An agonising miss for Macquarie's Glen Schein inside the first 15 minutes suggested it was going to be a game of inches but that wasn't the case as the minor premiers ran out dominant 5-0 winners.

The victory, highlighted by a goal of the year contender from Connor Crain late one, ensured an all-Dubbo meeting with the Bulls in next weekend's decider.

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There were some physical clashes early in Saturday's semi-final, Macquarie's Justin Sutton on the receiving end at times, so it was fitting it was he who scored the first goal when picking out the top corner from a free-kick.

With the pressure on the visitors, Macquarie began to find the space near the goals and it created an opportunity for a Connor Crain pass to slice through to the boot of Jesse Spang for the finishing touch.

The Workies side further harmed its chance late in the first half when giving away a penalty and Spang put it away to put Macquarie in complete control.

Lithgow were able to restart some momentum late in the first half, but two cheaply given away possessions turned the pressure back around on them just as quickly.

As frustrations began to mount for the scoreless visitors, the agony on the scoreboard continued as a late break right in the final moments of the first half provided Will Grant with a break to slot through another goal.

Coach Paul Crain led the team's celebrations after the game, but there was no early rejoicing for the minor premiers, remaining clear and focused throughout the game's two stages.

"The boys were really focused, we had a really, really set-up this week just gone after a disappointing result against Panorama, we knew the boys were better than that and they came out fired up today," Crain said.

"It's a great game for us and I think the result speaks for itself, it was a great performance."

Spatters of rain and low-light conditions added to the tension in the game's second half, with Lithgow well on the back foot and applying pressure early.

Despite the effort, there was no relief for the beleaguered visitors, with the Macquarie back-line holding fast and providing plenty of turnovers in possession.

A late goal mid-way through the second half boosted Macquarie's total for the season one further, with Connor Crain catching a ball on the return and booting it from near the half-way line to provide one of the goals of the season.

Lithgow's assistant coach Matt Nunan said it was disappointing to see the result get away from his side.

"It's been Macquarie's year, I think, they're a very quality side and they showed up today, I think we might have shied away from it a little bit," Nunan said.

"Maybe the occasion was too much for us, but we've got to be better than that, we were losing the ball too easily and they really capitalised on that."