Bonnin has been described as "the builder who more effectively than any other left his stamp on present-day Brompton." Around 1806, he was involved in a number of developments in the Hans Town area. Bonnin was then describing himself as a
carpenter and
undertaker. In 1815, the
London Gazette reports a James Bonnin - builder, carpenter, dealer and chapman - of North Street, Kensington being declared bankrupt. However he seems to have recovered rapidly from this setback: in a trade directory for 1816-17 he is listed as a timber merchant with an address in Sloane Place. About 1819-20 Bonnin was involved in building in Knightsbridge (including Trevor Square), and in 1821 he undertook the initial development of
Brompton Square. His subsequent work was divided between for the Alexander Estate (starting in 1826) and Smith's Charity, which owned substantial areas of land in the Brompton area. His first contract for the charity started in 1822. He built a terrace of eight houses for the charity, (Onslow Terrace: later demolished to make way for the underground railway), on what is now the western end of
Brompton Road. Bonnin worked with a surveyor appointed by the charity, whose job was to handle the details of contracts and approve designs for the buildings. In 1828
George Basevi, an architect who was a cousin of
Benjamin Disraeli, was appointed surveyor. Bonnin was a meticulous builder who produced high quality buildings and from then on, Basevi designed the houses and Bonnin built them. Between 1833 and 1844 they built Pelham Crescent, Pelham Place, part of Pelham Street and a small area of Fulham Road on either side of the Pelham Street junction. Alongside the building, Bonnin had another venture. In 1802, his sister Susanna had married Samuel Cocks, a master pewterer in the City of London. At some point - probably after Samuel's death in 1820, Bonnin went into partnership with Susanna, who kept the Cocks pewter touch mark producing until 1844. Bonnin was admitted to the
Freedom of the City of London as a Master Pewterer in 1836. His partnership with his sister was dissolved in 1838. By 1843, Bonnin and his second son, also James Bonnin, were splitting further work on the estate between them. James junior was appointed to construct 6-10 (even) Pelham Street and some houses on the north side of Pelham Street which were eventually demolished to make way for the South Kensington station. Bonnin secured a much bigger project on the site of Brompton Grange, which was to result in the construction of
Egerton Crescent, Egerton Terrace, Yeoman's Row and Crescent Place by 1849. Bonnin may only have been directly involved in the construction of Egerton Crescent and probably sub-contracted the rest of the work. To finance these various developments, the Bonnins entered into arrangements with lenders and with other speculators. It is known, for example, that Bonnin borrowed £2,000 from a wine merchant in Pelham Crescent, on the security of his underlease of Nos. 50-53 Egerton Crescent. Bonnin's partnership with architect George Basevi ended in 1845 when Basevi fell from one of the towers of
Ely Cathedral and was killed. == Personal life ==