Can I move plumbing during a kitchen renovation in New Brunswick and what does it cost?

Yes, you can absolutely move plumbing during a kitchen renovation in New Brunswick — it is a routine part of kitchen layout changes — but it requires a licensed plumber, a TSANB plumbing permit, and a TSANB inspection before the walls or floor are closed. The cost to relocate a kitchen sink typically runs $1,500–$4,000 for a straightforward move within the same wall, or $3,500–$7,000+ for moves across the kitchen to an island, peninsula, or entirely different wall.

The cost range is wide because it reflects how far and how complex the move is. Moving a sink 12 inches along the same wall — to better centre it under a new window, for example — may require only minor drain slope adjustment and a short supply line extension, adding $1,500–$2,500 to the project. Moving the sink from an exterior wall to a kitchen island in the centre of the room is a fundamentally different operation: the drain must run under the subfloor (or through a basement ceiling if accessible below), maintaining the required 1/4-inch-per-foot slope to the stack, and supply lines must be extended and properly insulated against NB's cold winters if they run through an unheated space. This type of move runs $3,500–$7,000+ depending on the home's construction and the below-floor accessibility.

For NB homes with an accessible basement below the kitchen — which covers most detached and semi-detached homes in Fredericton, Moncton, Saint John, and throughout the province — plumbing relocations are significantly easier and less expensive than in homes built on a slab or with a crawlspace. A plumber can access the drain stack from below, cut in a new connection, and run the new drain line without demolishing the kitchen subfloor. In a slab-on-grade kitchen, moving the drain requires cutting through concrete — which adds $500–$2,000 in concrete cutting and repair costs on top of the plumbing work itself.

The drain slope is the critical technical constraint in any plumbing relocation. Kitchen drains must maintain a 1/4-inch drop per foot of horizontal run to drain properly without clogs. The further you move the drain from the stack, the more drop you need — which is finite. An island sink on the opposite side of the kitchen from the main stack may need a 6-inch drop over a 24-foot run, which means the drain line eats significantly into your basement ceiling height. In homes with low basement ceilings (a common reality in older NB construction), this can require creative routing or even an under-sink pump system — an additional $500–$1,500 expense.

Supply lines (hot and cold water) are the easier part of any plumbing move. Copper or PEX supply lines can be extended or rerouted through walls and floors with relative ease. In NB, PEX tubing has become the dominant supply-line material for renovations because it is flexible, frost-resistant (an important consideration for any NB exterior wall run), and fast to install. Any supply line running through an exterior wall or unheated space in an NB home needs proper insulation — frozen kitchen supply lines in a Saint John or Edmundston winter are a genuine risk in inadequately insulated exterior wall runs.

A TSANB plumbing permit is required for any drain relocation, new rough-in, or supply-line modification beyond simple fixture swaps. Your plumber applies for the permit and manages the inspection. The inspection must happen before walls or floors are closed — a rough-in inspection verifies proper slope, connection to stack, and supply line installation before the work is hidden. Budget the permit fee into your project: TSANB plumbing permits typically run $100–$300 depending on scope.

Always hire a licensed NB plumber for kitchen plumbing work — unlicensed plumbing work will not pass TSANB inspection, voids your home insurance for water damage claims in the renovated space, and creates headaches at resale when the absence of permits surfaces in a home inspection.

---

Looking for experienced contractors? The New Brunswick Construction Network connects homeowners with qualified professionals:

• Gionetterenovations
• Thirty Four Renovations