The basement stairs feel cramped, so a larger hole upstairs seems like the direct solution. It might help. It also takes floor area from the room above and changes the framing around the opening.
Draw the staircase in section
Ask for the proposed stair, landing, opening, and finished ceiling levels on one drawing. Include finish thicknesses. More daylight through the opening does not automatically create the headroom needed along the walking line.
Weyerhaeuser's engineered-wood field guidance reinforces the need to follow designed framing details. Trimming a joist to make an opening fit is a structural change, not a finishing adjustment.
Walk both rooms on paper
Check the upper room's circulation with the new guard in place. Downstairs, show where the stair ends and how furniture will pass. A generous opening can still deliver people into the side of a sofa.
Coordinate the edge details early
- Where will the new guard attach to the framing?
- Which electrical or mechanical routes cross the proposed opening?
- What ceiling, flooring, and trim repairs are included?
- How will the opening be protected during construction?
Mississauga's inspection stages illustrate the need to arrange review before work is concealed. Confirm the local requirements for your permit and altered stair.
It is worth taking time to judge this renovation by the complete trip between floors. The opening, stair, landing, and adjoining rooms should improve together. An impressive void in the floor is not a useful outcome by itself.