Installation of gas fireplace cost

Looking for installation of gas fireplace cost 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.

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?

The average cost to install a fireplace in St. Louis can vary significantly depending on the type of fireplace, the complexity of the venting system, and any necessary modifications to your home. Factors like the specific brand and model will also impact the final price. Pros can provide an accurate quote after assessing your needs.

What is the 2 + 10 rule for fireplaces?

Can I install a fireplace myself?

How do you install a fireplace?

Fireplace installation involves creating the opening, placing the firebox, connecting gas lines or building a chimney, and ensuring proper ventilation and safety features are in place. The specific process depends on the fireplace type and your home's existing structure. Professionals expertly manage these tasks.

How much does it cost to install a fireplace?

Do fireplaces need to be professionally installed?

Yes, particularly gas and wood-burning fireplaces, professional installation is crucial for safety and compliance with building codes. This ensures correct venting, secure gas connections, and structural integrity, minimizing fire hazards. Licensed installers in St. Louis are essential for this.

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

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