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Boral Home Additions & ADU: The Pasadena Owner’s Guide
A home addition or ADU project in Pasadena typically runs $45,000 to $130,000 for the full build, and if you’re planning around Boral materials (brick, stone, or roofing), the planning phase is where you save the most money. Most people call us after their existing Boral siding or Boral roof has started to fail and they want to know whether to repair or fold that cost into a larger addition. The short answer: if you’re already spending on a Boral fix, it’s worth pricing the addition now, because mobilizing a crew for both jobs costs less than running them separately.
We’re Sawyer Remodel Pasadena, led by Luca Romano. We’re an independent remodeling contractor, not affiliated with Boral. What we do is build additions and ADUs that play nicely with the Boral products already on your house, and we stock or can source the parts that keep those materials performing.
Which Boral Models This Applies To
Boral makes a few different product lines that show up on Pasadena homes, and the compatibility question depends entirely on which one you have. The big three we deal with are Boral TruExterior siding and trim, Boral cultured stone (now part of Westlake Royal Stone Solutions), and Boral roof tiles (primarily concrete barrel and flat profile). Each has its own fastening specs and each fails differently.
For TruExterior, the tell is the edge profile. The original smooth-finish boards were 3/4″ thick and sold in 16′ lengths. If your house was built or re-sided after about 2010 in neighborhoods like Bungalow Heaven or Madison Heights, and the trim is smooth with no lap marks, you’re likely looking at TruExterior. The poly-ash formulation means it does not act like wood. You can’t just grab a cedar board and nail it up next to it, the expansion rate and fastener-holding is different. For stone, the pattern name is usually stamped on the back of the stone or on the box tongue, names like Cobblefield, Nantucket, or Versetta. For roof tile, Boral concrete tile has a specific interlocking profile that most generic replacements do not match, and mixing a different manufacturer’s tile into a Boral roof is how you get leak lines that run diagonally across the roof deck.
The honest advice: for additions and ADUs where you want the new structure to visually and physically match the old, source the exact OEM product. For standalone structures where matching isn’t the goal, a quality aftermarket equivalent can save 15 to 30 percent on material without sacrificing the build’s integrity. We’ll walk you through which situation you’re in before we quote anything.
Styles & brands we work with
Signs Your Boral Home Additions & ADU Material Is Failing
- Gaps at trim joints. Poly-ash trim expands and contracts more than wood. If the original installer butted joints tight without a flexible sealant, you’ll see hairline cracks at every seam. Water gets in, freezes in the rare Pasadena cold snap, and the gap widens.
- Hollow-sounding stone or a “drummy” knock. When you tap a cultured stone and hear a hollow thud instead of a solid one, the mortar bed has delaminated from the scratch coat. In Pasadena’s dry heat, improper curing is the usual cause, and once one stone goes, its neighbors follow.
- Tile color fading to chalk on one elevation. Concrete roof tiles on south and west-facing slopes bleach fast under our sun. Fading alone isn’t a leak risk, but surface erosion that exposes the aggregate is the first step toward tile cracking.
- Efflorescence on the stone veneer. That white powdery film is salts leaching out. It means water is moving through the wall from behind, not drying on the surface. On older Pasadena homes with no rain screen, this is the warning that the water management layer is failing.
- Cracked corner pieces on window surrounds. TruExterior corner boards take the most stress from fasteners and any wall movement. A cracked corner board is almost never isolated, it usually signals a waterproofing failure at the window head that has been wicking for years.
See the difference
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AfterReplacement Cost & What’s Included
For a standalone Boral material repair on a Pasadena home, you’re usually looking at $400 to $4,000 depending on scope. For a home addition or ADU build that includes matching Boral materials, the full project runs $45,000 to $130,000, and an ADU specifically lands between $90,000 and $220,000 when you’re building from foundation to finish. The gap between those numbers is driven by four things: foundation work (older Pasadena lots often have expansive soil that needs deeper footings), utility runs (a detached ADU needs its own sewer and electrical run, and the distance from the main line sets the cost), the material volume you’re matching (stone is labor-heavy to install), and whether your existing foundation has to be tied into or the new structure stays separate.
Every quote we write in Pasadena includes the material, the labor, the fasteners, the flashing, the finish work, and disposal. The number on the written price is the number on the invoice. The 365-Day Done Right Promise covers the work for a full year after close: if something wasn’t done right, we come back and fix it. No arguments, no invoice.
DIY or Call Us?
You can safely do the detective work yourself. Check if your stone is delaminating with the knuckle-tap test. Look at your trim joints on a cold morning when gaps are at their widest. Check your roof tile for surface erosion by running a hand over the tiles on a dry afternoon and looking for sandy residue. Those checks tell us a lot before we even arrive.
What you shouldn’t do is pull off a piece of failing trim or stone to “look behind it.” Once you open the wall, you’ve changed the watershed, and a temporary tarp job on a Pasadena roofline during our winter rain can turn a $900 trim fix into a $9,000 water damage claim. As for the actual work, if it involves flashing or tie-in to an existing structure, that’s where DIY builds go sideways. Water doesn’t care about your weekend timeline. Call us at (626) 657-5396 and we’ll give you a written price before any work starts.
FAQs
TruExterior carries a 50-year limited warranty, but in our Pasadena climate we realistically see 30 to 40 years of service before joint sealant failure starts showing up on the hottest west-facing walls. The material itself holds up, the caulking and paint do not. Plan on re-caulking and repainting every 8 to 12 years. Call us at (626) 657-5396 for an exact material assessment.
Yes, if the failure is caught early and limited to a few stones, we grind out the old mortar, re-set the stones with a polymer-modified thinset, and re-point the joints. If the delamination is widespread across a wall, partial repair becomes a losing game and replacement is the honest answer. We’ll tell you which one you’re in before quoting.
A trim and siding section replacement typically takes two to four working days. A full stone veneer re-clad runs one to two weeks. A complete addition or ADU with Boral materials is a three to six month project depending on permitting, which in Pasadena typically takes 6 to 10 weeks for an ADU. The written quote includes a schedule, not just a price.
We keep common TruExterior trim profiles and fasteners in our inventory because the smooth-finish 3/4″ profile is a stock item for us across Pasadena. Stone patterns and concrete tile are ordered per-project because color lots vary and you do not want a mismatched lot on a visible wall. Order time is usually 5 to 10 business days.
If you’re planning a home addition or ADU in Pasadena and you want a crew that knows how Boral materials behave on a real California house, call (626) 657-5396. We’ll walk the property, give you a written price, and tell you straight what needs doing and what doesn’t. Luca Romano has been working on Pasadena homes long enough to know that the work tells you everything, you just have to know how to listen to it.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Pasadena at Sawyer Remodel Pasadena, serving Pasadena and nearby areas.
