On January 29, 2016, after being out of the game for over two years, Carlwell signed with the Perry Lakes Hawks for the 2016 State Basketball League season.
He made his debut for the Hawks on March 24, coming off the bench to score six points in eight minutes in a 107–88 win over the Mandurah Magic.
In his fourth game for the Hawks on April 9, Carlwell recorded 20 points and 21 rebounds in a 100–94 overtime loss to the Stirling Senators.
On May 15, he had 23 points and 20 rebounds in a 116–90 win over the Kalamunda Eastern Suns.
On May 28, he recorded 26 points and a season-high 23 rebounds in a 101–81 loss to the Rockingham Flames.
On June 4, he scored a season-high 30 points in a 114–88 win over the Willetton Tigers.
In the Hawks' regular-season finale on July 29, Carlwell had his fourth 20/20 game of the season with 26 points and 20 rebounds in a 102–96 win over the Suns.
The Hawks finished in eighth place with an 11–15 record and lost 2–1 to the Cockburn Cougars in the quarter-finals.
In 28 games for the Hawks in 2016, Carlwell averaged 18.3 points, 12.1 rebounds, 1.9 assists and 1.7 blocks per game.

Carlwell re-joined the Hawks for the 2017 season, coming into the new year better prepared and in much better shape.
In the Hawks' third game of the season on March 31, Carlwell recorded 24 points and 15 rebounds in a 97–90 win over the Cockburn Cougars.
On April 28, he recorded season highs of 28 points and 20 rebounds in a 90–85 win over the Perth Redbacks.
The Hawks finished the regular season in eighth position with a 12–14 record and lost 2–1 to the Willetton Tigers in the quarter-finals, with Carlwell recording 27 points and 15 rebounds in a game one win.
He appeared in all 29 games for the Hawks in 2017, averaging 15.48 points, 9.83 rebounds and 1.17 assists per game.

Carlwell entered the 2018 season ready to deliver a championship to the Hawks.
On April 7, he scored a season-high 24 points against the Rockingham Flames.
The Hawks started the season with a 6–8 record, before going on a 12-game winning streak to finish in fourth place with an 18–8 record.
Carlwell helped the Hawks advance through to the SBL Grand Final, where they defeated the Joondalup Wolves 94–87.
Carlwell won his second SBL Championship behind what was a season-best game of 21 points and 18 rebounds.
He appeared in all 33 games for the Hawks in 2018, averaging 9.97 points, 7.52 rebounds and 1.06 assists per game.

Carlwell returned to the Hawks in 2019 as a non-restricted player, having qualified to play as a local.
On May 3, he scored a season-high 18 points against the Suns.
He helped the Hawks finish the regular season in fifth place with an 18–8 record, before reaching the semi-finals, where they lost 2–0 to the Wolves.
He appeared in all 30 games for the Hawks in 2019, averaging 9.3 points and 6 rebounds per game.
On January 29, 2016, after being out of the game for over two years, Carlwell signed with the Perry Lakes Hawks for the 2016 State Basketball League season. He made his debut for the Hawks on March 24, coming off the bench to score six points in eight minutes in a 107–88 win over the Mandurah Magic. In his fourth game for the Hawks on April 9, Carlwell recorded 20 points and 21 rebounds in a 100–94 overtime loss to the Stirling Senators. On May 15, he had 23 points and 20 rebounds in a 116–90 win over the Kalamunda Eastern Suns. On May 28, he recorded 26 points and a season-high 23 rebounds in a 101–81 loss to the Rockingham Flames. On June 4, he scored a season-high 30 points in a 114–88 win over the Willetton Tigers. In the Hawks' regular-season finale on July 29, Carlwell had his fourth 20/20 game of the season with 26 points and 20 rebounds in a 102–96 win over the Suns. The Hawks finished in eighth place with an 11–15 record and lost 2–1 to the Cockburn Cougars in the quarter-finals. In 28 games for the Hawks in 2016, Carlwell averaged 18.3 points, 12.1 rebounds, 1.9 assists and 1.7 blocks per game.
Carlwell re-joined the Hawks for the 2017 season, coming into the new year better prepared and in much better shape. In the Hawks' third game of the season on March 31, Carlwell recorded 24 points and 15 rebounds in a 97–90 win over the Cockburn Cougars. On April 28, he recorded season highs of 28 points and 20 rebounds in a 90–85 win over the Perth Redbacks. The Hawks finished the regular season in eighth position with a 12–14 record and lost 2–1 to the Willetton Tigers in the quarter-finals, with Carlwell recording 27 points and 15 rebounds in a game one win. He appeared in all 29 games for the Hawks in 2017, averaging 15.48 points, 9.83 rebounds and 1.17 assists per game.
Carlwell entered the 2018 season ready to deliver a championship to the Hawks. On April 7, he scored a season-high 24 points against the Rockingham Flames. The Hawks started the season with a 6–8 record, before going on a 12-game winning streak to finish in fourth place with an 18–8 record. Carlwell helped the Hawks advance through to the SBL Grand Final, where they defeated the Joondalup Wolves 94–87. Carlwell won his second SBL Championship behind what was a season-best game of 21 points and 18 rebounds. He appeared in all 33 games for the Hawks in 2018, averaging 9.97 points, 7.52 rebounds and 1.06 assists per game.
Carlwell returned to the Hawks in 2019 as a non-restricted player, having qualified to play as a local. On May 3, he scored a season-high 18 points against the Suns. He helped the Hawks finish the regular season in fifth place with an 18–8 record, before reaching the semi-finals, where they lost 2–0 to the Wolves. He appeared in all 30 games for the Hawks in 2019, averaging 9.3 points and 6 rebounds per game.
Brian Carlwell