Tiverton Town beat Salisbury 2-0 at the Ray Mac to secure promotion to the Southern Premier.
Michael Landricombe scored after 39 minutes, before Tom Bath doubled the lead nine minutes into the second half.
In the Central Division play-off final, Farnborough beat Barton Rovers 2-0 at home.
And finally in the Premier Division, Leamington came from a goal behind to win promotion. They equalised from the spot in the 90th minute before scoring in extra time.