Poole Town beat Bemerton 3-0 on Saturday to win the Wessex Premier League and gain promotion to Zamaretto League Division One South & West.
With seven games left to play Poole won the title on 91 points to end a 19-year absence from the Southern League.
Poole boss Tom Killick told BBC Radio Solent: "We know the Southern League will be a different kettle of fish but we aren't daunted by the task.
"The aim is getting Poole to the next level and we've finally done that."
Poole have been denied promotion for the last two seasons because the facilities at their Tatham Ground home were unsuitable but last week the stadium passed a ground inspection thus allowing the club to compete in the Southern League next season.
But Killick says he is more focussed on the club's long-term objectives, including building a new stadium at Bearwood Park and retaining the current crop of players.
"Winning the league is satisfying and getting Tatham to the standard required to the league above obviously enables us to go up this season but it's more important to get a new stadium built," he said.
"That will open up a lot more opportunites and new revenues for the club so for our long-term future the new ground was completely necessary.
"The next big thing I want to do is retain the group of players I've got, that's first priority.
"I think this group have been brilliant and I want them to stick together and have a go at that league together because they deserve the opportunity."