The temple architecture is Dravidian style architecture with wooden pillars, doors and roofs. The Temple is surrounded by a thirty-feet-high fort wall. The outer corridor stand on 224 stone pillars. The adjacent forward facing mandapams includes sculptures and art works which depicts events from Ramayana. It also portrays Gods and goddesses from Hindu mythology including Shiva, Parvati and Sri Krishna etc.
The lord is lying on his snake couch and has to be viewed through three doors. We could see Lord Shiva near Lord Adikesava Perumal inside the sannidhi. Deepalakshmis are many but none resembles the other. The Otraikkal Mandapam (single stone hall) made of a single stone 3 feet thick, is a marvel. Oorthuva Thandavam, Venugopala, Rathi, Manmatha, Lakshmana and Indrajit are excellently carved. The temple is also renowned for its murals.
The composite columns of Virabhadra holding sword and horn are found be additions of the Vijayanagara kings during the early 1500s. Similar columns of Virabhadra are found in Meenakshi Temple at Madurai, Nellaiappar Temple at Tirunelveli, Kasi Viswanathar temple at Tenkasi, Krishnapuram Venkatachalapathy temple, Ramanathaswamy Temple at Rameswaram, Soundararajaperumal temple at Thadikombu, Srivilliputhur Andal temple, Srivaikuntanathan Perumal temple at Srivaikuntam, Avudayarkovil, Vaishnava Nambi and Thirukurungudivalli Nachiar temple at Thirukkurungudi.
An old view of the temple
The temple complex includes a Ayyappan temple behind which stands the Ksetra bala Balikkal. It also includes Sree Bali Prakaram and the Yanaikottil. Other deities being located in the south-western corner, the flagmast is located at the west at the Sree Balippura. As per the stone inscriptions in the pedestal of the flag mast it was renovated by Sree Moolam Thirunal Rama Varma VI in 1071 KE.
The granite entrance of the Chitra Sabha includes sculptures of the Dwara Palakas, Jaya and Vijaya. Sculptures of Lakshmana and Pathanjali Tandava carved to the left of Sabha Mandapam while that of Indrajith, Muralidhara and Kalabairava are carved to the right. The image of the chief deity in his sayana posture, is sculpted on the wooden entrance door. Vatteluttu incriptions of Shilpa Shastra are found in adjacent walls. It also includes details about the 11th century Chola King Rajendra Chola.
Sculptures of Rati and Manmadan is found opposite Udaya Marthanda Mandapam. The epic scenes Vinayaka Kalyanam, Bharata War and deities Varuna, Niriyati, Yama, Kubera, Indra, Agni, Brahma and Monks in penance are sculpted in a row above the Mandapam. A variety of mural painting are found along the walls of the inner prakarams. A secret passage leading to the Palace is found beneath the west of the inner prakarams which is covered with a large stone slab.
Going by extant legends, the temple is closely associated with the famous Sree Anantha Padmanabhaswamy Temple, Thiruvananthapuram. Thiruvananthapuram Sri Anantha Padmanabhaswamy temple deity lies in the direction as to see the Thiruvattar Adi kesava deity. The main deity was originally covered with gold kavachams in which diamonds and other precious stones were embedded which the Kerala kings had presented to the temple.
There is also a small shrine for Lord Lakshmi Narasimhaswamy near the river and opposite to the Adikesava Perumal Temple. Alvar saint Nammalvar had sung 11 pasurams in praise of Adi Kesava Swamy in the 6th Thiruvai mozhi. There are Three temples related to Adikesava Perumal Temple.
It is believed that, the Moolasthanam of all three temples such as Padmanabhaswamy temple, Thiruvananthapuram; Adikesava Perumal Temple, Thiruvattar and Sri Ranganathaswamy Temple, Srirangam is Ananthapadmanabhaswamy Temple or Anantha Lake Temple near Kumbla in Manjeshwaram Taluk of Kasaragod District of Kerala, South India.