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IKO Home Additions & ADU: The Miami Owner’s Guide
IKO home additions and ADU construction in Miami typically runs $53,100 to $153,400 installed, depending on square footage, foundation work, and whether you’re adding a room or building a detached accessory dwelling unit. We stock the structural and finishing materials needed for IKO-spec additions and can usually start your project within a two-week window once permits clear. Most homeowners discover they need this level of work when a growing family outpaces the floor plan, or when a rental ADU stops penciling out because the existing structure wasn’t built to Miami-Dade wind codes in the first place.
Which IKO Models This Applies To
If your home’s envelope carries IKO roofing, underlayment, or waterproofing products, an addition has to tie into those systems correctly or you’ll be fighting leaks at the seam for the life of the structure. The compatibility question isn’t about a single IKO “model” the way it is with an appliance. It’s about matching slope, drainage plane, and flashing details so the new roof plane doesn’t dump water onto the old one. We identify your existing IKO product by pulling a shingle or checking underlayment labels at the eave, then spec the addition to meet Miami-Dade County’s current wind-load requirements rather than whatever code was in effect when the original structure went up.
On the OEM-versus-aftermarket question: IKO’s own underlayments and ice-and-water shields are what we recommend at every transition point. For framing, sheathing, and interior finishes, we use manufacturer-backed products from our standard material partners, including KraftMaid, Cambria, and Silestone where interior surfaces are involved. There’s no practical advantage to chasing IKO-branded lumber, because IKO doesn’t make lumber. What matters is that the waterproofing layer is genuinely IKO-compatible, and that’s where we don’t substitute.
Styles & brands we work with
Signs Your IKO Home Addition or ADU Is Failing
- Water staining at the seam where old roof meets new. This is the classic failure point on additions. The original IKO membrane wasn’t properly lapped under the new flashing, and Miami’s afternoon downpours find the gap in minutes.
- Doors that stick or crack above interior doorways. Differential settling between the original slab and the new foundation. In Miami’s sandy, shifting soil, corners cut on soil compaction show up within two years.
- Mold smell that won’t go away in the new space. IKO waterproofing done wrong traps moisture instead of shedding it. You’ll smell it before you see it, especially in ADUs built over crawl spaces.
- Visible gaps at the roofline or fascia where the addition meets the house. Wind-driven rain gets pushed horizontally in hurricane season. Any gap wider than a quarter inch is an open invitation.
- Your ADU can’t pass a rental inspection. Miami-Dade enforcement has tightened significantly on unpermitted additions and ADUs. If the work was done without permits or wind-mitigation documentation, you’ll find out when the inspector flags it.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
Here’s what we quote in Miami, with the written price in your hands before any work starts:
- Home addition (room or suite): $53,100 – $153,400
- ADU construction: $106,200 – $259,600
- Garage conversion to living space: $35,400 – $94,400
The spread depends on square footage, foundation type, roof tie-in complexity, and whether you’re upgrading the electrical panel to handle the new load. Every estimate includes permits, materials, labor, and the IKO waterproofing integration. What you approve is what you pay. Our 365-Day Done Right Promise covers the work for a full year after we close the project. If something wasn’t done right, we make it right, in writing, no argument.
DIY or Call Us?
You can measure your existing footprint, check your survey for setbacks, and look at your panel’s amperage to see if an ADU is even feasible on your lot. That homework saves you time and gives you a realistic ballpark before you call anyone. What you shouldn’t do is pull a permit and start framing or tying into an IKO roof system yourself. Roof transitions done wrong leak inside your walls where you can’t see the damage until it’s structural. One mis-lapped underlayment seam in Miami means mold, rot, and a tear-out that costs more than the original addition. As Luca Romano says, good work doesn’t need a sales pitch. It does need a licensed contractor who signs the permit. Call (850) 801-8046 and we’ll walk the site and give you a written price.
FAQs
A properly built addition with correct IKO waterproofing integration should last 50 years or more on the structure, with the roof membrane needing replacement around the 20 to 25 year mark in Miami’s UV and heat load. The failure we see most often isn’t the materials aging out; it’s the transition detail failing at year three because someone cut a corner on flashing. Call (850) 801-8046 if you want us to inspect an existing transition before it becomes a bigger problem.
Yes, if the failure is in the waterproofing transition, the flashing, or a door/window opening. If the foundation is settling or the framing wasn’t strapped for wind load, you’re looking at a rebuild of that section. We’ll tell you which one you have after a site walk, and our written estimate includes only what’s actually needed. Estimates are free; call (850) 801-8046.
Most additions run 8 to 16 weeks once permits are issued. ADUs run 4 to 8 months depending on size, foundation, and utility connections. Permit review in Miami-Dade County is the variable we can’t control; what we do control is showing up with background-checked, uniformed technicians on the schedule we agree to, with photo updates before and after every major phase. Call (850) 801-8046 for a realistic timeline on your specific project.
We keep IKO underlayments, ice-and-water shield, and flashing materials on hand for the common roof tie-in scenarios, and our material partners in Miami carry the rest of the IKO product line with a one-week lead time on special orders. We don’t make you chase down materials. We handle sourcing, delivery, and the manufacturer warranty paperwork. Sawyer Remodel Miami is an independent service provider, not affiliated with IKO, which means we’re free to tell you exactly what works and what doesn’t.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Miami at Sawyer Remodel Miami, serving Miami and nearby areas.
