Sri  la  Sri  Veerasekara  Gnanadesikar  called  Thirukkalar Andavar  who became the fifth head of the mutt did renovation  in the temple of Parijathavaneswarar and Amirthavalli at Thirukkalar near Mannargudi in Thanjavur district. He also established Vedanta  mutt,  constructed a granary, a Pasumadam  and created  a Nandavanam (flower garden). 

 In 1908 he celebrated the consecration of Kotravaleeswarar and Thirunellai Amman temple in the presence of his holiness Sri Satchidananda Siva Abinaya Narasimma Bharathi of Sringeri mutt.

He  had  the Saradhambal temple constructed  at  Sringeri,  using granite and Koviloor mutt met the entire expenditure. We can find similarity in the appearance and structure of the temple  of Saradhambal  and that of Thirunellaiyamman. He made five temple cars for the Panchamoorthis at Thirukkalar.  He  had  a  title called  Rajarishi. There was a close  connection  between the Sringeri Peedam and the Koviloor mutt, in his regime. 

 The  Mahamandapam in front of Thirunellaiyamman Sannadhi  is known for its exqusite and  wondrous sculpture and craftsmanship. We can find beautiful sculpture carved out of a single  piece  of stone. On one pillar Sri Saradha Devi appears as  a  decorated angel;  on  the other Karaikkal Ammayar stands near the  feet  of Urthavathandavaraja;  yet on the other we find the  sculpture of Goddess  Meenakshi's wedding, depicting Brahmma with  his  folded hands  and beating  the drum. We also find a sculpture of Srimath Andavar  prostrating  before Ambal signifying the  importance of complete  surrender  to God.  We infer from this  sculpture  that devotion  is more important than salvation and  through  sincere devotion one can attain salvation. 

Till the fourth descendant there was a habit among the heads of the mutt, to wear a piece of white cloth from hip to knee and a single  bead (Rutraksha) tied in a white ribbon around the  neck. Sri Thirukkalar Andavar, the fifth head of the mutt wore  saffron following  the custom of Sringeri Guru Peedam. Till  today  this tradition is followed by the heads of the Koviloor mutt. What he uttered became true and all held him in high esteem on account of his divine power of word.  The Koviloor mutt was extended to Thiruvannamalai,  Porulvaithaseri, Thirukkalar, Chidambaram and Thiruppuvanam  and its branches were established at Valavanoor, Mettupalayam, Erumpur, Madurai and at Kariyanoor called as Thatthuvaraya Swamigal mutt, His regime is the golden era of the Koviloor mutt. Kanchi Sri Paramachariar wrote in the journalKalki, praising him as the reincarnation of the St.Thurvasar.