Fireplace Remodel in Brentwood: Written Report, Licensed Technicians

Most homes along the Pacific Palisades hillside and through the Riviera section were built between the 1950s and 1980s with factory-built prefab fireboxes. These units have a 20- to 30-year lifespan, and the majority are well past it. When Heritage Chimney Care gets a call from a Brentwood homeowner about a remodel, the real question is usually whether to patch the existing prefab or convert to a full masonry firebox. A straightforward surround and mantel refresh on a working prefab runs $4,500 to $8,000. A full prefab-to-masonry conversion, which includes demolition of the old zero-clearance unit, construction of a new firebrick firebox and flue liner, and a finished surround, typically lands between $15,000 and $28,000 depending on stone selection and whether you add a gas line during the project.

That price range is wide because scope varies. A Sunset Mesa home with a single-story exterior chimney chase is a simpler tearout than a two-story Riviera section build where the old prefab vents through the roof at 24 feet. Gas conversion during the remodel is common here. Brentwood homeowners who want the look of real flame without storing firewood often pair the new masonry box with a vented gas log set. We handle the gas line rough-in, the firebox sizing to meet current NFPA 211 clearance-to-combustibles requirements, and the final city inspection. If you're considering a gas log set instead of a full conversion, our fireplace gas logs page walks through the options and costs for that route.

One cost factor specific to this area: seismic reinforcement. Brentwood sits close enough to the Santa Monica fault that any new masonry firebox needs steel reinforcement and a poured concrete footing per Los Angeles building code. Heritage Chimney Care includes structural engineering review in every conversion estimate so there are no surprise change orders after demolition day.

The project starts with a Level 2 inspection using a camera scan of the existing chase and flue. We're looking at the condition of the framing around the old prefab unit, any earthquake micro-cracking in the chase structure, and whether the existing hearth pad can support masonry weight or needs replacement. In Pacific Palisades hillside homes especially, we often find that the original chase was framed with minimal fire-blocking, something that passed code in the 1960s but falls short of current Los Angeles requirements. This inspection determines whether we can reuse the existing chase or need to reframe sections of it.

After demolition of the prefab box and its air-cooled flue pipe, our crew pours a reinforced concrete footing sized for the new firebox. The firebox itself is built with firebrick laid in refractory mortar, and we install a stainless steel flue liner from the smoke chamber to the termination cap. For Sunset Mesa and Riviera section homes exposed to ocean air, we spec 316-grade stainless liners rather than the standard 304 grade. Salt-laden moisture corrodes 304 stainless in as little as eight years along this stretch of the Westside. The 316 alloy holds up significantly longer in that environment.

Once the firebox is built and the liner is connected, we move to the finish work: stone or tile surround installation, mantel fitting, and hearth extension. Natural stacked stone and large-format porcelain slabs are the two most requested finishes in Brentwood right now. If the remodel includes gas conversion, the gas line and log set or burner are installed at this stage. We pressure-test the line and verify BTU output before the city inspector arrives. The entire conversion typically takes 10 to 14 working days. If you're weighing a full conversion against dropping in a modern fireplace insert to the existing chase, our fireplace inserts page compares the two approaches. For additional guidance on choosing cleaner-burning fireplace options, the EPA Burn Wise fireplace upgrade guidance is a useful resource.

Heritage Chimney Care handles every permit pull and inspection with the City of Los Angeles Department of Building and Safety. CSIA-certified technicians manage the project from first camera scan to final gas pressure test, so you have one point of contact from demo through the finished surround.