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IKO Home Additions & ADU: The Los Angeles Owner’s Guide
If you’re planning a home addition or ADU in Los Angeles with IKO roofing components, plan on $53,100 to $153,400 for a full addition, and $106,200 to $259,600 for a standalone ADU. Bradford Remodeling installs and integrates IKO shingle systems, underlayment, and flashing as part of every addition and ADU we build, and we keep IKO-compatible materials in our Los Angeles supply chain so the roof package doesn’t stall the framing schedule. Most owners call us because either a previous addition is leaking at the tie-in point where the new roof meets the original house, or they want to know the real cost of an ADU before they pull the trigger on plans.
Here’s what we tell every homeowner before a single tool comes out: the difference between a $53,100 addition and a $153,400 addition in Los Angeles isn’t mystery markup. It’s foundation work, tie-in complexity, seismic detailing, and the roof system you choose. IKO makes good shingles. We’ll get into exactly what that means below.
Which IKO Models This Applies To
IKO’s architectural shingle lines, including Cambridge, Dynasty, and Nordic, are the products we see most often on Los Angeles additions and ADUs. They differ in wind rating, algae resistance, and weight: Nordic is the heaviest at roughly 400 pounds per square, Dynasty sits mid-range around 340, and Cambridge is the entry architectural at about 290. For an ADU or addition in Los Angeles, all three meet California Title 24 cool-roof requirements when you select the right color profile, but not every color qualifies, so check the specific IKO shade against the state’s aged solar reflectance index before you order.
The compatibility gotcha most homeowners miss: IKO underlayment and flashing are engineered as a system. If a previous contractor paired IKO shingles with a mismatched synthetic underlayment from another manufacturer, the manufacturer warranty on the IKO product is void. At Bradford, we match the underlayment, ice-and-water shield at the tie-in, and ridge cap to the shingle line, so the whole assembly stays warrantable. For additions specifically, the transition flashing where the new roof plane meets the existing house is the number-one leak point we correct on jobs we didn’t originally build.
We stock IKO Cambridge in the two most common Los Angeles colorways (charcoal gray and weathered wood) on our truck, and we can source Dynasty or Nordic in about three days. The other brands we stock parts for around here, KraftMaid for cabinets, Cambria and Silestone for countertops, don’t affect the roof assembly. Different trade, different aisle.
Styles & brands we work with
Signs Your IKO Home Addition or ADU Is Failing
- Staining on the ceiling where the addition meets the original house. This is almost always failed step flashing or a poorly lapped transition at the tie-in. Water runs downhill, and the seam where two roof planes meet is where gravity does its worst work.
- Granule loss in the gutters or at downspout outlets. Some granule loss is normal in the first season. A steady stream of granules after year three means the asphalt mat is oxidizing faster than it should, which happens when attic ventilation in the new space was undersized.
- Ponding water on a flat or low-slope ADU roof section. IKO shingles aren’t rated for dead-flat applications. If your ADU roof pitch is under 2:12, shingles are the wrong system, full stop, and no amount of sealant will fix that.
- Wrinkled or buckled shingles near the ridge or at the eave edge. That’s expansion and contraction from a deck that wasn’t properly gapped or an underlayment that’s working against the shingle layer. It’s not cosmetic: buckled shingles catch wind and tear.
- Dark streaks running down the wall directly under the rakes or eave returns. That’s not algae. That’s water getting back behind the drip edge and riding the fascia, which means the starter course or the underlayment termination was done wrong.
We see these failures in Los Angeles year-round, but the wet months between December and March surface them fastest. An addition roof that leaks only during a particular storm pattern hasn’t failed a little, it’s been failing quietly since it was installed.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a new IKO roof system on an addition or ADU in Los Angeles, you’re looking at $9,440 to $23,600 for a full tear-off and replacement. That’s the roof package only. The $53,100 to $153,400 range for a full addition, and $106,200 to $259,600 for an ADU, includes foundation, framing, electrical rough-in, plumbing rough-in, drywall, flooring, windows, and the roof assembly, with the IKO material spec listed on the written scope.
What drives the roof price within that $9,440 to $23,600 range: roof square footage, pitch, tear-off of an existing layer versus new construction, the IKO line you choose (Cambridge is the most economical, Nordic the most substantial), and whether there’s a tie-in to an existing roof plane that needs re-flashing. Every Bradford quote is a line-item written price. The roof line reads: specific IKO product, squares, underlayment, flashing at the tie-in, ridge cap, disposal, and the labor to install it. No “roof: included” line. You see the number before we commit.
The 365-Day Done Right Promise applies to the roof work on your addition or ADU. If the roof leaks or the flashing fails within the first year, we come back and make it right at no charge. That’s in writing, signed, in your hand at job close.
DIY or Call Us?
You can safely inspect your addition or ADU roof from the ground with a pair of binoculars. Look for missing shingles, lifted edges, granule buildup in the gutters, and discolored spots around the tie-in. You should not get on the roof. Steep-pitch additions in Los Angeles hillside areas, like Hollywood Hills or Mount Washington, are genuinely dangerous without fall protection, and no homeowner should be walking a 7:12 pitch to save a few hundred dollars.
What you shouldn’t do yourself: re-flash a tie-in, replace shingles on the roof deck, or re-seal anything with a caulk gun from the hardware store. We’ve taken apart enough of those repairs to know the pattern: the leak always comes back, usually into the same ceiling, and now the substrate is wet and the repair is twice as expensive. If you want to know whether the roof on your addition or ADU actually needs work, call (903) 568-7222. Curtis Lane will tell you straight whether it’s a repair or a replace, and what it costs either way. Straight number, real scope, no surprises at the punch list.
FAQs
An IKO architectural shingle roof installed over a properly ventilated deck in Los Angeles should hold for 25 to 30 years, but the Los Angeles sun and the dry oxidation cycle knocks the realistic service life of the granular surface to around 20 years before you’ll want to look at it closely.
If you’re weighing Cambridge versus Dynasty, the heavier mat on Dynasty buys you another 3 to 5 years in our climate. Call (903) 568-7222 to get a written price on either line.
Yes, if the failure is isolated: a missing shingle, a torn section at a pipe boot, or flashing that needs to be re-seated at the tie-in is a repair, and that runs $470 to $2,125 in Los Angeles depending on access and scope. If the shingles are granulating, buckling, or the deck is soft, repair just buys you a season.
We’ll tell you which one you have. Call (903) 568-7222 and we’ll take a look.
For a standalone ADU, a tear-off and re-roof with IKO Cambridge or Dynasty is a two-day job for our crew. A tie-in to an existing house roof adds a third day because the transition flashing has to be cut, lapped, and water-tested.
We’ll give you the exact sequence of days in writing before we start. Call (903) 568-7222 to schedule the walkthrough.
We keep IKO Cambridge in charcoal gray and weathered wood on the truck in Los Angeles, and we can have Dynasty or Nordic on-site within three working days. The underlayment, ice-and-water shield, and ridge cap are matched to the shingle line so the system warranty stays intact.
If you need a specific color, call (903) 568-7222 and we’ll confirm availability before we write the quote.
Call Bradford Remodeling at (903) 568-7222 for a free estimate on your IKO home addition or ADU project in Los Angeles. A live person answers. You’ll get a written price before any work starts, and every project is covered by the 365-Day Done Right Promise.
Written by Curtis Lane, Owner, Bradford Remodeling at Bradford Remodeling, serving Los Angeles and nearby areas.
