Is a bump-out big enough to add a dining area to my kitchen in Ottawa?

A bump-out can create enough room for a dining area in your kitchen. Whether a small cantilevered extension is enough, or you need a larger foundation-supported one, depends on how many people you want to seat and how much room you need to move around the table.

The arithmetic is simple. Multiply the depth of the bump-out by the length of wall it spans to get the floor area you gain. A shallow bump-out across a long wall can be enough for a built-in banquette or a small round table, which is often all it takes to turn a cramped galley or L-shaped kitchen into a place where the family can eat together.

A full table seating six or more needs more depth, plus clearance for chairs and walking room behind them. At that depth you will likely be beyond what the existing framing can cantilever, and the extension will need piers or a foundation. That means excavation, footings and waterproofing, which add cost and time. 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.

As perspective rather than a quote, a small cantilevered dining bump-out and a larger foundation-supported one sit in quite different budget brackets, and finishes, glazing, and any plumbing or electrical changes move the number further. Ask contractors for itemized quotes on both options so you can compare.

Windows are often the best part of a dining bump-out, and a garden door can connect the kitchen to the yard. New windows in an addition have to meet the energy requirements in the Building Code, so ask your designer how the glazing affects the energy compliance path for the addition.

One strategy that works well is combining the bump-out with a reconfigured kitchen. Moving the eating area into the bump-out frees interior space for a larger island or more counter workspace, which can give you more usable kitchen than expanding the whole room evenly.

A bump-out is an addition, and the City of Ottawa lists additions among projects that need a building permit. Permit fees are $12.75 per $1,000 of construction value (minimum $117). If you are unsure what applies, contact Building Code Services at buildingpermits@ottawa.ca. For design options that fit your home, compare itemized quotes from contractors in the Ottawa Construction Network directory.

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