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CertainTeed Home Additions & ADU: The Woodland Hills Owner’s Guide
If you’re planning a home addition or ADU in Woodland Hills that uses CertainTeed roofing, siding, or insulation, a complete build typically runs $45,000 to $130,000 installed, depending on square footage, foundation work, and finish level. We install and integrate CertainTeed products into additions and ADUs throughout Woodland Hills, and we’ll itemize every material line before work starts. Most owners come to us mid-planning because they’ve discovered their original contractor quoted “roofing” without specifying whether it was CertainTeed Landmark, Presidential, or a builder-grade substitute they’d never choose themselves.
The part-grade question matters more than most people expect. CertainTeed makes dozens of product lines, and the difference between a Landmark shingle and a Presidential shake is not just looks. It’s thickness, wind rating, and how it holds up in Woodland Hills summer heat cycles. When we spec an addition or ADU, we name the exact CertainTeed product on the written quote. No “roofing, assorted.” No substitutions you find out about after tear-off.
Which CertainTeed Models This Applies To
For Woodland Hills additions and ADUs, the CertainTeed products that actually matter fall into three buckets: roofing, siding, and insulation. On the roofing side, the most common lines we install are CertainTeed Landmark (asphalt, an entry architectural shingle), Landmark Pro (heavier, better wind rating), and Presidential Shake (a dimensional shake look with serious thickness). If your addition calls for a flat or low-slope section, CertainTeed Flintlastic SA cap sheets are the standard we use. You’ll find the brand and line printed on the shingle wrapper or on the product label under the cap sheet.
One compatibility gotcha Woodland Hills owners should know: CertainTeed warranties are system warranties. That means the underlayment, ice and water shield, and shingles should all be CertainTeed products if you want the full manufacturer-backed coverage. Mixing brands voids the system warranty even if the shingles themselves are CertainTeed. We specify the full system on every roof we install, because a partial warranty is almost as bad as none.
For siding, CertainTeed’s Cedar Impressions and Monogram lines are common on ADUs where owners want a wood look without repainting every few years. These are measured by panel profile and exposure, and the color codes are specific. If you’re matching an existing main house, bring us the original color code from the siding purchase or we’ll pull a sample and match it. Guessing at siding color from a phone photo across the yard is how you end up with a two-tone ADU.
Styles & brands we work with
Signs Your CertainTeed Home Additions & ADU Material Is Failing
- Granule loss in the gutters. If you’re finding dark sand-like granules in your Woodland Hills gutters after a Santa Ana wind event, the shingle surface is breaking down. Some granule shed is normal in year one; heavy loss after year seven means the asphalt is oxidizing faster than it should.
- Brittle or curled shingle edges. Woodland Hills heat plus direct western exposure will age a shingle faster than a shaded roof in the Valley. Curled corners mean the shingle has lost flexibility and is closer to cracking than repairing.
- Water staining on ADU ceiling drywall. This is the one everyone catches late. By the time you see a stain inside, water has already worked through the shingle, underlayment, and decking. The repair is never just a shingle swap.
- Siding panels that rattle in wind or show gaps at seams. CertainTeed polymer siding expands and contracts with temperature. If panels were nailed too tight during install, they’ll buckle or pull at the seams. Woodland Hills swings of 40+ degrees between night and afternoon make this a real installer-skill issue.
- Insulation that settles or leaves cold spots. If a corner of your ADU is always colder in January, the batt or blown-in insulation wasn’t installed to the recommended R-value, or it settled. CertainTeed insulation has specific R-value per inch, and cutting that corner is invisible until your power bill arrives.
See the difference
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AfterReplacement Cost & What’s Included
A full home addition or ADU in Woodland Hills lands between $45,000 and $130,000, and the CertainTeed material line is one of the few places where spending slightly more upfront saves real money over ten years. A Landmark Pro roof on a 400-square-foot ADU might add $600 to $1,200 over builder-grade shingles, but it buys an extra decade of life and a wind rating that matters when the Santa Anas hit 60 mph.
Every quote from us includes the full CertainTeed system, removal and disposal of old material, decking inspection and repair if needed, flashing, and a written line-item price before work starts. We pull permits for additions and ADUs in Los Angeles County, and we don’t pass inspection surprises back to you as change orders. The price on the quote is the price on the invoice. The 365-Day Done Right Promise covers the workmanship for a full year after close, and if a repair fails within that window, the second visit is free.
For exact pricing on your Woodland Hills addition or ADU, call (341) 217-2776 and we’ll walk the site and write the number down.
DIY or Call Us?
You can safely do the planning homework: identify your CertainTeed shingle line from the original packaging, note your roofline square footage from county assessor records, and check whether your existing roof has a system warranty still in effect. What you shouldn’t do is get on a roof yourself to inspect a failing deck, retie flashing, or pull up shingles to check underlayment. Woodland Hills roofs get hot, steep, and slick, and a fall is not worth the $300 inspection fee.
We see DIY ADU weatherproofing go sideways when owners patch a roof leak from below with spray sealant and call it fixed. Water doesn’t care about your effort. It follows the sheathing, and the damage keeps spreading while the surface looks dry. If you suspect a material failure in your addition or ADU, call (341) 217-2776 and we’ll take a look. The estimate is free, and you’ll know the exact number before you decide anything.
FAQs
A properly installed CertainTeed Landmark roof lasts 25 to 30 years in Woodland Hills, while Presidential Shake can go 30 to 40 years if the ventilation is right and the decking stays dry. CertainTeed polymer siding lasts effectively the life of the structure, though color fading is more aggressive on south-facing walls in our climate. If you’re planning a 30-year stay in the home, invest in the heavier material now. Call (341) 217-2776 and we’ll price both options so you can decide with real numbers.
Yes, for minor failures like isolated shingle damage or a single loose siding panel, a repair is straightforward and costs a few hundred dollars. If the failure is systemic, meaning granule loss across the roof or multiple buckling siding panels, patching it piecemeal just spreads the cost out while the underlying problem grows. We’ll tell you which situation you’re in after an inspection. Estimates are free at (341) 217-2776.
Roofing on a typical ADU takes two to four days once materials are on site. Siding runs a week to ten days depending on the profile and whether you’re matching an existing structure. Insulation installation is usually a single day. The full addition or ADU build, from foundation to final inspection, typically runs four to eight months in Woodland Hills, with the CertainTeed work slotted into the final third of the schedule. Call (341) 217-2776 for a project timeline specific to your lot and scope.
We order CertainTeed products per project so you get the exact color, profile, and line you approved, not whatever was left on a warehouse shelf. Standard Landmark colors are usually available within a week in the Los Angeles market. Specialty Presidential colors or less common siding profiles can take three to four weeks. We also install materials from KraftMaid, Cambria, and Silestone on interior buildouts so your finishes match the exterior quality. Call (341) 217-2776 and we’ll confirm current lead times for the specific CertainTeed product you’re considering.
Written by Luca Romano, Owner, Sawyer Remodel Woodland Hills at Sawyer Remodel Woodland Hills, serving Woodland Hills and nearby areas.
