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IKO Home Additions & ADU: The Pasadena Owner’s Guide
If you’re planning a home addition or ADU in Pasadena and want IKO roofing or waterproofing products specified into the build, we can help. Elmstead Remodeling Pasadena installs IKO shingles and underlayments as part of our home addition and ADU projects, which typically run $45,000 to $130,000 for an addition and $90,000 to $220,000 for a detached ADU in Pasadena’s current market. Most owners reach out to us after they’ve already spoken to another contractor and want a second, clearer number before committing.
What we hear most often: a family has an aging IKO roof on the main house, wants the new addition or ADU to match, and doesn’t know whether the existing shingle line is still available or whether they’ll need to re-roof everything at once. The answer depends on the specific IKO product, the age of the existing roof, and how Pasadena’s sun exposure has treated the original installation.
Which IKO Models This Applies To
IKO makes several shingle lines that show up on Pasadena homes, and the compatibility question is different for each. The Cambridge line is the most common we see on homes built or re-roofed in the last 15 years. The Dynasty line is a heavier architectural shingle that some owners upgrade to when adding on. The Nordic line appears on higher-end homes and some historic properties in neighborhoods like Bungalow Heaven and the Langham area.
The compatibility gotcha we run into most: IKO has changed color availability on several lines over the years. A Cambridge color from 2012 may not have an exact current match, even if the shingle style is still sold. If your addition needs to tie into an existing roof, we’ll pull a sample and compare it against current IKO color boards before you commit to anything. The alternative, matching as closely as possible with a visible transition line, is something we’ll flag early rather than surprise you with later.
For ADUs, the decision is simpler because the structure is separate. You can match the main house, or you can choose a different IKO product entirely if the budget or the roof pitch calls for it. Either way, we spec the underlayment as carefully as the shingle itself, because Pasadena’s rainy seasons, while short, are intense enough to find any weakness in the decking.
Elmstead Remodeling Pasadena is an independent contractor and not affiliated with IKO. We also stock and install materials from KraftMaid, Cambria, and Silestone on our remodeling projects, so if your addition involves more than roofing, we can keep the material sourcing under one roof.
Styles & brands we work with
Signs Your IKO Home Additions & ADU Is Failing
This section matters most for owners adding onto a home with an existing IKO roof. If the existing roof is near the end of its life, adding a new structure beside it often forces the conversation earlier than planned. Here are the symptoms we see in Pasadena specifically:
- Granule loss in the valley or near the eaves. This shows up as bare patches or grit collecting in the gutters. In Pasadena’s dry heat, the asphalt layer underneath oxidizes faster once the granules are gone, and that’s when leaks begin.
- Curling at the shingle edges. IKO shingles that weren’t nailed to spec, or that have baked under a decade of San Gabriel Valley sun, will start lifting at the corners. Once edges curl, wind-driven rain can get underneath.
- Staining on the ceiling under a flat or low-slope section. Many Pasadena additions and ADUs include a small flat-roof section for a porch or transition. If the IKO underlayment there was installed without proper slope or overlap, water pools and finds the seam.
- Visible gaps at the transition between old and new roof. This is the failure point we look at first when an addition was built years after the original roof. The flashing detail where two roof planes meet is where most leaks originate.
- Moss or algae growth on north-facing slopes. Pasadena’s older neighborhoods have mature trees that shade roofs for most of the day. IKO shingles hold up fine, but organic growth on the shaded side traps moisture and shortens the life of the shingle’s surface.
See the difference
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AfterReplacement Cost & What’s Included
For a home addition in Pasadena, the range is $45,000 to $130,000. For a detached ADU, you’re looking at $90,000 to $220,000. The IKO roofing portion of that work typically accounts for $8,000 to $20,000 of the total, depending on roof size, pitch, and whether we’re tying into an existing roof or starting fresh.
What drives the range is the condition of what’s already there. If your existing roof is sound and the IKO color still matches, the roofing cost stays low. If the old roof needs a full tear-off before we can tie the new addition in, the number climbs. We give you a written line-item price before any work starts, so you’ll see exactly what the IKO materials cost, what the underlayment costs, and what the labor costs. That written price is a Cedarwell Care Promise standard, not an exception. The price you see on paper is the price you pay at the end, no footnotes.
Every home addition and ADU project includes our 365-Day Done Right Promise: if it’s not done right, we make it right. The IKO shingles themselves carry IKO’s manufacturer warranty, which you can verify independently.
DIY or Call Us?
Roofing on a home addition or ADU is not a DIY job, and we say that plainly. The work involves heights, nailing patterns that affect the manufacturer warranty, and flashings that have to be up to code before Pasadena’s building department signs off. A wrong nail placement on an IKO shingle voids the wind warranty, and you won’t know it happened until a Santa Ana wind event peels a section off.
What you can do safely: check your gutters for granule buildup, look for curled shingle edges from ground level, and note any ceiling stains after a heavy rain. That gives us a head start on the diagnosis before we walk the roof. Everything past that, from the tear-off to the final flashing, should be handled by a licensed crew with the right equipment and the right fall-protection setup.
If you’re weighing a repair versus a full replacement on the roof portion of your addition, call us at (626) 714-2992. We’ll walk the roof with you, point out what’s failing and what has life left, and give you a written price for the IKO work before you decide anything.
FAQs
Most IKO architectural shingles last 25 to 30 years in Pasadena’s climate, though the south-facing slopes often show wear 5 to 8 years earlier because of the direct sun exposure. The underlayment matters as much as the shingle. Call (626) 714-2992 if you want us to assess your specific roof’s remaining life, with no obligation.
It depends on the age and condition of the shingles and whether the IKO color is still available. If the existing roof is under 12 years old and the color matches, we can often repair and tie in. If the granules are gone and the color has been discontinued, replacement makes more sense financially. We’ll show you both numbers in writing before you choose.
For a standard addition roof, plan on 3 to 5 working days. A detached ADU roof is usually 2 to 3 days. Weather, roof complexity, and whether we’re tying into an existing roof all affect the schedule, and we’ll confirm the timeline in your written estimate.
We order IKO products per job to make sure the color lot matches and the material is fresh. Ordering per job also keeps costs down, since we’re not paying to warehouse and transport inventory that may sit. The lead time is typically under a week in Pasadena.
Written by Graham Stein, Owner, Elmstead Remodeling Pasadena at Elmstead Remodeling Pasadena, serving Pasadena and nearby areas.
