Bay Window and Fireplace Setback Encroachments in Burnaby

Yes, Burnaby's Zoning Bylaw does permit certain architectural projections to encroach into required setback zones, and bay windows and fireplace bump-outs are among the most common permitted encroachments — but each has specific size and location limitations you must stay within. Understanding these allowances can give you valuable additional space in your addition design without triggering a variance application.

Under Burnaby's zoning regulations, bay windows are generally permitted to project into required side and rear yard setbacks by up to 600 millimetres (approximately 2 feet), provided they meet several conditions. The bay window must not extend over more than a specified percentage of the wall length — typically around 30% to 40% of the total wall on which it is located. The projection must be above grade (it cannot extend to the foundation), and it must have windows on at least two of its three exposed faces to genuinely qualify as a bay window rather than a bump-out disguised as one. The bay window encroachment typically applies only to the principal building, not to accessory structures.

These limitations are important because some homeowners and designers attempt to use the bay window allowance to create what is effectively a room extension rather than a true window projection. If the projection is wider than the allowable percentage of the wall, has a solid wall on two of three sides, or extends from floor to ceiling across the full storey height, the building inspector is likely to classify it as a building encroachment rather than a permitted bay window projection, which would require a variance.

Fireplace and chimney projections are also permitted into setback zones in Burnaby, typically up to 450 to 600 millimetres depending on the specific zone. A fireplace bump-out — the portion of an exterior wall that projects outward to accommodate a firebox and flue — is treated as a minor architectural feature rather than a building encroachment provided it stays within the permitted projection distance and does not exceed a specified width (commonly 3.0 metres or less). The chimney above the roofline may project further into the setback as chimneys and flue pipes are generally excluded from setback calculations altogether.

It is worth noting that in Metro Vancouver's seismic zone, exterior masonry chimneys are subject to additional structural requirements under the BC Building Code. A traditional brick or stone chimney projecting from an exterior wall must be properly tied to the building's structure to resist lateral seismic forces. This is not a zoning issue per se, but it affects the design and cost of a fireplace bump-out and is something your structural engineer must address.

Eaves, gutters, and cornices can also project into setback zones in Burnaby, typically by up to 600 millimetres. This allowance is separate from the bay window and fireplace allowances and applies to roof overhangs on any wall of the building. This is particularly relevant for addition design because a generous eave overhang — desirable in Metro Vancouver's rainy climate for protecting walls and windows from moisture — does not consume your setback space.

Uncovered decks, patios, and stairs at or near grade level may also project into rear and side setbacks in certain Burnaby zones, though the rules for these features are more zone-specific than for bay windows. An uncovered deck less than 600 millimetres above grade is often permitted to extend into the rear setback, which can be useful for integrating outdoor living space with a rear addition.

Here is where homeowners commonly run into trouble: stacking multiple encroachments. Having a bay window, a fireplace bump-out, and an extended eave all projecting into the same setback zone is technically permitted if each individual feature complies with its specific rules, but the cumulative visual effect can draw scrutiny from planning staff during the permit review. If the combined projections make it appear that the building is substantially encroaching into the required setback, you may be asked to provide additional justification or reduce one or more of the projections.

The practical value of these encroachment allowances in Burnaby is significant for addition design. On a typical Burnaby lot with a 1.2-metre side setback, a 600-millimetre bay window projection gives you an additional band of space that can make a narrow room feel substantially wider. In a bedroom or living room within your addition, a well-placed bay window not only adds floor area but also brings in natural light and creates architectural interest — both of which enhance the livability and resale value of the space.

Before finalizing your addition design, confirm the specific encroachment allowances for your zoning district at Burnaby's planning counter. Bring a site plan showing the existing building, property lines, and the proposed projections, and ask the planner to confirm which features qualify as permitted encroachments. This verification costs nothing and can prevent expensive redesigns later in the permit process. If your proposed projections exceed the permitted limits, Burnaby's development variance permit process is available, though it adds $1,500 to $3,000 in application fees and 8 to 16 weeks to your timeline.

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