Setbacks, height, and floor area: the building envelope explained

Three controls that apply at the same time

Setbacks set the minimum distance the building keeps from the front, rear, and side property lines. What remains after subtracting them is the buildable footprint. Height caps how tall the building climbs above grade. Floor area, expressed as a floor space ratio, caps the total interior square footage regardless of footprint or height. A design has to satisfy all three simultaneously, and loosening one rarely frees up room under the others.

This is why a lot's theoretical unit count, based on area and frontage alone, is often higher than what the envelope actually delivers. If setbacks leave a narrow footprint, adding a storey can recover floor area, but only up to the height cap. Once that ceiling is reached, the floor-area ratio still has to be satisfied within whatever footprint and height remain.

How the envelope differs across Vancouver, Burnaby, and Richmond

Vancouver's R1-1 zone sets a base floor space ratio of 0.70, which can rise to 1.0 when the project is registered as secured rental or includes a below-market ownership unit, a meaningful swing on the same lot depending on how it is built. Height under R1-1 runs up to roughly 11.5 metres for multiplex forms.

Burnaby's R1 small-scale district does not use a floor-area ratio at all. Bulk is controlled through setbacks and site coverage instead, with a front principal building held to three storeys and 10 metres and rear buildings lower still. Because there is no FSR backstop, reading the setbacks and coverage correctly carries more weight on a Burnaby lot than it does in Vancouver.

Richmond's RSM zones cap height at two and a half storeys and 10 metres and limit site coverage to 45 percent of the lot, a real constraint on footprint for the low-lying, flood-sensitive lots common in the city.

The 2026 FSR exclusion for near-zero-emission buildings

Vancouver's zoning bylaw excludes up to 19 percent of floor area from the FSR calculation for buildings that meet near-zero-emission standards equivalent to BC Energy Step Code 5. In practical terms, a project designed to that performance level can add floor area that does not count against the base 0.70 or bonused 1.00 ratio, which is a direct design lever for an owner weighing a high-performance build against a standard one.

This exclusion sits alongside, not instead of, the rental and below-market routes to a higher FSR. A project can pursue the Step Code 5 exclusion on its own, or in combination with a secured rental registration, and the two are evaluated separately against the bylaw.

Party walls take real space out of the envelope

The BC Building Code requires a fire separation with a fire-resistance rating of not less than 45 minutes between adjoining multiplex units. Those assemblies have real thickness and usually carry the acoustic separation that keeps one home from hearing its neighbour. The usable interior of each unit ends up smaller than the raw floor-area number suggests, once wall thickness, stairs, and per-unit mechanical space are accounted for.

A floor plan drawn against the raw FSR number without allowing for this loses real livable space once construction documents are finalized. Building the allowance in from the first design pass avoids that late correction.