Anne Carrier Architectes, in consortium with Labonté Marcil architectes, has realized the expansion of Bibliothèque L'Octogone in Montreal's LaSalle borough. This project successfully transformed a beloved but spatially constrained community institution into a vibrant, light-filled civic hub while preserving its iconic octagonal identity.
Anne Carrier Architectes' proposal for this project reimagines the library as a comprehensive 21st-century cultural destination. The designers nearly doubled the area from 2,645 to 4,500 square meters through the strategic addition of a new floor and three distinct architectural lanterns. Anne Carrier Architectes' approach to the Bibliothèque L'Octogone expansion demonstrates a profound respect for the existing structure, as the original octagonal volume is preserved and extended. This decision also maximized the reuse of the concrete slab and structural framework to avoid up to 261,000 kilograms of carbon emissions and divert 870 cubic meters of construction waste from landfills.
Light-Filled Civic Hubs
Anne Carrier Architectes Completed Bibliothèque L'octogone's Expansion
Trend Themes
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Adaptive Civic Reuse — Preserving landmark structures while expanding public functionality creates room for low-carbon renovations that modernize community assets without erasing local identity.
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Architectural Daylight Hubs — Light-centered design elements such as lanterns and atriums are reshaping libraries into welcoming cultural destinations with stronger social and experiential value.
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Carbon-conscious Expansion — Reusing slabs, frames, and existing building volumes signals a shift toward construction models that reduce emissions while extending the life of civic infrastructure.
Industry Implications
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Architecture — Design firms are finding new value in hybrid preservation-and-expansion projects that combine heritage continuity with contemporary public programming.
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Construction — Material reuse and structural retention are opening pathways for lower-waste building practices across institutional renovation projects.
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Public Libraries — Libraries are evolving beyond book-focused facilities into multifunctional civic spaces that support culture, learning, gathering, and neighborhood identity.