Want to enlarge a basement window, add a legal basement bedroom, or cut a new door in a foundation wall? That's exactly what concrete cutting is for: we mark, cut with diamond saws, and remove the block — cleanly, without cracking the rest of the wall.
Why enlarge a basement window?
- Code compliance: to declare a basement bedroom, the building code requires an egress window large enough to escape through. Read our building code article →
- More light: a large window transforms a dark basement into living space.
- Resale value: a legally finishable basement increases your home's value.
How the job goes
- Marking the opening (structure checked first)
- Wet diamond cutting — no dust in the house
- Block removed in controlled sections
- Clean edges, ready for the window or door frame
A real job site — cutting into a concrete wall
Cutting the foundation wall
Interior demolition in progressTypical range for a window opening in a poured concrete foundation, depending on size and thickness. Exact price after a free quote. See the detailed pricing guide →
Good to know
Most openings are done in a single day. Concrete block walls are often even faster. A steel lintel may be needed for wider openings — the contractor confirms this during the quote.
Frequently asked questions
How much does a window opening in concrete cost?
It depends on wall thickness, opening size and site access. We break down the real ranges for Ottawa-Gatineau here →
Can I enlarge a basement window to create a bedroom?
Yes, and it is our most common request. To declare a basement bedroom, the code requires an egress window of a minimum size. The exact Ontario and Quebec requirements are here →
Do I need a permit?
In most cases yes: modifying a load-bearing foundation wall requires a municipal permit, and often an engineer's drawing for the lintel. We tell you what applies to your situation before we start.
Will the wall still be structurally sound after cutting?
Yes, provided the lintel is installed correctly above the opening. We cut with a diamond wall saw, which avoids cracks in the rest of the wall, and we work with your contractor or engineer on the support.