Leverstock Green gained a crucial three points with their first away league win of the season as an early goal was enough to see them through at Harefield United.
Harefield were bottom of the league at start of play, but Levy were only three points above them, so the result opens up a bit more of a gap to the drop zone.
The first chance of the game fell to the home side in the fourth minute as a cross from Craig Heskey was taken down by Perry Dicker, who turned and shot but Craig Garrett saved it with his feet.
However, it was Levy who took the early lead. After Casey Linsell had been brought down just outside the penalty area, Curtis Donaldson curled over a free-kick which was diverted into the net, with Linsell credited with the goal.
Harefield had another chance on 22 minutes when the ball ran across the penalty area to Heskey, who had the goal at his mercy, but Jack Watts slid in to divert his shot wide of the post.
Six minutes later Dicker was just over the bar with a curling effort, and on 32 minutes Donaldson hit a good effort narrowly wide.
On 39 minutes Harefield were reduced to 10 men when Sean Mangan was shown a straight red for raising his arm at Sam Clark. The two had tangled seconds earlier when challenging for a through-ball, and the linesman spotted the off-the-ball incident that followed.
For much of the second half it was Harefield who were pushing forward, but thanks to the concentration and discipline of the Levy back four, Garrett had little to do beyond routine handling, which was done faultlessly as Levy held on for the vital three points.