Between the two World Wars, all five ships underwent major upgrades. Warspite's revisions were most extensive, and her entire superstructure was remade.
During its lifetime the ship underwent a lot of changes in its arms configuration. Technological development made shooting beyond the horizon possible which resulted in an upgrade of the 15" main batteries so they could be elevated to 30 degrees instead of the original 20 and thereby increase its operational range. The rapid development of the aircraft and its role in modern naval warfare had a huge impact on the configuration. A large number of AA guns where placed and replaced during its later years. Especially during WWII the number was increased considerably. The number of the original secondary armament - the 6" gun batteries - was decreased again and again to be completely removed by the end of 1944.
Warspite was originally fitted with 8 40in searchlights. After the Battle of Jutland, the number of searchlights was nearly doubled due to the bad performance by the Royal Navy during the night action.