Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Boral Home Additions & ADU: The Orlando Owner’s Guide
If you’re planning a Boral home addition or ADU in Orlando, the installed price typically runs $45,000 to $130,000 for a home addition and $90,000 to $220,000 for a detached ADU, depending on square footage, foundation work, and finishes. We stock and install Boral-compatible materials for these projects, and our crew handles everything from slab pour to final trim. Most owners don’t realize their existing exterior siding or trim from Boral has a compatibility issue until they start planning the addition and discover mismatched profiles or discontinued lines.
That’s the moment to stop guessing. Boral products have specific series and profile numbers that don’t always play nice across generations, and getting the wrong match means visible seams, uneven shadow lines, or water intrusion at the transition. We sort that out before the first wall goes up.
Which Boral Models This Applies To
Boral’s exterior product lines include trim boards, fascia, siding profiles, and decorative mouldings across several series, including the TruExterior and Foundation lines. The compatibility gotcha most Orlando homeowners hit is this: Boral changed profile dimensions on select trim boards around 2018, so a 1×6 from 2016 won’t sit flush against a 1×6 bought today without a visible step. If you’re tying a new addition into existing Boral trim, you need to measure the actual thickness, not just the nominal size. It’s usually 5/8″ or 3/4″, and that 1/8″ difference is what causes the seam to catch your eye every time you walk past it.
For siding, check the back of an existing board for the profile code. Boral’s shiplap and lap profiles have distinct reveal dimensions, and mixing a 6″ reveal with a 7″ reveal looks wrong even if both are painted the same color. We also carry aftermarket equivalents from KraftMaid, Cambria, and Silestone for interior surfaces where Boral exterior products don’t apply, but for exterior continuity, OEM Boral is usually the right call on additions that tie into existing trim.
One more thing: if you’re building an ADU in Orlando, city code requires specific wind-load ratings on exterior cladding for structures in the High Velocity Hurricane Zone. Boral products meet those ratings when installed to spec, but we’ve seen plenty of unpermitted ADUs where the siding wasn’t rated and the homeowner found out at the resale inspection. That’s a $15,000 re-siding job that could have been avoided.
Styles & brands we work with
Signs Your Boral Home Additions & ADU Is Failing
- Visible seam separation where the addition meets the original structure. This usually means the original Boral trim was installed with a different fastener schedule than the new work, or the profiles don’t actually match. The gap opens up in Orlando’s hot, humid summers when materials expand.
- Paint peeling at the transition line only. Moisture is wicking behind mismatched Boral boards. The factory edge on one side is sealed and the other isn’t, so water gets in where the two meet. We see this constantly on additions built by crews who didn’t prime cut edges.
- Soft spots or bubbling on trim boards. Boral products resist rot better than wood, but they’re not indestructible. Improperly flashed window or door openings let water sit against the back of the board, and Orlando’s rainy season turns that into a slow failure.
- Fascia pulling away from the roofline at the corners. This is a fastener issue, not a Boral product issue. The original installer likely used fasteners that were too short for the material’s weight. Boral boards are heavier than wood, and short nails back out over time.
- Cracking at miter joints on outside corners. Boral expands and contracts at a different rate than the framing behind it. If the installer didn’t leave the proper gap at miters, the corners open up within two or three Orlando summers.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For a Boral home addition or ADU in Orlando, you’re looking at $45,000 to $130,000 for the full project. That range covers plans, permits, foundation, framing, Boral exterior materials, and interior finishes. A smaller bump-out or attached suite lands at the lower end. A full ADU with kitchen and bathroom pushes toward the top or beyond, into the $90,000 to $220,000 range depending on square footage and site prep.
Here’s how the numbers break down:
- Boral exterior materials (siding, trim, fascia): $12,000 – $35,000 depending on square footage and profile selection
- Foundation and site work: $8,000 – $25,000
- Framing, roofing, and structural: $15,000 – $40,000
- Interior finishes (drywall, flooring, paint): $10,000 – $30,000
Every quote we write follows The Relay Standard: a written price before any work starts, so the number you approve is the number you pay. No change orders unless you change the scope. The 365-Day Done Right Promise covers the workmanship for a full year after close out, in writing.
DIY or Call Us?
If you’re replacing a single Boral trim board or touching up caulk at a seam, a careful homeowner can handle that with basic tools. Measure the board thickness first, buy the matching profile, and prime every cut edge before installation. That’s the difference between a repair that lasts and one that rots in two years.
But when you’re planning an addition or ADU, this is not a weekend project. You’re pulling permits, setting foundations, and tying structural loads into an existing roofline. Get the flashing wrong and you’ve got water running into your walls for years before you see the damage. Get the wind-load rating wrong and a hurricane season makes you regret every shortcut. Luca Romano has spent nearly two decades on Central Florida job sites, and the most expensive projects we take over are the ones where someone tried to save money on the front end. Call (850) 809-0306 and let’s talk before you buy materials.
FAQs
Boral exterior products last 30 to 50 years when installed to spec in Orlando, but the realistic lifespan for the structure itself depends on installation quality. The weak points are transition flashing and cut-edge sealing, not the Boral material itself. We routinely see Boral trim from 15 years ago that still looks new, sitting right next to a 5-year-old addition that’s failing because someone skipped primer. Call (850) 809-0306 and we’ll tell you what you’re actually working with.
Yes, if the failure is caught early. Seam separation, cracked miters, and minor water staining can usually be repaired with new flashing, proper fasteners, and sealed joints. If the underlying framing has rotted from years of water intrusion, you’re replacing structure, not just trim. We’ll tell you which category you’re in before we quote anything.
A typical home addition runs 3 to 6 months in Orlando from permit to final inspection. An ADU runs 6 to 12 months depending on complexity. Permitting with the City of Orlando adds 4 to 8 weeks on its own, and that’s before we break ground. We give you a schedule in writing and photo updates before and after each phase, so you’re never guessing where the job stands.
We stock common Boral trim profiles and siding profiles for Orlando projects, and we order specialty profiles direct from Boral suppliers with a 1 to 2 week lead time. If you’re matching existing Boral from an older home, we’ll verify the profile before we order so you don’t end up with a mismatched seam. Estimates are free, and the written price includes all materials.
Call (850) 809-0306 to schedule your free estimate. We’ll walk the site, measure what’s there, and give you a written price so you know exactly where you stand before you spend a dime.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Orlando at Sawyer Remodel Orlando, serving Orlando and nearby areas.
