Adding a bathroom in the basement, moving a kitchen sink, installing a laundry room or replacing corroded pipes all require new drain lines. A drain line must have the right slope, venting and connections to work properly and pass inspection. In Markham, basement renovations and second suites are especially common, and good drain planning makes all the difference.
We design and install drain lines that drain properly, are vented correctly and connect cleanly to your existing plumbing.
Drain Line Installation Around Markham
Many Markham homes built in the 1990s and 2000s came with a basement bathroom rough-in from the builder. Homeowners finishing basements often want to use it, but the rough-in may not be in the ideal place for the new layout. We'll check the rough-in and help you decide whether to use it or move it.
Second suites and basement apartments are common across Markham, and they often need a new kitchen, bathroom and laundry. Planning drain lines carefully at the start helps ensure everything drains properly and passes inspection.
Older homes may need new drain lines to replace corroded cast-iron or galvanized pipes. We can replace sections or entire runs, depending on condition.
In some cases, a new drain needs to go below the basement floor. That means cutting and patching concrete, which we'll explain clearly before any work starts.
Building permits are often required for new drain lines, especially for second suites. We work alongside your permit and inspections so the job moves smoothly.
Before walls and floors are closed, we test the new drain lines to make sure everything is watertight.
Good drain installation is invisible once the renovation is done, which is exactly how it should be.
We also think ahead about maintenance. Every new drain run we install includes a cleanout in an accessible spot, so if a line ever needs clearing, a plumber can reach it without opening your new walls or ceilings. It's a small step that saves time, mess and money for years to come.
Signs You Need Drain Line Installation
You may need new drain line installation if:
- You're adding a bathroom or kitchen. New fixtures need properly sized and vented drain lines.
- Your existing drains are corroded. Old cast-iron or galvanized drains may be past repair.
- You're moving fixtures during a renovation. Relocating a sink, toilet or shower requires new drain routing.
- Drains are poorly sloped. Lines with too little slope collect debris and clog.
- You're adding laundry. Washers need adequate drains and venting.
How We Do It
- 1
Plan the layout
We plan drain routes, sizes, slope and venting around your space and existing plumbing.
- 2
Permits
We advise on whether a permit is needed and coordinate with inspections.
- 3
Install
We install drain lines with proper slope, support and cleanout access.
- 4
Connect
New lines tie into the existing stack or main with correct fittings.
- 5
Test
We test the drain system before walls or floors are closed.
Why Choose Markham Plumbing
A drain line has to work for decades. We take the time to plan slope, venting and access correctly so your new bathroom, kitchen or laundry drains well and passes inspection.
- Careful layout planning
- Correct slope and venting
- Inspection-ready work
- Cleanout access included
Drain Line Installation FAQs
Do I need a permit for new drain lines?
New drain lines for bathrooms, kitchens and second suites generally require a building permit. Check with the City of Markham before work begins.
Can you use my builder's basement rough-in?
Often, yes, if it's located where you want the fixtures. We'll check whether it can be used as-is.
What if my basement doesn't have a rough-in?
We can install new drain lines, which may involve cutting the concrete floor. We'll explain what's involved.
Why is venting important?
Vents let air into the drain system so water flows smoothly and traps don't siphon dry, which prevents sewer gas from entering the home.