[1] Pétur helped Skallagrímur reach the 2006 Úrvalsdeild finals, scoring 21 points in the fourth and deciding game against defending champions Keflavík in the semi-finals.

Despite not fielding a foreign player, his squad managed to stave off relegation during the 2010–2011 Division I season and reach the final eight of the Icelandic Basketball Cup.

In his first season he led KFÍ's men's to the Division I championship and promotion to the Úrvalsdeild karla, while also reaching the final four in the Icelandic Basketball Cup where they lost to eventual champions Keflavík.

[9] After a 10th-place finish in the 2011-2012 season, where the club staved off relegation with a victory in their last game, Pétur left KFÍ when his contract was not renewed.

[15][16] In June 2021, Pétur guided Vestri back to the Úrvalsdeild after the team defeated Hamar in the 1. deild promotion finals.