Under-sink kitchen drain assembly serviced by Rare Breed Plumbing in Utah

What to Know Before a Kitchen Plumbing Remodel

By Court Lundberg · July 9, 2026

Kitchen remodels consistently rank among the most expensive home improvement projects, and plumbing is one of the main reasons they exceed budget. Not because plumbing work is inherently unpredictable, but because homeowners often don’t know what to expect until surprises show up mid-project.

The best way to protect your budget and your timeline is to understand what kitchen plumbing remodeling actually involves before work starts. Here’s what you need to know.

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What Triggers a Plumbing Scope Change

Changing cabinet layout or moving the sink to a new location are the most common triggers for significant plumbing work. As long as your new kitchen puts the sink in the same location as the old one, plumbing changes are minimal: new supply connections, a new drain assembly, and possibly new shutoff valves. That’s a straightforward job.

Moving the sink, even a few feet, is a different situation. It requires extending or rerouting supply lines and the drain line to the new location. The drain is the more complex piece because it requires proper slope (1/4 inch drop per foot of horizontal run), and depending on where the new sink position falls relative to the existing drain stack, it may require opening walls or the floor.

If you’re planning a significant kitchen layout change, a plumber should be part of the early planning conversation, not an afterthought after cabinets are ordered.

What Gets Inspected When Walls Come Open

Remodeling is one of the best times to assess the condition of your existing plumbing, because the walls and sometimes the floor are already open. A plumber doing kitchen work will look at:

Supply line condition. Older homes with galvanized steel supply lines often have significant corrosion and scale buildup. Galvanized pipe restricts water flow as it corrodes from the inside, and pipes that are narrow and slow-flowing in the kitchen may be that way throughout the house. If your supply lines are galvanized, a remodel is an efficient time to repipe the kitchen and address the supply.

Drain line condition. Cast iron drain lines in older homes can have corrosion, scale buildup, or partial blockages that aren’t obvious until the line is inspected or creates a problem. A camera scope of the drain line during a remodel tells you what you’re working with before walls go back up.

Shutoff valve condition. Shutoff valves that have sat in the same position for years are prime candidates for failure. Valves under sinks are used rarely and then expected to close reliably when there’s a problem. Replacing old gate valves with new ball valves during a remodel is inexpensive and solves a future emergency waiting to happen.

Water heater proximity. If your water heater is distant from the kitchen, adding a recirculation pump during the remodel can eliminate the long wait for hot water. It’s a much easier addition while the walls are open than after.

Common Kitchen Plumbing Add-Ons

A remodel is also the moment to think about whether you’re spending to get back what you had or spending to make your kitchen better. I tell my guys this all the time. If your faucet breaks and you pay me to put the same faucet back, you walk away feeling like you lost, because you spent money and your life is exactly the same as before. But if you’re already in there with the walls open, sometimes a little more gets you a pot filler over the stove, or a real filtered water line, or a faucet you actually like. You don’t end up with buyer’s remorse, because your kitchen genuinely got better. Giving you those options is a big part of how we work. We’ll always quote you the straight repair too, no pressure either way.

Remodels are also a natural time to add features that would require opening walls or floors at any other point. Homeowners frequently add:

Pot filler faucet. A pot filler is a swing-arm faucet mounted to the wall above the stove, used for filling large pots without carrying them to the sink. Installing one requires running a cold supply line to the wall behind the stove. During a remodel when walls are open, this is a minor addition. After walls are closed, it requires cutting into the finished wall.

Dedicated filtered water line. An under-sink reverse osmosis system or a filtered water dispenser requires a dedicated supply tap and a drain connection. Easy to rough in during a remodel, more disruptive after.

Refrigerator water and ice line. If your new refrigerator has a water dispenser or ice maker and your current setup doesn’t have a water line, a remodel is the time to rough one in.

Dishwasher rough-in. If the existing kitchen doesn’t have a dishwasher, adding one requires a hot water supply connection, a drain connection to the disposal or drain, and in most cases an air gap fitting.

Discuss these additions with your plumber before the walls close. The incremental cost during a remodel when the supply and drain lines are already exposed is a fraction of what the same work costs as a standalone project.

The Permit Question

Kitchen plumbing remodels in Utah generally require a permit when work involves moving or adding supply or drain lines. Cosmetic work, like replacing a faucet or installing a new disposal on an existing drain, typically doesn’t require a permit.

Permits matter for two reasons. First, unpermitted work that involves moving supply or drain lines can create problems when you sell the home. A home inspector who finds evidence of unpermitted work will flag it, and the buyer’s lender may require corrections before closing. Second, permitted work gets inspected, which catches mistakes before walls close.

Ask your plumber directly whether the scope of work requires permits, and work with someone who pulls permits as a matter of course rather than as an option.

Garbage Disposal and Dishwasher Connections

If your remodel includes a new garbage disposal or dishwasher, those connections are typically handled by the plumber as part of the kitchen scope.

Garbage disposals connect to the drain at the sink and require a dedicated electrical circuit. If you’re upgrading from a manual strainer to a disposal, or upgrading to a larger unit, confirm with your electrician whether the existing circuit is adequate for the new unit’s amperage.

Dishwasher drain connections in Utah code require an air gap or a high-loop drain configuration to prevent backflow from the drain into the dishwasher. If your existing setup doesn’t have one, a remodel is the right time to correct it. This is a minor cost during a full remodel and a compliance issue worth addressing.

Realistic Timeline Expectations

Kitchen plumbing work itself is typically quick. New supply connections, drain assembly, and connection to existing lines for a sink in the same location is a half-day to full-day job. Rerouting a drain line or moving supply behind walls takes longer, potentially 1 to 2 days depending on complexity.

Where plumbing creates delays is in coordination with the larger remodel timeline. Plumbing rough-in needs to happen before drywall. Plumbing finish work (faucet installation, disposal, final connections) happens after counters are in. Make sure your contractor or project manager has the plumber scheduled at both stages.

For significant layout changes or homes with older galvanized or cast iron plumbing, budget additional time for discovery work. What looks straightforward on paper sometimes reveals older pipe conditions once walls are open, and dealing with those findings takes priority over staying on the original schedule.

At Rare Breed Plumbing, Heating, and Air, we work on kitchen plumbing and whole remodels throughout Salt Lake, Davis, Utah, Weber, Summit, Tooele, and Wasatch counties and can coordinate with your contractor on timing. Call 385-449-0144 or book a consultation.

Related: Kitchen Plumbing | Whole-Home Repiping | Water Filtration

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