Since 2002 substantial restoration has occurred on more than half the core maintenance shop complex.
There was a major addition around 1700, and a substantial restoration in 1886 - 1887.
In 1961 substantial restorations took place, which have had the effect of emphasizing the Romanesque character of the structure.
A significant amount of the original Worth Park garden still exists from the early 1900s but is now in need of substantial restoration.
Some of the vehicles still require substantial restoration before moving from storage to exposition.
However, the construction was of poor quality and the church needed substantial restoration.
The north wall underwent a substantial restoration in 2006, which included the installation of reproduction Dutch-style casement windows.
Current therapies for osteoporosis, for instance, slow bone loss but rarely bring substantial restoration.
A substantial restoration was done by John Oldrid Scott in 1874 to 1875.
The house has recently undergone substantial restoration to its exterior.