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Tamko Home Additions & ADU: The Santa Clarita Owner’s Guide
Home additions and ADU projects in Santa Clarita using Tamko roofing and waterproofing products typically run $45,000 to $130,000 installed, depending on square footage, foundation work, and finish level. Most homeowners call us after they notice water staining on a ceiling, cracking drywall at a wall-to-addition seam, or shingle granule loss in gutters on a newer build. You’re looking for someone who knows how Tamko materials behave in Santa Clarita’s dry heat and occasional heavy downpours, and whether the issue is the Tamko product or the framing and flashing around it. We’ll give you a straight answer and a written price before any work starts.
Which Tamko Models This Applies To
Tamko’s roofing lines show up on a lot of Santa Clarita additions and ADUs because builders spec them for their price-to-warranty ratio. The main lines we work around are Heritage shingles (common on pitched additions), MetalWorks steel shingle systems, and Tamko’s underlayment and ice-and-water shield products that go under tile or composition roofs. Most failures we see on additions aren’t the Tamko shingle itself failing early. It’s the transition flashing where a new addition ties into the existing roofline, or the valley where two planes meet on an ADU over a garage.
If you’re trying to identify what you have, look for the Tamko brand marking on the shingle’s underside or the packaging left in a crawl space or garage. Take a photo of the shingle edge profile and measure the exposure. Heritage runs a standard 5-5/8 inch exposure, and that measurement matters when patching. For MetalWorks, check whether you have the 12-inch or 16-inch panel width because replacement panels aren’t interchangeable across widths. We can match the product, but the honest truth is this: on most additions and ADUs, the Tamko material is only as good as the flashing and underlayment installed around it. That’s where the leaks start.
Styles & brands we work with
Signs Your Tamko Home Additions & ADU Is Failing
- Water staining on the addition’s ceiling corners. This usually means the step flashing where the addition roof meets the main house wall has pulled away or was never installed with enough overlap. Santa Clarita’s summer heat cycles cause the metal to expand and contract, and over a few years, the sealant dries and cracks.
- Granules piling up in gutters or at downspout elbows. Tamko shingles shed granules as they age, but heavy accumulation within the first five years points to a manufacturing defect or improper storage before install. Either way, the shingle’s UV protection layer is gone and the mat underneath will dry out fast in our sun.
- Drywall cracks at the seam where the addition meets the original house. This is typically a foundation or framing settlement issue, not a Tamko product failure. But it opens the door for water intrusion at the roof line and makes any flashing shift. It’s worth checking both the structure and the roofing at the same time.
- Curling or cupping shingles on the south-facing slope. The relentless sun exposure on the south and west sides of Santa Clarita homes ages roofs faster than the north slopes. If only one plane is curling, it’s UV and heat, not a leak. If it’s across the whole roof, look at ventilation.
- Musty odor inside the ADU after rain. That’s moisture trapped in the wall cavity or under the roof deck. By the time you smell it, you’ve had water penetrating for a while. The fix usually involves opening the wall, replacing the sheathing, and re-flashing the roof-to-wall connection.
See the difference
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AfterReplacement Cost & What’s Included
In Santa Clarita, a full roof replacement on a home addition or ADU runs $8,000 to $20,000, while the addition structure itself falls in the $45,000 to $130,000 range and an ADU build lands at $90,000 to $220,000. Most of the jobs we see involving Tamko products on additions and ADUs are roof repairs or re-flashing jobs at $400 to $1,800, not full replacements. Here’s what drives the number when we quote:
- Scope of the failure: A single flashing repair is a few hundred dollars. Replacing an entire roof plane on an ADU is thousands.
- Access and pitch: A steep-pitch addition roof in Valencia means more safety rigging and slower labor. A low-slope garage ADU in Canyon Country is faster and cheaper.
- Material match: Matching discontinued Tamko colors can mean a full plane replacement instead of a patch. We’ll tell you if a patch will be visible and let you decide.
- Underlayment and decking: If water got past the Tamko layer, we may need to replace roof decking. That’s a separate line item on your written quote, never a surprise add-on.
Every roofing and addition job we do in Santa Clarita includes the 365-Day Done Right Promise: if it’s not done right, we make it right. The price is in writing before we start, and it doesn’t change at the invoice. We don’t play the low-ball-then-upcharge game.
DIY or Call Us?
You can safely check a few things yourself: look for obvious granule loss in gutters, check for visible flashing gaps with binoculars from the ground, and note any ceiling stains inside the addition. What you shouldn’t do is get on a roof, especially a two-story addition roof on a Valencia hillside lot. Falls from roofs are one of the most common and most serious home injury causes, and any roof work on a steep pitch or two-story structure should be handled by someone with safety training and proper rigging. Same goes for removing and re-flashing a wall-to-roof connection. One wrong move up there creates a bigger leak than you started with.
If you want a set of trained eyes on it, call us at (661) 592-1977. We’ll inspect the addition or ADU, give you an honest assessment of the Tamko product and the install around it, and hand you a written quote. If it’s something you can handle with a tube of sealant, we’ll tell you that too.
FAQs
A properly installed Tamko Heritage roof in Santa Clarita typically lasts 18 to 25 years, but our sun exposure on south and west slopes can cut that to 15 to 20 years if attic ventilation isn’t adequate. MetalWorks systems last longer, usually 30 years or more with proper maintenance. Call (661) 592-1977 if you want us to assess what you have.
Yes, isolated flashing failures, small shingle damage, and localized leaks can usually be repaired for $400 to $1,800 in Santa Clarita. If the shingles are at the end of their service life or the decking is compromised, repair becomes a band-aid and replacement is the honest recommendation. We’ll show you photos of what we find before recommending anything.
A flashing repair or small shingle patch takes a day or less. A full roof replacement on an ADU or addition takes 2 to 5 days depending on size, pitch, and whether we need to replace decking. Luca Romano schedules the crew and we give you a live arrival time so you’re not stuck in a four-hour window.
We stock common Tamko shingle colors and flashing materials on our trucks, but specific color matches and MetalWorks panels are ordered per job to ensure the right match. We also work with KraftMaid, Cambria, and Silestone on the interior side of additions and ADUs, so the whole project can be handled by one accountable crew with one written price. Call (661) 592-1977 and we’ll check availability for your specific Tamko product.
Written by Luca Romano, Owner, Sawyer Remodel Santa Clarita at Sawyer Remodel Santa Clarita, serving Santa Clarita and nearby areas.
