Cost of a gas fireplace installation

Looking for cost of a gas fireplace installation in St. Louis, MO? Call FireplaceInstallation Solutions 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

Local housing snapshot: St. Louis, MO

Population: about 293,000
Median year homes were built: 1938
Homes built before 1980: 86%
Owner-occupied homes: 45%

Older homes can mean different materials, wiring, venting or permit needs. Mention your home's age when you contact a provider.

Source: U.S. Census Bureau, American Community Survey 2019–2023 5-year estimates.

What affects the price

When you start planning a fireplace installation, the final bill depends on a few major factors. Choosing between a simple electric unit, a gas insert, or a full wood-burning masonry build creates the biggest difference in cost. You also have to consider the existing setup of your home; running new gas lines or venting through a roof will naturally add labor hours compared to a straightforward swap. Finishing materials like custom stonework or mantel pieces also shift the total.

About this service

The total cost of a gas fireplace installation covers the unit itself, the labor for gas line connections, and the necessary venting to the exterior. If you have an existing masonry fireplace, an insert is often the most cost-effective way to upgrade. We will look at your gas pressure and venting path to give you a clear picture.

Most people do not think about fireplaces in the summer, which makes it the best time for a stress-free installation. You will likely find more convenient appointment times and faster project turnaround. It is the perfect window to handle masonry or venting work while the weather is dry and clear, keeping the process clean and efficient for your home.

Frequently asked in St. Louis

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

Can I install a fireplace myself in St. Louis?

How do you install a fireplace?

Professionals assess your space, the chosen fireplace type, and the necessary venting. The installation includes safely connecting gas or electric lines, ensuring proper airflow, and securing the unit. They handle all the technical aspects to ensure a safe and efficient setup for your St. Louis home.

How much does it cost to install a fireplace?

Do fireplaces need to be professionally installed?

What is the 2 + 10 rule for fireplaces?

The 2+10 rule dictates minimum clearances to combustible materials around a fireplace. Generally, it means 2 inches of clearance on the sides and 10 inches at the front. Professionals ensure these critical safety clearances are followed during installation in St. Louis homes.

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

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