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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.
â¢ Fireplace Type: In this example, a new direct-vent gas firebox is installed in a custom-built surround. In addition to installing the fireplace, pros complete the facade with stone veneer and a wood mantel and lay a custom stone hearth, which adds $1,500 to $2,400 to the job.