Castelnau produces Champagne from the region's classic grapes—Chardonnay and Pinot Noir—in expressions ranging from the elegant Blanc de Blancs Millesimé Brut, built entirely on Chardonnay's mineral precision, to the structured Millésime Brut and the Premier Cru bottling, both blending Chardonnay's finesse with Pinot Noir's depth. The house's wines have been assessed by Wine Spectator, Decanter, Wine Enthusiast, Wine Advocate, and Falstaff, reflecting engagement with the region's most exacting palates. Each release demonstrates the interplay of terroir and traditional method that defines Champagne's character.