How much does a plumber charge to rough-in a new bathroom in Calgary?

A plumbing rough-in for a new bathroom in Calgary typically costs $2,500 to $5,000, depending on the bathroom layout, number of fixtures, distance from existing plumbing stacks, and whether the work is in a basement, main floor, or upper level. A basic three-piece bathroom (toilet, sink, and shower or tub) on a concrete basement slab is at the higher end due to concrete cutting, while a rough-in on a framed upper floor with nearby stack access tends to be less expensive.

The rough-in includes all the behind-the-wall and below-floor plumbing work that happens before fixtures are installed. This means running water supply lines (hot and cold) to each fixture location, installing drain and waste lines with proper venting to the main stack, setting the toilet flange, positioning shower and tub drains with the correct slope, and stubbing out supply and drain connections for the sink. In Calgary, most plumbers use PEX for water supply lines because it handles the extreme temperature fluctuations caused by chinook winds better than rigid copper — PEX can expand slightly without cracking if temperatures drop suddenly, which is a real concern for plumbing in exterior walls during Calgary's harsh winters.

For basement bathroom rough-ins, which are the most common new bathroom additions in Calgary homes, expect additional costs for concrete cutting and removal. Breaking through a concrete basement slab to install drain lines typically adds $800 to $2,000 to the project, depending on the distance from the existing main drain and how much concrete needs to be cut. If your home has a rough-in already stubbed into the basement slab (common in many Calgary homes built after the mid-1990s), your costs drop significantly — connecting to existing stubs runs $1,500 to $3,000 instead of the full $2,500 to $5,000 range. Check your home's original blueprints or have a plumber inspect the basement to determine whether pre-installed rough-in stubs exist.

Venting is a critical and often underestimated component of the rough-in cost. Every fixture needs proper venting to prevent siphoning of trap seals, which would allow sewer gas into your bathroom. If the new bathroom is far from an existing vent stack, the plumber may need to run a new vent through the roof or use an air admittance valve (AAV) where permitted by the Alberta Building Code. Running a new vent stack through the roof adds $500 to $1,500 depending on routing complexity.

A plumbing rough-in for a new bathroom always requires a plumbing permit from the City of Calgary. Your plumber applies for the permit (typically $150 to $350), completes the rough-in, and then a Safety Codes Officer inspects the work before walls are closed and concrete is patched. This inspection ensures proper pipe sizing, adequate slope on drain lines (typically 1/4 inch per foot), correct venting, and code-compliant connections. Never allow a contractor to close walls or pour concrete over plumbing before the inspection — if unpermitted work is discovered at resale, you may be required to tear everything open for inspection at your expense.

Plumber hourly rates in Calgary run $95 to $150 per hour, but most plumbers quote rough-ins as a fixed price based on the scope rather than hourly. Get at least three quotes and verify that each plumber carries WCB Alberta coverage and adequate liability insurance. A rough-in is the foundation of your entire bathroom — errors here cause leaks, sewer gas issues, and code violations that are extremely expensive to fix once the bathroom is finished. Find qualified plumbing contractors through the Calgary Construction Network at calgaryconstructionnetwork.com.

---

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

• Greenstone landscaping solutions
• True North Overhead Doors
• Allure Residential & Commercial inc
• Calgary Custom Concepts
• Premium Built Structures