Rancho Cucamonga Custom Countertops is San Bernardino County's trusted specialist in undermount sink reattachment in Rancho Cucamonga, CA, specializing in re-anchoring sink clips, rebuilding the rim seal and adding under-sink support for heavy basins. We offer sink re-hangs and on-site cutout enlargement in granite, quartz and marble countertops.
Get a free template visit or a bid
Or call (909) 922-1858. Calls only, we do not receive text messages.
Our team provides a close inspection of the countertop and the cabinet below it, delivering a sink that sits tight and dry for kitchens and baths and a reliable fix for both residential and commercial projects. The same crew that re-hangs your sink templates any new cutout, and every job carries a written warranty.
From epoxying new clip studs into the stone every six to eight inches to wet-cutting a larger opening for a new basin, our team handles every detail. Serving Rancho Cucamonga, Ontario, Chino and Eastvale, we treat a dropping sink as the urgent job it is and leave the stone around it sound.
How we work
Homeowners get a free template visit. Contractors, cabinet shops and builders get tops to their schedule.
An undermount sink in Rancho Cucamonga hangs below the stone, held up by metal clips anchored into the underside of the countertop and sealed to it with a bead of adhesive or silicone around the rim. Either part can fail, and when it does the sink starts to pull away.
The clips do the lifting. Each one sits on a threaded stud that is set into the stone with a two-part epoxy, and a nut and bracket press against the sink flange. A typical kitchen sink uses eight to twelve clips spaced about every six to eight inches. The rim seal keeps water out of the gap and helps carry the sink, but it is not meant to hold the weight alone.
A light stainless bar sink can ride mostly on epoxy and a couple of clips. A heavy fireclay or cast iron basin cannot: it needs mechanical support underneath, such as a frame or rails fixed to the cabinet, because adhesive alone should never be trusted to carry that load for years. Many failures we are called to are heavy sinks that were hung only from the stone.
The first sign an undermount sink is failing is a gap or a dark line opening between the rim and the stone, often at the front edge; drips inside the sink cabinet and a sink that moves when you press on it follow. Treat any of these as urgent.
If the sink has visibly dropped, support it before using it again. A full basin of water is heavy, and a sink that lets go completely can tear the plumbing, crack the cabinet floor and chip the stone edge on the way down. A short length of lumber wedged from the cabinet floor to the underside of the sink will hold it until the repair visit. Keep the dishwasher and disposal off if their connections are under strain.
Reattachment means lowering the sink, cleaning the old adhesive off both the stone and the flange, setting new clip studs where the old ones failed, and hanging the sink again on a fresh seal with the clips tensioned evenly. For heavy basins, support is added under the sink as part of the same job. Surface preparation decides whether the new bond holds. The underside of the stone and the sink flange are cleaned with a solvent such as denatured alcohol to remove old silicone, slurry and oils. A continuous bead of 100 percent silicone goes around the opening as the waterproof barrier. The sink is pressed up into it, the clips are fitted and tightened in turns so the rim draws up evenly, and the joint is cleaned and left to cure.
Sometimes a clip pulled out because the stud was set too close to the cutout edge or in a thin section of stone. We move the studs to sound material rather than setting them back in the same failed holes. If the narrow strip of stone in front of the sink has cracked, that is a structural repair to the top and is quoted before the sink goes back up.
The drain and disposal have to be disconnected to lower the sink and reconnected afterward. We tell you at booking whether that is included in the visit or whether your plumber should handle it.
Undermount sink reattachment in Rancho Cucamonga is typically estimated at roughly $200 to $600, with the sink's weight, whether new support has to be built underneath and the plumbing work moving the price the most. A light stainless sink re-hung on new clips sits at the low end.
Costs climb when a heavy fireclay or cast iron basin needs a support frame, when the cabinet floor has water damage, when studs have to be relocated to sound stone, or when a cracked strip in front of the sink needs repair first. Enlarging a cutout for a new sink is priced separately, because it involves templating and cutting the stone on site.
These are estimates for Rancho Cucamonga and subject to change. Your written quote, given after we see how the sink is hung and what failed, sets the final price.
Swapping to a larger undermount sink means enlarging the opening in the stone on site, which is possible within limits set by the sink base cabinet and by how much stone remains in front of and behind the new opening. A sink that needs a wider cabinet than you have cannot fit without cabinet work. We template the new sink against the existing opening, check the cabinet's inside width, and confirm the strip of stone that will remain at the front and back. If the strip would be too thin to carry load, we say so and suggest a sink size that fits. The new edge is cut, profiled and polished so it matches the finish of the old one, because an undermount opening shows its edge to everyone who uses the sink.
Cal/OSHA's silica standard, made permanent in 2025, prohibits dry cutting of engineered stone and high-silica natural stone and requires wet methods for cutting and grinding. Every cut we make in your kitchen is made wet, with the area masked and the slurry collected, so no dry stone dust is raised in your home.
Changing sinks is also the moment to add or relocate a faucet, soap dispenser or filter tap hole. Each new hole is drilled wet with a core bit at the same visit, positioned for the new faucet's spread.
A dropped sink in a rental is a vacancy problem as much as a repair, and property managers in Rancho Cucamonga use reattachment to get a unit working again without replacing the top. Restaurant prep sinks and office break rooms see heavier daily use and fail on the same pattern.
For owners with several units, we can check the sinks at each door for early signs of failure and re-hang the loose ones before they drop, which is far cheaper than repairing a cracked cabinet and a chipped edge afterward.
The process
Four steps, and nothing is cut until you have approved the slab and the seam layout.
Homeowners book a free template visit. Contractors and builders send plans and a finish schedule for a bid.
You pick the material and the slab, and we mark where every seam will fall before it is approved.
We template on your installed cabinets, then cut, edge and polish the tops in the shop.
The same crew sets the tops, fits the sink, joins the seams and leaves the room clean.
Questions
The clips anchored in the stone or the adhesive seal around the rim has failed, often because a heavy sink was hung without support underneath. Once one clip lets go, the load shifts to the rest and the gap grows.
Yes. The sink is lowered, the old adhesive is cleaned off, new clip studs are set in sound stone and the sink is re-hung on a fresh seal. The top stays in place.
Reattachment is typically estimated at roughly $200 to $600 in Rancho Cucamonga, depending on the sink's weight, added support and plumbing. Your written quote sets the final price.
No. Prop it from below with a piece of lumber, keep it empty and book a repair. A full sink that lets go can crack the cabinet, tear the plumbing and chip the stone.
Usually, yes, within the limits of the sink base cabinet and the stone left in front of and behind the opening. We template the new sink first and tell you if the size will not work.
Every cut is made wet, as Cal/OSHA's silica rules require for engineered stone and high-silica natural stone, with the area masked and the slurry collected. No dry dust is raised.
The re-hang is usually done in one visit, but the adhesive needs time to cure before the sink carries water. We tell you how long to wait before using it.
Yes. We handle undermount sink repairs in Rancho Cucamonga and nearby cities including Ontario, Chino, Eastvale and Fontana.
Homeowners get a free template visit. Contractors and builders can send plans for a bid.
Licensed, bonded & insured · License #585047. Calls only, we do not receive text messages.
