Can I remove a load-bearing wall to connect my addition to my Ottawa home?

In most cases, yes, a load-bearing wall can be removed or opened up to connect an addition to your home, but it takes proper engineering, a permit and careful execution. The City of Ottawa lists structural alterations and adding or removing walls among projects that need a building permit. Expect the structural work to be a separate, significant line in your budget, and ask for it to be itemized.

The process starts with a structural assessment. An engineer or qualified designer works out what the wall carries: roof loads, second-floor loads if any, and the snow load on the roof, which is a major design load in Ottawa. From that, they specify the beam size and material, where it bears, and how it connects. Those details go on the drawings submitted with your permit application.

Before the wall comes down, your contractor installs temporary shoring to hold up everything the wall currently supports, usually temporary posts and beams on both sides. Shoring is not something to improvise. Ask your contractor how they will shore the work and keep it in place until the permanent beam is carrying the load.

The permanent beam depends on span and load. Shorter openings can often use built-up engineered wood beams that a crew can lift by hand. Wider openings may need steel, which can require a small crane or boom truck to place. Either way, the beam sits on posts or columns at each end that carry the concentrated load down to the foundation.

What happens below those posts is just as important. Many existing footings were designed for the spread-out load of a wall, not the point load of a post. The engineer may specify a new pad footing under each post, which means cutting the basement floor, excavating and pouring concrete. Under the Ontario Building Code, footings in clay or soils that are not clearly defined must be at least 1.2 m deep and not less than the depth of frost penetration.

Services inside the wall have to move first. Load-bearing walls often contain wiring, ducts, plumbing and sometimes gas lines. Electrical work needs an ESA notification or permit, done by an electrical contractor licensed by ESA. Gas line changes are done by a TSSA-certified gas technician. Plumbing alterations are covered under the building permit, and plumbing is a compulsory trade. Ask your contractor to open small inspection holes before finalizing the plan so there are no surprises.

To compare contractors who handle structural openings, request itemized quotes through the Ottawa Construction Network directory and ask each to walk you through their shoring and beam plan.

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Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:

• Luxe Painting and Renovations
• JC Carpentry
• BFI Renovations
• Transitions Renovations
• The Granite shop