Fireplace insert installation cost — St. Louis, MO

Last updated: September 24, 2026

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

This price depends heavily on the fuel type—gas, wood, or electric—and the amount of retrofitting needed for your existing fireplace box. You will also see price differences based on the size of the unit and the finish materials used to seal the surround. We focus on ensuring the insert fits perfectly to maximize efficiency. 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

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

All cities in Missouri →

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

Service area details

Serving all of St. Louis — population 281,754; about 4,565 residents per square mile across 61.7 sq mi.

Neighborhoods served in St. Louis: The Hill, Central West End, Tower Grove, Soulard, Lafayette Square — and every surrounding area.