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IKO Home Additions & ADU: The Houston Owner’s Guide
Home additions and ADUs in Houston typically run $45,000 – $130,000 for a properly permitted build, with detached ADUs landing between $90,000 and $220,000 depending on square footage, foundation work, and finish level. We install IKO-compatible roofing and structural components on additions and accessory dwelling units across Houston, and we carry the common IKO profiles on our trucks for repair and replacement work. Most Houston homeowners call us when they notice water staining on a ceiling, shingle granule loss in gutters after a storm, or when a home inspection flags the existing roof before they build up or out. If you’re planning an addition or ADU and the existing roofline ties into IKO materials, getting the underlayment, flashing, and shingle match right before the first wall goes up saves you real money later.
Which IKO Models This Applies To
IKO manufactures several shingle lines that show up on Houston-area additions and ADUs, most commonly the Cambridge, Dynasty, and Nordic architectural series. The Cambridge line is the one we see most often on existing homes where an owner is adding a bedroom, a second-story bump-out, or a detached ADU with a roof that ties into the main structure. Identifying your IKO product is straightforward: look for the manufacturer’s name printed on the shingle wrapper (if any bundles remain in the garage or attic) or measure the shingle exposure. Cambridge shingles expose roughly 5 5/8 inches; Dynasty runs the same architectural profile but with a heavier mat and wider nailing band. The compatibility gotcha that catches Houston homeowners: IKO discontinued certain color blends over the years, so a spot repair on an older roof often requires either a close-match from a current line or a full reroof of that slope. We carry the most common Cambridge colors in Houston (Driftwood, Dual Black, Weatherwood) and can order the rest through our supply partners within a week.
On the OEM-versus-aftermarket decision: for IKO shingles specifically, we recommend staying with genuine IKO product for anything visible on the roof plane. Aftermarket sealants, ridge caps, and underlayments from other manufacturers don’t carry the same wind warranty alignment, and Houston’s storm season will test that seam. For non-visible components like synthetic underlayment, decking, and flashing, we use trade-grade materials from James Hardie and GAF where they outperform or match IKO specs. Penhallow Remodeling is an independent contractor, not an IKO dealer or affiliate, which means we match the product to your existing roof rather than pushing whatever’s sitting in our warehouse.
Styles & brands we work with
Signs Your IKO Home Addition or ADU Roof Is Failing
- Granule loss in gutters after a storm. Houston’s spring thunderstorms strip asphalt granules from aging IKO shingles. If your downspout splash blocks look like they’re collecting black sand, the shingle mat is exposed and UV damage accelerates from there.
- Curling or cupping shingle edges on the west-facing slope. Afternoon sun and Gulf humidity break down the asphalt’s flexibility. Curling edges mean the self-sealing strip is failing, and wind-driven rain will find its way underneath.
- Staining on the ceiling inside the addition or ADU. This tells you water already passed the shingle layer, the underlayment, and the decking. By the time a stain shows, the leak has been there for weeks or months.
- Missing shingles after high wind. IKO’s nailing band is forgiving, but nails that were over-driven during the original install don’t hold in the gusty bands that roll through Meyerland and Bellaire. Missing shingles on one slope often mean more are loose nearby.
- Soft spots when walking the roof or attic decking that feels spongy. This is deteriorated decking from slow, repeated moisture exposure. Houston humidity means decking never truly dries once it’s saturated, so the fix is panel replacement, not just shingle work.
See the difference
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AfterReplacement Cost & What’s Included
For a full IKO re-roof on a Houston home addition or ADU, plan on $8,000 – $20,000 for a typical addition footprint (500 – 1,500 square feet of roof plane), which includes tear-off, decking repair where needed, new synthetic underlayment, IKO shingles, ridge cap, and flashing replacement at every tie-in point. If the work is a spot repair rather than a full replacement, those typically land between $400 and $1,800 depending on slope count and how far the damage runs. What drives the number: roof pitch (anything steeper than 6/12 adds labor), decking condition, number of pipe boots and vents, and whether the tie-in between the original house and the addition needs re-flashing. Every quote from Penhallow includes a written line-item breakdown before work starts, and the 365-Day Done Right Promise covers the install for a full year. If something fails inside that window, we come back and fix it at no charge. That’s the number on day one, and that’s the number on the invoice.
DIY or Call Us?
The honest split: a homeowner can safely check their gutters for granule buildup, look for lifted shingle tabs from the ground with binoculars, and note any ceiling stains inside the addition or ADU. That’s where DIY should stop. Walking a roof in Houston after a rain is how people end up in urgent care, and a misplaced nail through an IKO shingle voids the manufacturer’s warranty on that section. We’ve pulled more “I fixed it myself” patches off Houston roofs than we can count, and the water damage underneath always costs more than the repair would have. If you see signs of failure, call (254) 527-5340 and we’ll send a background-checked, uniformed technician to give you a straight assessment and a written number. Give me the straight story on what you need, and I’ll give you the straight number on what it costs.
FAQs
In Houston’s climate, IKO architectural shingles typically last 18 – 25 years, with the lifespan shortened by exposure on west-facing slopes, tree cover that holds moisture, and the frequency of severe storms. The manufacturer’s material warranty runs longer, but Houston’s heat and humidity are the practical limiting factor.
Yes, when the damage is isolated to one or two slopes and the remaining shingles still have granule retention and flexibility, a spot repair runs $400 – $1,800 and adds 3 – 8 years of life. If the shingles are brittle across the whole roof plane, patching is throwing money at a losing game. Call (254) 527-5340 and we’ll tell you which situation you’re in, no charge for the assessment.
A full tear-off and re-roof on a typical Houston addition completes in 2 – 4 working days, weather permitting. Spot repairs are usually same-day, given that the shingle color match is on our truck or available at our supplier. Workmanship is covered by the 365-Day Done Right Promise.
We stock the common IKO Cambridge colors (Driftwood, Dual Black, Weatherwood) on our trucks for same-day repairs, along with matching ridge caps and the flashing profiles most Houston additions use at tie-in points. Less common colors or the Dynasty and Nordic lines are in hand within 3 – 7 business days through our supply partners. We also work with KraftMaid and Cambria products where the addition or ADU includes finish work, which lets us handle the whole job under one written price.
Written by Trevor Nash, Owner, Penhallow Remodeling Houston at Penhallow Remodeling Houston, serving Houston and nearby areas.
Ready to get a written number on your Houston home addition or ADU roof work? Call (254) 527-5340 to schedule your free estimate. A real person answers, no voicemail maze.
