Can i add a half bath under the stairs in my Dieppe bi-level without major plumbing work?

Adding a half bath under the stairs in your Dieppe bi-level is definitely possible, but "minor" plumbing work is relative — you'll still need a licensed plumber and permits, though the scope can be manageable depending on your home's layout.

Most 1970s-1990s bi-levels in Dieppe have their main plumbing stack running through or near the central area of the home, which often puts it reasonably close to under-stair spaces. If your existing stack runs within 10-15 feet of your proposed location, you're looking at a more straightforward installation. The key is whether you can tie into existing drain lines without major excavation or rerouting.

Plumbing requirements include connecting to the main drain stack (typically 3-inch ABS in homes of this era), running a 2-inch drain line for the toilet, and adding supply lines for hot and cold water. In bi-levels, the under-stair area often sits above the basement level, which can actually work in your favor for gravity drainage. You'll need adequate slope (minimum 1% grade) from your new fixtures back to the main stack.

Code and permit considerations are significant. You'll need a plumbing permit from NB Technical Inspection Services (TIS) and the work must be done by a licensed plumber. The Town of Dieppe will also require a building permit since you're adding a bathroom — contact their Urban Planning department at (506) 877-7900. The space must meet National Building Code requirements including minimum ceiling height (6'5"), proper ventilation (exhaust fan vented to exterior), and adequate clearances around fixtures.

Realistic costs in the Dieppe market typically run $8,000-$15,000 for a basic under-stair powder room, assuming straightforward plumbing connections. This includes rough-in plumbing ($2,500-$4,500), electrical for lighting and exhaust fan ($800-$1,200), drywall and finishing ($1,500-$2,500), flooring ($500-$1,500), and fixtures ($1,000-$3,000). If major drain line modifications are needed, add $3,000-$6,000.

Your next step is having a licensed plumber assess your current plumbing layout to determine connection feasibility. They can tell you definitively whether your existing stack location makes this a straightforward project or requires more extensive work. Get this assessment before applying for permits — it'll save you time and help you budget accurately.