A new restoration phase launched in late 2025 focuses on the choir gallery-stained glass, unrestored since its 19th-century installation.
Interior scaffolding has been installed within the choir galleries, positioned to allow worship services and public visitation to continue uninterrupted. Each panel is being progressively removed following detailed documentation—photographed, measured, and assessed before removal to ensure precise reinstallation.
A technical challenge has emerged: some panels contain asbestos materials in their framing. Remediation is being performed on-site in specially constructed confined spaces at the rear of the chevet, equipped with negative air pressure systems and filtration to ensure worker safety and prevent interior contamination.
Once removed and cleared, the stained glass is sent to master glaziers’ workshops for comprehensive restoration: disassembly of panels, cleaning and repair of individual glass pieces, restoration of painted details, rebuilding of the lead came, and structural reinforcement for long-term stability.
This work is strategically coordinated with exterior masonry restoration at the tribune level. While glass is in workshops, masons have unobstructed access to restore stone tracery, mullions, and surrounding masonry. This sequencing eliminates redundant scaffolding and reduces overall timeline. The restored panels will return in approximately two years, after completion of all chevet-related masonry and structural work.