The triumph arrived less than a fortnight after Woodhouse secured his first senior PDC ranking title, continuing a remarkable run of form that has transformed his season.
Woodhouse was in control for much of the final, racing into a 3-0 lead before Joyce reduced the deficit. The pair traded legs as the match settled, but 'Woody' pulled away in the closing stages, sealing victory with a 160 checkout.
“It’s like buses. You wait for one for ages, then two come along at once,” Woodhouse said after collecting the trophy.
“That was such a tough game. I don’t think me and Ryan played our best darts, but I will take it 100 per cent.
“I felt like this was a good chance for both of us and I didn’t want to let it pass me by, so I tried to be ultra-focused and luckily today I came out on top.”
The 37-year-old had enjoyed an impressive run through the field, beating an improved Cameron Menzies in the last 16 before seeing off Jimmy van Schie and Ricky Evans to reach the final.
“I’m really enjoying my darts at the moment, and to win this is unbelievable. It's absolutely massive,” he said.
“I’m hoping I can kick on now. The World Matchplay is just around the corner, so hopefully my confidence can carry into that.”
Joyce was appearing in his first European Tour final since March 2025. The Englishman defeated Martin Schindler and Niko Springer before thrashing Dave Chisnall in the quarter-finals and edging past Damon Heta in a deciding-leg semi.
However, he was unable to recover after Woodhouse's fast start in Kiel's finale. “I tried my best, but it just didn’t happen today,” Joyce said.
“I knew it was going to be a tough final, and Luke was good early on. He’s a very solid player, very dependable, and it’s hard to play against him.”
Woodhouse's victory makes him the eighth different winner on this season's European Tour, which resumes in Bratislava from 19 to 21 June.
Results
Round three
Jimmy van Schie 6-4 Sebastian Bialecki
Luke Woodhouse 6-1 Cameron Menzies
Kevin Doets 6-3 Justin Hood
Ricky Evans 6-4 James Wade
Wessel Nijman 6-3 Ryan Searle
Damon Heta 6-5 William O'Connor
Ryan Joyce 6-4 Niko Springer
Dave Chisnall 6-5 Gian van Veen
Quarter-finals
Luke Woodhouse 6-3 Jimmy van Schie
Ricky Evans 6-3 Kevin Doets
Damon Heta 6-2 Wessel Nijman
Ryan Joyce 6-1 Dave Chisnall
Semi-finals
Luke Woodhouse 7-2 Ricky Evans
Ryan Joyce 7-6 Damon Heta
Final
Luke Woodhouse 8-4 Ryan Joyce