Leeds club Chapel Allerton won the Premier Squash League with a 3-2 victory over Derbyshire side Duffield in Tuesday's final in Nottingham.
Duffield and England's Tania Bailey crushed Carrie Ramsey in the first tie.
But wins by Chris Simpson, Aaron Frankcomb and Alister Walker gave Chapel Allerton an unassailable lead.
Chapel Allerton team manager Neil Guirey said: "What's really pleasing is that everyone in the team is a genuine Chapel Allerton player."
Benz-Bavarian Duffield were hoping to become the first club to win the league title for a record fourth time.
I hope this will put us on the map as an elite club
Chapel Allerton team manager Neil Guirey
However Chapel Allerton, back in the Premier Squash League after a 21-year absence, recovered from a bad start to claim the title.
Guirey added: "This success will really be good for us, especially after the £1m refurbishment the club has recently undergone.
"Tonight has been really spectacular - it was quite difficult to predict how we'd do at the beginning of the season, even though I knew we had a good squad."
Duffield, champions in 1998, 2006 and 2007, took the first rubber when Bailey beat Ramsey 11-2, 11-1, 11-3.
Chapel Allerton then took a 2-1 lead when Simpson fought back from 2-0 down to edge out Joel Hinds 6-11, 2-11, 11-8, 11-2, 11-5 and Frankcomb won another epic game against Andrew Whipp 11-8, 9-11, 11-8, 4-11, 14-12.
And Chapel Allerton made sure of the title when Duffield's Joey Barrington retired hurt against Walker in the fourth match-up of the evening.
Nick Matthew won the final dead rubber for Duffield, beating Frenchman Thierry Lincou.
Guirey said: "It's also good for Yorkshire squash that we've now established ourselves in the most prestigious league in the world.
"We've had great local support throughout the season - in fact we could have sold out three times over.
"But I hope the biggest knock-on effect of this will be to expand the professional side of the club, and attract more elite international players to Chapel Allerton.
"I hope this will put us on the map as an elite club."