How much does it cost to add a second storey to a home in the Glebe?

Adding a second storey to a home in the Glebe is an ambitious project, and there is no reliable neighbourhood-level price for it. The cost depends on the existing structure, the size of the new floor, your finishes and any heritage review. As broad perspective only, a full second storey on an Ottawa house can range from roughly $250,000 to $450,000 or more. Treat that as perspective, not a quote.

The cost drivers that matter in an established central neighbourhood:

• Heritage status. Check whether your property is designated or within a Heritage Conservation District. If it is, the City must approve alterations, including construction of additions, and the design may need to respond to the existing streetscape. That review can add design work and time; ask the City for current timelines.
• Zoning. Your zoning sets maximum height, lot coverage and setbacks, so check your property's zone early. Ottawa currently has two zoning by-laws in effect while appeals are resolved. If you need relief, a minor variance application to the Committee of Adjustment costs $3,759 for an urban property in 2026.
• Structure. Older homes may have foundations and walls that were not designed for another storey. A structural engineer must assess them and specify reinforcement before the design is finalized, and that can be a major cost.
• Design. Design fees may be higher where the addition must be sensitive to its surroundings. Ask designers what heritage-area work they have done.

The roof comes off during construction, so the house is open to weather for a period. Ask each contractor how long the house will be exposed, what temporary protection they use and how they schedule around rain.

Mechanical systems often need attention to serve a new floor. Ask for a heat-loss calculation for heating, and have an electrician assess panel capacity. Electrical work needs an ESA notification and is done by an ESA-licensed electrical contractor. Plumbing for an upstairs bathroom adds stacks and venting. Renovations to existing buildings fall under Part 11 of the Building Code, and the new storey itself must meet current requirements.

The building permit fee is $12.75 per $1,000 of construction value (minimum $117), so a $350,000 valuation would be about $4,463. Drawings and engineering are separate. If you're unsure about requirements, contact Building Code Services at buildingpermits@ottawa.ca.

You can browse addition contractors in the Ottawa Construction Network directory at justynrookcontracting.com and compare itemized quotes.

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