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IKO Home Additions & ADU: The Miami Owner’s Guide
If you’re planning an IKO home addition or ADU in Miami, expect to pay between $53,100 and $153,400 for the full scope, depending on square footage, foundation type, and whether you’re building up or out. We stock IKO-compatible structural components and finishing materials, and we can usually begin the planning and permitting phase within a week of your first call. The part most owners discover they need help with isn’t a single component: it’s the full assembly of framing, roofing underlayment, and waterproofing that has to work together under Miami’s rain, humidity, and wind loads. When one piece is wrong, the whole addition shows it within eighteen months.
We’re an independent general contractor in Miami, not affiliated with IKO. That matters because we can spec the right IKO product for your project without being tied to one distribution channel, and we can tell you honestly when a different manufacturer’s flashing or underlayment will do the job better at a lower price.
Which IKO Models This Applies To
IKO makes a range of products that show up in home additions and ADUs across Miami: architectural asphalt shingles (the Cambridge and Dynasty lines), synthetic underlayment, ice-and-water shield, and roofing felt. For an addition, the roof system is where IKO parts most often come into play. If you’re matching an existing roof, the shingle line matters more than you’d think. Cambridge and Dynasty have different exposure widths and different shadow lines, and they don’t mix well on the same plane. We see additions in Coconut Grove where a contractor used whatever was on the truck, and now the homeowner has a roof that looks like two different houses.
The simple way to identify what you have: look at the shingle tab. Cambridge has a 5-5/8 inch exposure. Dynasty runs wider at 5-7/8 inches. If you don’t have a bundle label left, that measurement plus the shingle color against an IKO color chart gets you within a shade of a match. For OEM versus aftermarket, we use genuine IKO material when we’re matching an existing IKO roof. Aftermarket equivalent underlayment is often fine and costs 15 to 20 percent less, but we won’t substitute without telling you first, in writing.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Water staining at the addition’s roofline. This usually means the underlayment or ice-and-water shield was skipped or lapped wrong. In Miami’s summer downpours, that mistake shows up fast.
- Shingles curling or lifting along the addition’s eaves. IKO shingles need proper attic ventilation underneath. If the addition’s roof deck wasn’t vented correctly, trapped heat and moisture cook the shingles from below.
- Gaps where the addition ties into the original house. This is a structural movement issue. The new foundation settles at a different rate than the old one, especially in parts of Miami with high water tables. Without a proper expansion joint and flashing detail, you get cracks and leaks.
- Nails backing out of the roofline. In Miami’s humidity, the decking swells and shrinks through the seasons. If the wrong nail length or pattern was used, the nails walk out and the shingles go with them.
- Sagging ridge line on the addition. This is the one that worries us most. It means the roof framing was undersized for the span or the rafter ties weren’t installed correctly. It’s a structural fix, not a shingle fix.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
For a full IKO home addition in Miami, budget $53,100 to $153,400. A smaller single-room bump-out sits at the lower end. A multi-room addition with a new roofline, full bath, and kitchenette runs toward the top. An ADU construction project runs $106,200 to $259,600, which reflects the separate electrical service, kitchen, and bath that make it a legal dwelling unit.
Here’s what pulls the number in one direction or the other:
- Foundation type. Slab-on-grade is the cheapest. Pier and beam adds $8,000 to $15,000 in Miami because of soil conditions and code requirements.
- Roofline complexity. Tying a new roof into an existing IKO roof costs more than a simple shed roof. Each valley and transition is a leak waiting to happen if done wrong.
- Square footage and finish level. Drywall, paint, and a simple bath are one thing. Custom tile, Cambria quartz countertops, and a full kitchen are another. We install Cambria, Silestone, and KraftMaid cabinetry in Miami additions regularly, and those hold their own warranties alongside our 365-Day Done Right Promise.
Every line item is in writing before we start. The number on day one is the number on the invoice. If something on the IKO side fails inside a year, we come back and fix it at no charge. That’s not a sales line. It’s in the written guarantee on every project.
DIY or Call Us?
You can check a few things yourself: look for lifted shingles after a storm, take photos of stains at the roofline, and note whether doors in the addition stick through the year, which suggests settling. But replacing IKO components on a home addition is not a weekend job. Roof work on a two-story addition means working at height. Framing corrections mean cutting into structure. In both cases, the risk of a fall or a framing mistake is real, and the repair cost after a failed DIY attempt usually exceeds what the original fix would have cost.
Trevor Nash says it plainly: “Give you a number first, then pick up the tools.” Call (850) 988-7559 and we’ll walk the addition with you, put the scope and price in writing, and tell you honestly what needs doing now and what can wait.
FAQs
An IKO architectural shingle roof in Miami typically lasts 18 to 25 years when installed with proper underlayment and ventilation. Miami’s UV exposure and storm-driven rain cut into that lifespan compared to drier or cooler climates. Call (850) 988-7559 and we’ll assess what shape yours is in and give you a written estimate for any correction needed.
Yes, if the problem is localized: a section of lifted shingles, a failed flashing seam, or a ventilation correction. If the issue is structural, like a sagging ridge or a failing tie-in, patching won’t hold. We’ll tell you which one you have before we quote anything. Call (850) 988-7559 for an honest assessment.
A single-room addition with a simple roof takes 10 to 14 weeks from permit to punch list. A full ADU with bath and kitchen typically runs 5 to 7 months. The roof portion of an addition is usually done in a week once framing is up. Call (850) 988-7559 and we’ll map out the schedule for your specific scope in writing.
We keep common IKO underlayment, ice-and-water shield, and flashing materials on hand, and we order shingle colors and volumes to match your existing roof. Using the right IKO product for the job is how the 365-Day Done Right Promise stays true. Call (850) 988-7559 to schedule a free estimate for your Miami addition or ADU.
Written by Trevor Nash, Owner, Penhallow Remodeling Miami at Penhallow Remodeling Miami, serving Miami and nearby areas.
