The major reconstruction replaced machinery and removed two boiler rooms while retaining useful speed, freeing protected space for larger magazines. A new tower structure, fire-control arrangements, 4.5-inch dual-purpose battery, and aviation facilities made Renown far more suitable for a war shaped by aircraft. Her main turrets gained greater elevation, and the new secondary battery could engage both aircraft and small surface attackers. The cost comparison underlines how a comprehensive rebuild could rival a ship's original construction price.
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Renown's major 1936 reconstruction
New machinery, fire control, dual-purpose guns, armour, and aircraft facilities transformed Renown before the Second World War.