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IKO Home Additions & ADU: The Tampa Owner’s Guide
Home additions and ADUs in Tampa typically run $45,000 – $130,000 for a permitted, code-compliant project, with ADU construction starting around $90,000 when it’s a detached structure with its own utility connections. When a homeowner calls us about an IKO-related addition, it’s usually because the roof underlayment or decking on an existing IKO roof is failing, or water is finding its way into the framing where an addition ties into the main house. The problem shows up as a ceiling stain near the tie-in, a musty smell in a closet against the new wall, or shingle granule loss on the section of roof over the addition. A live person answers at (941) 655-9297, 24/7, and we’ll give you a straight read on what’s happening before anyone schedules a site visit.
Bradford Remodeling Co Tampa is an independent contractor, not an IKO dealer or affiliate. We work with IKO roofing products on additions because the specs are consistent and the manufacturer documentation is clear, but the warranty on our work is ours, in writing, and it’s called the 365-Day Done Right Promise.
Which IKO Models This Applies To
IKO’s product line relevant to home additions and ADUs in Tampa falls into two broad groups: the asphalt shingle lines (Cambridge, Dynasty, Nordic, Marathon) and the underlayment and barrier products (StormShield, GoldShield, ArmourGard) that go under them. The compatibility gotcha on an addition is this: an addition roof that ties into an existing IKO-shingled roof has to match the shingle profile closely enough that the tie-in flashing can lap correctly, or you get a seam that leaks at the first wind-driven rain.
Here’s the practical version. If your existing roof was installed with IKO Cambridge architectural shingles, the addition roof should use Cambridge or a profile with the same exposure, not a three-tab shingle or a different architectural profile with a thicker butt. A roofer who slaps any shingle on the new roof and calls it a match is creating a hump at the tie-in. We measure the existing exposure and match it. The OEM versus aftermarket question doesn’t really apply to shingles the way it does to appliance parts, but it does apply to the ridge cap and ventilation. We stock IKO Hip & Ridge cap shingles on the truck for this exact reason, because generics crack faster under Florida sun.
For the decking and underlayment under an addition roof, the IKO spec that matters most in Tampa is a self-adhered or mechanically fastened underlayment rated for high-wind and secondary water protection. The uplift rating on IKO StormShield matters when the inspector asks for the Miami-Dade or Florida Building Code documentation. We include the spec sheet in the close-out packet on every addition, so you’re not digging for it when you sell the house.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Granule loss on the addition roof but not the main roof. This usually means the addition roof was done with a mismatched shingle or an underlayment that traps heat against the decking. Tampa’s heat index cooks the binders in the asphalt and the granules let go early. We see this on additions where the original roofer used a lighter shingle than the main house and the sheathing was never ventilated properly.
- Staining at the ceiling where the addition wall meets the original exterior wall. That’s the tie-in flashing failing or never being installed correctly. Water runs down the original wall, finds the seam, and follows it inside. It shows as a brown line that follows a straight edge, not a random stain.
- Musty smell in the closet or bedroom closest to the addition’s exterior wall. This means water is getting behind the siding or stucco at the head wall flashing and soaking the insulation. By the time you smell it, the framing has been wet for weeks. In Tampa’s humidity, that’s enough for mold to take hold in the wall cavity.
- Shingles lifting on the addition roof within two years. Florida wind uplifts shingles that were nailed too high or nailed with the wrong fastener pattern. IKO publishes a nailing schedule for every shingle line. A shingle that lifts along the nail line was installed outside the spec, and that’s a workmanship issue, not a product defect.
- Attic temperature in the addition is noticeably hotter than the main house. Poor intake and exhaust ventilation on an addition roof roasts the shingles from below and shortens their life dramatically. We’ve measured 140°F-plus attics in Tampa additions where the original roofer put ridge vent on but no soffit intake, which means the ridge vent is doing nothing.
