Plumbing Disconnect and Reconnect on Install Day
The countertop crew arrives to set stone. Before that can happen the sink, faucet, disposal, dishwasher line and air gap have to come apart, and afterward they have to go back together. That plumbing work is short, but it has a real failure mode, and it is the most common reason an install day runs long in a house of this age.
Who Actually Owns the Plumbing
There is no industry standard here, which is why it causes so much trouble. Some fabricators include disconnect and reconnect in the price. Some disconnect only, and leave reconnection to the homeowner or a plumber. Some exclude plumbing entirely in a line of the contract that nobody reads until the truck is in the driveway. Get it in writing, by name, for both halves of the job. If the answer is that you are handling it, that means arranging a plumber for two separate short visits, and it means being sure the second visit can happen after the adhesive has cured rather than the same afternoon.
Shutoff Valves That Have Not Moved in Decades
Under a great many kitchen sinks around here you will find the original multi turn stops, chrome plated, with a stem packing nut and a washer compressed in one position since the house was young. Turning that valve for the first time in forty years is the moment it fails: the handle spins without closing, or the stem weeps around the packing nut, or the seat will not seal and a slow drip continues with the valve shut. The practical answer is to test both stops a day or two before the install rather than on the morning of it, and to budget for quarter turn ball stops if either one misbehaves.
The Disposal, the Dishwasher and the Air Gap
The disposal has to come off the sink flange and it is heavier than people expect, so it needs support rather than being left to hang from the drain arm. Its electrical connection is either a cord and plug or hardwired, and hardwired means the circuit goes off at the panel first. The dishwasher drain usually runs to an air gap fitting mounted through the counter, which is a code requirement in California and not an accessory. That fitting has to be pulled and the new top drilled for it, so confirm the air gap is on the fabrication drawing along with the faucet.
Why the Sink Cannot Go Straight Back
An undermount sink is held by clips and adhesive, and the silicone bead around the sink and along the seams needs time to cure before anything loads it or wets it. Installers commonly ask for twenty four hours, sometimes less depending on product and weather. That wait is not padding. Reconnecting a drain too early puts weight and vibration on an unset bond, and running water across a fresh seam is how you get a leak that only shows up as a swollen cabinet floor months later. Even a drop in sink usually wants the sealant to set before it is loaded.
Faucet Holes: Shop or Site
Holes for the faucet, sprayer, air gap and dispenser are normally drilled at the shop, where the slab is supported flat and the drilling is done wet with proper bits. Drilling on site over the cabinets is possible but riskier, particularly near an edge or a cutout corner. The consequence for you is a decision deadline: the fabricator needs the actual faucet model, or at least its exact hole count and spread, at template time. Choosing a faucet after the slab is cut means either living with the holes you have or paying for site drilling.
The Night Without a Kitchen Sink
Put the sequence together and the shape of the day is clear. The old top and sink come out in the morning, the new top is set and the sink is bonded in the afternoon, the silicone cures overnight, and the plumber or installer returns the following day to reconnect the drain, the disposal, the supply lines and the dishwasher. That is one night, sometimes two, with no working kitchen sink in the house. It is entirely manageable if you know it is coming: fill a couple of jugs, keep the dish tub near the bathroom or laundry sink, and run the dishwasher empty and dry before the install rather than leaving a load in it.