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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 for a natural gas fireplace can cost anywhere from $300 to $1,200 depending on the availability of natural gas and electricity in the location where you want the fireplace, as well as a number of other factors.ood burning fireplaces tend to be less expensive than natural gas or propane on the low end, but much more expensive on the high end. Most masonry fireplaces cost $5,000 or more due to the labor required to install each individual brick or stone within your home.