Hillingdon Hospital has failed a number of assessments which examine hospital cleanliness.
The ratings are based on surveys where teams of local staff and patients go into hospitals and look at things like cleanliness, privacy and food, before filling out a form to rate it.
The hospital, which provides care to around 64,000 patients annually, failed on the maintenance and safety of its grounds, according to a team of patient assessors.
The team also said the condition, appearance and maintenance of floors and internal fixtures and fittings were not up to scratch.
A spokesman for Hillingdon Hospital says they have strengthened their cleaning services since the 2014 assessment.
They said: “We have reviewed the resources we have for cleaning and now work to the National Specifications for Cleanliness in the NHS which sets out quality standards to be achieved and audit processes.”
The findings come from The Patient-Led Assessments of the Care Environment (PLACE) programme.
These self-assessments are undertaken by teams of NHS and private/independent health care providers, and, include at least 50% members of the public (known as patient assessors).
They focus on the environment in which care is provided, as well as supporting non-clinical services such as cleanliness, food, hydration, and the extent to which the provision of care with privacy and dignity is supported.