Refurbish
Several refurbishments were carried throughout the reign of Sultan Sulaiman Badrul Alam Shah (1920 -1942) and Sultan Ismail Nasiruddin Shah (1945- 1979). Further additions were carried out to the Istana buildings in 1972 and 1998.
Palace
Wood supply to build the Istana from Dungun came under the responsibility of Tengku Panglima Besar Tengku Muda Kechik. While bricks and chalk were handled by Tengku Besar Paduka Indera. The Istana Maziah had its early foundations built from a mixture of chalk, clay, sand salts, egg white and sugars. Almost 20 carpenters of Malay and Chinese descent were involved in the building of Istana Maziah.