The senior partner was his half-brother Edward Welby Pugin.
[1] When Edward Welby Pugin died suddenly on 5 June 1875 as a result of overwork and 'injudicious use of chloral hydrate', the main responsibility for the practice passed to Peter Paul Pugin.
Although Peter Paul's offices remained in London, England and Liverpool, England, his practice was largely Scottish, and he also maintained an office in Glasgow, Scotland.
Whereas Peter Paul's earlier churches were strongly influenced by his father and brother, by the 1880s, he had developed a recognisable curvilinear Gothic style, usually in red sandstone with elaborate altarpieces in coloured marbles.
[2] Peter Paul died in Bournemouth in March 1904, the firm being continued by his nephew Sebastian Pugin Powell, born in 1886, the son of John Hardman Powell.