In 1851 he surveyed the Beauchamp Tower of the Tower of London and subsequently restored the Salt, Wakefield and White Towers and the Chapel of St Peter ad Vincula. Following this he was instructed by Prince Albert to carry out work on Windsor Castle. This included replacing sash windows with lancets and mullioned windows and rebuilding the Clewer Tower. Salvin designed Peckforton Castle in Cheshire for John Tollemache, 1st Baron Tollemache as a recreation of a castle of the time of Edward I. In 1852 he started work on the restoration of Alnwick Castle in Northumberland. This included replacing one of the towers with a larger tower, the Prudhoe Tower, creating a porte-cochère, replacing windows and replanning the interior.