At around this time he was employed by Beckford's son-in-law the Duke of Hamilton at Hamilton Palace, in the finishing of the grand staircase and hall, and in building the Beckford library there. He also made a design for a mausoleum, which was originally intended to be built adjoining the palace. The Duke, however, changed his mind, and decided to build it some distance away in the park. Goodridge made several designs for the new situation, but his client thought them too extravagant, and Goodridge only built the burial vaults of the new structure, the chapel above being entrusted to another architect.