snøhetta completes arched addition to 100 year-old st. louis symphony hall

snøhetta’s renovation of the st. louis symphony orchestra expands the historic venue with a 64,000 square foot addition.

kat barandy September 20, 2025 3 min

a 1925-built theater in st. louis sees modern expansion

The renovation of the St. Louis Symphony Orchestra’s Powell Hall by Snøhetta brings a balance of heritage and contemporary design to one of the American city’s most cherished landmarks. Located on St. Louis’ Grand Boulevard, the project expands and reimagines the 1925-built theater building while preserving its architectural character and acoustic qualites.

The global architecture firm worked alongside Christner Architects, Schuler Shook, BSI Constructors, and Kirkegaard to create a 64,000-square-foot addition in time to celebrate the hall’s centennial in 2025. The expansion improves accessibility and introduces new public spaces, educational spaces, and backstage areas to support the full scope of the Symphony’s programs and community events.

snøhetta st. louis symphony — images © Sam Fentress

snøhetta’s arching addition

Visitors to the St. Louis Symphony Orchestra now approach a series of canted masonry shells and arched openings, which the team at Snøhetta designs as the new front-of-house addition. These inclined surfaces and generous windows create a sense of openness, inviting passersby to glimpse the activity within. Inside, a triple-height lobby holds terraces and gathering areas that visually connect different levels, encouraging interaction before and after performances.

Outside, Snøhetta has shaped a public plaza at Grand Boulevard and Samuel Shepard Drive to extend the vitality of the Symphony into the city. The sunlit square offers flexible space for gathering, integrates vehicle drop-off zones, and introduces lush planting beds that soften the urban setting while providing accessible routes from multiple directions.

a fluid connection between old and new

Snøhetta plans circulation paths to flow easily through the site, allowing visitors to the St. Louis Symphony Hall to move easily between indoor and outdoor spaces. Towering groves frame the entryways, and a network of pathways ensures that the plaza is welcoming and functional, whether for pre-concert mingling or quiet daytime use.

Behind the scenes, the eastern expansion delivers state-of-the-art rehearsal rooms, recording suites, and storage areas. These upgrades provide musicians and staff with modern facilities for practice and collaboration, while community programming strengthens the project’s role as a creative hub.