Garry Monk made a triumphant return to his old stamping ground of Birmingham to emerge with all three points.
A Barry Bannan penalty was the only goal of the game but hardly told the story of the St Andrew’s clash.
Wednesday were in control throughout save a late, flurry from Blues, who were flattered overall by the 1-0 scoreline.
Monk’s men may well have merited a more convincing result but the most telling statistic was the three points in the travel bag.
The Owls almost made the perfect start at St Andrew’s inside seven minutes but Adam Reach was denied a maiden goal of the season by a fabulous save.
Reach pulled the trigger from all of 25 yards only to see Neil Etheridge fly across his goal to acrobatically tip over the bar.
Then, 10 minutes later, Wednesday went closer still from a set piece. Josh Windass picked his spot over the wall and this time Etheridge was beaten but the ball smashed against the post.
The Owls continued to pour forward and Callum Paterson glanced a Moses Odubajo cross inches wide just before the half-hour mark.
For their part, Birmingham struggled to make any kind of real impact in the final third and Cameron Dawson was untroubled throughout a one-sided first half.
Wednesday began the second period in similar fashion and Etheridge was immediately tested by Bannan.
The keeper was equal to the long range shot but was eventually beaten four minutes into the resumption.
Paterson was tripped in the box by Adam Clayton, the referee pointed straight to the spot and Bannan slotted the Owls in front.
It was no more than they deserved and the one-way traffic remained as the second 45 unfolded.
Wednesday were comfortable in possession as Blues were pinned into their own half for long periods.
When they did move forward the Owls soon regained possession and the game reverted to type.
The only thing missing was a second goal to put the contest to bed but the danger was Birmingham producing on the counter.
And they created a clear chance with nine minutes to go when George Friend climbed to head the wrong side of the upright.
Then, moments later, substitute Jonathan Leko had a golden opportunity to equalise but Joost van Aken was in the right place at the right time to expertly deflect wide from six yards.
A leveller would have been unjust on the Owls but that was as good as it got for Birmingham as Bannan’s spot-kick proved enough for victory.
Wednesday: Dawson, Odubajo, Flint, van Aken, Luongo, Harris, Bannan, Reach, Kachunga (Dele-Bashiru 84), Windass (Marriott 77), Paterson (Pelupessy 90)