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IKO Home Additions & ADU: The Pasadena Owner’s Guide
IKO home additions and ADU construction in Pasadena typically runs $45,000 to $130,000 for a full addition, with a detached ADU landing between $90,000 and $220,000 depending on size and finish level. We install IKO-compatible roofing and exterior products as part of every addition we build, and we stock the most common IKO materials on our trucks so we’re not sending a runner to a supply yard mid-job. Most Pasadena homeowners call us when they notice water staining on a ceiling where an old addition ties into the main house, or when they realize their garage conversion has zero insulation and the summer heat turns it into an oven.
At Sawyer Remodel Pasadena, we’re an independent contractor, not affiliated with IKO the manufacturer. We install IKO products because they hold up in Southern California sun, but the company itself has no say in how we price or run our work. That’s our call, and we put it in writing before a single board gets cut.
Which IKO Models This Applies To
IKO makes a full line of residential roofing, underlayment, and exterior sheathing products, and most of what we install falls into three families: the Cambridge architectural shingle line, the Dynasty performance line, and the Roof-Fast synthetic underlayment. For additions and ADUs in Pasadena, the Cambridge series is the most common choice because its dimensional profile matches the look of older craftsman homes without the weight of true cedar or clay. The Dynasty line carries a higher wind rating, which matters when you’re building a two-story addition that catches the Santa Ana gusts coming through the foothills.
Compatibility gotcha: IKO shingles are not mix-and-match across their own lines. Cambridge and Dynasty have different exposure widths, so if an existing roof has Cambridge and you’re tying a new addition into it, you can’t just grab Dynasty because it’s on sale. The reveal lines won’t align, and every roofer who drives by will see the seam. We match the existing shingle line exactly, or we re-roof the entire structure so the whole thing reads as one plane. If you have leftover bundles from the original install, check the wrapper for the product code: Cambridge starts with “CA,” Dynasty with “DY.”
The underlayment choice matters just as much in Pasadena. Roof-Fast synthetic holds up better than felt in our dry heat, but it traps moisture if it’s installed over damp sheathing. We’re careful about that because we’ve torn off additions where the underlayment did more damage than the missing shingles.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
- Water staining where the addition meets the main house. This is almost always a flashing failure at the transition, not an IKO product problem. The shingles stay fine while the metal lets water run behind them. It’s also the most common call we get for additions built by other contractors.
- Granule loss piling up in gutters. IKO shingles shed some granules in their first year, but a visible stream of black grit after year three means UV breakdown is accelerating. On ADUs with low-slope sections, that loss happens faster on the sun-facing plane.
- Curling or lifting at shingle edges. Pasadena’s temperature swings, hot days and cool nights, cause thermal movement that eventually breaks the adhesive strip. Once edges lift, wind gets underneath and starts peeling.
- Soft spots in the sheathing under the roof deck. This is a structural problem, not a shingle problem. It means moisture has been getting in for a while, and by the time you feel a soft spot walking the roof, the sheathing is compromised and possibly the rafter tails too.
- Ceiling cracks inside the addition after heavy rain. That crack tells you the addition’s roof is moving slightly, usually because drainage isn’t carrying water away fast enough and the framing is absorbing moisture. It’s a warning sign, not a cosmetic issue.
Replacement Cost & What’s Included
Here’s what we quote for IKO-related addition and ADU work in Pasadena, with the numbers on paper before any work starts.
- Full home addition (with IKO Cambridge roofing): $45,000 – $130,000
- Detached ADU construction: $90,000 – $220,000
- Garage conversion to living space: $30,000 – $80,000
- Roof replacement on an existing addition (IKO Cambridge): $8,000 – $20,000
- Roof repair on an addition or ADU: $400 – $1,800
The big range on additions comes down to permits, foundation work, and whether the existing roof line allows a clean tie-in. A second-story addition in a hillside neighborhood costs more than a ground-floor bump-out. Every quote includes the written price, the IKO materials specified by name, labor, and our 365-Day Done Right Promise: if it’s not done right, we make it right. That’s in writing, not a handshake.
See the difference
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After
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AfterDIY or Call Us?
You can do a visual check yourself: look for missing granules, lifted shingle edges, or staining on interior ceilings after rain. But once you’re on a ladder with a pry bar, you’re in the danger zone. IKO shingles on a roof pitch common in Pasadena additions, 4:12 or steeper, are slick in the morning dew and slippery in the afternoon heat. Falls from single-story roofs cause thousands of serious injuries every year. And the tie-in detail where an addition meets the main house is the place where DIY work fails most often. That’s where the water gets in, and by the time the homeowner sees the stain, the repair costs triple.
If you’re seeing any of the signs above, call us at (626) 657-5396 for a free estimate. We’ll get on the roof, take photos, and tell you what’s actually wrong before you spend a dollar.
FAQs
IKO architectural shingles in Pasadena’s climate typically last 20 to 30 years, but the sun-facing slopes in neighborhoods like Bungalow Heaven lose granules faster than shaded planes. Call (626) 657-5396 and we’ll tell you if your roof has real life left or if you’re nursing it along.
Most IKO roofs can be repaired if the damage is isolated to a few shingles or a flashing detail, and we do those repairs for $400 to $1,800. If the underlayment or sheathing is compromised, replacement is the honest answer. Call (626) 657-5396 for a free inspection and a straight answer either way.
A typical IKO roof replacement on an addition or ADU in Pasadena takes 2 to 5 working days, depending on tear-off, sheathing repairs, and the roof’s complexity. We send you photo updates before and after, and you get a live arrival time so you’re not sitting around waiting.
We stock IKO Cambridge shingles and Roof-Fast underlayment on our trucks because they cover most Pasadena additions and ADUs. Specialty IKO products get ordered per job, and we confirm the exact product code with you before ordering. Call (626) 657-5396 to confirm what’s in stock for your project.
Ready to Get a Written Price?
The work tells you everything. You just have to know how to listen to it. I’ve been reading roofs and additions across Pasadena for over two decades, and I’ll tell you exactly what’s wrong and what it costs before any work starts. No surprises at the invoice, no guessing. Call Sawyer Remodel Pasadena at (626) 657-5396 for a free estimate, and you’ll have a written number in your hands before we pick up a tool.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Pasadena at Sawyer Remodel Pasadena, serving Pasadena and nearby areas.
