Basement Bathroom Installation in Toronto
Add a fully functional bathroom to your basement with expert plumbing, waterproofing, and finishing. Whether you are building a guest bathroom, supporting a home office, or adding a bathroom for a legal basement apartment, our licensed team handles everything from concrete cutting and drain installation to tile, fixtures, and final inspection.
Expert Basement Bathroom Installation
Adding a bathroom to your basement is one of the most practical upgrades you can make. It adds convenience for guests and family members, supports basement rental suites, and significantly increases your home’s value. Basement bathrooms present unique challenges including below-grade plumbing, moisture management, and limited natural light. Our licensed plumbers and experienced tradespeople handle these complexities with proven techniques and quality materials.
Plumbing Rough-In & Concrete Work
Adding a bathroom to a basement often requires cutting into the concrete floor to install drain lines for the toilet, shower, and sink. Our licensed plumbers carefully saw-cut and excavate the concrete, install properly sloped ABS drain pipes, connect to the main sewer line or ejector pump, and backfill with gravel before pouring new concrete. Every rough-in is inspected and approved before we proceed with finishing.
Precision concrete cutting and excavation
Properly sloped ABS drain installation
Municipal rough-in inspection
Shower & Waterproofing Systems
Basement bathrooms require extra attention to waterproofing because they are below grade. We install complete waterproofing membrane systems on shower walls and floors, use moisture-resistant drywall throughout, and ensure proper ventilation with a high-CFM exhaust fan ducted to the exterior. Shower options include tiled alcove showers, walk-in showers with glass doors, and corner stalls designed for compact spaces.
Full waterproofing membrane system
Moisture-resistant materials throughout
High-CFM ventilation to exterior
Vanity, Toilet & Fixture Installation
We install code-compliant toilets, functional vanities, and reliable fixtures designed for daily use. Vanity options range from compact wall-mounted units for tight spaces to full-width cabinets with storage. Toilets include standard and comfort-height options. All fixtures are connected to properly sized supply lines with shut-off valves for easy maintenance.
Wall-mounted or cabinet vanities
Standard and comfort-height toilets
Individual shut-off valves at each fixture
Lighting, Ventilation & Finishing
Basement bathrooms often lack natural light, making the lighting design especially important. We install recessed LED pot lights for even illumination, backlit mirrors or vanity sconces for task lighting, and dimmer switches for ambiance. Adequate ventilation is critical below grade to prevent mould, so we install high-CFM exhaust fans ducted to the exterior and ensure proper air circulation throughout the space.
Recessed LED and task lighting
Backlit mirrors or vanity sconces
Properly ducted exhaust ventilation
Our Basement Bathroom Installation Process
A structured process ensures your basement bathroom is built right, inspected properly, and ready to use.
Basement Assessment
We evaluate your basement for existing plumbing rough-ins, sewer line depth, ceiling height, and available space. You receive a detailed proposal with layout options and pricing.
Permits & Planning
We submit the building permit application with plumbing drawings, finalize the bathroom layout, and help you select materials and fixtures.
Plumbing Rough-In
Concrete is cut, drain lines are installed, supply lines are run, and the ejector pump is set up if needed. The rough-in is inspected before we close up the floor.
Framing, Waterproofing & Tile
Bathroom walls are framed, waterproofing membranes are applied, and tile is installed on the shower walls and floor. Ventilation ducting is run to the exterior.
Fixtures & Final Inspection
Toilet, vanity, shower fixtures, lighting, and accessories are installed. We coordinate the final inspection and deliver a clean, fully functional basement bathroom.
Basement Bathroom Cost in Toronto
Basement bathroom costs vary based on whether a plumbing rough-in exists, the size and layout of the bathroom, and your finish selections. Here are typical ranges:
$12,000 – $18,000
Toilet, vanity, shower stall, standard tile, basic fixtures
$18,000 – $25,000
Concrete cutting, drain installation, ejector pump, full build-out
$20,000 – $30,000
Toilet, vanity, shower, bathtub, premium tile, upgraded fixtures
$3,000 – $5,000
Sealed basin, pump, check valve, and connection to main sewer line
We provide a transparent written quote after assessing your basement plumbing conditions, available space, and finish preferences. No surprises, no hidden fees.
Why Homeowners Choose Us
Licensed, insured, and backed by a workmanship warranty, we deliver quality renovations with clear pricing and a smooth, stress-free process.
Licensed & Insured Professionals
Every project is handled by fully licensed trades backed by liability insurance and WSIB clearance, so you can build with peace of mind.
Workmanship You Can Trust
We stand behind our work with a 2-year warranty—so your investment is protected long after the project is complete.
Transparent Quotes, No Surprises
Upfront pricing and detailed estimates mean you’ll always know what to expect—no hidden fees, no guesswork.
Frequently Asked Questions
Clear answers to the questions Ontario homeowners ask most.
How much does a basement bathroom installation cost in Toronto?
Do I need to break the concrete floor to install a basement bathroom?
Do I need a sewage ejector pump for a basement bathroom?
Do I need a permit to add a bathroom in my basement in Ontario?
How long does a basement bathroom installation take?
Locations
We service the following locations throughout the GTA.
Have a dream project?
Trust our expert contractors at Leo Constra to make it happen—exactly how you envision it.