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Delta Home Additions & ADU: The Woodland Hills Owner’s Guide
Delta home additions and ADUs in Woodland Hills typically run $45,000 to $130,000 for a full addition, and $90,000 to $220,000 for a complete ADU build. Sawyer Remodel Woodland Hills handles the whole job from foundation to finish, with a written price before any work starts. Most owners call us when their existing Delta product (a faucet, a shower valve, a cabinet pull, a door hinge) has failed inside a space they’re already planning to expand or convert, and the question becomes whether to patch the part or build around it.
Which Delta Models This Applies To
Delta makes hundreds of fixtures and components, but in the Woodland Hills market the ones we see tied to additions and ADUs are almost always Delta’s Trinsic, Zura, and Dryden lines for kitchens and baths, plus the MultiChoice universal valve bodies that let you swap shower trims without opening the wall. The gotcha most owners hit: Delta’s cartridge sizes are not universal across every model year, and a Trinsic trim will not fit a Zura rough-in without a specific adapter. Check the stamped number on the valve body behind the handle, usually a 5-6 digit code starting with R or RP, and match that to the trim kit. That number matters more than the faucet’s name.
For OEM versus aftermarket, Delta’s own cartridges and seals are worth the extra money on anything that holds water pressure. Aftermarket kits from brands like Danco and Eastman are fine for low-stress parts like aerators and pop-up assemblies, but a knockoff shower valve cartridge in Woodland Hills hard water tends to seize within 18 to 24 months. We’re an independent contractor, not a Delta distributor, so we recommend whichever part actually holds up here, not whatever has the biggest margin.
Styles & brands we work with
Signs Your Delta Home Additions & ADU Is Failing
- Water pressure drops in the new bathroom or kitchen even though the main line is fine. This usually points to a scaled or cracked Delta valve cartridge. Woodland Hills water sits around 10 to 12 grains of hardness, which is enough to build mineral scale inside a cartridge in about two years.
- The handle turns but the temperature won’t stay set. A worn Delta pressure-balance cartridge (the RP19804 or RP32104, depending on year) loses its ability to compensate when someone flushes a toilet or runs the washing machine. The result is sudden scalding or cold blasts in the ADU shower.
- Water seeps out from behind the trim plate, or the wall below the valve feels damp. The O-rings and seals around the valve body are the first thing to degrade, especially in an unventilated ADU bathroom. Left alone, this rots the drywall and the studs behind it.
- The pull-down spray head on the kitchen faucet won’t retract or drips when the water is off. Delta’s braided hose and docking mechanism wear out faster than the faucet body itself. A sagging hose is the tell, and replacing the hose assembly beats replacing the whole faucet.
- The finish is pitting or flaking on Delta hardware that’s only a few years old. In a coastal-adjacent climate like Woodland Hills, the moisture and occasional Santa Ana dust combine to eat at clear coat finishes. Failures show up first on handles, then on the escutcheon plate behind the valve.
See the difference
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AfterReplacement Cost & What’s Included
On a Delta addition or ADU project in Woodland Hills, we quote the whole build at $45,000 to $130,000 for an addition and $90,000 to $220,000 for an ADU, with fixtures and finish materials as line items inside that number. The Delta-specific parts sit inside those larger budgets: a new MultiChoice valve with a Trinsic or Zura trim kit lands between $350 and $800 installed, depending on whether we’re roughing in a new wall or replacing an existing valve.
What drives the range: access to the valve, whether the wall is open or we have to cut and patch, the finish level you choose, and whether your existing Delta piping needs updating to meet current LA County code for the ADU’s plumbing. Every quote includes parts, labor, drywall repair if needed, and a written guarantee on the work. Our 365-Day Done Right Promise covers the install and the parts we put in. If the repair fails within a year, we come back and make it right, free of charge.
DIY or Call Us?
Replacing a Delta aerator, a pop-up drain assembly, or a shower head is a Saturday job most homeowners can handle with a wrench and some plumber’s tape. Anything behind the wall is a different conversation. A Delta pressure-balance valve that’s embedded in an existing wall requires shutting off water at the main, cutting precise drywall access, and testing the new cartridge under live pressure. Get the cartridge seating wrong and you’ll have a slow leak inside the wall cavity of your Woodland Hills ADU, which you won’t notice until the baseboard starts warping.
If you’re converting a garage to an ADU or adding a primary suite, the Delta fixtures should be handled as part of the rough-in, not bolted on after the tile goes up. We stock Delta valves, trims, and common cartridges on the truck, so we’re ready to match what’s already in the house or build from scratch. Call (341) 217-2776 for a free estimate on the whole project.
FAQs
Plan on 3 to 6 months for an ADU and 4 to 8 months for a full home addition, depending on the scope, the slope of your lot, and how fast LA County plan check moves. The Delta fixtures themselves install in a day or two. The structure around them is what takes the time. Call (341) 217-2776 and we’ll give you a written timeline before any work starts.
Cartridges and seals can usually be rebuilt with OEM Delta replacement parts, which runs $50 to $120 for the part itself. If the valve body inside the wall is cracked or corroded, rebuilds aren’t worth it and a full valve replacement is the honest call. We’ll show you the failed part before we quote you anything. Call (341) 217-2776 to schedule a look.
We keep the common Delta MultiChoice cartridges, O-ring kits, trim screws, and shower heads on the truck for immediate swap work. Specialty finishes like champagne bronze or matte black are usually a 3 to 5 day order through our supplier. If it’s not on the truck, we’ll tell you the eta before you commit. Call (341) 217-2776 and we’ll check inventory while you’re on the phone.
No. The written price we give you before work starts is the price you pay. If we find rot or code violations inside the wall, we stop, show you photos, and hand you a new written number before touching another tool. That’s the Relay Visibility Guarantee, and it’s how we run every job in Woodland Hills. Call (341) 217-2776 for your free estimate.
Written by Luca Romano, Owner, Sawyer Remodel Woodland Hills at Sawyer Remodel Woodland Hills, serving Woodland Hills and nearby areas.
