More than 180,000 dementia sufferers feel "trapped in their own homes", a charity has warned.
The Alzheimer's Society said that more than a third (35%) of people with dementia only leave their homes once a week.
And one in 10 get out just once a month, according to a poll of 510 people with dementia and carers.
A new report by the organisation states that many people with dementia are not able to take part in activities that they enjoyed before they developed the condition.
In fact, almost one in 10 (9%) of respondents said they had had to stop doing all of the things they used to do, and 28% of sufferers said they had to give up leaving their homes altogether.
The charity, which extrapolated figures obtained by the survey to estimate that as many as 184,800 UK sufferers feel "trapped" in their own homes, said that dementia sufferers are being "let down" by their communities.
The poll found that 44% of sufferers feel like a burden and so avoid getting involved with local life.
And just two in five think their local area is geared up to help them live well with their decline in brain function.
The Alzheimer's Society called on communities across the country to be more "dementia friendly" to help patients to remain independent and stay out of care for longer.
Improving stigma around the condition, having accessible transport and businesses that are "respectful and responsive", are all factors which could improve quality of life for sufferers, a charity spokeswoman said.