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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 will vary depending on the specific type of fireplace you want to install. The most popular model is the traditional, wood-burning fireplace, but there are also electric fireplaces and gas fireplaces. In general, the average fireplace installation cost is roughly $2,000. However, since there are various types and situations, the price can increase up to $5,000. Furthermore, if ventilation or walls must be added, your fireplace installation may exceed the average above.