Methodology
How this record is built
Every number on this site traces to a published source, joined at exact grain. Where a source is silent, this site is silent. This page explains exactly how, so you can judge the record rather than trust it.
01
What a record on this site is
The unit of this site is the City of Calgary industrial assessment account. There are 6,205 of them, sitting on 3,637 parcels. An account is not a building: industrial condominium bays are individually assessed, and one building can carry many accounts.
Each record is a set of observations from named sources at a stated grain — not a set of conclusions about a property.
02
How the sources are joined
| Relationship | Join method | Why |
|---|---|---|
| Assessment history → property | Exact assessment roll number, at assessment-account grain | Roll number is a stable key the publisher maintains; nothing is inferred |
| Building permits → property | Exact normalised civic address, no proximity fallback | A fuzzy match creates false history, which is worse than no history |
| Development applications → property | Exact normalised civic address, no proximity fallback | Same |
| Land-use district → property | Designation code published on the assessment record | Joined to The City's published district definitions |
| Truck route → property | Calculated point-to-nearest-published-line distance | Arithmetic on published geometry; no routing engine |
03
Derived figures, and how they are derived
- Assessed value change (year over year, 3-year, 5-year, since first observation). Arithmetic difference between two published assessed values on the same roll number.
- Assessed value per land square foot. Published assessed value divided by published parcel area. It is not a land price, a rate per buildable foot, or a rent.
- Medians, totals and counts across areas, streets, districts, size bands and eras. Plain aggregation over the accounts in each group.
- Matched-panel assessment index. For each pair of consecutive roll years, only accounts observed in both years are compared; the median ratio is taken and chained into an index. This exists because The City's current-year and historical assessment layers publish different account coverage, and comparing raw medians across that boundary reads a coverage change as a value change.
- Size bands and construction eras. Deterministic bands over published parcel area and published construction year.
- Street and quadrant keys. Parsed from the published civic address, with unit prefixes stripped so that suite-prefixed addresses group onto the correct street.
04
Rules this site follows without exception
- A source record is an observation at a retrieval time, never a property fact.
- Absence is never a zero. No published construction year means unknown, not "old". No permit record means no matching record, not "nothing happened". No availability record means unknown, not "occupied".
- Nothing is estimated, modelled or filled in. There are no imputed rents, no modelled vacancies, no inferred owners or tenants, no predicted values.
- A code is reported without an asserted meaning until its definition is joined and validated. Calgary's sub-property use codes are shown exactly as published; the City's separate classification reference data is not yet joined in this build.
- Reachability of a source is not a right to reuse it. Every source used here is licensed for reuse, and the licence is recorded.
- No MLS® System or CREA DDF content is used anywhere on this site.
05
Known limits
- A civic address is not a property key. One Calgary address can cover many separately assessed parcels. Address-matched permit records therefore attach to each of those accounts.
- Building floor area, clear height, dock count, power service and sprinkler design are not published in any City of Calgary open dataset used here, so they do not appear on this site at all.
- 180 accounts have no published construction year and 58 have no historical assessment observations.
- Permit and development counts reflect the records retained per property, so they describe recent activity rather than a complete historical register.
- Statistics Canada series on the market pages are metropolitan or provincial aggregates and cannot be attributed to any individual property.