IKO Home Additions & ADU Nationwide

IKO Home Additions & ADU: The Los Angeles Owner’s Guide

If you own an IKO product and the part that ties your home addition or ADU together is failing, we stock the IKO-compatible components to fix it. A full IKO home addition or ADU project in Los Angeles typically runs $53,100 – $153,400 depending on square footage, foundation work, and whether you’re converting existing space or building new. Most owners discover the problem the same way: a door stops seating, a roofline sags half an inch, or water shows up where it never did before. We’re an independent remodeling company, not affiliated with IKO, but we work with their product lines every week.

Call (936) 259-2607

Key takeaways:

• IKO home additions and ADUs in Los Angeles run $53,100 – $153,400 installed.
• We stock IKO-compatible components and can source OEM parts on request.
• Every job gets a written price before work starts and a 365-Day Done Right Promise in writing.

Which IKO Models This Applies To

IKO’s product line spans roofing, waterproofing, and insulation systems that show up routinely in Los Angeles home additions and ADUs. The compatibility question usually comes down to what’s already on your structure. IKO shingles come in specific profiles: Cambridge, Dynasty, and Nordic lines each have different exposure widths and nail strips, so the part that failed on a Cambridge roof won’t necessarily interchange with a Dynasty one. The quickest way to identify what you have is to check the wrapper in your garage or the underside of a shingle tab for the series name. If that’s gone, measure the exposure: Cambridge runs 5 5/8 inches, Dynasty 5 7/8. That eighth of an inch tells us exactly what to order.

In Los Angeles, we see a lot of IKO underlayment failures on flat-roof ADU sections too. The Armourvent and GoldShield lines get paired with torch-down systems, and the compatibility gotcha is that IKO’s self-adhered underlayment requires a primed substrate. Skip the primer and the membrane peels within two summers. For aftermarket equivalents, there are solid options, but we generally recommend OEM for IKO roofing because the warranty stack matters: IKO’s own material warranty only honors their components, and pairing it with our 365-Day Done Right Promise means two layers of protection instead of one.

Signs Your IKO Home Additions & ADU Is Failing

• Granule accumulation in gutters or downspouts. IKO shingles shed granules as the asphalt layer breaks down under Los Angeles UV exposure. If you’re seeing a tablespoon of granules per linear foot of gutter, the shingles are past the halfway point of their life.
• Curling at shingle edges on the south and west exposures. Those are the surfaces that take the worst afternoon sun. Curling means the asphalt has lost its flexibility and the shingle can no longer lie flat, which lets wind-driven rain underneath.
• Water staining on the underside of roof decking inside the ADU. This is the one that usually triggers the call. By the time the stain shows on drywall, the IKO underlayment has already been breached for weeks.
• Loose or missing shingles after a Santa Ana wind event. IKO products are tested for wind uplift, but repeated gusts over 50 mph find every weak nail strip. One missing shingle is a repair; five or more spread across the field usually means the roof has reached the end of its serviceable life.
• Bubbling or ridging in flat-roof sections. ADUs with low-slope roofs trap heat and moisture. When the IKO membrane bubbles, trapped vapor is delaminating the material from the deck, and that won’t self-correct.

Replacement Cost & What’s Included

For Los Angeles homeowners, a full home addition or ADU project involving IKO products runs $53,100 – $153,400. That’s the honest spread: a 400-square-foot garage conversion with IKO roofing system lands near the bottom, while a 1,200-square-foot detached ADU with new foundation, insulation, and full IKO roofing runs toward the top. A roof-only replacement on an existing ADU using IKO shingles typically falls in the $9,440 – $23,600 range depending on tear-off, deck repair, and slope complexity.

What drives the number: square footage, access (a hillside ADU in Mount Washington costs more to work on than a flat lot in Canoga Park), whether we’re tying into the existing home’s roofline, and the IKO product line you choose. Every quote includes parts, labor, haul-away, and a written warranty. The price we hand you before work starts is the price on the final invoice. No change orders, no “we found something” surprises. If a repair fails inside 365 days, we come back and fix it at no charge. That’s the Kingswell standard, and it’s been that way since 2004.

DIY or Call Us?

What you can safely check yourself: granule buildup in gutters, visible curling from the ground, and whether any shingles are missing after a windstorm. Those observations help us quote accurately over the phone. What we don’t recommend is walking a roof, especially an ADU roof with a slope over 4:12. Roof work is genuinely dangerous: falls are the leading cause of construction fatalities, and a worn IKO shingle surface is slicker than it looks. If a flat-roof section is bubbling, standing on it can pop the membrane and turn a repair into a replacement.

The DIY path for roof components rarely saves money. A bad nail pattern voids the IKO warranty, and a missed seam in underlayment means the first winter rain finds it. Give me the whole picture first, then we pick up the tools. Call (936) 259-2607 and tell us what you’re seeing. We’ll give you a written answer, not a ballpark.

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