Agni Karthari is not an auspicious time in Hindu Astrology for dwelling wells, bores, constructing slabs for houses, etc. It is auspicious for Grihapravesha and other house construction related works.
In 2020, Agni Karthari begins on May 11, Monday, when Surya Narayana Swamy (Sun God) enters into Krittika Nakshatra 1st Pada and ends on May 25, Sunday, when Sun God exits from Krittika Nakshatram.
Agni Karthari Arambham – May 11, 2020 (Krishna Paksha Chaturthi in Vaishakha Masam)
Agni Karthari Thyagam – May 25, 2020 (Shukla Tritiya in Jyeshta Masam).
The period of Vastu Karthari (Dollu Karthari) and Agni Karthari are considered as Agni Natchathiram (Agni Nakshatram) (Katiri Veyil) in Tamil calendar & Malayalam calendar.