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Tamko Home Additions & ADU: The Fresno Owner’s Guide
Tamko home additions and ADU construction in Fresno typically runs $45,000 – $130,000 installed, depending on square footage, foundation work, and whether you’re building up or out. That’s the number we put in writing before the first tool comes out, and it’s the number that stays on the final invoice. Most Fresno homeowners discover they need this work when a room stops functioning the way it used to: a converted garage that’s freezing in July, a permitted sunroom with a roof that’s finally given up, or an in-law suite that the last contractor never actually finished to code.
We stock and install Tamko-compatible roofing, decking, and underlayment materials for additions and ADU builds across Fresno. Bradford Remodeling Co Fresno is an independent contractor, not affiliated with Tamko, but we run their products on our builds because the specs are consistent and the warranties hold up in Central Valley heat.
Key takeaways:
- Installed cost for a Tamko home addition or ADU in Fresno: $45,000 – $130,000.
- We use Tamko roofing and decking on our addition and ADU projects by specification, not guesswork.
- Written price before any work starts. No numbers that move at the door.
- 365-Day Done Right Promise on every completed project.
- A live person answers our phone 24/7 at (559) 785-2712.
Which Tamko Models This Applies To
Tamko’s product line for additions and ADUs centers on their roofing systems: Heritage shingles, MetalWorks steel roofing, and their proprietary decking and underlayment boards. The compatibility question that trips up Fresno homeowners is almost always about shingle match. If your original house has Heritage shingles in a color that’s been discontinued or reformulated, slapping a different Tamko line on the addition means the roofline will never look right. We check the shingle code on the back of an existing tab or pull the original materials list before we spec anything.
For ADU projects, the real gotcha is roof pitch and ventilation. Tamko’s warranty language on steep-slope versus low-slope applications is specific, and a Fresno ADU with a shallow roof pitch needs a different underlayment assembly than a standard 6:12 main house. We’ve corrected plenty of earlier work where a handyman used the wrong Tamko underlayment for a low-slope addition and the sheathing rotted out within five years. When you’re choosing between OEM Tamko and aftermarket equivalents, the OEM product is the safer call for roofing and decking because the warranty chain stays intact. For framing lumber, fasteners, and interior work, quality aftermarket is fine, and we’ll tell you exactly what we’re putting in and why.
Styles & brands we work with
Signs Your Tamko Home Additions & ADU Is Failing
- Shingle granule accumulation in gutters. That grit at the downspout means the shingle’s mineral coating is degrading. In Fresno, UV exposure and 100-degree summer days accelerate this. If you’re seeing granules, the roof on that addition has lost part of its protective layer.
- Visible sags between rafters. This usually means the decking underneath the Tamko shingles has absorbed moisture and lost structural integrity. It’s the part you don’t see that fails first. By the time the sag shows from the outside, the decking is already compromised.
- Water staining on interior ceilings or walls of the addition. The leak isn’t always directly above the stain. Water travels along rafters and underlayment before it drops. We trace it back to the actual breach, which is often a failed flashing point where the addition ties into the original roofline.
- Exposed nail heads that lift or pop. When the decking expands and contracts through Fresno’s hot-cold cycles, nails back out. A popped nail head creates a water entry point, and a few of them mean the roof assembly on that addition is working against itself.
- Curling shingle edges on the addition but not the main house. This tells us the addition’s roof ventilation is wrong. Heat builds up in the attic cavity, cooks the shingles from underneath, and the edges curl. The main house ventilates fine, so it looks normal. The addition doesn’t, so it doesn’t.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
Here’s the breakdown for Fresno:
| Scope | Typical Range |
|---|---|
| Full home addition (bedroom/bath, 400 – 800 sq ft) | $45,000 – $130,000 |
| ADU construction (new build, 600 – 1,200 sq ft) | $90,000 – $220,000 |
| Garage conversion (existing structure) | $30,000 – $80,000 |
| Roof replacement on an existing addition (Tamko shingles redecked) | $8,000 – $20,000 |
| Roof repair on an addition (flashing, decking patch) | $400 – $1,800 |
The spread comes down to square footage, foundation condition, and whether we need to bring electrical or plumbing up to current Fresno code. Every bid includes the written price, the material list with Tamko products identified by line and color, and the start-to-finish scope. No change orders unless you change the scope yourself. The work carries the 365-Day Done Right Promise: if the addition or ADU fails inside that first year, Bradford returns and corrects it free of charge.
DIY or Call Us?
If you’re in Fresno and your Tamko addition is showing granule loss or minor flashing rust, you can safely clean the gutters and take photos to send us for a read. That’s about where it ends. Replacing roof decking, re-flashing a valley, or rebuilding a failed addition wall means working at height, pulling and resetting structural fasteners, and matching Tamko materials to existing warranty specs. The wrong underlayment placed by a well-meaning weekend project becomes a mold problem inside two wet winters. We’ve torn out enough of those to say it plain: call a crew that does this full-time. Curtis Lane and our Bradford Remodeling Co Fresno team have been running square rough-in and clean subfloor prep across this valley for over two decades. The estimate says what we build, and we build what the estimate says. Call (559) 785-2712 and we’ll put it in writing.
FAQs
A Tamko architectural shingle roof, properly ventilated and installed on solid decking, lasts 20 – 30 years in Fresno. The Central Valley’s heat and UV will usually shorten that toward the 20 – 25 year end. The failure we see most is not the shingle itself but poor decking prep or bad flashing from the original install. Call (559) 785-2712 for an inspection and a written quote on replacement or repair.
Yes, in most cases. If the framing is sound, we can redeck, re-flash, and re-shingle the roof, which runs roughly $8,000 – $20,000 depending on the roof’s square footage. Full rebuilds are only necessary when the structure underneath has rotted or the addition was never built to code. We’ll tell you straight which one you’re looking at before you spend a dollar.
A permitted room addition typically runs 3 – 5 months from the first inspection to final walk-through. An ADU runs 5 – 9 months depending on site prep and utility connections. We set the schedule in the written estimate and keep it updated as inspections pass. You’ll know where your project stands every week.
We keep common Tamko shingles, underlayment, and flashing stock on hand for repair work, and we order full roofing packages per project so the color lots match. We also install KraftMaid, Cambria, and Silestone materials for interior work on additions and ADUs, so the whole project runs through one written scope and one guarantee. Call (559) 785-2712 for a free estimate.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fresno at Bradford Remodeling Co Fresno, serving Fresno and nearby areas.
