James Hardie Garage Conversion Contractor in Houston: What to Know First
We’re an independent James Hardie garage conversion contractor in Houston, and the short answer is this: converting a garage into living space typically costs $90,000 to $160,000 in our market, and most jobs take 10 to 16 weeks from first walkthrough to final inspection. That’s not a teaser number to get you on the phone. It’s the range we’ve seen hold true from the Heights out to Katy, and it’s what we write down before a contract is ever signed. If you own a home wrapped in James Hardie siding and you’re thinking about turning the garage into a bedroom, an apartment, or a full ADU (accessory dwelling unit, meaning a second livable structure on your existing lot), this page tells you what to expect from our crew.
Russ Delmar and the Lodgewick ADU Houston team have converted garages behind Hardie-sided homes across the Houston area for years now. Call (361) 326-2313 when you’re ready for a real number on paper.
How James Hardie Products Fail – and How We Fix Them on Garage Conversions
James Hardie fiber cement siding is tough stuff, but garage conversions put stress on it in ways a standard home addition doesn’t. Here are the failure modes we see most often on Houston garage conversions, and what we do about each one.
- HardiePlank lap siding pulling away at the garage-to-living transition. When a garage becomes living space, the wall assembly changes: insulation goes in, drywall goes up, and the moisture profile inside the wall shifts. HardiePlank lap siding installed over the original garage framing often wasn’t flashed for conditioned space. We see gaps open at the bottom course and around the old garage door opening after the door comes out and infill framing goes in. Our fix is to pull the affected courses, re-flash with proper Z-flashing at horizontal joints and head flashing at the new window or door openings, and re-secure per Hardie’s current fastener schedule: 6d galvanized or stainless nails, no closer than 3/8 inch from the edge.
- HardiePanel vertical siding buckling on west-facing garage walls. Houston sun is unkind to any dark-colored product, and HardiePanel sheets on unshaded west walls absorb a lot of heat. When the original install didn’t leave the required 1/8-inch gap at sheet edges and the required clearance at the roofline, the product can buckle in the afternoon heat. This is a known install error, not a product defect. We correct it by pulling and re-installing with proper gapping, and we always recommend a lighter ColorPlus finish or a heat-reflective paint if the homeowner wants to reduce future movement.
- HardieTrim boards rotting at grade contact on older garages. James Hardie requires a 6-inch clearance between HardieTrim and finished grade. On Houston slabs, soil and mulch creep up over time. By the time a garage conversion starts, the bottom of the trim boards may be wicking moisture. We cut back the HardieTrim, install a proper vinyl or aluminum bed molding at the transition, and paint the exposed cut edge, which keeps the product warranty intact and stops the rot line from climbing.
- HardieSoffit panels showing nail pops and sagging after the garage door header gets reworked. When we reframe the garage door opening into a wall with a window or French door, the header above it changes and the soffit above that header has to be re-fastened. Original soffit installs on older Houston garages often used staples or undersized fasteners. We re-fasten the HardieSoffit with corrosion-resistant screws per manufacturer spec, which also quiets the panel rattle common on windy spring days.
- ColorPlus finish fading unevenly around the old garage door footprint. The infill wall we build where the garage door used to be gets new Hardie siding to match, but a color match between a 15-year-old ColorPlus finish and a fresh factory finish is never exact. We’re straight about this up front: a repaint of the affected elevation is usually the right call, and we include that in the written price rather than surprising you after the wall is built.
Our James Hardie Garage Conversion Contractor Process
Every job follows the same order of operations, and we hand you a written schedule before the first nail gets driven.
- 1
Walkthrough and measurements. We come to your house, look at the garage as it sits, and talk about what you need the space to do. Russ is known for being straight about cost on this first visit.
- 2
Plans and written price. We put together a scope of work with line-item pricing, including every Hardie product we’ll match, patch, or replace. You get this in writing. It’s the same price at the end as it was on day one.
- 3
Permit application. Houston requires permits for garage conversions, and we pull them. No exceptions, no asking you to do it.
- 4
Demolition and reframing. The garage door comes out, the infill wall goes in, and we address every Hardie failure point identified in the walkthrough: flashing, gapping, fasteners, trim clearance.
