Can my existing bungalow in Nepean support a second-storey addition?

Many bungalows can take a second storey, but whether yours can, and how much reinforcement it would need, depends on how it was built and what it sits on. Nepean has homes from several decades, built to different standards, so a structural engineer's assessment is the essential first step before design gets underway.

The main concern is the foundation. A bungalow's footings and walls were designed for one storey plus a roof, and a second storey adds significant load. An engineer will look at the footing size, the wall construction (poured concrete or block), reinforcement and condition. If the foundation needs strengthening, options include underpinning or adding piles or interior supports. The cost depends on your house and soil, so ask for an itemized structural line in every quote and a written fee quote for the engineering itself.

Soil matters. Parts of the Ottawa area have sensitive clay, known as Leda clay, and on filled ground, peat or sensitive clay the Building Code requires footing sizes to be engineered. Existing cracks or uneven settlement need to be understood and resolved before you add weight. Under the Code, footings on 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; your engineer can tell you whether your existing footings meet what the new design needs.

Above the foundation, the floor framing and load-bearing walls also need evaluation. Some framing can carry the new loads with the right engineering, while some needs sistering or new beams. The engineer works out a continuous load path from the new roof down to the foundation and puts it on the drawings.

A second-storey addition needs a building permit; permit fees for additions are $12.75 per $1,000 of construction value, minimum $117, with the City confirming the valuation. Your zoning sets maximum height, lot coverage and setbacks, so check your property's zone. Ottawa currently has two zoning by-laws in effect, 2008-250 and 2026-50, while appeals are resolved.

Total cost depends on size, structure, mechanical changes and finishes, and the heating and cooling system often needs rework since it was designed for one storey. Treat any figure you hear as perspective and ask for itemized quotes.

Don't skip the engineering to save money; it's what protects you from expensive surprises. To compare contractors who have done second-storey work on similar homes, browse the Ottawa Construction Network directory.

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

• 613Bins
• JC Carpentry
• ALTIOR CONSTRUCTION
• Elie The Carpet Guy Inc.
• The Deck Store Inc