Gas fireplace insert installation cost

Looking for gas fireplace insert installation cost in St. Louis, MO? Call FireplaceInstallation Experts 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 look at getting a fireplace installed, several variables change the final bill. The biggest factor is the type of unit you choose—gas, wood-burning, or electric models all have different requirements. You also have to consider your home's existing ventilation and whether a chimney or direct-vent pipe needs to be built from scratch. If we need to run new gas lines or electrical circuits, that adds labor time and complexity. Your exact pricing is confirmed free on the call.

About this service

An insert is designed to fit inside your existing masonry fireplace. The cost fluctuates based on the size of the insert, the condition of your current chimney, and the complexity of the gas line hookup. If your chimney requires a new liner, that adds to the total labor. Exact pricing confirmed free on the call.

Many people overlook summer for fireplace installations, but it is actually an ideal time. Because demand is lower, you can often secure a time slot that fits your schedule perfectly. It gives us plenty of time to focus on the technical details of your installation, ensuring a smooth process before the busy season hits.

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 in St. Louis?

Professional installation involves preparing the fireplace opening, installing the unit, ensuring proper clearances (like the 2+10 rule), connecting to gas or wood, and setting up safe venting systems. The pros in St. Louis meticulously handle all these steps.

Do fireplaces need to be professionally installed in St. Louis?

What is the 2+10 rule for fireplaces?

The 2+10 rule generally pertains to clearances. It typically means at least 2 inches of clearance from the fireplace opening's front edge and 10 inches from its sides to any combustible materials. Professionals in St. Louis always follow these safety guidelines.

How much does it cost to install a fireplace in St. Louis?

The price is determined by the specific fireplace model, your home's existing structure, and any required modifications for gas or venting. A professional consultation in St. Louis will provide an accurate estimate for your unique project.

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

All cities in Missouri →

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