See the difference
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After
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AfterReplacement Cost & What’s Included
When a home addition or ADU roof section has to be re-done, the price depends on whether we’re stripping and re-shingling the addition roof alone, re-decking it, or fixing the tie-in where it meets the main house. In Tampa, a re-shingle of a typical 300 – 500-square-foot addition roof runs $4,500 – $8,500. If the decking has rotted from the leak we described above, add $1,200 – $3,000 for new plywood or OSB sheathing, depending on how much comes up. A full tie-in rebuild with new flashing, underlayment, and shingles on both sides of the seam runs $6,000 – $11,000.
We give you a written price before any work starts. That number includes tear-off, disposal, new underlayment, flashing, shingles, ridge cap, and cleanup at close. The 365-Day Done Right Promise covers the workmanship for a full year. If the roof we installed leaks inside that window, we come back and correct it at no charge. Straight number, clear scope, no surprises at close-out.
For the full addition or ADU itself, the range in Tampa is $45,000 – $130,000. That includes plans, permits, foundation, framing, roofing, rough-in for the utilities, drywall, paint, and close-out with a signed written guarantee in your hand.
| Scope | Tampa Installed Range |
|---|---|
| Addition roof re-shingle (300 – 500 sq ft) | $4,500 – $8,500 |
| Decking replacement (as needed) | $1,200 – $3,000 |
| Tie-in rebuild with new flashing | $6,000 – $11,000 |
| Full home addition | $45,000 – $130,000 |
| ADU construction (detached) | $90,000 – $220,000 |
| Garage conversion | $30,000 – $80,000 |
DIY or Call Us?
A failed addition roof is not a weekend fix. The hazard on any roof in Tampa is the pitch combined with the heat, and an addition roof is often steeper than the main roof because the architect was working with a smaller footprint. Falls from roofs keep emergency rooms busy here, and that’s before you get into the tie-in flashing work, which requires removing shingles on both sides of the seam without damaging the good side. If you’re on a ladder and pulling shingles off the main roof to get at the tie-in, you’re already past the point where a homeowner should stop.
What you can safely do: look at the roof from the ground with binoculars and note where the granule loss or lifting is. Check the ceiling inside for the straight-line staining pattern we described. Take photos. Then call us. A trained roofer or remodeler who knows IKO’s installation specs can diagnose the failure in one visit and give you a written price that doesn’t change at the door. Call (941) 655-9297 and we’ll give you a straight answer.
FAQs
A properly installed IKO architectural shingle roof on a Tampa addition should last 20 – 30 years, but the Florida reality is that heat, UV, and wind events shorten that on the sections that face south and west. The tie-in point will fail before the field of the roof if the flashing was not installed to IKO’s spec. We see the tie-in fail at 10 – 15 years on additions done by remodelers who subbed the roofing to the low bidder.
Yes, if the rest of the addition roof is in good shape. We remove the shingles around the seam, replace the step flashing and head wall flashing, re-install the underlayment per IKO’s high-wind spec, and shingle back up to match the existing exposure. The repair runs $1,200 – $3,000 in Tampa depending on the length of the seam and whether the wall siding has to come off to reset the counter-flashing. Get an exact number with a free estimate.
For a typical Tampa addition roof, one to two days for the roof itself, assuming the decking is sound. If we find rot and have to re-sheet, add a day. A full tie-in rebuild with wall work can run three to four days. We schedule the work, show up on the day we said we would, and keep the site clean while we’re on it.
Yes, we keep IKO Cambridge and Dynasty shingles plus Hip & Ridge cap and StormShield underlayment on the truck for exactly this kind of repair. The advantage is that we can match the existing shingle profile on the day we show up, not order it and hope the color batch matches. On an existing roof that’s been up for a few years, we may recommend the closest current production color and show you the sample before we nail anything down.
If you’re looking at a stain on the ceiling or granule in the gutter, call (941) 655-9297 to schedule a free estimate. We’ll give you a written price, explain every line item, and send background-checked, uniformed technicians who sign in with you before the work starts. Bradford Remodeling Co Tampa has been held to The Garrison Standard since 2004: written price before any work begins, a 365-Day Done Right Promise on the completed job, and a live person on the phone 24/7.
Written by Curtis Lane, Owner, Bradford Remodeling Co Tampa at Bradford Remodeling Co Tampa, serving Tampa and nearby areas.
