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IKO Home Additions & ADU: The Fort Lauderdale Owner’s Guide
A full IKO home addition or ADU in Fort Lauderdale typically runs $45,000 to $130,000 installed, with most of that range driven by the size of the new footprint, whether you’re tying into existing roof lines, and how much site prep your lot needs for Florida wind code. We stock the framing, sheathing, and weatherproofing components that make an addition or ADU stand up to coastal humidity and hurricane season, and we’ll match your existing IKO roof system so the new structure doesn’t look bolted on.
Most owners don’t wake up one morning and discover their addition failed. They notice it slowly: a roof valley where two IKO shingle lines meet starts holding water after a storm, a wall that never quite dried out after the wet season, or a floor that started feeling soft near the exterior door. By the time you see it, the fix usually means opening something up, not just patching over it.
Key Takeaways:
- Typical home addition and ADU work in Fort Lauderdale: $45,000 – $130,000
- We match IKO roof systems so new construction blends with your existing home
- Written price before any work starts, backed by the 365-Day Done Right Promise
- Call (754) 354-7423 for a free estimate from Luca Romano and our Fort Lauderdale crew
Which IKO Models This Applies To
IKO manufactures a wide range of asphalt shingles, underlayments, and waterproofing products, and the compatibility question is really about which IKO line your existing roof uses. If your home has IKO Cambridge, Dynasty, or Nordic shingles, the new addition roof should use the same architectural profile and color family, or the roofline will read as a patch job from the street. If you’re on an older IKO Marathon or a three-tab line, we’ll walk you through whether to match, upgrade, or re-roof the entire home at once so you don’t carry two aging roof systems.
The gotcha most Fort Lauderdale homeowners don’t see coming: IKO shingles have a specific exposure width and nail line, and the waterproofing underlayment beneath them matters more in this climate than the shingle itself. A dry, code-minimum install works up north. Here, we use a peel-and-stick underlayment across the entire new deck, not just the eaves, because a tropical storm will push water sideways. Sawyer Remodel Fort Lauderdale is an independent remodeling company, not an IKO dealer, which means we recommend what actually holds up in South Florida rather than pushing a single product line.
If you can’t find the IKO model name on the shingle packaging or a leftover bundle in the garage, take a photo of the shingle edge profile and we can usually identify it from that.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Staining on the ceiling where the new roof ties into the old one. This is the number one failure point on additions, because the valley or transition flashing wasn’t layered correctly. Water travels along the seam and shows up yards from the actual leak source.
- Soft spots in the floor near any exterior door on the addition. This usually means the threshold or sill flashing is failing and water is wicking into the subfloor every time it rains hard. In Fort Lauderdale, that’s roughly every afternoon from June to September.
- Mold smell in a closet or corner of the addition that won’t go away. That’s trapped moisture behind drywall, almost always from a flashing detail or a vapor barrier that was skipped. It won’t dry out on its own in 80% humidity.
- Windows or doors on the addition are hard to open or no longer square. South Florida soil shifts, especially in older neighborhoods near Las Olas Boulevard where fill dirt settles unevenly. A binding door can signal foundation movement under the new structure.
- Granules from the addition roof collecting in the gutters. Some granule loss is normal in year one. Heavy loss after a few years means the shingles got cooked by the sun and are losing their protective surface faster than they should.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a home addition in Fort Lauderdale, you’re looking at $45,000 to $130,000 depending on square footage, whether you’re adding a bathroom or kitchen (those bump the number fast), and what the site requires. An ADU with its own kitchen and bath runs higher, typically $90,000 to $220,000 when permitted and built as a separate living space. A garage conversion lands between $30,000 and $80,000. Here’s the line-item reality:
- Site prep and foundation: $8,000 – $25,000 depending on fill, compaction, and whether we’re pouring a slab or setting piers
- Framing and structural tie-in: $15,000 – $40,000 for the new footprint, roof structure, and connection to the existing home
- Roofing with IKO-compatible materials: $8,000 – $20,000 including underlayment, flashing, and shingles matched to your existing line
- Exterior, windows, and weatherproofing: $10,000 – $30,000 for impact-rated windows, siding, and the moisture barrier details that keep a South Florida addition dry
- Finishes, electrical, and plumbing: $4,000 – $15,000 depending on scope
Every estimate from us includes a written price before work starts, and that’s the number on the final invoice. The 365-Day Done Right Promise covers the work for a full year after the project closes. If something’s not right, we fix it. No argument.
DIY or Call Us?
If you’re just trying to figure out whether you have a problem, you can safely do two things: check the ceiling and wall corners of your addition for staining after a hard rain, and inspect the exterior for gaps where the new roofline meets the old one. That’s a flashlight task, not a ladder task.
Beyond that, this is structural and waterproofing work, and most of it happens on a roof or under load-bearing framing. A botched flashing detail on an addition doesn’t fail politely. It fails during the next named storm, when the water finds the seam and soaks your drywall, insulation, and subfloor in one night. We’ve opened up enough Fort Lauderdale additions to know the difference between a leak you can see and one that’s been silently rotting a wall for three years. If you’re not sure what you’re looking at, call (754) 354-7423 and Luca Romano will tell you straight whether it’s worth a service visit or something you can watch. The estimate is free either way.
FAQs
The structure itself should last 50 years or more if the waterproofing details are done right, but the roofing materials on a Fort Lauderdale addition typically need replacement every 15 – 20 years because the sun and salt air beat on them harder than in most of the country. The frame isn’t the weak point. The seams are. Call (754) 354-7423 if you want an honest read on your specific addition’s condition.
Yes, in most cases the fix is targeted: re-flash a roof transition, open a wall to replace rotted sheathing, or re-level a settled section of framing. Full rebuilds are rare unless the failure was ignored for years. We’ll open it up enough to show you exactly what we found before any repair price gets quoted.
A typical home addition in Fort Lauderdale runs 3 to 6 months from permit approval to final inspection, depending on scope and weather. An ADU with full plumbing and electrical is usually 4 to 8 months. We give you a written schedule with milestones, and you get photo updates before and after each phase. No four-hour waiting windows, no ghosting.
We supply everything through our material partners, including IKO-compatible roofing and the framing and sheathing materials that meet Florida wind code. You don’t need to order anything yourself, and you’ll see the material line items in your written estimate before work starts. If you’re also planning interior work, we carry options from KraftMaid, Cambria, and Silestone for cabinetry and countertops.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Fort Lauderdale at Sawyer Remodel Fort Lauderdale, serving Fort Lauderdale and nearby areas.
