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IKO Home Additions & ADU: The Dallas Owner’s Guide
We design and build IKO-compatible home additions and ADUs across Dallas, with most projects landing between $45,000 and $130,000 for a finished addition, and $90,000 to $220,000 for a detached ADU. We keep IKO roofing and waterproofing components on hand for the exterior envelope, and we schedule a walkthrough within days of your call. Most homeowners reach out after a leak shows up at the seam where an old addition ties into the main roofline, or when a flat-roof section over a converted garage starts pooling water and the IKO membrane underneath has given out.
You should know who is coming, what it costs, and what happens if something goes wrong, before we ever pick up a tool.
Which IKO Models This Applies To
IKO makes the roofing and underlayment systems that sit on top of home additions and ADU structures, not the framing itself. The parts we most commonly source and install for Dallas additions are IKO’s shingle lines (Cambridge, Dynasty, Nordic) and their low-slope products like Roof-Fast cap sheets and Armourbase underlayment, which show up on flat and low-pitch addition roofs throughout Dallas. The compatibility gotcha most owners miss: IKO’s low-slope membranes are engineered for specific slope ranges, and a flat-roof addition under 2:12 pitch needs the Roof-Fast system, not standard shingles, even if the main house is shingled. You can identify which IKO product you have by checking the selvedge edge of a shingle for the brand stamp, or looking at the original permit paperwork from when the addition was permitted. If you are replacing a section rather than the whole roof, we match the existing shingle profile so the repair line does not stand out.
For the framing, insulation, drywall, and finishes inside the addition, we work with specification-grade material partners like KraftMaid for cabinetry and Cambria or Silestone for surfaces. Mason Remodeling Co Dallas is an independent service provider and is not affiliated with IKO. We simply know their product lines well enough to order the right part the first time.
Styles & brands we work with
Signs Your IKO Home Addition or ADU Is Failing
- Water staining at the roofline where the addition meets the main house. This is the classic dead-flashing failure point. The metal flashing that should bridge old roof and new roof gets skipped or nailed wrong, and a Dallas thunderstorm finds it fast.
- Pooling water on a flat-roof section 48 hours after rain. Dallas sun cooks low-slope membranes, and once the granule surface wears thin, water stops shedding and starts sitting. Standing water on IKO’s Roof-Fast means the cap sheet is past its service life.
- Shingle granules collecting in gutters near the addition. Granule loss is normal at the very end of a shingle’s life, but heavy loss on a five-year-old addition roof tells you the install was poor or the attic ventilation underneath was never corrected.
- Doors or windows in the addition binding at the top corners. This signals foundation movement under the new footprint, which is common in Dallas clay soil. It is not a roofing issue, but it is the first visible warning that the addition needs structural attention before the roof pulls apart at the seams.
- Mold or musty smell in the ADU after rain, with no visible leak. Trapped moisture between the IKO membrane and the decking is nearly always the culprit. By the time you smell it, the decking is already compromised.
Replacement Cost & What’s Included
A full home addition in Dallas runs $45,000 to $130,000 depending on square footage, whether it is a single-story bump-out or a two-story build, and how much of the existing roofline has to come apart to tie in. A detached ADU with its own kitchen and bath runs $90,000 to $220,000 because it needs separate utility runs, foundation work, and its own IKO roof system. A garage conversion sits between $30,000 and $80,000, and the roof condition on the existing garage drives a big chunk of that cost.
What is included in our written price: materials, labor, permits pulled in Dallas, foundation work, framing, roofing, mechanical rough-ins, drywall, paint, and the final trim. What is not included: surprises. We deliver a written price before any work starts, on every project, every time. That number does not move unless you change the scope. Every job is covered by our 365-Day Done Right Promise. If something we built is not right within a year of completion, we fix it at no cost to you.
See the difference
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AfterDIY or Call Us?
You can safely walk your addition and note what you see: granule piles in the gutter, a stained ceiling corner, a door that sticks. Those observations help us quote accurately over the phone. What you should not do is climb onto the roof to inspect the IKO membrane yourself, especially on a low-slope section that has been baking in the Dallas sun. Shingles get slick, the decking underneath may be soft, and a fall from even a single-story addition roofline is a life-changing injury. If the problem is framing, foundation movement, or the tie-in where old roof meets new, that is structural work. Call us at (432) 302-8761 and Isaac Pruett will walk the site himself before anyone writes a number down.
FAQs
An IKO asphalt shingle roof on a properly ventilated Dallas addition typically lasts 20 to 30 years, though the intense Texas UV exposure and hail storms we get in the metro can cut that short by five years or more on a shallow-pitch section. Low-slope IKO Roof-Fast membranes realistically last 15 to 20 years before the granule surface wears through. Call (432) 302-8761 for an exact assessment of your roof’s remaining life.
Yes, in many cases we can replace a section of IKO shingles or patch a low-slope membrane seam without tearing off the entire roof, provided the decking underneath is still solid. If water has been getting in for more than one Dallas rainy season, the decking is usually too far gone to patch, and a partial replacement turns into a full reroof. We will show you photos of what we find before we recommend either path.
A detached ADU in Dallas typically takes 4 to 8 months from permit submittal to final inspection, depending on site conditions, utility runs, and the city’s plan review timeline. A home addition that ties into the existing structure usually runs 3 to 6 months. We put the schedule in writing alongside the price, so there is no guessing about when the crew starts or finishes.
We stock common IKO shingle profiles and low-slope membrane materials at our Dallas yard, and we can have specialty IKO products delivered within a few business days. For full additions and ADUs, we order all exterior envelope materials up front so weather delays do not push the schedule out. Call (432) 302-8761 to confirm what is in stock for your specific roof.
Call for a Free Estimate
If your addition roof is leaking, your ADU smells musty after rain, or you are planning a new build and want straight numbers before you commit, call Mason Remodeling Co Dallas at (432) 302-8761. A live person answers, 24 hours a day, 7 days a week. You will get a written price, a schedule, and a name and photo of who is coming to your door before the work starts. That is the Threshold Standard, and we have held to it since 2004.
Written by Isaac Pruett, Owner, Mason Remodeling Co Dallas at Mason Remodeling Co Dallas, serving Dallas and nearby areas.
