Luke With opened the scoring for 'Side on 34 minutes, grabbing his third goal of the season.
West Essex then equalised on 74 minutes, to seemingly grab a share of the spoils.
'Side though weren't to be denied as Leon Smith scored with two minutes remaining to grab a late winner.
The result see's Gus Gulfer's side sit in 5th place in the league table.
'Side: Sam Roach, Jak Mochalski, Joshua George, Paul Wright, Leon Smith, George Lutaaya, Michael Ademiluyi, Sam Edwards, Luke With (James Holland-Malcolm), David Laird, Jason Fontaine
Subs not used: Sam Konway, Aidan Lucas, Jide Tijani, Kerkstun MacPherson