James Hardie Garage Conversion Contractor in Los Angeles: What to Know First
We convert garages sided with James Hardie fiber cement into permitted living space across Los Angeles, and most projects run $145,000 to $220,000 depending on whether you’re converting an attached two-car garage or building up over a detached one. We are an independent James Hardie service provider, not a factory-authorized installer, which means we call out what the siding needs before we touch the framing. If you own a James Hardie-sided garage and want to know whether it can become a legal bedroom, ADU, or rental unit, call (213) 698-7116 and we’ll give you a straight answer. Russ Delmar has been doing this work in Los Angeles for fifteen years, and we put every price in writing before we start.
How James Hardie Products Fail – and How We Fix Them
James Hardie siding is tough, but a garage conversion pushes it into a new job description. Here are the failure modes we see in Los Angeles specifically.
- HardiePlank lap siding pulling away at the bottom course. Garages in Los Angeles get hosed down, cars drip, and sprinklers overspray onto the lap line. The bottom course wicks moisture, swells, and the nails start to back out. On a conversion, that bottom course is coming off anyway when we cut in the new stem wall or floor assembly, so we inspect the sheathing behind it before it’s hidden by new framing.
- HardiePanel vertical siding with cracked field joints over the slab. Detached garages in neighborhoods like West Adams and Van Nuys move with the expansive soil. When the slab heaves, the panel joints crack at the fastener line. We pull the panels, check the shear wall, and re-sheath with new panels before the interior insulation goes in. Catching this before drywall saves a mid-project tear-out.
- HardieSoffit trapped moisture above an unvented garage ceiling. A garage never heated or cooled has wild temperature swings. Soffit boards that never dried got soft around the edges. When we open the ceiling for the conversion, we find the soft spots and replace them with vented HardieSoffit or a vinyl alternative if the homeowner wants lower maintenance on the new roofline.
- HardieTrim boards around the overhead door opening. The trim around the roll-up door takes sun on the south face and water splash at the bottom. Trim that rotted or delaminated at the bottom corner of the door is a sign of flashing failure. On a conversion, the wall is infilled and the trim removed, and we make sure the new infill flashing laps correctly over the sill plate so water stays outside the new bedroom.
- ColorPlus finish fading on the west-facing wall. The factory-applied ColorPlus finish on James Hardie siding fades faster on west-facing walls in Los Angeles heat. When we’re adding a second story above an existing garage, the new upper walls get new Hardie siding, and the remaining lower siding often doesn’t match. We’ll talk through whether the tolerance for a slight color shift works for you, or whether the lower wall gets repainted to blend.
Our James Hardie Garage Conversion Contractor Process
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Call and site visit. You call (213) 698-7116, a live person answers, and we schedule a time to walk the garage with you. We check the existing James Hardie siding condition, the slab, the roofline, and the panel capacity before we say what the conversion will take.
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Written scope and price. Before any work starts, you get a written line-item price. The Kingswell Guarantee means that number doesn’t change at the door, period.
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Permits and Plans. We pull the Los Angeles Department of Building and Safety permits for the ADU or garage conversion. Russ learned early at Los Angeles Trade-Technical College that a permit pulled correctly the first time saves months of grief.
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Siding assessment and salvage. We evaluate which James Hardie siding can stay and which must come off to meet energy code, shear wall requirements, or elevation changes. If you have HardiePlank lap siding that matches the house, we may recommend keeping the existing siding on lower walls where allowed.
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Conversion and tie-in. Framing, insulation, drywall, electrical, plumbing, and the roof tie-in get done in sequence. The crew shows up in the window we gave you, keeps the site clean, and wears uniforms so you know who’s on your property.
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Final inspection and the guarantee. We walk the finished space with you, confirm the work is done right, and hand you the written guarantee. If anything fails within the 365-Day Done Right Promise period, we come back and make it right, free of charge.
