Installation of gas fireplace cost

Looking for installation of gas fireplace cost in St. Louis, MO? Call FireplaceInstallation Pros for a contact a provider — no obligation. Licensed, insured certified 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

When you're looking at a new fireplace, the bottom line depends on a few specific things. First, are we working with an existing chimney or venting system, or does everything need to be built from scratch? The type of fuel matters too—gas, electric, or wood-burning units all carry different installation requirements. You also have to consider the finish work, like custom stonework, mantels, or drywall repairs around the unit. Labor complexity is the biggest factor here. We’ll get you the exact pricing confirmed free on the call.

About this service

The installation of gas fireplace cost depends on whether you have an existing gas line or if we need to install a new one. We also look at whether you need a direct vent system or if the unit can vent through an existing chimney. This is a great way to add heat to a living room or bedroom. Exact pricing confirmed free on the call.

Installing a fireplace in the summer might seem unusual, but it is often the most efficient route. You avoid the peak-season rush, which usually means shorter wait times for an appointment. It is the perfect off-season project to ensure your home is ready long before the first chill of autumn hits. We can get the job done quickly while you focus on other home improvements.

Frequently asked in St. Louis

What's the average cost to install a fireplace in St. Louis?

The average cost to install a fireplace in St. Louis depends on several factors. These include the type of fireplace (gas, wood, electric), the complexity of the venting system required, and any necessary structural modifications to your home. The materials chosen for the surround and hearth will also influence the overall price. A professional assessment will provide a precise estimate for your specific project.

Can I install a fireplace myself in St. Louis?

How do you install a fireplace?

Professional fireplace installation involves preparing the designated space, ensuring proper support and framing. The fireplace unit is then carefully positioned and secured. Crucially, the venting system or chimney is installed to safely expel exhaust gases. Gas fireplaces require precise line connections, while wood-burning units need a well-constructed chimney. Finally, the surrounding hearth and mantel are finished according to your design preferences.

How much does it cost to install a fireplace?

The cost to install a fireplace varies based on numerous factors. These include the type of fireplace unit you select, the complexity of the venting system, and any structural alterations needed for your St. Louis home. The choice of finishing materials, such as brick, stone, or tile for the surround, also impacts the price. Obtaining a detailed quote from a qualified installer is the most effective way to understand your investment.

Do fireplaces need to be professionally installed?

Yes, for safety and to meet building codes, professional installation is strongly advised for fireplaces in St. Louis. This is especially true for gas and wood-burning units, which require expert handling of fuel lines, ventilation, and chimney construction. Professional installers ensure that all aspects are compliant and safe, preventing risks like carbon monoxide leaks or fire hazards.

What is the 2 + 10 rule for fireplaces?

The '2-10 rule' is a standard building code requirement for chimney height. It specifies that the chimney must extend at least two feet above the highest point where it passes through the roof and maintain a horizontal distance of at least ten feet from any part of the building that is within three feet of the chimney. This ensures proper draft and prevents fire hazards.

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More on this: NFPA heating safety — heating equipment fire data.