The English Indices of Deprivation (IoD) have now been updated for 2025, marking the first full refresh since 2019. This new dataset replaces the 2019 Index across England and is based on the revised 2021 Lower Layer Super Output Areas (LSOAs), which now total 33,755, up from 32,844 previously.

What’s New in the 2025 Update

The 2025 index, referred to as IoD25, continues to measure deprivation across the same seven core domains, but with updated data sources, revised geographies, and refreshed population estimates following the 2021 Census.

Each LSOA has been ranked from 1 (most deprived) to 33,755 (least deprived) and grouped into deciles for easier comparison.

The domains and their weightings remain consistent with previous versions:

Key Differences from the 2019 Index

1. New LSOA Boundaries
   The move to 2021 LSOA codes means that results aren’t directly comparable with 2019 unless you remap old to new codes. Several areas have merged, split, or been redrawn to reflect population change.  Developer Note - If you're using lsoa_2011 codes, you must update to lsoa_2021.
   
   
2. Population Base Updates
   IoD25 uses population data aligned with the 2021 Census, providing more accurate measures of deprivation at the local level.
   
   
3. Refreshed Data Sources
   Many indicators have been updated with newer datasets (e.g. 2022/2023 health, education, and employment data). This can shift an area’s ranking even if underlying conditions haven’t changed dramatically.
   
   
4. Policy Implications
   Because IoD25 reflects recent socioeconomic data, local authorities and policymakers will use it to guide funding, service provision, and area-based interventions for the next several years.

What This Means for PropertyResearch.uk Users

The deprivation data shown on this site has now been updated to the 2025 figures, replacing all 2019 data for England.

• When searching by postcode, results now reflect the new 2021-based LSOA boundaries.
• Deciles and ranks have been recalculated based on the new national totals (1–33,755).
• Maps and indicators now represent the most up-to-date view of local deprivation in England.

If you’re comparing a postcode’s deprivation score to historical values (2019 or earlier), be cautious, boundary changes mean it may not be a one-to-one comparison.

In Summary

This update ensures the deprivation index reflects modern realities. The headline weighting of domains remains the same, but with updated data, refined boundaries, and a new national baseline, 2025 provides the most accurate picture yet of how deprivation varies across England.