- 5
Mechanical, insulation, drywall, and finish. Plumbing, electrical, and HVAC run through the new walls. We insulate to current Houston energy code. Then drywall, flooring, paint, and trim.
- 6
Final inspection and the written guarantee. We walk the job with you, note anything that needs attention, and don’t call it done until you agree it’s done. Then you get the 365-Day Done Right Promise in writing: if it’s not right within a year, we come back and make it right, free.
What James Hardie Garage Conversion Contractor Costs in Houston
Here’s the real math on garage conversions in Houston, based on what we’ve written on actual quotes:
| Project Type | Typical Cost Range | What Drives the Price |
|---|---|---|
| Attached garage to bedroom (one room) | $90,000 to $120,000 | Bathroom or not, window size, HVAC tie-in distance |
| Detached garage to full ADU with kitchen | $130,000 to $160,000 | Foundation condition, utility trenching, Hardie siding match scope |
| Garage apartment conversion (rental-ready) | $120,000 to $155,000 | Separate entrance, meter separation, sound isolation |
| Extensive Hardie siding repair as part of conversion | $8,000 to $25,000 | How many elevations, trim replacement, repaint scope |
The numbers above are for the full conversion, not just the Hardie work. Siding repair is typically a smaller line item inside the bigger project. What moves the price most is the condition of the existing Hardie product and whether the garage slab needs leveling or drainage work before framing begins. Call (361) 326-2313 and we’ll give you a written line-item quote instead of a guess.
Why Houston Homeowners Call Lodgewick ADU Houston for James Hardie Work
We’re the ADU company of the Kingswell family, operating under The Kingswell Guarantee. That means a written price before work begins, a defined arrival window on every work day, a clean job site every evening, and a written guarantee on every project. The 365-Day Done Right Promise is named on paper and delivered before we start, not after we’re paid. Our technicians are background-checked and uniformed, so the person in your driveway is someone we’d vouch for by name. And when you call, a live person answers. Twenty-four seven. Not a voicemail inbox that goes dark over a holiday weekend. We also work with other established ADU brands (Abodu, Cover, Dvele), so if your project pairs better with a prefab system than a stick-framed conversion, we’ll tell you that on the first visit.
One more thing: a lodge is a small house on a larger property. That’s exactly what an ADU is. It’s the whole reason our name fits this work.
FAQs
No, converting your garage to living space will not void the James Hardie product warranty on the siding itself, as long as the siding work is done to manufacturer installation specs. We keep our fasteners, flashing, gapping, and clearance details aligned with the current James Hardie installation guide so the product warranty stays intact. Where original siding was installed incorrectly and we correct it during the conversion, the manufacturer warranty on the replaced sections starts fresh. Call (361) 326-2313 and we’ll walk through what your walls need.
We can get close with factory ColorPlus product in the same color name, but an exact match between old and new is not realistic. UV exposure fades the factory finish over Houston summers, and a panel that’s been on the wall for a decade will not match a fresh one. We’re up front about this: the honest fix is usually a repaint of the affected wall or elevation, and we price that into the written quote from day one. If you want the final word on color, call us and we’ll bring sample boards to your driveway.
Most full garage conversions take 10 to 16 weeks from permit application to final inspection. Demolition and reframing usually take a week, mechanicals another two, and the finish work consumes most of the remaining time. Permitting through the City of Houston adds two to four weeks depending on plan review backlog. We put the schedule in writing, and Russ Delmar’s reputation rests on finishing on the date he wrote down at the start.
We do the Hardie work ourselves, within the conversion contract. We don’t sub out the siding repair to a third party and we don’t ask you to hire a separate siding crew. Any Hardie damage, improper original installation, or trim clearance issue we find during the walkthrough goes into the written scope and is fixed by our own technicians before the new insulated walls go in. That keeps the building envelope, the weather barrier, and the aesthetic in one accountable line of work.
Usually, yes, because the crew is already on site, the dumpster is already in the driveway, and the scaffolding or ladder setup only happens once. You’ll also avoid the cost of pulling permits twice. If your siding needs work and you’re already committed to a conversion, it’s the most cost-effective time to do both. Call (361) 326-2313 for an exact figure on your specific walls.
Written by Russ Delmar, Owner, Lodgewick ADU Houston at Lodgewick ADU Houston, serving Houston and nearby areas.
