Cost of fireplace insert installation

Looking for cost of fireplace insert 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

Several factors influence this total, including the condition of your chimney, the need for a professional flue liner, and the specific model of insert you choose. If you are converting an old wood-burning hearth to a more efficient gas or electric system, the preparation work will be a key cost factor. We provide exact pricing confirmed free on the call.

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?

What is the 2+10 rule for fireplaces?

Can I install a fireplace myself in St. Louis?

How do you install a fireplace?

The process involves preparing the fireplace opening, setting the unit, connecting it to the appropriate fuel source (gas or wood), and ensuring proper ventilation and clearances. Pros manage all these steps carefully in St. Louis.

How much does it cost to install a fireplace?

Do fireplaces need to be professionally installed?

Yes, professional installation is highly recommended in St. Louis to guarantee safety, optimal performance, and compliance with all local building regulations. This is especially true for gas fireplaces or those requiring new venting.

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

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