# Cassiobury South west Watford. 8,392 people (mid-2024 estimate) in 4.3 square kilometres. Cassiobury had 8,228 usual residents at the census (ONS Census 2021). Middle area. Code E02004975. In: [East of England](https://openindex.co.uk/east-of-england) › [Watford](https://openindex.co.uk/watford) ## Key figures - **Median sale price: £777,500** (2025). The median price paid for a home in Cassiobury was £777,500 in 2025. Joint 161st most expensive of 7,259. Source: Worked out by Open Index from HM Land Registry Price Paid Data. Published 28 September 2026. https://openindex.co.uk/watford/cassiobury#f-house-sales-median-price - **Population: 8,228** (2021). Cassiobury had 8,228 usual residents at the census (ONS Census 2021). Joint 3,164th most populated of 9,448. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/watford/cassiobury#f-population - **People in radon Affected Area squares: 89%** (2022). About 89% of people in Cassiobury live in a 1 km square that the radon atlas marks as a radon Affected Area. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/watford/cassiobury#f-radon-affected-share - **Gigabit broadband coverage: 97.7%** (January 2026). In Cassiobury, 97.7% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026. https://openindex.co.uk/watford/cassiobury#f-gigabit-coverage ## On the map - [Radon Affected Area by middle area](https://openindex.co.uk/map/radon-affected-areas?place=E02004975) (Worked out by Open Index · 2022): About 89% of people in Cassiobury live in a 1 km square that the radon atlas marks as a radon Affected Area. - [Sales per year by middle area](https://openindex.co.uk/map/house-sales-per-year?place=E02004975) (Worked out by Open Index · 2025): 76 homes were sold in Cassiobury in 2025. - [Crime and ASB by middle area](https://openindex.co.uk/map/recorded-crime?place=E02004975) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for Cassiobury. - [Population by middle area](https://openindex.co.uk/map/population?place=E02004975) (Census 2021, England and Wales): Cassiobury had 8,228 usual residents at the census. ## Recorded crime in Cassiobury In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Cassiobury at a rate of 72.8 per 1,000 people. That compares with 110.3 per 1,000 people across Watford. Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates. | Kind of crime, 12 months to August 2026 | Count | | --- | --- | | Violence and sexual offences | 185 | | Other crime | 149 | | Anti-social behaviour | 112 | | Vehicle crime | 45 | | Drug offences | 39 | | Criminal damage and arson | 36 | | Burglary | 24 | | Robbery | 11 | | Theft from the person | 8 | | Shoplifting | 2 | Source: police.uk, 12 months to August 2026. ## How Cassiobury compares Each middle area against every other middle area the measure covers. | Measure | Cassiobury | Rank | Compared with | | --- | --- | --- | --- | | Median sale price | £777,500 | most expensive | 12 middle areas, Watford · 2025 | | Population | 8,228 | 5th least populated | 12 middle areas, Watford · 2021 | | People in radon Affected Area squares | 89% | 4th fewest people in radon Affected Areas | 12 middle areas, Watford · 2022 | | Gigabit broadband coverage | 97.7% | 3rd highest | 12 middle areas, Watford · Jan 2026 | ## Is Cassiobury safe? What police records show In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Cassiobury at a rate of 72.8 per 1,000 people. That compares with 110.3 per 1,000 people across Watford. Across England as a whole, the recorded crime rate was 96.3 per 1,000 people. In August 2026 alone, 62 cases of crime and anti-social behaviour were recorded in Cassiobury. In the 12 months to August 2026, the most common types were violence and sexual offences (185), other crime (149) and anti-social behaviour (112). Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates. Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest. ## Figures for the whole of Watford These figures are published for the whole of Watford, not for each middle area, so they describe all of Watford and not Cassiobury alone. [See Watford](https://openindex.co.uk/watford) - **Average house price: £404,299** (July 2026). Watford’s average house price was £404,299 in July 2026 (HM Land Registry). Down 0.7% in a year. Source: UK House Price Index, July 2026. Published 16 September 2026. - **Median full-time pay: £43,219** (2025). Full-time workers living in Watford earned a median of £43,219 in 2025 (ONS earnings survey). 83rd highest paid of 348. Source: Annual Survey of Hours and Earnings, 2025. Published 23 October 2025. - **House price to pay: 9.4×** (2025). A home in Watford costs 9.4 times local full-time pay. Joint 71st least affordable of 348. Source: Worked out by Open Index from the UK House Price Index and the ONS earnings survey. Published 16 September 2026. - **Deprivation score: 16.3** (2025). Watford has a deprivation score of 16.3 in the English Indices of Deprivation 2025 (MHCLG). Joint 116th least deprived of 296. Source: English Indices of Deprivation 2025, 2025. Published 30 October 2025. ## Cassiobury in brief The median price paid for a home in Cassiobury was £777,500 in 2025. Cassiobury had 8,228 usual residents at the census. About 89% of people in Cassiobury live in a 1 km square that the radon atlas marks as a radon Affected Area. In Cassiobury, 97.7% of homes and businesses could get gigabit-capable broadband in January 2026. ## About - Type: Middle area - Code: E02004975 - Ward: [Park †](https://openindex.co.uk/watford/ward/park) - Constituency: [Watford †](https://openindex.co.uk/constituency/watford) - Council: [Watford](https://openindex.co.uk/watford) - Region: [East of England](https://openindex.co.uk/east-of-england) - Nation: [England](https://openindex.co.uk/england) - Area: 4.31 km² - People, mid-2024: 8,392* - Neighbourhoods: 4 - Output areas: 23 * People: worked out by Open Index by adding up the neighbourhood estimates inside this area. † Best fit: the ward and constituency this middle area mostly lies in. Its edges do not follow theirs. ## Next door [Croxley North & Sarratt](https://openindex.co.uk/three-rivers/croxley-north-and-sarratt), [Nascot Wood](https://openindex.co.uk/watford/nascot-wood), [Holywell](https://openindex.co.uk/watford/holywell), [West Watford](https://openindex.co.uk/watford/west-watford), [Central Watford](https://openindex.co.uk/watford/central-watford), [Croxley Green](https://openindex.co.uk/three-rivers/croxley-green) ## Latest updates for Cassiobury - Dental practices updated: NHS England · Oct 2026. - Schools updated: Ofsted · Oct 2026. - GP practices updated: NHS England · Oct 2026. - Schools updated: Department for Education · Oct 2026. The same figures as JSON: https://openindex.co.uk/v1/places/E02004975 ## How to cite Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/watford/cassiobury, or to one figure with its anchor, https://openindex.co.uk/watford/cassiobury#f-house-sales-median-price. Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it. Snapshot 2026.10.8, https://doi.org/10.5281/zenodo.23508850. The HTML page: https://openindex.co.uk/watford/cassiobury