Gas Fireplace Insert Installation · Bellevue · Eastside WA
A gas insert drops into your existing masonry firebox. New stainless liner up the chimney, new gas connection, new surround — and the room changes completely. The lowest-cost path into a modern gas fireplace.
What an insert actually is
A gas fireplace insert is a sealed-combustion appliance designed to slot into an existing masonry firebox. Mechanically, it solves the problem of a wood firebox that's drafty, smoky, hard to start, and impossible to control. Visually, it does something more interesting — it forces a conversation about what that wall could be.
Prime treats every insert install as a room project, not an appliance swap. We pick the unit, the surround material, and the mantel detail together — because if you only change the appliance, you end up with a new firebox sitting inside the same dated wall.
Pick the personality first
Every manufacturer has a posture. Heat & Glo wants you in a clean linear modernist room. Valor cares about radiant heat and traditional proportions. Mendota chases the most realistic flame. Napoleon hits the value/performance corner. The brand decision is a design decision before it's a spec decision.
Heat & Glo Mezzo and Cosmo lines run the cleanest, most linear flame picture on the market. Pair them with a single-material surround — honed concrete, blackened steel, large-format porcelain — in a contemporary great room. Heat & Glo is the safe pick when the room is younger than the chimney.
Valor H5 and L1 inserts trade theatrical flame for honest radiant heat. They're the right answer for a classic West Bellevue or Mercer Island Tudor or Craftsman, where the surround should look like it was always there and the heat should actually warm the room.
Mendota FullView and FV41 inserts run the most lifelike flame and ember bed in the category. When the client’s first sentence is “I want it to look like a real wood fire,” Mendota is usually the conversation starter.
Napoleon GDIX and Oakdale lines deliver real flame quality and modern controls at a more accessible price point. Good fit for secondary rooms, basement remodels, or a great room where the budget is going into the surround and mantel, not the appliance.
Prime also installs Montigo, Travis Industries, Superior, and Heatilator inserts — the four above are where most of our designer-led Eastside installs land. We'll walk you through the right brand fit for your specific room.
Cost, honestly
Compared to a new-build linear fireplace with framing and a new chase, a gas insert install reuses the existing chimney structure and skips framing entirely. That's why insert installs are the lowest-cost path into a modern gas fireplace. The cost driver that actually matters on an insert install is the surround — tile, stone, or stone slab can equal or exceed the unit cost.
We do not publish exact insert install prices because they would be misleading without seeing your firebox, surround scope, and gas line situation. We provide a fixed written estimate after a free in-room walkthrough — the same way we quote every Prime project.
Schedule a free walkthroughWhen an insert isn't the right answer
An insert is the right move on most Eastside masonry fireboxes. It's the wrong move in a few specific cases — and we'd rather tell you upfront than sell you a project you'll regret.
If the firebox or chimney is structurally compromised
Spalling brick, a leaning stack, a cracked smoke chamber — the right move is a structural assessment and likely a full new-build install or rebuild, not an insert dropped into a failing structure.
If you actually want a wood fire
A gas insert is excellent at being a gas appliance. It is not a wood fire. If you genuinely want the smell, the crackle, and the ritual of wood, we'll say so and help you think about an EPA-certified wood insert path instead.
If you're going modernist linear from scratch
When the design vision is a 6-foot floor-to-ceiling linear ribbon flame, an insert in an existing 32-inch firebox can't get you there. The right path is a new direct-vent linear install — the insert is the wrong tool for that brief.
Google reviews
“The technician found a minor problem that I would have overlooked during a chimney inspection. He gave me straightforward repair options and a clear explanation without putting any pressure on me.”
Kathleen Kimura
Verified Google review
“We noticed some cracks in the chimney and weren't sure how serious they were, but they carefully inspected everything and only recommended the repairs that were actually needed. The whole process was smooth and well-organized, and the chimney now looks solid and secure again.”
Emanuel Leavitt
Verified Google review
“I'm really impressed with the service we received for our new pellet stove installation. Everything was done carefully to spec, and they took the time to clearly explain the safety steps, which made us feel confident using it.”
Bruce Cropper
Verified Google review
“The technician spotted minor damage to my chimney crown that I hadn't noticed and quickly took care of it. He explained the repair options clearly and made sure everything was solid, which I really appreciated for his honesty and skill.”
Jean Hill
Verified Google review
“Prime Chimney was suggested by a neighbor, and I now see why. They were easy to book, arrived on time, and completed a thorough job. The technician was courteous and left no mess. Our chimney is clean, safe, and ready for the colder months. Wonderful local enterprise!”
Manuel Laporte
Verified Google review
Common questions
Related
The one-question decision tree — which path is right for your room.
Three real Bellevue install rooms plus the permit workflow we run every project through.
Annual tune-ups, diagnostics, and maintenance to keep the system running long after the install.
Free in-room walkthrough
We come to the room, measure the firebox, walk through the brand-and-surround conversation, and put a fixed written estimate together. No pressure, no canned pitch.