How often should bathroom supply lines be replaced in a Calgary home?

Bathroom supply lines should be inspected annually and replaced proactively every 8 to 12 years for standard braided stainless steel lines, or immediately if you notice any signs of corrosion, bulging, cracking, or moisture at the connections. Supply line failure is one of the most common causes of catastrophic water damage in Calgary homes, and replacing them during a bathroom renovation is inexpensive insurance against a devastating flood.

The type of supply line determines its lifespan. Braided stainless steel supply lines — the most common type connecting your faucets and toilet to the shut-off valves — have a typical service life of 8 to 12 years. The braided stainless exterior protects a rubber or polymer inner hose, and over time this inner hose degrades, becomes brittle, and can burst without warning. Solid copper supply lines (found in many Calgary homes built before the 1990s) can last 50 years or more but develop pinhole leaks from internal corrosion, especially with Calgary's hard water. PEX supply lines (increasingly common in newer construction and renovations) have an expected lifespan of 40 to 50 years and resist Calgary's hard water and temperature extremes better than copper.

Calgary's extreme temperature swings put additional stress on supply line connections. Chinook winds can shift outdoor temperatures by 20 to 30 degrees Celsius in hours, and bathrooms on exterior walls experience thermal cycling that stresses fittings and joints. Homes that sit vacant during extended winter vacations are at particular risk — if heating fails while you are away and temperatures inside drop below freezing, supply lines (especially older rubber-core braided lines) can freeze and burst, causing massive water damage. If you travel during Calgary winters, consider installing quarter-turn shut-off valves on all bathroom supply lines so you can easily turn off water to individual fixtures before leaving.

Replacement is quick and affordable. A pair of braided stainless steel supply lines for a bathroom faucet costs $15 to $30 at any Calgary hardware store, and toilet supply lines run $10 to $20 each. A plumber can replace all the supply lines in a bathroom — two for the faucet, one for the toilet — in under an hour, costing $100 to $200 for labour plus parts. During a bathroom renovation, your contractor should replace all supply lines as a matter of course, even if they appear to be in good condition — the cost is negligible compared to the risk of a supply line failure six months after your beautiful new bathroom is finished.

Signs that supply lines need immediate replacement include visible rust or discolouration on the braided exterior, any moisture or dripping at the connections (even a slow weep), a bulge or blister in the line, green corrosion on copper connections, or lines that feel stiff and brittle rather than flexible. If your supply lines are original to a home built more than 15 years ago and have never been replaced, schedule replacement regardless of their appearance — internal degradation is not always visible from outside.

Replacing supply lines in the same location using existing shut-off valves is a like-for-like swap that does not require a permit. However, if the shut-off valves themselves need replacement (common in older Calgary homes with gate-style valves that seize open over time), a plumber should handle the valve replacement, and a plumbing permit may apply depending on scope. Always verify your plumber's WCB Alberta coverage before work begins.

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