Gas insert fireplace installation cost

Looking for gas insert fireplace installation cost in St. Louis, MO? Call GasFireplaceInsert Services for a contact a provider — no obligation. Licensed, insured certified gas fireplace pros serve St. Louis and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

The final price for a new gas fireplace depends on a few moving parts. First, you have to consider whether you are installing a unit into an existing chimney or creating a new opening in a wall, which adds labor. The type of venting required and the current proximity of your gas lines also play a big role in the complexity of the install. Aesthetic choices, like premium stone surrounds or remote-controlled flame features, will adjust the total as well.

About this service

The cost to install a gas insert depends on your home’s venting setup, the size of the unit, and any necessary gas line modifications. You will need this service if you are looking to convert an existing wood-burning masonry fireplace into a more efficient, cleaner-burning gas system. An inspection of your chimney and flue is required before we start to ensure safety and code compliance. Exact pricing confirmed free on the call.

Many people think about fireplaces only in the cold, but summer is actually a great time to schedule an installation. Since demand is lower, you can often get your project finished without the long wait times seen during the peak winter months, making sure you are ready before the first frost arrives.

Frequently asked in St. Louis

What's the average cost of a gas fireplace insert?

Can you put a gas fireplace insert in an existing fireplace?

Yes, that's their main purpose. Inserts are built to fit directly into the firebox of your current wood-burning fireplace. The specialists will ensure a safe and proper installation for your St. Louis residence. It's a common and effective upgrade.

What are the disadvantages of a gas fireplace insert?

Some people miss the sound and smell of burning wood. The initial investment can be higher than basic heating options. You are also dependent on a gas line. However, the convenience and consistent heat are significant advantages for many homeowners.

What is the best gas fireplace insert for 2026?

The ideal insert for your St. Louis home depends on your heating needs and aesthetic preferences. Factors like energy efficiency and desired flame appearance are key. The professionals can guide you through top-performing models suited for your lifestyle.

What is the lifespan of a gas fireplace?

What are the disadvantages of a gas fireplace?

Gas fireplaces don't typically provide the same intense heat as a central furnace. You are dependent on a gas supply. The visual experience differs from a wood fire. However, for many in St. Louis, the ease of use and controllable warmth are significant benefits.

Also serving nearby: O Fallon · Springfield · Columbia · Champaign · Peoria

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More on this: CSIA gas appliance guidance — venting and inspection.