Gas fireplace installation cost.

Gas fireplace installation cost on the Eastside is driven by four variables: unit choice, venting path, surround scope, and gas line work required. A gas insert into an existing masonry firebox is the lowest-cost path. A new-build direct-vent linear fireplace with custom stone surround and a new gas line is the highest-cost path. Prime provides a fixed written estimate after a free in-room walkthrough — the number varies too much by project to quote meaningfully without seeing the room.

A gas insert installation reuses the existing masonry firebox and chimney, making it the most cost-efficient path into a modern gas fireplace. The cost variables are unit choice, surround scope, and whether the gas line requires new work. Prime provides a fixed written estimate after a free walkthrough.

The City of Bellevue requires a mechanical permit and a gas piping permit on every new gas fireplace installation. Permit fees are set by the City and subject to change; the current fee schedule is published at the Bellevue Development Services Center. Prime pulls every permit and includes the estimated permit fees in the written estimate before work begins.

If the home already has a masonry fireplace, a gas insert is the lowest-cost path — it reuses the existing firebox and chimney, minimizing framing and venting work. If there is no existing fireplace, a direct-vent unit through an exterior wall avoids the cost of a full new chimney chase. In both cases, a simpler surround and shorter gas line run keep costs lower. Prime walks through all three paths at the free in-room walkthrough.

Yes — surround scope is one of the four main cost drivers. A simple tile face or painted millwork panel adds relatively little. A full-height stone slab, custom book-matched marble, or a built-in millwork cabinet can add significantly. The surround decision is part of the design conversation at the walkthrough.

A complete estimate includes: the unit (make, model, BTU output), venting assembly, gas line work (if required), surround and mantel, permit fees, and a homeowner walkthrough. Prime’s estimates are fixed — what’s in the estimate is what you pay.

Gas fireplace conversion cost depends on which path makes sense for the room. The most common conversion is a gas insert: the existing brick firebox stays, a stainless co-linear liner runs up the flue, a new gas appliance drops in, and the surround is updated. This is less disruptive than a full replacement and typically the lower-cost path. A full conversion — new framing, new direct-vent unit, new surround — costs more but gives you full control over unit choice and flame presentation. Both paths require a City mechanical permit and gas piping permit. See the full wood-to-gas conversion guide for the detailed scope breakdown.

Gas fireplace replacement cost depends on the scope of the swap. Replacing an insert with a newer model in the same opening is straightforward — the firebox stays, the liner may be reused if it passes inspection, and cost is primarily unit plus connection labor. Replacing a full direct-vent unit involves removing the existing appliance, installing the new one, and updating venting if the new unit’s spec requires it. Adding a surround upgrade at the same time increases scope but is the right moment to do it — the wall is already open. Prime assesses what can be reused at the free walkthrough and prices everything fixed.

Installed gas fireplace prices — unit, venting, gas line, surround, and permits combined — vary significantly by project. A gas insert into an existing masonry firebox with a simple tile surround is the lowest all-in price. A new direct-vent linear with custom stone surround, new chase, and gas line from the meter is at the high end. The brand price table above shows unit-only MSRP; installation labor, venting assembly, surround materials, and permit fees are on top of that. Prime provides a fixed all-in estimate after a free in-room walkthrough — no ranges, no change orders.

Gas log installation cost is lower than a full gas insert because gas logs use the existing masonry firebox and chimney without modification — no liner, no appliance swap, no surround work. The cost is primarily the log set, gas line connection, and required permits and pressure test. Gas logs are vented (damper stays open), produce less heat than a sealed insert, and cost significantly less to install. If you’re choosing between gas logs and a gas insert, Prime walks through both at the walkthrough — see the gas logs page for the full comparison.