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IKO Home Additions & ADU: The Tampa Owner’s Guide
If you’re planning an IKO home addition or ADU in Tampa, the installed cost typically runs $45,000 to $130,000 for an addition, and $90,000 to $220,000 for a detached ADU, depending on foundation work, square footage, and finishes. We match IKO roofing and underlayment systems to the framing and tie-in details, so your new space keeps the same thermal and moisture protection as the original house. Most Tampa owners come to us after noticing their current IKO shingles flashing or lifting at the roofline, or when they realize the addition they want needs a roof pitch and overhang that won’t collect standing water during a summer afternoon storm.
We write it down before we start so nobody is guessing mid-project.
Which IKO Models This Applies To
IKO makes a full family of asphalt shingle lines: Marathon, Cambridge, Dynasty, Crowne Slate, and Nordic, along with their Armourbase underlayment and StormShield ice-and-water barrier. For a Tampa home addition or ADU, the roof system usually matters less by shingle name and more by the underlayment spec: IKO StormShield is the product we want when tying a new roof plane into an existing one, because Tampa’s afternoon downpours find any seam in a poorly flashed valley. A compatibility gotcha: IKO Cambridge and Dynasty shingles use different exposure widths (5-5/8″ vs 5-7/8″), so if your existing roof is Cambridge, you can’t mix in Dynasty on the new section without visible stagger lines. The part number on IKO’s product bundle wrappers tells you the exact color blend and lot; photograph the bundle label before discarding, because sun-bleaching over two or three Tampa summers shifts the roof color enough that a mismatched bundle is obvious from the street.
OEM vs aftermarket: with IKO, we use IKO shingles and IKO underlayment when matching an existing roof. Aftermarket ridge cap or flashing that looks close but isn’t IKO will weather differently in Florida humidity and void the IKO limited-warranty on the adjacent roof. We’re an independent remodeling contractor, not affiliated with IKO, but we specify their products on additions because the homeowner can look up the warranty by bundle code. For interior finishes inside the addition or ADU, we stock KraftMaid and Wellborn cabinets and Cambria or Silestone countertops, so the material warranties travel with the finished space.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Granule loss collecting in gutters or at the base of downspouts after a rain. In Florida heat, asphalt shingles shed granules as the binder oxidizes; if your addition’s gutters look like black sand in the runoff, the shingle surface is wearing past the point where sealing a leak is enough.
- Lifting or flapping shingle tabs along the eave or rake edges of the new roofline. Tampa’s afternoon storms load the eaves with water and wind, and under-driven nails or degraded adhesive strips on IKO shingles will show lifting there first, usually within 5 to 8 years of install.
- Dark streaks or damp spots on the underside of the roof deck in the new addition’s attic. That’s water coming through the deck, not surface mildew; by the time the ceiling shows a stain, the IKO underlayment at a valley or wall tie-in has been compromised for months.
- Popped, corroded, or hazy flashing at the point where the addition roof meets the original house wall. That junction is the number-one failure point on Tampa additions. Step flashing that was nailed improperly or caulked instead of overlapped lets wind-driven rain climb the wall plane and sit against the sheathing.
- Soft spots or “spongy” areas in the new space’s ceiling drywall after a normal rain event. This tells us the IKO StormShield ice-and-water barrier was either skipped on the eaves or lapped the wrong direction, and moisture has reached the structural deck.
See the difference
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After
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AfterReplacement Cost & What’s Included
A new build home addition in Tampa runs $45,000 to $130,000, and an ADU construction project runs $90,000 to $220,000. Where your project lands inside that range depends on whether we’re doing a ground-up slab, how long the roof tie-in is, whether the addition has plumbing (a bath or kitchenette pushes it toward the top), and the finish level you want on cabinets, counters, and flooring. For a failing IKO roof on an existing addition, a targeted repair runs roughly $600 to $2,500 in materials and labor, and a full roof replacement on a smaller addition runs $8,000 to $20,000 depending on square footage and tear-off.
Every price we give in Tampa is written before any work starts, and it stays written. That means the shingles, underlayment, flashing, dumpsters, labor, and the clean-up photo are all in the number. If we find rot in the decking once we open the roof, we price the repair line-item and get your sign-off before cutting. Our 365-Day Done Right Promise covers the work after completion, including the roof tie-in, flashing, and interior finish work on the addition itself.
DIY or Call Us?
Replacing a couple of IKO shingles on a low, hip-roofed addition is something a careful homeowner can do, if they seal the nails and follow the bundle’s wind-nailing pattern. What you should not DIY is any roof work above 6/12 pitch, any valley or wall-tie flashing, or any underlayment work, because those are the details that keep Tampa’s August rain out of your new space, and a misaligned lap or a caulked step flashing fails silently inside a wall cavity. Same with running new roof trusses across the existing house’s load path: that’s engineering territory, and Tampa’s wind zone makes the connection details not optional.
If your addition is leaking, or the roofline is lifting, call us at (850) 779-4017. Graham Stein and the crew will look at it, write the price, and leave your house with the floors covered, the shingles matched, and a photo of the clean-up before we go.
FAQs
On a properly ventilated Tampa addition, IKO architectural shingles (Cambridge, Dynasty) typically give 15 to 20 years of weather performance before granule loss and sealant aging start showing at the eaves. That’s shorter than northern roofs because Florida’s UV load and heat-cycling age the asphalt binder faster. A roof with IKO StormShield at the eaves and all valleys, properly step-flashed at the wall tie-in, should stay leak-free for that same span. Call (850) 779-4017 if you’re seeing early granule loss on a younger addition; that can be a ventilation or underlayment issue, not the shingle.
Small, localized failures like a damaged valley flashing or a handful of blown-off tabs can usually be repaired for $600 to $2,500. If granule loss is roof-wide, or the decking is soft and the underlayment has been penetrated in multiple spots, a full re-roof on the addition is the honest answer. We’ll write down what we see and give you a pain number before any tear-off happens. Estimates are free; call (850) 779-4017.
For an addition of 300 to 600 square feet, the shell, roof, and tie-in typically take 8 to 14 weeks once permits are in hand; a full ADU with utilities and finishes runs 4 to 8 months depending on scope and inspections. The roof and flashing work on an addition, including the IKO shingle and underlayment install, is usually done within the first two weeks of the framing phase. We schedule noisy work during daytime hours and keep quiet tools for the nap-window tasks when we can. Call (850) 779-4017 for a written schedule with your estimate.
We stock IKO StormShield ice-and-water barrier, IKO starter strips, and a working supply of IKO Cambridge and Dynasty shingles in the most common Tampa color blends on the truck, along with matching flashing profiles. For larger additions or a full ADU, we order exact-bundle matches by lot code from our Tampa supplier before the tear-off day so your new roof plane matches the existing one. Call (850) 779-4017 and we’ll confirm what we can bring the same week.
We serve Tampa and nearby areas. If you’ve got an IKO addition and adu that’s not holding up, or you want one quoted right, call (850) 779-4017 for a free estimate. We answer the phone.
Written by Graham Stein, Owner, Elmstead Remodeling Tampa at Elmstead Remodeling Tampa, serving Tampa and nearby areas.
