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Silestone Home Additions & ADU: The Los Angeles Owner’s Guide
We install Silestone countertops and surfaces as part of home additions and ADU construction across Los Angeles, and the typical full project runs $53,100 – $153,400 depending on square footage, foundation work, and finish level. Most owners call us when they’re planning an ADU or addition and want a surface that won’t need replacing in eight years, or when a previous contractor installed Silestone and something about the job didn’t hold up. We’ll match your Silestone profile, price the whole project in writing before work starts, and send a crew you can identify by name and photo before they ever knock on your door.
Which Silestone Models This Applies To
Silestone is a quartz surface made by Cosentino, and it comes in multiple series: the standard Silestone line, Silestone Eternal, and newer releases like Sunlit Days and Le Chic. For home additions and ADUs in Los Angeles, most of our clients are working with 12mm or 20mm slab thicknesses, with 20mm being the standard for kitchen countertops and bathroom vanities. Here’s the compatibility gotcha we see regularly: Silestone’s polished slab sizes vary by color line, and not every color is available in a jumbo 128″ slab. If your ADU kitchen island spans more than 110 inches, certain colors won’t make the span without a seam. We check slab availability against your layout before we ever quote a number, so you’re not surprised mid-project.
As for OEM versus aftermarket: Silestone doesn’t sell “parts” the way an appliance brand does. What you’re really buying is the slab, the fabrication, and the installation. We source full-slab Silestone through authorized distribution, and that matters because two slabs of the same color from different batches can show visible veining differences. For additions and ADUs where counters flow from island to perimeter, we order all slabs from the same lot. That’s a detail a lot of Los Angeles general contractors skip.
Styles & brands we work with
Signs Your Silestone Home Additions & ADU Is Failing
- Seam separation or cracking at the seam. Quartz expands and contracts with temperature swings. In Los Angeles, an uninsulated ADU can hit 100-plus degrees in summer and 45 in winter. A poorly gapped seam will open up. The fix is a re-bond and re-polish, not a full replacement, unless the slab itself has cracked.
- Chipping at the edge near the sink or cooktop. This is usually fabrication error: the edge profile was cut too thin or someone dropped a pot on a weak point. Small chips can be filled and color-matched. Multiple chips along one edge means the overhang was unsupported.
- Discoloration or dull spots that don’t polish back. Silestone is non-porous, but the resin binder can scorch if a hot pan sat directly on the surface. Acidic spills won’t etch it the way they etch marble, so dull spots almost always point to heat damage or a defective polish from the fabricator.
- The counter is out of level by more than 1/8 inch. We level every substrate before install. If yours rocks or a glass of water pools in one corner, the cabinets beneath were never shimmed, or the slab was set on an uneven deck. That’s a substrate problem, and it’s the first thing Isaac Pruett checks when he walks a failed job.
- A crack running from the corner of the sink cutout. This is the most common Silestone failure in ADUs. The fabricator cut the sink opening with square inside corners instead of a radius, and stress concentrated there. It’s fixable with a structural epoxy repair, but if the crack has spread more than six inches, the slab needs replacement.
See the difference
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AfterReplacement Cost & What’s Included
For a Los Angeles ADU or home addition involving Silestone surfaces, the full project cost ranges from $53,100 for a modest single-room addition with basic Silestone counters to $153,400 for a detached ADU with a full kitchen, bathroom, and higher-end Silestone colors. Countertop installation alone, if you’re replacing just the surface, runs $2,360 – $7,670 including fabrication, sink cutout, and install. The bigger number for most people is the whole addition or ADU, because you’re paying for foundation, framing, electrical, plumbing, drywall, and finishes all at once.
Every quote we write in Los Angeles is a line-item price delivered before work starts. No verbal ballpark that grows into a final bill that’s 40 percent higher. We cover our workmanship for 365 days from completion under the Done Right Promise, and if a seam fails or a cabinet door binds inside that year, we return and fix it at no charge. The Silestone warranty itself is a manufacturer warranty handled through Cosentino; we document the lot numbers and install date so you’re covered downstream.
DIY or Call Us?
Countertops aren’t dangerous the way garage springs or electrical panels are, but a 20mm quartz slab weighs roughly 13 pounds per square foot. A 9-foot island top can weigh 450 pounds. That’s a two-person lift with proper suction cups, and it’s the point where DIY goes wrong: slabs crack in transit, seams land in the wrong spot, and an unsupported overhang fails later. What you can safely do yourself is measure your existing tops, note the Silestone color name from the underside label, and check whether your cabinets are level. That’s useful information for the quote.
What you shouldn’t do is attempt to remove and re-set a slab to save money. We’ve rebuilt jobs in Encino and Woodland Hills where a homeowner cracked a $2,000 slab halfway to the truck. The savings weren’t there. If you’re somewhere in Los Angeles and your Silestone surface is failing or you’re planning an addition or ADU, call (803) 680-2547 for a free estimate. We’ll match the right slab, write the real price, and tell you exactly who’s showing up.
FAQs
Silestone quartz typically lasts 25-plus years when properly fabricated and installed. The weak points are seams and sink cutouts, not the material itself. In Los Angeles ADUs that get extreme heat swings, we recommend keeping indoor temps above 45 degrees in winter and sealing any uninsulated spaces before install to reduce thermal movement.
Small chips, seam separations, and cracks under six inches can usually be repaired with structural epoxy and color-matched resin. Cracks that have spread through the full depth of the slab or run more than six inches generally require replacement because the repair won’t hold under daily use. We’ll assess it in person and tell you straight if repair money is wasted money.
Template to install typically runs 5 to 10 business days in Los Angeles. We template, fabricate at a local shop, and install in one visit. For a full ADU or addition, the countertop work is scheduled after cabinet set and before plumbing trim, and it adds one day on-site.
We source full-slab Silestone through authorized fabricators in the Los Angeles area and order everything to match your layout. We also work with Cambria and Caesarstone if you’re comparing quartz, and KraftMaid or Wellborn if you need cabinetry to go with the tops. You’re never stuck chasing slabs on your own; call (803) 680-2547 and we’ll check availability while you’re on the phone.
No. The price we write before work begins is the price you pay, unless you change the scope. If you add a row of tile or an extra outlet, we write a separate change order with its own price, so there’s never a surprise on the final bill. Call (803) 680-2547 to get your written quote.
Know who’s coming, know what it costs, know it’s backed up – everything else is just noise. If you’re planning a Silestone home addition or ADU in Los Angeles, start with a free estimate: (803) 680-2547.
Written by Isaac Pruett, Owner, Mason Remodeling at Mason Remodeling, serving Los Angeles and nearby areas.
