Undermount sink or stone countertop first?

Every operation in a stone shop runs off the approved template. The saw path, the machined openings, the faucet holes and the edge run are all generated from that one file, and the sink opening in it is a copy of a real object with real dimensions. Two 30 inch undermount bowls from different manufacturers do not share a radius, a lip or a mounting depth, so a generic opening is not a thing a fabricator can produce.

Teccorp Stone puts the consequence in plain terms: the approved template is the production reference, and a change made after cutting starts can mean re-fabricating a section at full cost. That is not a deposit lost or a delay absorbed. It is a second piece of slab, a second run through the saw and the CNC table, and a second polish. GTA shops list finalising the sink, faucet and cooktop before template day, and leaving the cabinets alone afterwards, as a straightforward way to spend less on the job.

Which means the buying order is inverted from what most homeowners expect. The sink gets bought early, sometimes weeks before anything visible happens, and it sits in a box while the fabricator works around its measurements. Faucet too, because the number of holes and their spacing is machined at the same time. On Home Depot Canada's Ontario pricing, one sink cut-out and one faucet hole are bundled into the installed price, which tells you the shop assumes both objects are known quantities by the time the saw runs.

The first sink is included almost everywhere in the GTA. Beyond that, the numbers spread. An additional undermount sink cut-out and polish runs $150 to $500 across the published Ontario sources, with Natural Stone City quoting $150 to $500, Stone Valley Countertops quoting $250 to $350 and Ottawa General Contractors quoting $250 to $400. On granite specifically the band sits lower at the bottom end, since DreamStone Kitchen in Mississauga quotes $100 to $200 per cut-out against Stone Valley's $250 to $350.

Cooktop openings are quoted separately again, and the disagreement there is worse. Home Depot Canada prices a cooktop cut-out at $125 to $150 on Ontario pricing while Stone Valley Countertops prices it at $250 to $450 in the GTA, a spread of more than three times for the same operation. Read any single published figure as a starting point rather than a rate card, and ask each shop for its own number in writing.

The count matters more than the unit price on kitchens that have grown fussy. A prep sink in the island, a bar sink at the end of a run, a soap dispenser and a filtered water tap are four extra openings, and every one of them is machined, polished and paid for. The line by line fabrication charges are where those extras become visible before they become an invoice.

There is a second charge attached to an undermount sink that has nothing to do with cutting the hole. Home Depot Canada charges $175 to $275 per sink on Ontario pricing to finish and polish the exposed edge of an undermount cut-out. The reason is geometry. An undermount bowl hangs below the stone, so the machined edge of the opening stays in view and in reach of every hand that uses the sink. A drop-in sink sits in the hole with a rim over it, and the rim covers that edge.

So the polished reveal is a finished surface in its own right, ground and wet polished through the same diamond pad sequence as the outside edge of the countertop, on a curve, in a confined shape. That is slower work per inch than a straight run, which is why it carries its own line.

It also compounds. On a two-sink vanity the cut-out is doubled and the polish is doubled, and both charges are per sink rather than per job. A double vanity therefore jumps more than its extra width suggests, and the plumbing follows the same pattern: City Rooter's published Toronto flat rates put a second faucet hook-up at $245 to $275 depending on the faucet type. The vanity top cost picture shows how quickly a small piece of stone stops being priced like a small piece of stone.

Three sink types produce three different fabrication jobs. An undermount needs a machined opening, a polished reveal and mounting hardware under the stone. A drop-in needs an opening with a rougher tolerance, since the rim hides the edge, and no polish charge. A moulded integrated bowl needs no opening at all, because the bowl and the top are one moulded piece.

Blackwood Kitchens prices that third route on Ontario vanities at $600 to $1,200 installed for a cultured marble or acrylic top with a moulded integrated sink, against $900 to $2,200 installed for a quartz top with an undermount sink. Part of the gap is material and part of it is the absence of a cut-out charge entirely. For a secondary bathroom or a rental unit the arithmetic is hard to argue with, which is one reason moulded tops persist in a market that talks mostly about stone.

The trade-off is that the moulded bowl is the bowl you get, permanently, and the surface around it is a softer material. On bathroom vanity tops the index lists 23 companies, against 175 for quartz countertops, which is a rough measure of where the GTA market's attention sits.

Of the 876 companies in the index, 175 are listed under quartz countertops, 120 under granite, 110 under marble and 23 under bathroom vanity tops. The records carry a category, an area, a phone number on 861 of them and a website on 783. None of them carries a field for whether the company supplies sinks, stocks a particular brand, or will machine an opening for a bowl you bought elsewhere.

That last question is the practical one, and it has to be asked directly. Some GTA fabricators sell sinks as part of the package and prefer to, because a sink they supplied is a sink whose dimensions they already hold. Others will cut to a customer-supplied bowl on the condition that it arrives before template day. The difference changes your buying sequence by weeks, and no amount of listing data will tell you which kind of shop you are calling. Companies across Brampton and the rest of the coverage area handle it differently from one another.

Ratings do not help here either. The 845 rated companies in the index average 4.7, which says something about general satisfaction and nothing at all about sink policy.

Once the pieces are cut, the sequence at the house is short. The old top comes off, the cabinets get checked, the new pieces are set and shimmed level, seams are joined and cured, and the sink is attached. On many jobs the sink is mounted in the shop instead, on the underside of the piece, so it arrives already hung.

The plumbing reconnect comes last and is quoted separately at essentially every GTA fabricator, and sits outside the per square foot rate in the installed cost breakdown. The one thing worth carrying over here is timing: an undermount bowl hangs from adhesive, and a plumber cannot load a trap onto it the moment it is set. Ask the fabricator when the sink will take weight, and book the reconnect after that point.

Two small lines round out the list. Natural Stone City puts optional sealing at $50 to $150 per countertop and slab transport at $50 to $200. Neither is large. Both belong in the written scope alongside the cut-outs, because a quote that omits four small lines and a quote that includes them can look identical at the bottom.