What James Hardie Garage Conversion Contractor Costs in Los Angeles
Here are honest ranges for the most common James Hardie-to-living-space conversions we price in Los Angeles.
- Attached garage conversion to bedroom or home office (no plumbing): $95,000 to $150,000
- Attached garage conversion to full ADU with kitchen and bath: $165,000 to $225,000
- Detached garage conversion to ADU (new foundation work, existing Hardie siding reused where possible): $190,000 to $260,000
- Second-story addition above existing garage (new Hardie siding on upper walls, roof tie-in, structural upgrade below): $280,000 to $380,000
What moves the price: whether the existing James Hardie siding can stay or must be replaced, whether the garage slab has adequate footings for the new use, whether you need a full kitchen and bath versus a simple sleeping room, and whether Los Angeles zoning requires a solar panel allocation on the new ADU. You’ll get a written line-item price before any work begins. Call (213) 698-7116 for your free estimate.
Why Los Angeles Homeowners Call Lodgewick ADU Los Angeles for James Hardie Work
Most of the people we work with have been through a bad contractor story before they call us. They had a price change at the door, or a crew that never showed, or a repair that failed a month later. That’s why we put everything in writing. The Kingswell Guarantee covers four things: a written price before work begins, a defined arrival window, a clean job site, and a written guarantee on every project. If the work fails within the guarantee period, we return free of charge. Our crews know James Hardie fiber cement, but they also know Abodu, Cover, and Dvele prefab systems, so if a panelized garage or prefab ADU makes more sense for your lot, we’ll match the right system to your budget. We answer calls 24/7 with a live person, not a voicemail loop. Russ Delmar grew up in Palms, a few blocks from the old Helms Bakery building, and he still knows most of his neighbors by name. Tell him what you need the space to do, and he’ll tell you exactly what it’s going to take, no guessing, no runaround.
FAQs
Yes, in most cases a detached or attached garage can be converted into a legal accessory dwelling unit, which is a separate living space with its own entrance, kitchen, and bath, as long as the lot is zoned to allow it and the existing slab and framing meet structural requirements. The James Hardie siding on the garage rarely blocks the conversion, but we do inspect it for water damage and shear wall capacity before we finalize plans. Call (213) 698-7116 for a free on-site assessment.
Sometimes the existing siding can stay on lower walls if it’s sound and the conversion doesn’t require opening those walls, but sections at the door opening, any water-damaged bottom course, and areas where new windows or doors get cut in will be removed and replaced or re-flashed. We reuse what we can, replace what we must, and the written line-item price tells you exactly what’s happening before we start.
The James Hardie product warranty covers manufacturing defects in the siding, not modifications to the structure it’s attached to, so the conversion itself doesn’t void the warranty on the existing siding. However, any cuts, penetrations, or reinstallation of the siding done during the conversion are on us, and we install new materials per James Hardie installation specs. If you want the siding warranty documentation reviewed, call (213) 698-7116 and we’ll walk you through it before the project starts.
Most garage conversions take four to seven months from permit submittal to final inspection, depending on whether you’re converting an attached garage into a bedroom or a detached garage into a full ADU with plumbing and a kitchen. The Los Angeles Department of Building and Safety plan check alone can run four to eight weeks. We give you a defined schedule at the start and update it as each inspection clears.
Yes, we pull all required building, electrical, plumbing, and mechanical permits with the Los Angeles Department of Building and Safety, and we schedule every inspection. A permit pulled correctly the first time is the difference between a three-month project and a two-year headache, so we handle the paperwork and you get the final sign-off in writing. Call (213) 698-7116 to talk through your garage.
Contact Lodgewick ADU Los Angeles at (213) 698-7116 to schedule your free estimate for a James Hardie garage conversion. A live person answers, every time.
Written by Russ Delmar, Owner, Lodgewick ADU Los Angeles at Lodgewick ADU Los Angeles, serving Los Angeles and nearby areas.
