Chatham Town booked their place in the Isthmian Premier play-offs – meaning Kent rivals Dartford miss out.
Chats confirmed a top-five finish with a game to spare after cruising to a 6-0 victory at relegated Potters Bar, while Dartford can finish no higher than sixth after conceding a late equaliser in a 2-2 draw at Chichester.
Sam Sene-Richardson and Stanley Oldfield scored inside eight minutes for Chatham, and Oldfield struck again just before the break.
Tope Fadahunsi, Kofi Anokye-Boadi and Ben Allen completed the scoring in the second half.
Dartford came from a goal down to lead 2-1 at Chichester, courtesy of Joe Tennent and Eddie Dsane.
But an 84th-minute leveller from Joe Clarke, adding to Isaac Bello’s opener, consigned Darts to a third successive season at Step 3.
Welling confirmed survival by coming from two goals down to win 3-2 at Cray Wanderers.
The Wings, virtually safe after their midweek win over Potters Bar, trailed to first-half goals from Ola Ogunwamide and Max Fiddes.
But Noah Stewart launched the fightback, Ayman El-Mogharbel levelled and Ibby Akanbi scored a last-minute winner as Ryan Maxwell’s side climbed to 15th.
Ben Mason scored a last-minute equaliser for champions Folkestone in a 1-1 draw at Cray Valley, a result that leaves the Millers needing a win on the final day to have any chance of staying up.
Alfie Newby broke the deadlock midway through the second half but the hosts were denied victory.
Ramsgate lost 2-0 at home to struggling Hashtag in their first game since the shock sacking of Lee Martin.
Nathan Smith and Bilal Sayoud scored for the visitors midway through the second half.
Sittingbourne need a point on the final day to clinch an Isthmian South East play-off place after winning 2-0 at Hassocks.
Mitchell May struck midway through the first half and Derek Asamoah doubled the lead before half-time.
They moved three points clear of Faversham in the race for fifth spot after the Lilywhites were held to a 2-2 draw at Sevenoaks.
Tashi-Jai Kwayie’s early penalty put the visitors in front but goals from Warren Mfula and Jaden Perez gave Oaks a 2-1 advantage before Tommie Fagg equalised.
Sheppey’s survival bid is going down to the final day after slipping to a seventh successive defeat.
They lost 2-1 at home to Crowborough in front of a big home crowd of 905 – boosted by the offer of free entry.
Jacob Lambert cancelled out Harry Forster’s opener but Elliott Duncan won it for the visitors.
The Ites are two points clear of Hassocks, who occupy the final relegation spot, going into the last game at second-placed AFC Croydon.
VCD Athletic’s last home match before folding ended in a 4-1 defeat by Eastbourne Town.
The Vickers were three down by the time Reece Deakin bagged an 89th-minute consolation but the visitors added an injury-time fourth, giving Austin Pugh the honour of scoring the final goal at Oakwood.
Seventh-placed Margate continued their strong late-season form with goals from player-boss Greenhalgh, Kai Garande and Louie Atkins in a 3-1 home win over Erith Town.
Jerome Jayaguru scored for the Dockers.
An early goal from Lorne Bickley saw Deal Town beaten 1-0 at home by Jersey Bulls.
Ashford came from a goal down to lead third-placed AFC Whyteleafe before slipping to a 3-2 defeat.
Goals from Gary Lockyer and Louis Collins put the Nuts & Bolts 2-1 up but Mannie Mensah, Palace Francis and ex-Dover man Moses Emmanuel gave the hosts victory.
Kamani McFarlane 76th-minute penalty earned a 1-1 draw for Herne Bay away to a Hastings side who led through Max Walsh.
Callum Corbin’s injury-time goal gave relegated Beckenham 2-1 victory at Broadbridge Heath.
