Basement renovation
A Basement That Feels Like the Rest of the Home.
Home Renovation Contractors finishes and renovates basements across Greater Montreal, Laval, Longueuil and the North and South Shores.
A basement is often the most affordable way to gain living space because the structure already exists. The work that matters most happens before the drywall: checking for moisture, insulating below-grade walls correctly and planning electrical and plumbing.
In 2026, finishing a basement in Canada typically costs about $60 to $110 per square foot, roughly $85 on average for standard finishes; bathrooms and suites add to that.
Basement projects often include interior renovation, flooring, electrical and plumbing and insulation and soundproofing.
When it is time
Signs Your Basement Is Ready for a Renovation.
Most basements are finished once the family needs more space, but some signs mean it should be done properly now.
Space you never use
A cold, dark lower level that only stores boxes.
Musty smell or damp walls
Signs to deal with before any finishing work.
Old panelling or carpet
Dated finishes that hold dust and moisture.
Low or uneven ceilings
Ducts and beams that can be boxed in cleanly.
No bathroom downstairs
A lower-level bathroom changes how the home works.
Need for a home office
A quiet, separate workspace away from the main floor.
What we build
Basement Renovation Services.
From the slab to the finished ceiling, one coordinated team handles every stage.
Basement finishing
Framing, insulation and vapour control suited to below-grade walls, drywall, ceilings, doors and trim.
✓ A warm, dry lower level.
Basement bathrooms
New drains, a pump where needed, waterproofing and ventilation, by licensed plumbing and electrical trades.
✓ A full bathroom where you need it.
Bedrooms and offices
Rooms with code-compliant exit windows, smoke and CO detectors, and quiet doors.
✓ Rooms that pass inspection.
Below-grade flooring
Choosing Flooring for a Basement.
Basement floors sit on concrete and face cooler temperatures and possible moisture.
| Flooring | Strengths | Watch for |
|---|---|---|
| Luxury vinyl plank | Water-resistant, warm, affordable | Needs a flat subfloor |
| Engineered wood | Real wood look, stable | Needs a moisture barrier |
| Porcelain tile | Unaffected by moisture | Cold without radiant heat |
| Carpet | Warm and quiet | Not for areas at risk of moisture |
Solid hardwood is generally not recommended below grade.
Step by step
How a Basement Renovation Unfolds.
The right order keeps finishes dry and inspections simple.
Visit and moisture check
We look for cracks, water marks and drainage issues and discuss how you will use the space.
Written scope and permits
Rooms, finishes and options listed; permits requested where required.
Protection and demolition
Dust barriers, removal of old finishes and any moisture corrections.
Framing, plumbing and electrical
Walls, drains and circuits installed by licensed trades.
Insulation and inspections
Below-grade insulation and vapour control, inspected before closing walls.
Drywall, floors and paint
Ceilings, flooring, doors, trim and paint.
Walkthrough
Every room reviewed together before handover.
Before you compare quotes
What Drives the Cost of a Basement Renovation.
In 2026, finishing a basement costs about $60 to $110 per sq. ft. in Canada. These factors move your project within that range.
Moisture work
Crack repairs, drainage or waterproofing add cost but protect everything else.
Size and layout
More rooms means more walls, doors and electrical.
Bathroom
Below-grade drains and pumps are the biggest single add-on.
Ceiling height
Low ceilings limit options; lowering a floor is costly.
Windows
Bedrooms need code-compliant exit windows.
Finishes
Flooring, millwork and lighting choices.
How much does it cost to finish a basement in Montreal?
In 2026, finishing a basement typically costs about $60 to $110 per square foot in Canada, roughly $85 on average for standard finishes. Bathrooms and suites cost more.
Do I need a permit to finish my basement?
In most cases yes, especially for new rooms, plumbing or a suite. We confirm the requirements with your borough or city.
Can I add a bedroom in the basement?
Often yes, if the room has a window that allows emergency exit and the ceiling height meets the code, plus smoke and CO detectors.
What if my basement has moisture?
Moisture is corrected first: cracks, drainage and grading. Finishing over a water problem traps it behind the walls.
What flooring is best for a basement?
Luxury vinyl plank, engineered wood with a moisture barrier, or porcelain tile. Solid hardwood is not recommended below grade.
How long does a basement renovation take?
Usually several weeks; projects with a bathroom, suite or moisture repairs take longer.
Get started
Planning a Basement Renovation?
Tell us how you want to use the space, its approximate size and any moisture history. We will come back with a clear, itemized estimate.
- Approximate size and ceiling height
- Photos of the current basement
- How you want to use the space
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