The house has small vineyards in several renowned Côte des Blancs villages – Le Mesnil-sur-Oger, Oger and Avize (Grand Cru) and Vertus (Premier Cru). These villages sit on chalky slopes where thin limestone soil gives Chardonnay the region's typical precise acidity, chalky minerality and straight structure.

Girard-Bonnet's Champagnes are based mainly on Chardonnay. In the vineyards the focus is on small parcels, low yields and the balance between ripeness and acidity. Several plots have been in the family for decades and give small but concentrated crops.

In the cellar the approach is technically precise and rather restrained. Fermentation uses natural yeasts, in stainless steel or neutral oak depending on the cuvée. Whether malolactic fermentation is used depends on the vintage and the wine – the aim is to keep the tense acidity and clarity of Côte des Blancs Chardonnay. The wines age for a long time on the lees, adding texture and depth.

The range is built on the expressions of villages and single vineyards – from the fresher, more approachable style of Vertus Premier Cru to the chalky precision of Le Mesnil-sur-Oger, the elegance of Avize and the slightly broader, riper tones of Oger. The result is Champagnes that emphasise origin, structure and minerality – a clear and detailed expression of Côte des Blancs Chardonnay.