The Mattancherry palace is a two-storeyed edifice built in traditional Kerala naalukettu (quadrangular) model. The four separate wings open into a central courtyard. The courtyard houses a temple of the royal deity Pazhayannur Bhagavathi. There are also Temples dedicated to Lord Krishna and Lord Shiva.
The elegant palace has a simple style. The palace has Coronation hall, royal bed chamber, dining hall, assembly hall, ladies quarters and the staircase room. The ceilings are decorated with wood carved floral designs including the design of an inverted lotus. The unique flooring imitates black marble. A mixture of burnt coconut shells, lime, plant juices and egg-whites was used.