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CertainTeed Home Additions & ADU: The Pasadena Owner’s Guide
We handle CertainTeed material integration for home additions and ADUs in Pasadena, with typical full-project costs landing between $45,000 and $130,000 depending on scope, foundation work, and finish level. Most owners reach out because a previous addition used CertainTeed siding, roofing, or insulation that’s now failing, or they’re planning an ADU and want the same CertainTeed exterior package matched to their main house. In Pasadena’s dry heat and occasional heavy rain, CertainTeed siding and roofing hold up well when installed right, but bad flashing or skipped housewrap shows up within a few years as water stains, warped boards, or drywall cracks inside the room.
Which CertainTeed Models This Applies To
CertainTeed doesn’t make a single “addition system,” so the parts question usually comes down to which product line is on your existing house. For siding, that’s typically CertainTeed Cedar Impressions (individual shingle look), Monogram (horizontal lap), or Board & Batten (vertical groove). Roofing that needs matching during an addition is usually Landmark architectural shingles or Presidential Shake if the house has a heavier profile. For insulation in an ADU, it’s CertainTeed InsulSafe or Optima blown-in, or R-13/R-19 kraft-faced batts in standard 2×4 or 2×6 walls.
The compatibility gotcha we see most in Pasadena: Cedar Impressions from even five years ago won’t color-match a new box perfectly, because UV fade shifts the pigment. If you’re adding a room and want the siding to blend, we either pull a sample from an inconspicuous spot and order a custom match, or we recommend re-siding the visible elevation entirely. Aftermarket equivalents exist for CertainTeed trim and flashing, but for the siding and shingle products themselves, we stick with OEM. The warranty math doesn’t work otherwise, and CertainTeed’s transferable coverage only applies when the product is what it says on the label.
Styles & brands we work with
Signs Your CertainTeed Home Additions & ADU Is Failing
- Water staining at the addition’s ceiling corners. This almost always traces back to failed flashing where the new roof ties into the old one. CertainTeed shingles rarely fail first; the transition detail does.
- Siding that’s soft or spongy when pressed. Cedar Impressions and lap siding trap moisture when the housewrap behind them was installed backward or taped poorly. By the time it feels soft, the sheathing underneath is usually wet too.
- Gaps opening where the addition meets the main house. Different foundation settlement rates pull the joint apart. You’ll see a vertical crack running through the drywall or a visible gap in the siding corner.
- Insulation that’s settled or damp in the ADU ceiling. Blown-in CertainTeed will settle over time, losing R-value. If the roof leaked even once, that insulation is now doing almost nothing and should come out.
- Musty smell or elevated indoor humidity in the addition. The CertainTeed products aren’t the cause. The cause is usually a missing vapor barrier or bad crawlspace ventilation beneath the addition, and the fix starts with opening the envelope.
See the difference
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AfterReplacement Cost & What’s Included
For a Pasadena home addition using CertainTeed products, the full project range is $45,000 to $130,000. A detached ADU with CertainTeed siding, Landmark shingles, and batt insulation typically runs $90,000 to $220,000, with the spread driven by foundation type (raised vs slab), kitchen and bath count, and whether the ADU ties into existing sewer or needs its own lateral. If you’re only replacing failed CertainTeed siding on an existing addition, that work lands in the siding repair range, usually $3,500 to $9,000 depending on elevation size and how much sheathing needs replacing.
Every quote is a written line-item price before any work starts. That number includes materials, labor, disposal, permit coordination, and the 365-Day Done Right Promise. If something’s not right within a year of project close, we fix it. No change orders, no surprise line items at invoice.
DIY or Call Us?
For siding and insulation, there are jobs a careful homeowner can do: replacing one cracked CertainTeed lap board, re-caulking a trim joint, or adding batt insulation in an open wall. Those are safe, if tedious. For roof transitions on an addition, structural framing, or anything involving a gas line or electrical panel for an ADU, you want a trained contractor. A bad roof tie-in leaks into the one part of your house you just paid to build, and fixing it after drywall is up costs triple. Pasadena also enforces title 24 energy requirements on new ADUs, and the compliance paperwork is not optional. If you’re unsure whether the failure is cosmetic or structural, call us at (626) 657-5396. We’ll tell you honestly what needs doing and what can wait.
FAQs
CertainTeed siding can go 30 to 50 years in Pasadena’s climate, and Landmark architectural shingles typically last 25 to 30 years, though our sun and heat mean the south and west elevations age faster than the north. The products hold up; the install details fail first. Call (626) 657-5396 and we’ll inspect the specific failure point before you replace anything.
Individual boards or shingle panels can be replaced if the damage is localized and the color match is close enough for you. If the failure is widespread or the housewrap behind it failed, full re-siding is the honest fix. We’ll show you what’s behind the wall before you spend a dollar, and every estimate is free.
A detached ADU in Pasadena runs four to eight months from permit to final inspection, and a full home addition typically runs three to six months. The timeline depends on plan check with the city, foundation work, and how much of the existing house you’re tying into. We give you a written schedule before work starts and photo updates throughout.
We keep common CertainTeed trim, flashing, and siding accessories in our Pasadena stock, and we order the specific siding and shingle profiles per job so the product batch and color match are as close as possible. We also work with KraftMaid, Cambria, and Silestone products when interior finishes need to match what’s already in the home. Call (626) 657-5396 to schedule your free estimate.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Pasadena at Sawyer Remodel Pasadena, serving Pasadena and nearby areas.
