Maximum Lot Coverage for Home Additions in Burnaby BC

Yes, the City of Burnaby enforces maximum lot coverage limits that cap the total percentage of your lot that can be covered by all buildings and structures combined, and for most single-family residential zones this limit is approximately 40%. Your proposed addition, combined with your existing house, garage, shed, and any other covered structures, must stay within this cap or you will need a development variance permit.

Lot coverage is calculated as the total horizontal area of all buildings and structures on your lot divided by the total lot area, expressed as a percentage. This includes the main house footprint, any attached or detached garage, carports, covered porches and decks, garden sheds, workshops, and of course your proposed addition. Uncovered decks, open patios, driveways, and walkways are generally not counted toward lot coverage, though some structures like covered hot tub enclosures or pergolas with solid roofs may be included depending on how much coverage they provide.

Burnaby has been undergoing significant zoning changes as part of its response to provincial Bill 44 (Small-Scale Multi-Unit Housing) legislation. The city consolidated its numerous legacy residential zones (R1, R1a, R2, R2a, R3, and many others) into a new R1 SSMUH (Small-Scale Multi-Unit Housing) District. Under this updated framework, the lot coverage limits have been recalibrated to accommodate the potential for multiplexes and additional dwelling units. For a single-family home with an addition, the effective lot coverage limit remains in the range of 40% to 45% for most standard residential lots, though the specific percentage can vary based on your lot size and configuration.

To determine your current lot coverage, you need an accurate site survey showing the footprint dimensions of every structure on your property. Many homeowners are surprised to find that their existing lot coverage is already close to the limit, especially on the smaller lots common in older Burnaby neighbourhoods like Burnaby Heights, Capitol Hill, or the Edmonds area, where lots of 4,000 to 5,000 square feet are common. On a 4,500-square-foot lot with a 40% lot coverage maximum, your total building footprint is capped at 1,800 square feet. If your existing house footprint is 1,400 square feet and you have a 200-square-foot detached garage, you are already at 1,600 square feet — leaving only 200 square feet of room for an addition before hitting the limit.

If your proposed addition would push lot coverage over the maximum, you have several options. The first is to redesign the addition to fit within the limit — perhaps building up (a second-storey addition) rather than out, since a second storey does not add to the building footprint and therefore does not increase lot coverage. This is one reason second-storey additions are popular in Burnaby's denser neighbourhoods where lot coverage is tight.

The second option is to remove an existing structure to free up coverage room. Demolishing a detached garage or large garden shed can create enough headroom for a meaningful ground-floor addition. Some homeowners replace an oversized single-car garage with a more compact structure or incorporate parking into the new addition design to consolidate footprint.

The third option is to apply for a development variance permit (DVP) to exceed the lot coverage limit. A DVP requires a formal application, staff analysis, neighbourhood notification, and council approval. Burnaby will consider lot coverage variances on a case-by-case basis, taking into account factors such as the character of the surrounding neighbourhood, the impact on adjacent properties, the overall density of development on the lot, and whether the variance is minor or significant. A variance of a few percentage points (say, requesting 43% instead of 40%) is more likely to be approved than a request for 50% or more. DVP application fees in Burnaby run approximately $1,500 to $3,000, and the process takes 3 to 6 months including the notification period.

Beyond lot coverage, Burnaby also regulates floor area ratio (FAR or FSR), which is the total floor area of all storeys divided by the lot area. Even if your lot coverage is within limits, your addition may be constrained by the FSR cap. For most residential zones, the FSR limit is approximately 0.50 to 0.60, meaning that on a 5,000-square-foot lot, total floor area across all storeys is limited to approximately 2,500 to 3,000 square feet. This is a separate calculation from lot coverage and can be the binding constraint even when lot coverage is not an issue — particularly for two-storey additions.

Burnaby also enforces setback requirements — minimum distances between buildings and property lines — that can effectively limit how large your addition can be regardless of lot coverage. Typical setbacks in residential zones are approximately 6 metres (20 feet) from the front, 1.5 metres (5 feet) from the side, and 6 metres (20 feet) from the rear. On a narrow or shallow lot, setbacks may be the limiting factor rather than lot coverage percentage.

The most efficient first step is to visit Burnaby's planning counter with a current survey certificate and your addition concept. Staff can quickly tell you your current lot coverage, the applicable maximum, and whether your project fits within the zoning envelope or needs a variance. This preliminary review is free and takes about 30 minutes, and it will save you from investing in detailed design drawings for a project that cannot be built as envisioned.

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