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Blanco Home Additions & ADU: The Los Angeles Owner’s Guide
Building a Blanco home addition or ADU in Los Angeles typically runs $53,100–$153,400 for a full addition and $106,200–$259,600 for a detached or garage-conversion ADU. We install Blanco fixtures and fittings as part of those projects, matched to the specific Blanco model line you have in your existing spaces. Most Los Angeles homeowners discover their Blanco components are failing mid-project: a Silgranit sink that has hairline cracks near the drain, a pull-out spray head that no longer retracts, or a faucet cartridge that drips long after the handle is shut off.
We are an independent Los Angeles remodeling contractor, not affiliated with Blanco. But we spec, source, and install Blanco parts on a regular basis, and we know which components hold up in Southern California hard water and which ones need replacement sooner than the catalog suggests.
Which Blanco Models This Applies To
Blanco makes several product lines used in kitchens, wet bars, and ADU kitchenettes. The parts that matter for a remodel or ADU build are usually in the Silgranit sink series (PuraDur, PuraDur II), the stainless steel sink lines (Super Single, Precision, Performa), and the faucet ranges (Culina, Linus, Alta, Livon). Each series has specific mounting dimensions and cutout templates, and they do not interchange freely.
The compatibility gotcha we see most often in Los Angeles: a homeowner buys a Blanco faucet for a Silgranit sink, but the deck hole configuration doesn’t match. Blanco sinks are drilled either single-hole, two-hole, or three-hole for faucet mounting, and some models have a pre-drilled soap dispenser hole that cannot be re-drilled without voiding the sink warranty. Before you order any Blanco part, check the model number etched into the underside of the sink bowl or stamped on the faucet body. If that label is gone, measure the bowl depth (Silgranit models run 6½" to 10" deep) and the drain opening (standard 3½" across most residential Blanco sinks, but the commercial-style models take a larger basket).
On the OEM-versus-aftermarket question: Blanco OEM cartridges, spray heads, and mounting hardware are built to tighter tolerances than most aftermarket equivalents, and we typically recommend OEM for anything that touches water flow or seals. For mounting clips, drain assemblies, and decorative trim, a quality aftermarket part from a trade supplier works fine and can trim $40–$120 off the parts line. We tell you which is which before any work starts.
Styles & brands we work with
Signs Your Blanco Home Additions & ADU Is Failing
- Hairline cracks radiating from the drain opening in a Silgranit sink. This is thermal stress or an over-tightened basket strainer. Silgranit is a granite-composite material, and once a crack forms, it will spread through normal use. The sink typically needs replacement rather than repair.
- Faucet drips or seeps at the base after the handle is fully closed. The ceramic disc cartridge inside the faucet body has worn or accumulated mineral scale. In Los Angeles, hard water accelerates this. A replacement cartridge usually restores the faucet.
- Spray head won’t retract or droops from the spout. The counterweight or the retraction hose spring has failed. This is a simple parts fix, but getting the wrong hose length creates a spray head that either hangs loose or yanks back too hard.
- Water pooling around the sink rim or under the counter. The silicone seal between the sink flange and the countertop has broken down, or the mounting clips have loosened over time. If water has been sitting, the substrate underneath may need inspection before a new sink or faucet goes in.
- Drain assembly takes forever to clear or the basket strainer won’t seat. Blanco drain assemblies use specific thread patterns. A mismatched aftermarket drain may thread partway and then bind, which is why owners end up with a sink that won’t hold water or drains at a trickle.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
For a Blanco-specific repair or fixture swap within a Los Angeles home addition or ADU, the installed cost breaks down like this:
- Faucet cartridge replacement: $470–$825 installed, including the OEM or approved cartridge and labor. This is the most common Blanco repair we handle.
- Spray head and hose replacement: $295–$710 installed, depending on whether the faucet is a pull-down Culina or a side-spray model.
- Silgranit sink replacement: $945–$2,950 installed, including the new sink, drain assembly, mounting hardware, and removal of the old sink. The range depends on sink size, whether the countertop cutout needs adjustment, and whether we’re working in a finished kitchen or a bare ADU shell.
- Full Blanco kitchen or ADU fixture package (sink, faucet, drain, soap dispenser): $2,360–$7,670 installed, which overlaps with our standard countertop and kitchen installation pricing.
Every quote is written, not verbal. The number you approve before work starts is the number on the invoice. The 365-Day Done Right Promise covers the installation: if the faucet leaks, the sink shifts, or the drain fails inside a year, we come back and fix it at no charge. If the repair fails during that same window, the return visit is free too. No service call, no re-inspection fee, no negotiation.
DIY or Call Us?
Some Blanco issues are safe to check yourself. You can tighten a loose basket strainer, confirm the model number under the sink bowl, and clear mineral buildup from the aerator screen with a small wrench and some vinegar. None of that requires touching water supply lines or prying at the countertop.
Where we draw the line: any repair that involves disconnecting the water supply, cutting or resealing the countertop seal, or pulling a Silgranit sink from its mounting is work better left to someone who does it regularly. Sinks are heavy. Countertops chip. Water leaks inside a cabinet tend to announce themselves weeks after the drywall has already started swelling. If you’re not sure, call us at (213) 277-6578 and describe what you’re seeing. We’ll tell you honestly whether it’s worth a service visit or something you can handle with a screwdriver.
FAQs
A Blanco Silgranit sink typically lasts 15–25 years in normal residential use, but Southern California hard water shortens the lifespan of the drain assembly and faucet cartridge to somewhere around 5–10 years. The sink bowl itself rarely fails before the hardware around it does. Call (213) 277-6578 and we can tell you whether the sink or just the fittings need replacing.
No. A crack in granite composite material cannot be reliably bonded, and any repair you see online will fail when the sink flexes under a full basin of water. Replacement is the honest fix. The written quote covers removal, new sink, new drain, and resealing, so the price does not drift after we start.
A faucet cartridge or spray head swap runs about an hour. A full Silgranit sink replacement takes half a day in most Los Angeles homes, including removing the old seal, mounting the new sink, and reconnecting the drain. We give you an arrival window before the work, not after.
We stock common Blanco cartridges, spray heads, hoses, drain assemblies, and mounting hardware on the truck. For model-specific parts like a special-size Silgranit bowl or a discontinued finish, we order direct from our trade supplier, which usually lands in 2–5 business days in the Los Angeles area. We also carry compatible parts for KraftMaid cabinetry, Cambria countertops, and Silestone surfaces, so a kitchen or ADU fixture swap doesn’t turn into a three-contractor job.
Written by Trevor Nash, Owner, Penhallow Remodeling Los Angeles at Penhallow Remodeling Los Angeles, serving Los Angeles and nearby areas.
