Question 6 of 10: Definitions of Planning Terms

Question 6: Definitions of Planning Terms (10 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

Five definitions are required for full marks; all eight are given here, each with the working definition, the regulatory basis and the reason a planner cares about it. Two marks per term implies roughly a short paragraph each under exam conditions — a one-line dictionary definition will not earn full marks, and the second mark is usually carried by the regulatory context or an example.

Part (a) — Building envelope. The three-dimensional volume on a parcel within which a building may lawfully be constructed. It is not drawn directly; it is the residue left after the zoning bylaw’s siting and height rules are applied to the lot — front, rear and side setbacks cut in from the property lines, the maximum height caps it, and lot coverage limits its footprint. Registered instruments and mapped constraints shrink it further: a no-build restrictive covenant, a riparian setback, a geotechnical hazard setback, a utility statutory right-of-way, a flood construction level, or an angular plane or shadowing control in a development permit area. On a subdivision plan for a constrained site the envelope is often drawn and registered explicitly, so that the buyer knows before purchase where a house can go. (In building science the same phrase means the physical assembly separating conditioned interior from exterior; in a planning examination the regulatory meaning is intended.)

Part (b) — Heritage district. A geographically defined area, designated by municipal bylaw, containing a concentration of buildings, landscapes or streetscapes whose collective character has recognised heritage value — the value lies in the ensemble, not only in individual landmark buildings. In British Columbia it is created as a heritage conservation area designated in the official community plan under Part 15 of the Local Government Act; in Ontario it is a heritage conservation district designated under Part V of the Ontario Heritage Act with an accompanying district plan. The effect is that alterations, new construction, and often demolition within the area require a heritage alteration permit assessed against adopted conservation guidelines, so that infill and renovation respect the established scale, materials, rhythm and setbacks. Canadian examples include Gastown in Vancouver and the Distillery District area in Toronto. The planning tension is between conservation and change — a district plan that is too prescriptive freezes the area and blocks needed housing, while one that is too permissive erodes the character it was created to protect.

Part (c) — Urban design. The discipline concerned with the physical form and experience of the public realm and the relationship of buildings to it — the scale between architecture, which shapes an individual building, and planning, which allocates use and density. Its subject matter is the street and block pattern, building massing, height transitions, frontage and entrance treatment, the interface between private buildings and the sidewalk, streetscape and landscape, public open space, sightlines and view corridors, sun and shadow, wind, and the legibility and safety of the pedestrian environment. In Canadian practice it is delivered through urban design guidelines adopted under an official plan, through development permit areas for form and character in British Columbia, and through site plan control in Ontario, and it is evaluated by design panels. Its practical importance is that density is accepted or resisted largely on the basis of how it is designed at street level, so urban design is frequently what makes an intensification policy politically achievable.

Part (d) — Flood plain. The relatively flat land adjacent to a watercourse, lake or coastline that is subject to inundation by the design flood — in most Canadian jurisdictions the flood with a 0.5 per cent annual probability of being equalled or exceeded, that is, the 200-year event (Ontario conservation authorities commonly use the greater of the 100-year flood and a regional storm such as Hurricane Hazel). It is normally mapped in two parts: the floodway, the channel and adjacent land conveying the deep, fast flow, where development is generally prohibited; and the flood fringe, the shallower storage area where development may be permitted if it is floodproofed. The regulatory instruments are provincial floodplain mapping and guidelines, a municipal floodplain bylaw, and a specified flood construction level — the minimum elevation of the underside of a floor system, set at the design flood level plus a freeboard allowance — together with setbacks from the natural boundary and often a restrictive covenant saving the approving authority harmless. Two current pressures make this a live examination topic: climate change is invalidating the stationarity assumption behind historical flood frequency analysis, and much Canadian floodplain mapping predates it.

Part (e) — Secondary suite. A self-contained, subordinate dwelling unit located within a principal dwelling — typically a single-detached house — having its own kitchen, bathroom, living and sleeping areas and its own entrance, but sharing the parcel, the title and usually the services with the principal unit. It remains one parcel and one legal title, which distinguishes it from a duplex or a strata unit; it is inside the principal building, which distinguishes it from a laneway or garden suite. Regulation is by zoning bylaw (permitting the use, capping floor area at a proportion of the house or an absolute maximum, requiring an additional parking space, and often requiring owner-occupancy of one unit) and by the building code (fire separation, sound transmission, egress, ceiling height, ventilation). Planners value secondary suites as the least disruptive form of gentle intensification: they add rental supply and mortgage-helper income and use existing infrastructure without changing streetscape character. The recurring implementation problem is the large stock of pre-existing unauthorised suites, and the trade-off between legalising them (safety, tax and record benefits) and the cost of code compliance that legalisation triggers.

Part (f) — Environmental assessment. A structured, legislated process for identifying, predicting, evaluating and mitigating the environmental — and in modern Canadian practice also the health, social, economic and cultural — effects of a proposed project or plan before an irrevocable decision is taken, together with the public and Indigenous participation that informs that decision. Federally it is governed by the Impact Assessment Act (2019), administered by the Impact Assessment Agency of Canada and applying to designated projects; provincially, British Columbia’s Environmental Assessment Act (2018) applies to reviewable projects above defined thresholds and includes consent-seeking processes with participating Indigenous nations, while Ontario’s Environmental Assessment Act also covers municipal infrastructure through the Municipal Class EA process. The generic sequence is project description and screening, scoping and terms of reference, baseline studies, effects prediction and significance determination, mitigation and residual effects, cumulative effects assessment, a follow-up and monitoring program, and a decision. For a municipal planner the practical relevance is that road, water, wastewater and waste infrastructure projects arising from a plan will themselves require assessment, and that the assessment timeline must be built into the capital program.

Part (g) — Minor variance. A small, site-specific relaxation of a dimensional or siting requirement of the zoning bylaw, granted without amending the bylaw, where strict compliance would cause practical difficulty or undue hardship arising from the physical circumstances of the parcel. In Ontario it is granted by the committee of adjustment under section 45 of the Planning Act, which applies a four-part test: the variance must be minor, desirable for the appropriate development of the land, and maintain the general intent and purpose of both the zoning bylaw and the official plan. In British Columbia the equivalent relief is a development variance permit issued by council, or a decision of the board of variance where undue hardship is demonstrated. The limits are the examinable point: this route cannot authorise a use the zone does not permit, and it generally cannot vary density or floor space ratio — those require a rezoning with a public hearing. A typical granted variance is a 0.6 m encroachment of an existing porch into a required 6.0 m front setback; a typical refusal is a request that is “minor” in dimension but would, if granted routinely, defeat the purpose of the standard across the neighbourhood.

Part (h) — Site plan control. A municipal approval power over the detailed design of an individual development site, exercised after the use and density are already established by zoning and directed at how the project meets the ground: vehicular access and internal circulation, parking and loading layout, pedestrian connections, grading and drainage, stormwater management, lighting, landscaping and screening, waste and recycling storage, utility locations, sustainable design features, accessibility, and — where the enabling legislation permits — exterior building design and massing. In Ontario it is section 41 of the Planning Act, applied in designated site plan control areas, with the conditions secured through a registered site plan agreement and financial security; in British Columbia the equivalent is the development permit issued for a designated development permit area under sections 488–491 of the Local Government Act. Its defining characteristic is that it cannot change what is permitted — it cannot be used to reduce density or refuse a permitted use — only how the permitted development is executed. It is the tool that closes the gap between a zoning bylaw, which is necessarily written in general standards, and the site-specific quality of the result.