Real Estate Market Data Base Year Guide
Real Estate Market Data Base Year Guide: Changing an index base year rescales the index level and does not itself change property prices; focus on growth rates and a consistent series for time comparisons.
Use current official evidence to turn this topic into a clear verification, monitoring or decision step.
A base year is the reference used to scale an index, commonly setting a reference period to a normalized value such as 100. Changing the base can change displayed index levels without changing the underlying price-growth history.
Do not compare raw levels from two differently based series as if a higher number meant a more expensive market. For growth analysis, align dates and use the same official series/version or convert the series to a common reference.
Record metadata with every chart: index name, provider, geography, frequency, base/reference period and download/release date. If the statistical agency revises or rebases the series, that record explains why an old chart may not match a new download.
A base year is the reference level used to express an index. When an official series is rebased, the numerical index level changes even if the underlying economic movement does not. Before joining two tables or calculating long-run change, place them on a compatible base or use published growth rates and document the series version. Never interpret a higher base-year index number as evidence that one market is more expensive than another without checking the definition and coverage.
Real Estate Market Data Base Year Guide — verified fact 2: TÜİK publishes transaction statistics regularly; July 2026 recorded 123,603 home sales, making completed-transaction data analytically different from listing prices.