Heuster’s recorded connexion with Chichester dates from the late 1430s. In the course of his career, and probably by purchase, he acquired property outside the west gate of the city, a small estate a few miles to the east at Yapton, Barnham and Walberton (in 1456) and land to the south at West Itchenor and Birdham (in 1461).
By the time Heuster first settled in Chichester he had completed his legal training, as is clear from his increasing employment in the central courts at Westminster as an attorney for litigants from Sussex.
Besides his employment in the central courts on behalf of inhabitants of Chichester, Heuster served the civic community in other ways. In May 1446 he joined the mayor, William Hore I*, and five others in obtaining a royal licence for the foundation of the guild of St. George on a more permanent basis than hitherto, and the endowment of a chantry in the cathedral where prayers might be said for the members of the guild and their families.
Having been asked to be an executor of the will of William Hore, the former mayor of Chichester, Heuster was kept busy administering Hore’s estate for several years.
It is perhaps surprising, given his experience as a lawyer and civic official that before Edward IV came to the throne Heuster was never appointed to any ad hoc royal commissions. In the 1460s, however, he was named on two such bodies, required to examine water-courses in his home county. He continued to assist the gentry of the locality in their legal transactions, for instance by acting as a feoffee of the manor of Earnley on behalf of John Erneley*’s son John, and as supervisor of the will the latter made in 1465.
At an unknown date Heuster had enfeoffed Sir Roger Lewknor and others including John Wood and John Goring of a house on the west side of South Street, Chichester, which was conveyed by the surviving feoffees to William Galon on 1 Feb. 1479.
