Fourth-placed Whitley Bay threatened to spoil the party when taking a 13th minute lead through Leanne Anderson.
But Rachel White levelled 20 minutes later at the Dual Seal Stadium.
The game remained tense for the 197-strong crowd until Jodie Redgrave gave the hosts a 78th-minute lead but they still had to endure some nerves as that was cancelled out by Steph Ord with 3 minutes left.
But the draw was enough to take Brighouse out of reach of second-placed Barnsley and clinch a first ever promotion to the FA WPL, having won 18 and drawn their other 4 league games.
Pictured – Brighouse with their league trophies.
