Kota Lama Duyong, built in 1919 -1920, suffered significant damage over time, particularly from floods in 1986, which affected its wooden structures and walls. To preserve its historical and cultural value, the Malaysian Ministry of Culture and Arts carried out a rehabilitation and restoration project. This included repairing and replacing damaged wooden structures using traditional joinery methods, restoring the high protective brick walls, and preserving the intricate wooden carvings (sobek) on doors and verandas. Care was taken to maintain the fort’s nine connected roofs and traditional Malay house forms, using traditional materials such as wood, bricks, lime, and stone to reflect the original craftsmanship. After restoration, Kota Lama Duyong was reopened as a heritage site and museum, allowing visitors to appreciate Terengganu’s architecture, culture, and history while ensuring the site is protected for future generations. 

The conservation of Pulau Duyong and Kota Lama Duyong focuses on preserving the original materials and features of the buildings. Traditional Malay architecture and carvings are kept authentic, and repairs are done only when necessary using traditional methods. Work is done so it can be reversed if needed, and preventive measures protect the buildings from floods, humidity, and pests. All work is documented, and the community is involved to maintain heritage awareness. The buildings can also be used as museums or cultural centers without harming their historical value.