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1 Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
Costs of a Gas-Burning Fireplace. A fireplace unit that burns natural gas or propane runs about $2,000 for the basic materials package. Installation and finishing typically add $2,500. Cost saver tip: Switch to a simpler surround and mantle, and get a direct-vent fireplace so you donât need a chimney.