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Boral Home Additions & ADU: The Woodland Hills Owner’s Guide
A Boral home addition or ADU project in Woodland Hills typically runs $45,000 – $130,000 installed, depending on square footage, foundation work, and finish level. We stock and install Boral-compatible structural materials, trim, and siding systems, and we can usually start the design-and-bid phase within a week of your call. Most Woodland Hills homeowners discover they need Boral-specific replacement materials when a section of exterior trim fails, a siding panel warps or cracks after a heavy rain year, or an addition built in the early 2000s starts showing gaps where the Boral product meets the original roofline.
Which Boral Models This Applies To
Most Woodland Hills home additions and ADUs built in the last two decades use one of three Boral product families: Boral TruExterior trim, Boral Versetta Stone (a stone-faced siding panel), and Boral siding profiles that match traditional lap or shingle designs. The material you need depends on what’s failing and what your original builder specified. TruExterior trim comes in standard 1x dimensions (1×4 through 1×12) and is identified by its smooth, paintable face and its fly-ash-and-polymer composition, which feels denser than cedar or PVC. Versetta Stone panels are mortarless, interlocking, and typically measure 8″ tall with color names like Sierra, Tavern, or Chiseled. Before calling us, check the back of any removed piece or the inside face of a trim board; Boral embeds a product code beginning with “TXP” or “VS”. If you can’t find it, our crew will match it during the free estimate.
One compatibility gotcha we see regularly in Woodland Hills: older additions from the 1990s sometimes used Boral’s now-discontinued trim lines that don’t cross-reference cleanly to today’s TruExterior profiles. In those cases, we mill the replacement to match onsite rather than forcing a mismatched width into a 30-year-old reveal. We also stock quality aftermarket equivalents for common profiles where the Boral piece is on backorder or discontinued, but we talk through the material difference before any purchase happens.
Styles & brands we work with
Signs Your Boral Home Additions & ADU Is Failing
Boral materials hold up better than wood in Southern California, but they’re not indestructible. Here’s what Woodland Hills homeowners actually tell us, and what it means behind the wall:
- Caulk lines at trim joints keep splitting open. This usually means the original installer nailed the trim without leaving enough expansion gap. Boral trim moves with temperature swings, and Woodland Hills swings hard from 50-degree winter mornings to 105-degree August afternoons. The fix is removing the trim, re-securing with proper fasteners, and using a flexible sealant rated for polymer trim.
- Paint peeling on Boral siding within 3 – 5 years of a repaint. Boral products don’t rot, but they do need the right primer. If a previous painter skipped the manufacturer-specified bonding primer, the paint film fails in sheets. We strip, prime, and repaint correctly.
- Versetta Stone panels lifting at the base of an ADU wall. Almost always a grading or drainage issue where irrigation water pools against the panel. The panels are fine; the soil isn’t. We correct the drainage path and reset the lower courses.
- Water staining under exterior window sills on a Boral-addition. The sill flashing was never lapped correctly over the Boral trim. We remove the sill, install proper flashing, and reseal. The trim itself rarely needs full replacement.
- Cracks at inside corners of a Boral-trimmed addition where it meets the original house. The addition’s framing is settling at a different rate than the main structure. We inspect for structural issues first, then re-trim the joint to absorb the movement.
See the difference
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AfterReplacement Cost & What’s Included
In Woodland Hills, a Boral-specific repair or replacement as part of a larger home addition or ADU project runs $45,000 – $130,000 fully installed. Smaller scope work, like replacing a section of failed Boral trim or re-siding one wall of an existing ADU, typically lands in the $4,000 – $15,000 range depending on access, height, and paint work. What drives the bigger number: foundation condition, how much of the original structure is still sound, whether permits are already on file, and which Boral product line you’re matching. Every quote from Mason Remodeling Co Woodland Hills includes parts, labor, haul-off, and paint or finish work written as a line item. You get a written price before we start, never a verbal range that grows. The work is covered by our 365-Day Done Right Promise: if something isn’t right within a year of completion, we make it right at no cost to you.
DIY or Call Us?
Some things you can safely check without touching a tool. Walk the perimeter of your Woodland Hills addition or ADU and look for visible gaps, peeling paint, or panels that don’t sit flat. Note where water pools after rain. Taking those notes before you call saves everyone time. Replacing Boral trim, siding, or stone panels yourself, though, usually goes wrong for one reason: removal without damaging the weather barrier underneath. That barrier is what keeps a Woodland Hills dry season from turning your wall cavity into a mold problem the next time a winter storm rolls through. If you’re already seeing water stains or gaps you can fit a quarter into, call us before opening anything up. Isaac Pruett and our crew have been doing this work in the Valley long enough to know that the part you can see is usually only half the job. Call (831) 290-6866 and we’ll schedule a free estimate.
FAQs
Boral trim and siding carry a 25-year manufacturer warranty against rot and insect damage, and in Woodland Hills the material itself routinely lasts 30 – 40 years with proper paint maintenance. The weak points are sealant joints and fasteners, not the boards. Expect to reseal expansion joints every 5 – 7 years. Call (831) 290-6866 if you’re seeing joint failure earlier than that, and we’ll inspect the installation.
Yes, if the panel or trim board is still mechanically sound. Paint failure, minor surface cracks, and lifted panels can often be corrected with the right prep, primer, and refastening. When the material itself has cracked through or a panel has pulled free of its substrate, replacement is the honest call. We’ll tell you which one you need, and our estimate is free either way.
A typical trim replacement on one elevation takes one to two days. Re-siding a full ADU usually runs three to five working days, including paint. Larger addition work that involves framing, foundation, and permits follows a schedule we lay out in writing before any work starts, and we don’t change it without your sign-off.
We keep common TruExterior trim profiles and Versetta Stone panels from the most-requested color lines on hand, and we have direct access to Boral distribution for everything else. If you need a discontinued profile matched, we’ll mill it and tell you the price difference before ordering. We also stock compatible products from KraftMaid, Cambria, and Silestone for the interior side of the project, so you don’t have to coordinate three suppliers.
Written by Isaac Pruett, Owner, Mason Remodeling Co – Woodland Hills, CA at Mason Remodeling Co Woodland Hills, serving Woodland Hills and nearby areas.
