (PPSAH) were examined by the Azorean Legislative Assembly following a citizens’ petition calling for the modernization of existing restrictions, particularly those concerning the materials permitted for exterior window and door frames. At the heart of the debate is the possibility of allowing modern PVC frames to replace traditional wooden installations, provided that the architectural and cultural integrity of the UNESCO-listed city is preserved.

The Mayor of Angra do Heroísmo, Fátima Amorim, appearing before a parliamentary committee, expressed agreement with the concerns raised by the petitioners and emphasized that the issue should form part of a much broader reassessment of the city’s heritage regulations.

According to the mayor, the municipality is already working toward a comprehensive revision of the preservation plan, a process that must begin at the municipal level and involve changes to several territorial planning instruments.

“The Detailed Preservation and Safeguarding Plan dates from 2015 and genuinely requires a revision, and a profound one, not merely concerning window frames,” Amorim stated, recalling that similar regulatory difficulties had recently emerged over the installation of photovoltaic panels within the protected historic area.

The mayor’s remarks underscore a growing recognition that heritage protection policies, however essential to preserving the character of historic urban environments, must also respond to technological developments and contemporary expectations regarding housing, environmental sustainability, and energy conservation.

Any eventual changes will, however, require final validation by the Regional Government and UNESCO.

A Historic City Confronts Contemporary Realities

The petition, whose principal signatory is Ana Rita Couto, argues that the existing regulations no longer adequately reflect the technical and economic realities of contemporary construction and building rehabilitation.

According to Couto, the rules governing exterior frames have not kept pace with advances in materials and construction methods, particularly regarding thermal insulation, energy efficiency, durability, and residential comfort.

The petitioners also identify a discrepancy between the formal requirements of the preservation plan and the conditions observable throughout the historic city. Numerous existing window and door installations, they argue, appear not to comply with the regulations currently in force.

The petition therefore calls for an urgent revision of Article 74 of the PPSAH, approved under Regional Regulatory Decree No. 7/2015/A, to establish criteria more consistent with contemporary technical, construction, and economic conditions while maintaining the fundamental principles of architectural preservation.

Beyond the question of window frames, the petition advocates a comprehensive reassessment of the preservation plan, incorporating advances in construction technology, sustainability requirements, and the practical realities of urban rehabilitation. It also calls for public consultation and proposes establishing a mandatory schedule for future reviews.

The Regional Secretary for Education, Culture and Sports, Sofia Ribeiro, has likewise expressed support for revisiting the existing regulations and confirmed the Regional Government’s willingness to cooperate with the municipality.

Architects Call for a Comprehensive and Carefully Considered Approach

The Azores Regional Section of the Portuguese Architects’ Association has also acknowledged the need to modernize the preservation plan, although it cautions against making isolated changes that focus exclusively on permitting PVC or other alternative materials.

In an opinion submitted to the Regional Legislative Assembly, the association argues that any revision should emerge from a comprehensive evaluation of the plan’s implementation and a clearly articulated strategy for the city’s architectural future.

The architects emphasize that the preservation of historic buildings depends on far more than the materials used in their windows and doors. The proportions of frames, their depth and positioning within openings, the configuration of movable sections, surface textures, reflective qualities, hardware, and even the shadows created by architectural elements all contribute to the visual identity of a historic urban landscape.

For this reason, the association recommends developing detailed standards that recognize the characteristics of different materials without relying on superficial imitation of traditional construction.

Such an approach, the architects suggest, would allow contemporary building technologies to be evaluated in relation to the city’s historic character, while also taking into account energy efficiency, indoor air quality, and modern standards of habitability.

The association further recommends identifying buildings whose particular architectural or historical significance may justify stricter restrictions on alterations.

Regarding the petition’s proposal for mandatory periodic revisions, the architects consider that a fixed timetable would not be appropriate unless explicitly required by law. They nevertheless emphasize the importance of respecting the plan’s established implementation period and conducting evaluations every three years to determine whether amendments or a more substantial revision are necessary.

Their conclusion supports a comprehensive update of the PPSAH, provided that the process respects the historical, architectural, and cultural values that distinguish Angra do Heroísmo as a UNESCO World Heritage city.

Preserving the Past Without Compromising the Future

The debate carries particular significance in Angra do Heroísmo, whose historic center was inscribed on the UNESCO World Heritage List in 1983. Its urban landscape reflects centuries of Atlantic navigation, maritime commerce, architectural adaptation, and cultural encounters that shaped the city into one of the most historically significant urban centers in the Portuguese-speaking Atlantic world.

Its streets, squares, churches, façades, and traditional buildings are not merely architectural artifacts. They form a living expression of the Azores’ historical relationship with Europe, the Americas, and the wider Atlantic.

Yet the continued vitality of such a city depends upon its capacity to remain inhabited, functional, and responsive to contemporary life.

The challenge confronting Angra is therefore not whether its architectural heritage should be preserved, but how preservation can coexist with the legitimate expectations of those who live and work within its historic boundaries.

Energy efficiency, environmental responsibility, housing affordability, and the maintenance of older buildings are increasingly important considerations for historic cities throughout Europe. Angra’s discussion reflects this wider challenge of ensuring that heritage protection remains compatible with the social and economic realities of the present.

Ultimately, the proposed revision offers an opportunity to reconsider the meaning of preservation itself. A historic city cannot be treated as a museum whose inhabitants are expected to live indefinitely according to the technological limitations of another century. Nor can modernization be permitted to erase the architectural character that gives such places their cultural significance.

The enduring beauty of Angra do Heroísmo resides not only in the stones that have survived the centuries, but also in the lives that continue to unfold behind its windows and doors. To preserve that beauty is to protect both its visible inheritance and its human continuity.

For a city whose history was written through encounters between oceans, peoples, and civilizations, the task ahead is to discover once again the wisdom of balance: allowing the past to retain its dignity while ensuring that the present has room to breathe.

The most meaningful preservation, after all, does not imprison history. It allows history to remain alive