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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.
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. Or, opt for a vent-free gas fireplace for $400 or so. Hiring a professional to install a gas line or a connection to a propane tank adds about $1,000.