The Hawks claimed the Ryman League premier division title despite a goalless draw at Kingstonian.
The point for Lee Bradbury’s men was enough to seal automatic promotion back to National League South after Bognor were held to a 1-1 draw by Met Police.
Jimmy Muitt had given the Rocks the lead but their hopes of overhauling the Hawks were dashed when Will Salmon silenced the Nyewood Lane crowd on 71 minutes.
Jamie Howell’s Bognor now go into the play-offs, with Wingate & Finchley their semi-final opponents.
Meanwhile, a stoppage-time leveller at Concord Rangers condemned Gosport Borough to the drop from National League South.
Alex Pike’s side had come from behind to lead 2-1 thanks to a superb double from Tony Lee.
However, James White’s strike two minutes into time added on dealt the killer blow.
Victories for fellow strugglers Whitehawk and Truro City mean Borough are four points adrift with only one game remaining. Moneyfields lifted the Wessex League premier division title following a 1-0 win over Newport.
Elsewhere, AFC Portchester eased to a 4-1 victory at Verwood Town.
Joe Noakes put the Royals ahead early on before Miles Everett and Alex Baldacchino extended the lead.
Baldacchino then added his second before Verwood grabbed a consolation.
Mark Smith was the hero as Horndean ran out 3-1 winners over Bashley at Five Heads Park.
Smith netted a hat-trick as Michael Birmingham’s side breezed to a 3-1 success.
He fired the Deans in front after just four minutes before lobbing the Bashley keeper to make it 2-0.
Bashley pulled one back but Smith had the last word when he completed his hat-trick after the break.
Fareham Town beat 10-man Blackfield & Langley 3-1.
Ryan Pennery took his goal tally to 48 – and clinched the golden boot – as Baffins Milton Rovers won 4-0 at Totton & Eling in division one.
The striker netted twice after Josh Maddison and River Boam had got the ball rolling.
Petersfield Town lost 3-2 to Arlesey Town in Southern League division one central.