Your Trusted Local Experts
Basement underpinning and lowering projects are increasingly popular in Toronto. Many older homes feature basements with 6- or 7-foot ceilings, which can feel cramped and impractical. By digging deeper and creating basements with 8-foot or higher ceilings, homeowners unlock a world of possibilities. These upgraded spaces can serve as playrooms, entertainment areas, or even secondary dwelling units that generate additional rental income.
However, basement lowering is a complex project that impacts foundational walls, plumbing, drains, and interior layouts. At Mister Plumber, we specialize in comprehensive plumbing and drain solutions for underpinning projects. Whether you need drain pipe repairs, replacements, relocations, or entirely new installations, we’re here to help.
Our expert plumbers assess each project individually, ensuring proper drainage and plumbing systems are installed to meet your needs. One of the first steps is a sewer camera inspection, which provides critical information about the depth, direction, and condition of existing pipes. Based on this assessment, we recommend the best solution for your project.
Common Plumbing and Drain Scenarios During Basement Lowering
1. Deep Main Drain Line Below the New Basement Floor
When the main drain is deep enough to remain below the lowered floor, it may not require relocation. However, if the existing pipe is an outdated clay model, it’s a smart opportunity to upgrade to durable PVC. With the basement floor already excavated, replacing the main drain is cost-effective and straightforward.
Typically, only branch lines need adjustment, such as relocating or adding connections for new bathroom fixtures, laundry sinks, or kitchen drains.
2. Shallow Main Drain Above the New Basement Floor
If the main drain pipe is too shallow and would emerge above the lowered floor, a sewage pit and pump system is required to handle basement plumbing. In this setup:
• Drains from upper floors are redirected under the ceiling or along the foundation wall.
• A sewage pump lifts waste to the main sewer line, ensuring proper flow by gravity.
• A check valve protects the discharge pipe, eliminating the need for a backwater valve.
• A 3-inch vent pipe must be installed and extended to the roof.
3. Main Drain Just Below the New Concrete Level
If the main drain is shallow but still below the new floor level, you can avoid a sewage pump by strategically placing fixtures like bathrooms, kitchens, and laundry rooms near the front wall. In this scenario:
- Plumbers ensure proper slope calculations for effective gravity drainage.
- A backwater valve is installed to prevent sewer backups.
- In some cases, the outdoor sewer pipe’s slope allows for lowering and replacement, adding extra depth to the indoor drain system while remaining compliant with code.
Why Upgrade Your Plumbing and Drain Systems During Basement Lowering?
Basement lowering provides a rare opportunity to upgrade your entire plumbing and drainage system. Replacing outdated pipes, ensuring proper slopes, and adding modern fixtures can save you from costly repairs down the road.
Trust Mister Plumber for Your Basement Underpinning Project in Toronto
With over 20 years of experience, Mister Plumber is a trusted name among Toronto homeowners. Our professionalism, expertise, and commitment to quality have earned us countless recommendations.
If you’re planning a basement underpinning or lowering project, trust us to handle all your plumbing and drain needs. Call 416-939-1530 or fill out our online request form today to get started. Let us bring your basement project to life!
