Between 2% and 6% of the UK population is estimated to live with hoarding disorder — meaning roughly 1.3 to 4 million people in the UK alone. Globally, similar prevalence rates suggest tens of millions of people worldwide have the condition. These figures make hoarding one of the more common mental health conditions, though it is dramatically under-recognised because most cases never come to clinical attention.

The current UK estimate

Well-conducted prevalence studies place the figure between 2% and 6%. The variation reflects different diagnostic thresholds and different methodologies rather than genuine population differences. The commonly cited midpoint is around 2.5-3% of adults, which for the UK translates to approximately 1.7-2 million people.

For comparison, this is roughly the same prevalence as generalised anxiety disorder and more than the prevalence of OCD or bipolar disorder. Hoarding is not a rare condition.

Age patterns

Hoarding prevalence rises sharply with age. Studies show:

18-30 years: around 1-2% meeting full diagnostic criteria, though early hoarding tendencies are more common.
30-50 years: rising to 2-3%.
50-70 years: 3-4%.
70+ years: 5-6% or higher.

The rise reflects both the cumulative effect of decades of behaviour and the specific triggers that appear in later life (bereavement, retirement, reduced mobility, cognitive changes).

Sex differences

Studies show broadly similar prevalence in men and women, though presentation patterns differ. Women are more likely to hoard clothing, sentimental items and household goods. Men are more likely to hoard tools, papers and electronics. Women are more likely to seek help; men are more likely to reach clinical attention through housing or safeguarding rather than self-referral.

Under-recognition

The formal diagnosis of hoarding disorder was only established in 2013. Before that, cases were classified under OCD, personality disorders, or not at all. This means that many older adults who meet current criteria were never formally diagnosed during earlier decades.

Under-recognition also happens because most hoarders never present to services. Shame keeps them hidden. Family members do not know where to turn. GPs may not screen for hoarding in routine appointments. The visible cases — those that reach environmental health, safeguarding or fire service attention — are the tip of a much larger iceberg.

Severity distribution

Not everyone with hoarding disorder has a severely hoarded home. The Clutter Image Rating scale gives a sense of the distribution:

CIR 4-5 (clinically significant hoarding, home still broadly usable): the majority of cases.
CIR 6-7 (rooms significantly impaired): substantial minority.
CIR 8-9 (severe hoarding, home barely usable): minority but still numbering tens of thousands nationally.

The visible severe cases attract media and public attention, but they are not representative of the whole spectrum.

Global figures

International studies produce similar prevalence figures. The US, Germany, Sweden, Australia and the UK all report rates in the 2-6% range. Cultural differences affect presentation — what gets kept, what triggers concern, when help is sought — but the underlying prevalence appears broadly stable across developed societies.

Emerging research from Asia and lower-income countries suggests similar prevalence with different presentation patterns. The condition appears to be universal, not culturally specific.

Trends over time

There is no clear evidence that hoarding has become more common than it was historically. However, several factors may be changing presentation:

Consumer culture and easy online purchasing may increase acquisition.
Longer lifespans mean more time for accumulation to develop.
Ageing populations increase the number of older adults at higher-prevalence life stages.
Better recognition since 2013 means more cases are identified.

The COVID pandemic and lockdowns almost certainly increased hoarding presentations by combining isolation, stress and increased online purchasing.

Numbers requiring intervention

Not every person with hoarding disorder requires professional intervention. Many manage the condition privately, with support from family, without safety being severely compromised.

Rough estimates suggest that of the 1.7-2 million UK adults meeting criteria, several hundred thousand have homes requiring some level of practical intervention, and tens of thousands have homes at severe safety risk.

Local authority hoarding panels report growing caseloads as the condition is better recognised and services become better organised to respond. Fire service data show that hoarding is a factor in a significant minority of fatal fires in domestic properties.

The economic scale

Hoarding disorder produces substantial economic costs. Estimated UK annual costs across healthcare, social care, housing, fire service response and specialist clearance run into hundreds of millions of pounds. Individual clearance costs, evictions, care placements and property damage add substantially to the total.

Investment in earlier intervention and better-coordinated support is consistently more cost-effective than crisis response, but funding models often do not reflect this.

The people behind the numbers

Statistics can obscure the reality. Behind every percentage point are individuals dealing with a genuinely difficult condition, families trying to help, and services trying to respond. The 1.7-2 million UK adults meeting criteria include your neighbours, your colleagues, your family members and — perhaps — you.

Understanding the scale helps normalise the condition. Hoarding is not a rare oddity affecting only a few television-worthy cases. It is a common, recognised, treatable mental health condition affecting millions of people at any given time.

Better recognition, better services and better public understanding all follow from taking the numbers seriously. The condition is common. The support should match.

How Many People Are Hoarders?