Kitchens concentrate more mechanical work into a small area than any other room in a house — drainage, supply, gas, filtration and several appliances that all need to be roughed in before the cabinets arrive.
AT A GLANCE
- Rough-in timing
- Before cabinets, against the final cabinet drawings
- Gas range upgrade
- Often needs the line upsized, not just extended
- Island sink
- Requires specific venting, which drives the design
- Permit required
- Yes where gas or drainage is modified
Rough-in against final drawings
The most consequential thing in a kitchen remodel schedule is that rough-in happens against the final cabinet layout. Not the design concept, not the preliminary drawing — the drawing the cabinets are actually being built from.
The reason is unforgiving. A sink base cabinet that moves three inches during value engineering moves the drain, and the drain is inside a wall or a floor that will have been closed by then. Catching it early costs an hour. Catching it late costs opening finished work.
We ask for the final cabinet drawings and the appliance specification sheets before rough-in, every time.
The island question
If the sink is going in the island, the venting method has to be resolved during design rather than during construction. An island sink has no wall above it to run a conventional vent through, and the alternatives each have requirements that interact with your floor structure and joist direction.
This is not an obstacle so much as an early decision. It just needs to be made while the island location is still on paper.
Gas capacity, not just gas access
Going from electric to gas cooking is one of the more common remodel upgrades and one of the more commonly under-scoped. Running a gas line to the range location is the visible part. The part that determines the price is whether your existing gas system has the spare capacity to feed it.
Every appliance draws from the same supply. Adding a high-BTU range to a system already running a furnace, water heater and dryer can push the total past what the existing pipe size delivers at adequate pressure. That calculation happens before we quote.
WHAT'S INCLUDED
- Flat-rate quote for the full plumbing and gas scope
- Rough-in set against final cabinet and appliance drawings
- Gas load calculation across the whole house before adding a range
- Correct island venting where a sink moves to an island
- Permit pulled and inspections coordinated
- Appliance connections, trim-out and leak testing
COMMON QUESTIONS
Can I put the sink in the island?
Yes, but it is the single decision that most affects the plumbing scope, because an island sink cannot be vented the ordinary way — there is no wall to run a vent up. Code provides specific solutions for this, and which one applies depends on your floor structure and layout. It is worth settling early, because it can influence where the island goes.
I am switching from an electric range to gas. Is that straightforward?
It needs a gas line, and the real question is whether your existing gas system has the capacity. Adding a range means recalculating total demand across the furnace, water heater, dryer and anything else on the system. Sometimes the existing line serves it. Sometimes a section needs upsizing. We work that out before quoting so the number does not move later.
When do you need to be on site during a kitchen remodel?
Twice. Rough-in happens after demolition and before drywall and cabinets, and it has to be set against the final cabinet drawings — not preliminary ones — because a cabinet run shifting three inches moves where the drain has to be. Then trim-out happens after countertops are templated and installed.
Do I need a dedicated line for a pot filler or filtered water?
A pot filler is a supply line run to the wall behind the range, which is straightforward if it is planned before the wall closes and disruptive afterwards. Filtered water depends on the system — an under-sink filter needs only space and a tap, while whole-house filtration is a separate job at the point water enters the house.
Will my old drain handle a new disposal?
Usually, though older drain lines and the trap arm sometimes need updating, and this is a good moment to do it while everything is open. A disposal also needs a switched electrical connection under the sink, which is an electrician's work if one is not already there. We will flag it before the quote rather than after.