Born at Withiel in Torpoint, Cornwall, Condy was the son of Nicholas Condy of Mevagissey and his wife, Elizabeth Thomas. He became a professional painter after serving in the Peninsular War (1811-1818). In 1814 he married Ann Trevanion Pyle in Stoke Damerel, Devon, where they made their home (Plymouth).
He specialised in landscape painting and coastal scenes in watercolours, which he produced on tinted paper to a standard size. His best known painting is at Mount Edgcumbe in Cornwall (The Court Dinner at Cotehele), and he published a book of his watercolours about Cotehele (now a National Trust property).
His son was Nicholas Matthew CONDY, also a landscape painter and teacher, who pre-deceased his father.