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Boral Home Additions & ADU: The Jacksonville Owner’s Guide
A Boral home addition or ADU in Jacksonville typically runs $45,000 to $130,000 for the completed project, depending on square footage, foundation work, and whether you’re adding a full kitchen or bath rough-in. Most owners call us when they’ve hit a wall: a contractor walked off mid-framing, the slab wasn’t poured to spec, or a previous addition is showing water intrusion at the roofline. We inspect the existing structure first, identify exactly what’s failing, and put a written price in your hand before any work starts.
What usually brings a homeowner to this page isn’t the whole addition. It’s one part of it: a tie-in detail at the roofline that leaks, a foundation seam that’s opened up, a truss connection that’s pulling loose, or an ADU that won’t pass a Jacksonville building inspection because the electrical rough-in was never done to code. The good news is these are fixable. The better news is much of it can be diagnosed in a single site visit, with a scope and a number attached.
Which Boral Models This Applies To
Boral’s building products line, particularly their siding, trim, and exterior cladding systems, shows up on countless Jacksonville home additions and ADU projects. When we’re called in to repair or complete an addition, we’re usually working with Boral TruExterior trim and siding products, which are engineered with a poly-ash formulation rather than wood fiber. That matters because the failure mode is different. TruExterior doesn’t rot the way wood composite does, but it can fail at the fastener line if it was installed with the wrong fasteners or without proper expansion gaps.
If you’re identifying Boral product on your existing addition, check the back of a trim board or an off-cut for the TruExterior stamp. The product line includes both smooth and wood-grain finishes, in sizes ranging from 1×4 to 1×12 trim boards, plus wider fascia and corner options. The compatibility gotcha with Boral TruExterior is the fastener schedule: it requires specific screw types and spacing, and if a previous contractor used standard nails or an air nailer with the wrong pressure, you’ll see fastener pops and wavy trim lines within two to three years in Jacksonville’s humidity. That’s the single most common Boral-specific failure we correct.
For ADU projects, Boral’s roofing tile and exterior cladding lines appear less frequently than James Hardie in the Jacksonville market, but we carry and install the full documented roster. On the OEM versus aftermarket question: for Boral TruExterior, we recommend OEM product because the poly-ash formulation isn’t matched reliably by aftermarket alternatives. For clip systems, flashing, and trim accessories, quality aftermarket equivalents from modern trim manufacturers are fine when they meet the same spec. We’ll tell you which is which on the estimate.
Styles & brands we work with
Signs Your Boral Home Addition & ADU Is Failing
- Fastener pops along Boral trim boards. This is the classic TruExterior install error. The material expands and contracts at a different rate than the framing behind it, and if the original installer didn’t follow the fastener schedule, you’ll see raised dimples and cracking at the nail heads along every trim line.
- Water staining at the roofline tie-in. The junction where an addition’s roof meets the original home’s roofline is the most common leak point in Jacksonville additions. It’s almost always a flashing detail done wrong, not the roofing material itself failing.
- Gaps at the exterior cladding seams. In Florida’s wet-dry cycles, poorly gapped Boral trim will open joints and expose the substrate. If you can see raw sheathing or housewrap at a seam, water is already getting in.
- An ADU that won’t sell or pass inspection. When a detached unit was built without a proper Jacksonville permits trail or with non-conforming electrical or plumbing rough-ins, owners only discover it at resale or refinance. We’ve untangled several of these along the Riverside corridor.
- Floors that slope or doors that stick. On pier-and-beam additions, this points to foundation settlement or a poorly compacted base. On slab additions, it often means the slab was poured without proper reinforcement or expansion control joints.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
For the Jacksonville market, a full home addition runs $45,000 to $130,000. An ADU construction project runs $90,000 to $220,000 depending on whether it’s attached or detached, the square footage, and whether it includes a full kitchen and bath. A garage conversion lands between $30,000 and $80,000. These are installed prices, not parts-only numbers, and they include permits, rough-in work, finish materials, and the final inspection.
What drives the range? Square footage is the biggest lever, followed by foundation type (slab versus pier-and-beam), whether a bathroom or kitchen is included, and the condition of the existing roofline tie-in. A simple room with no plumbing starts at the bottom of the range. A full ADU with a kitchen, bath, separate meter panel, and Boral exterior cladding throughout lands at the top. Every scope we write includes a line-item breakdown: materials, labor, permits, and the subcontractor schedule. No numbers move at the door.
All work is covered by our 365-Day Done Right Promise in writing. If your addition, ADU, or repair fails within the guarantee period, Bradford Remodeling Co Jacksonville returns and corrects it at no charge. That’s The Garrison Standard, and it’s the same framework every Garrison Partners location has operated under since 2004.
DIY or Call Us?
Some of this work is safe for a homeowner to inspect. You can walk the trim lines and look for fastener pops. You can check for water staining at the roofline tie-in after a heavy rain. You can see if doors are hanging crooked or if a seam has opened enough to expose sheathing. Document what you find. It helps us scope the job faster.
What you should not do is attempt structural or exterior envelope repairs yourself. The roofline tie-in on an addition involves removing and re-flashing at height, on a ladder, against the original home’s siding and roof system. Done wrong, it leaks worse than before. Same goes for foundation work and any electrical or gas rough-in inside an ADU. These are not weekend projects, and a failed DIY repair on a structural connection is more expensive to undo than the original repair would have been. If you’ve spotted the signs, call us at (904) 337-5929. We’ll come out, inspect what’s there, and give you a written scope and price.
FAQs
A correctly installed Boral TruExterior exterior on a properly framed addition should last 30 to 40 years in Jacksonville, with the main vulnerability being fastener-pop failures in the first two to three years if the install was sloppy. The framing behind it, the roof system, and the foundation should be engineered for a 50-year service life. Call (904) 337-5929 and we’ll tell you what you’re actually looking at on your specific addition.
Yes, in most cases. Fastener pops can be remediated at the individual board level, flashing at the roofline tie-in can be redone without touching the rest of the roof, and open seams can be properly gapped and sealed. Full replacement only makes sense when the substrate behind the cladding has rotted from prolonged water exposure. We’ll scope the minimum effective repair, not the maximum billable one.
A single-room addition with Boral exterior finishes typically runs 8 to 12 weeks from permit to final inspection. A full ADU with kitchen and bath runs 4 to 6 months. Weather, permit review times in Jacksonville, and supplier lead times on materials like Boral TruExterior all factor in. The scope we write before work begins includes the construction schedule so nobody’s surprised.
We stock and install Boral TruExterior trim and siding products alongside our documented material roster, which includes James Hardie exterior products, KraftMaid and Wellborn cabinetry, Cambria and Silestone surfaces, Kohler and Moen fixtures, and Therma-Tru doors. Bradford Remodeling Co Jacksonville is an independent service provider, not affiliated with Boral, but we’ve been specifying and installing their products on Jacksonville additions for years. Every material is documented in the written scope before work starts.
Written by Curtis Lane, Owner, Bradford Remodeling Co Jacksonville at Bradford Remodeling Co Jacksonville, serving Jacksonville and nearby areas.
