Taking over a local building business in which he was a clerk, Thomas Baldwin ensured his name was linked with most of the prestigious building projects of Georgian Bath, including:
The Guildhall, said to have one of the finest Adam-style interiors in the country, is a grandiose civic building designed in 1776, and features a set of giant chandeliers made two years later by William Parkeer. The impressive portraits of notables, including royals, tell the story of Bath.
In 1776 Baldwin was made the City Surveyor and in 1780 promoted to City Architect. In 1793 he appears to have retired from business life to live in his own house in Great Pulteney Street where he died in 1820.