Her family's home at 19 Princelet Street, a 'brick messuage' built in 1719, has been conserved as a museum of immigration and diversity.

[7] With him she had eight children, although only four survived,[8] and their son George, apprenticed in 1761 to a silk throwster, began the link to the textile company Courtaulds.

In 1777 her son, Samuel Courtauld II, replaced Cowles in that capacity and they registered a new joint hallmark.

[11] Louisa Courtauld's portrait was painted, possibly by Johann Zoffany, whose commissions included members of the British royal family.

[3] Her last will and testament, probated 27 January 1807, identifies her as "Louisa Perina Courtauld, Widow of Saint John Hackney, Middlesex.