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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.
An existing wood-burning fireplace can be converted to gas with the insertion of gas logs, which look like real wood but are made of non-flammable materials. Vented gas logs (need a working chimney) run about $300-$550, and ventless/unvented gas logs (without a working chimney or pipes) are $350-$600, with installation estimated at $200-$350 for a basic project, according to Hearth.com. An important part of installation is hiring a licensed contractor to install a gas outlet in the firebox.