Chow began his professional career at Citizen, a newly promoted First Division club, in the 2004–05 season.

However, as a young player, he failed to compete for a place in the starting line-up, only mostly played in the Senior Shield.

Chow made a return to the First Division in the 2006–07 season, joining Hong Kong 08, which was formed by a team of young players to let them gain match experiences before competing in the 2008 Olympics qualifiers.

As a third-tier club, however, Shatin had many players with First Division playing experience, including Lee Wai Man who was the current most capped Hong Kong national team record player, Ng Yat Hoi, Kwok Yue Hung and so on.

On the other hand, Shatin successfully defended their Junior Shield title, defeating Sham Shai Po 2–0 in the final.

As a key member in the team, he only missed one game throughout the season, helping the club gain promotion to the First Division.

Soon later, Pontic was punished and had their club qualification cancelled, meaning that they were not able to compete in every league and cup organised by the Hong Kong Football Association.

Under coaching of Fung Hoi Man, Chow was a usual starter for the club, featuring 20 league matches and scoring 2 goals.

The 2012–13 season was a year of breakthrough for Chow Ka Wa, as his impressive performance and co-operation with fellow team-mates Dieguito, Jonathan Carril and Ip Chung Long attracted people's eyes.