Rough-in is one of those renovation terms that comes up early and confuses a lot of people. Understanding what it means — and why it matters for the products you buy — can save you from a common and expensive mistake.
A rough-in refers to the location of plumbing connections — drain pipes and supply lines — installed in the floor and walls before the finished surfaces (tile, drywall) are applied. These connections determine where fixtures can be placed and which fixtures will work in the space.
The toilet rough-in is the most commonly referenced: it’s the measurement from the finished wall to the center of the drain opening in the floor. The standard in Canadian homes is 12 inches, but older homes sometimes have 10-inch or 14-inch rough-ins. Buying a toilet with the wrong rough-in specification means it won’t fit — the tank will hit the wall or the toilet will sit too far from the wall. Always measure before you buy.
Shower rough-ins include the drain location in the floor and the supply line locations in the wall for the valve. Shower valves have a specific depth requirement — the valve body needs to sit at a defined depth behind the wall for the trim to finish correctly. Confirm valve rough-in depth requirements before your contractor sets the framing.
Vanity plumbing rough-ins include the drain stub-out from the wall and the supply line stubs (hot and cold). The height and horizontal position of these need to align with your chosen vanity’s drain and supply connection locations. Measure your existing rough-in and check against your vanity’s spec sheet.
Our team at Vanity Mart can help you cross-reference rough-in specs with product choices. Visit us at 1-90 Frobisher Drive, Waterloo. Call 519-886-3240.
