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American Standard Home Additions & ADU: The Woodland Hills Owner’s Guide
If you’re researching an American Standard home addition or ADU in Woodland Hills, the honest answer is this: full additions run $45,000 – $130,000, ADU construction starts around $90,000 and can reach $220,000, and neither is a one-week job. Most homeowners find this page because a previous addition has failed in some way, or because a planned ADU needs a contractor who understands American Standard fixture and material compatibility before the first wall goes up. What usually brings people to us is a failing roofline tie-in, an undersized foundation pour, or a permit complication that should have been caught years earlier.
We’re Mason Remodeling Co Woodland Hills, an independent home services company. We are not affiliated with American Standard, but we work with their products and specifications every week.
Which American Standard Models This Applies To
American Standard doesn’t manufacture framing or foundation systems, but their product line does dictate how additions and ADUs come together. The compatibility questions we see most often involve American Standard plumbing fixture rough-in dimensions, water heater venting requirements, and shower pan heights, all of which affect subfloor framing and wall placement. If your addition includes a bath, the rough-in for an American Standard Cadet or Studio toilet is 12 inches from the finished wall, and the supply stub-out needs to sit 8 inches left of center. Get that wrong and you’re opening walls.
For ADU kitchens, American Standard’s kitchen faucet lines pair with standard 8-inch spread or single-hole configurations, but the deck plate thickness changes clearances for backsplash installs. We verify those specs against your plans before we pour. A quality aftermarket integration is often fine for trim and finish work, but for American Standard-specific flanges, gaskets, and mounting hardware, we recommend OEM every time. The aftermarket flange kits we’ve pulled off Woodland Hills jobs too often use thinner gasket material that fails within two years.
Styles & brands we work with
Signs Your American Standard Home Additions & ADU Is Failing
- Drywall cracks radiating from window and door corners. This almost always means foundation settlement or improper header sizing. In Woodland Hills’s expansive clay soils, we see this more in summer when the ground shrinks and the framing shifts.
- Floor deflection you can feel when you walk. A bouncy addition floor usually points to joists that were spaced too far apart or a missing beam. American Standard fixtures are heavy. A tub full of water plus framing that isn’t right equals a sag you’ll feel for years.
- Moisture or mold smell near the tie-in point. Where the old roof meets the new roof is the most common leak point on any addition. If the underlayment wasn’t lapped correctly, water finds its way in during Woodland Hills winter rains.
- A mini-split or HVAC line that can’t keep up. Many additions were sized with a load calc that ignored western exposure. In late summer, that room hits 15 degrees hotter than the rest of the house. That’s a design failure, not an equipment failure.
- Doors that stick seasonally. A door that only binds in August or February is a sign the framing wasn’t tied correctly to the existing structure. The two buildings move at different rates, and the door is the canary in the coal mine.
See the difference
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AfterReplacement Cost & What’s Included
In Woodland Hills, a full home addition runs $45,000 – $130,000 depending on square footage, foundation type, and whether you’re adding plumbing or just living space. ADU construction, which includes a kitchen and bath by definition, starts at $90,000 and commonly reaches $220,000 for an attached unit with higher-end fixtures. Garage conversions sit between $30,000 and $80,000.
Every Mason Remodeling Co Woodland Hills project includes a written price before any work starts. That’s not an estimate that drifts. It’s the number. It covers labor, materials, permits, and the fixtures. Any American Standard product we integrate gets installed to manufacturer spec. Our 365-Day Done Right Promise means if anything isn’t right within a year of completion, we make it right at no cost to you.
DIY or Call Us?
You can safely do the homework part: measure your lot, check Woodland Hills planning codes for setback requirements, and print out the California ADU handbook from HCD. That’s genuinely useful. What you shouldn’t do is touch structural framing, electrical, plumbing, or roofing tie-ins yourself. A bad roof tie-in on a Woodland Hills home means water in the walls within one rainy season. Foundation work done wrong means cracks before the paint dries.
If you already have a failed addition or ADU, call us at (831) 290-6866. We’ll tell you whether it’s a repair or a rebuild, and we’ll tell you straight what that costs. No pressure, no games. That’s how Isaac Pruett and our whole crew have worked in Woodland Hills for years, including plenty of projects near Warner Center and the surrounding neighborhoods.
FAQs
A properly built addition or ADU in Woodland Hills lasts 50+ years, but the roof tie-in and foundation are the two things that fail first if the original work was done cheaply. California’s dry, hot summers followed by wet winters cycle expansion and contraction constantly, so flashings and soil grading need to be right from day one.
Yes, in many cases. If the foundation is sound and the framing is dry, we can reframe tie-ins, reflash roofs, replace drywall, and level floors without a full teardown. We’ll look at the structure and tell you honestly which path makes sense. Call (831) 290-6866 and we’ll schedule a look.
Most detached ADUs take 6 to 10 months from permit submittal to final inspection. Additions run 3 to 6 months depending on scope. The permit phase in Los Angeles County is the variable. We handle that end, and our written quote reflects the full timeline up front.
We don’t stock every American Standard SKU, but we order directly through our specification-grade supplier relationships, which include KraftMaid, Cambria, and Silestone for the surrounding finishes. That means your American Standard fixtures arrive on schedule, matched to your build, without the big-box “substitute a different model” runaround.
When it’s time to get the real number, call (831) 290-6866 to schedule your free estimate. We’ll send a background-checked, uniformed technician with photo ID and a name you’ll know before we arrive. That’s the Threshold Standard, and it’s how we do every job in Woodland Hills.
Written by Isaac Pruett, Owner, Mason Remodeling Co – Woodland Hills, CA at Mason Remodeling Co Woodland Hills, serving Woodland Hills and nearby areas.
