Section 01
What lot grading is, and which record answers which question
Lot grading is the shaping and sloping of land so that surface runoff moves away from buildings and toward a City right-of-way. It is a surface-water discipline and it is distinct from the buried drainage system, from the building envelope and from the compliance review of a survey. Confusing those four is the origin of most drainage arguments.
Three records recur. An approved or accepted grading plan states the intended design. A lot grading certificate or inspection approval records that the constructed grade was reviewed against it. A survey with a City Compliance Certificate Report answers siting against the Zoning Bylaw and permits, which is a different question again and never a drainage finding.
Section 02
The Infill Lot Grading Plan for new work
The City requires an Infill Lot Grading Plan for proposed development in a mature neighbourhood, submitted to support the development and building permit applications. For single and semi-detached development the proposed plan must be submitted with the development permit application and accepted by the City before the development permit and building permit issue.
Row house development of three units or larger follows a different route: the proposed grading plan, a site mechanical plan and stormwater management calculations go to EPCOR for infill water and sewer servicing review before the grading plan is forwarded to the City for final review and acceptance. The requirement is therefore project specific and permit specific, and the applicable path depends on what is being built.
Requirements are tied to the proposed development. They are not a retrospective standard applied to a house that already exists.
Section 03
Documented: what a grading record establishes
Where an accepted plan and a subsequent certificate both exist, you can establish the design intent and that the constructed grade was reviewed. For recent infill this is often a complete chain and it is genuinely useful evidence for a purchaser.
You can also establish the regulatory frame regardless of the parcel: Drainage Bylaw 18093 came into effect at the start of 2018, replacing the previous bylaw, and regulates lot grading, surface runoff and site servicing for roof and foundation discharge for any property within the City. The City states that although the bylaw came into effect in 1997, the standards are enforced retroactively for all properties.
Section 04
Not documented: the ordinary state of a mature lot
Many mature-neighbourhood properties have no approved Lot Grading Plan at all, and some with approvals were developed before the lot grading approval programme existed. For most older houses, therefore, the honest research finding is that no plan is on file.
That finding tells you nothing about whether water currently behaves acceptably. Grading issues develop slowly — settlement at foundation walls is the City's own example — and become evident after rainstorms or during snow melt. Conversely, a paper record from decades ago says nothing about the grade today after landscaping, a new patio, a fence line or a neighbour's redevelopment.
Section 05
Verify next: an observation-led sequence
Because the paper is thin, observation carries more weight here than elsewhere. Walk the lot in wet conditions if the calendar allows, or during snow melt, and look at window wells, the base of downspouts, the patio edge nearest the house, low corners and the line to the lane or street. Photograph what you see, dated.
Then ask the City what grading records exist for the address, ask the seller for any certificate, approval drawing or correspondence, and ask whether re-grading, retaining structures or extensive hard landscaping have been added since the house was built. Re-grading and redevelopment can create runoff issues or reveal existing ones, so recent site work raises the priority of the question rather than settling it.
Section 06
Owner and seller evidence pack
Hold the accepted grading plan and any certificate, dated photographs across seasons, invoices and drawings for landscaping and retaining work, eavestrough and downspout arrangements including extensions past the foundation, sump and weeping tile information where known, and any correspondence with the City or a neighbour.
A seller with this pack can answer a drainage question with evidence. Without it, a purchaser is left with an unresolved item that will be handled as a contract condition or a price argument, which is a poor trade for the modest effort of assembling the folder.
Section 07
Escalation and the neighbour dispute route
The City's stated route for an unresolved neighbour issue is to talk first, then contact it to register a complaint. Development Services sends an information guide for lot grading issues together with a witness statement form; on receipt, a lot grading inspector examines conditions on both properties to identify bylaw violations, and non-compliance notices follow infractions of the Drainage Bylaw.
Beyond that route, engage a professional engineer or a qualified grading contractor for design, a foundation or drainage specialist where water has reached the building, and a lawyer where damage has occurred or where the dispute concerns a boundary or an easement. Owners remain responsible for grading on their own property throughout.
Nothing here determines whether any property complies with the Drainage Bylaw. That determination belongs to the City.