Issaquah · Highlands · Old Town · design-led install
Old Town masonry conversions, Highlands new-builds, Plateau great rooms — three neighborhoods, three different starting points. Same crew, same process, same written estimate.
Three Issaquah install rooms
Issaquah’s neighborhoods each have their own era and housing type. Old Town, Highlands, and the Plateau represent three distinct install conversations — and three different starting points.
The established neighborhoods north of I-90 have a high concentration of pre-1985 masonry fireplaces in ranches and split-levels. These are among the strongest candidates for gas conversion — existing brick firebox, masonry chimney, and a gas line nearby in most cases. A gas insert with a new surround resets the living room without demo or structural work.
The Highlands has seen significant new construction since 2000 — planned-community homes with open floor plans, 9’–12’ ceilings, and great rooms designed with a fireplace wall in mind. Most Highlands installs are new-build direct-vent or insert for homes that came with a prefab unit. The community’s HOA design guidelines apply to exterior modifications in some sections — we confirm before quoting.
The homes on the Plateau above Issaquah and in the Talus community tend toward larger square footage and design that supports a more substantial fireplace installation — full-height surrounds, built-in cabinetry, linear format units in great rooms with mountain views. The fireplace conversation at these properties often involves the whole wall, not just the insert.
The Issaquah permit workflow
The City of Issaquah has its own permit jurisdiction covering Issaquah proper and Issaquah Highlands. Some Plateau addresses fall under King County jurisdiction rather than the City — we confirm the correct permitting authority before the estimate is written. Every gas fireplace installation requires the applicable mechanical and gas piping permits.
Mechanical permit
City of Issaquah Development Services (or King County for unincorporated addresses) — covers the appliance, venting path, and clearances. Prime confirms the correct jurisdiction and pulls from it.
Gas piping permit
Separate permit for the new gas supply connection. Required for every new gas appliance connection. Pressure-tested before the line goes live.
HOA design review (Highlands)
Issaquah Highlands HOA has design guidelines for exterior modifications in some sections of the community — including direct-vent sidewall termination caps. We confirm whether review is required for your address before the estimate is written.
Washington L&I sticker
State Labor & Industries sticker on every new gas appliance — required statewide regardless of which city or county issues the building permit.
Match the unit to the neighborhood
Issaquah’s neighborhoods span five decades of construction. The install conversation starts with the era and design vocabulary of the specific home.
Old Town, Issaquah proper
Pre-1990 masonry homes
Masonry fireplaces are common in the original Issaquah neighborhoods and are strong candidates for gas insert conversion. Existing chimney becomes the liner path; existing firebox surround is updated or replaced. Gas line is usually nearby. These are often one-day installs.
Issaquah Highlands, Cougar Mountain Ridge
1990s–2010 planned developments
A mix of factory-built prefab fireplaces and homes built without fireplaces. Prefabs convert via brand-matched inserts. New-build direct-vent is the path for homes that came without a fireplace. HOA design guidelines apply in some Highlands sections.
Talus, upper Plateau
Post-2010 larger homes
Larger square footage and great-room scales that support wide linear units and full-height surround installations. These projects often involve the highest surround scope — full built-ins, custom millwork, and materials sourced with longer lead times. The design conversation starts with the room, not the appliance.
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
Next steps
The most common path for Old Town Issaquah masonry fireplaces — and the brand-personality framework for choosing a unit.
Three candidacy scenarios, the liner process, and what’s actually included in a gas conversion estimate.
The four cost drivers for any gas fireplace project on the Eastside — insert vs. direct-vent, surround scope, gas line work.
Free in-room walkthrough · Issaquah
We come to your Issaquah home, assess the existing fireplace or install wall, confirm permits, and put together a fixed written estimate with every line item. Old Town, Highlands, or Plateau — same crew, same process.