How much does it cost to relocate plumbing for a kitchen extension in Ottawa?

Relocating plumbing is often one of the more involved parts of a kitchen extension. As broad perspective only, plumbing relocation for a kitchen extension can range from roughly $8,000 to $25,000, depending mostly on how far the new sink moves from the existing drain stack and whether drains must run under a basement slab. Treat that as perspective, not a quote.

The drain line is usually the costliest piece. Kitchen drains need a continuous slope to the stack, and the Building Code sets the size and slope; your plumber and designer will confirm them. If the new sink is far from the main stack, the plumber may need to run a new drain through the floor framing or trench under the basement slab. Trenching means cutting and patching concrete, and on clay soils the new pipe needs proper bedding so it doesn't settle.

Water supply lines are generally simpler to extend. Ask which piping material your plumber proposes and why, especially if you are tying into existing lines.

Venting is easy to overlook. Every fixture drain must be vented so trap seals aren't siphoned. If the new sink is too far from an existing vent, a new vent may have to run up through the walls and roof, which involves roofing and flashing. In some situations an air admittance valve may be acceptable, but that is for your plumber and the City's inspector to determine.

Gas lines for a range or cooktop are installed by a TSSA-certified gas technician. Ask whether the existing gas line can be extended or needs re-routing from the meter.

Who does it. Plumbers are a compulsory trade in Ontario, so the person doing the work must be authorized. You can check this on the Skilled Trades Ontario Public Register.

Permits. The City's list of permit projects includes "Plumbing - alterations, additions or extensions to a plumbing system (except replacing existing fixtures)". For an extension, plumbing is usually part of the addition's building permit. Fees are $12.75 per $1,000 of construction value (minimum $117). Rough-in plumbing is inspected before walls are closed. Ask the City for current timelines.

One of the best ways to control cost is to design the kitchen so the sink wall sits close to the existing stack, even if the layout isn't quite your first choice. Every metre of extra drain adds work. Discuss this with your designer and plumber early. You can browse addition and renovation contractors in the Ottawa Construction Network directory at justynrookcontracting.com and compare itemized quotes.

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