Best Private Mental Health Hospitals in the UK

A practical guide to choosing inpatient psychiatric care — written by a specialist clinic that isn't one.

PROMIS is a small residential clinic in London and Kent specialising in addiction, eating disorders, and dual diagnosis. We are not a psychiatric hospital. Most weeks, someone contacts us looking for inpatient psychiatric care we don't provide — and we point them elsewhere. This page is what we tell them.

Because we sit alongside the UK's private psychiatric hospitals rather than compete with them, we can write about them honestly. None of the hospitals named below paid to be on this page, and we've deliberately left ourselves off the list — we don't belong on it.

A note on Cardinal Clinic.

PROMIS has a clinical partnership with Cardinal Clinic. We've included Cardinal below because they are an established UK private psychiatric hospital, but you should know about the relationship before reading our entry on them.

If you or someone you love is in immediate danger, this page is not the right place to start.

Call 999, go to your nearest A&E, or call the Samaritans on 116 123. The hospitals listed below are for non-emergency, planned admissions.

How to choose a private mental health hospital

The right hospital depends on what kind of care you need, who will be treating you, and how the practical details fit your life. These are the questions we'd ask in your position.

CQC rating and inspection report: Every hospital in England is regulated by the Care Quality Commission. Look up the provider on cqc.org.uk and read the most recent inspection report, not just the headline rating. The report tells you what inspectors actually saw on the wards. Ratings change — check the date.
Consultant psychiatry: Find out which consultant psychiatrist you would be admitted under, what their clinical specialism is, and how often they see patients on the ward. The consultant matters more than the building.
Inpatient, day patient, or outpatient: Inpatient admission is for people who need 24-hour psychiatric care. Day patient programmes offer intensive treatment while you sleep at home. Outpatient care is appointment-based. Many people don't need a hospital bed — they need the right level of care.
24-hour care: If you're considering inpatient care, confirm there is a doctor on call overnight, what the nursing ratio is at night, and how psychiatric emergencies on the ward are handled.
Specialism: General psychiatric hospitals can treat most adult mental health conditions. For some needs — eating disorders, complex trauma, addiction with co-occurring illness, perinatal mental health, adolescent care — a hospital with a dedicated specialist programme makes a real difference.
Family involvement and aftercare: Ask how the hospital involves family, what discharge planning looks like, and what aftercare is offered. Recovery happens after discharge. A good admission ends with a clear plan, not a phone number.
Location: Distance matters more than people expect. Visiting, day-release, family therapy, and continuity with your existing therapist all become harder if the hospital is far from home.
Insurance and cost: If you're paying through insurance, confirm in writing that the hospital, the consultant, and the expected length of stay are all covered. If you're self-paying, ask for an all-in estimate including consultant fees, medication, therapy and any add-ons.

A note on the NHS and the Maudsley

The Maudsley Hospital in south London is part of South London and Maudsley NHS Foundation Trust, and one of the world's leading psychiatric research and teaching hospitals. Its work shapes standards across the whole of UK mental health care, public and private. The Maudsley is not a private hospital and does not generally take privately-funded inpatient admissions — we mention it because anyone researching mental health hospitals in the UK will encounter the name.

NHS care, including specialist tertiary services, is accessed through your GP or, in a crisis, A&E.

Private mental health hospitals in the UK

A short, alphabetical guide to established private providers of inpatient mental health care in the UK. This is not a ranking and it is not exhaustive.

Cardinal Clinic

Windsor, Berkshire

Cardinal Clinic is an independent psychiatric hospital in Windsor that has been treating private patients for several decades. It offers inpatient and day-patient care across mood disorders, anxiety, addiction, and stress-related conditions, with a consultant team that includes some of the most respected names in private psychiatry outside London.

PROMIS works in clinical partnership with Cardinal Clinic. We've included them here for the same reason as the others — they are an established, regulated UK private psychiatric hospital — and we want to be transparent about the relationship rather than hide it.

Known for: A calm, established setting and continuity of care between inpatient and day-patient programmes.

Disclosure: PROMIS has a clinical partnership with Cardinal Clinic.

Castle Craig Hospital

Peeblesshire, Scottish Borders

Castle Craig is one of the UK's longest-established residential addiction hospitals, set on a country estate in the Scottish Borders. It is a specialist addictions hospital — alcohol, drugs, and behavioural addictions — and treats co-occurring mental health conditions alongside the primary addiction.

The programme is residential and structured, with the kind of grounding in evidence-based addiction medicine that many UK clinicians regard as foundational to the field.

Known for: Depth of expertise in addiction, and a residential environment built specifically for recovery.

Cygnet Health Care

Sites across England and Wales

Cygnet operates one of the largest networks of mental health hospitals and specialist services in the UK, covering acute psychiatric admission, secure and rehabilitation services, eating disorders, learning disabilities and complex care.

Cygnet works with both private and NHS-funded patients, and for many parts of the country a Cygnet hospital will be the practical option for an acute admission close to home.

Known for: Geographical reach and a broad range of specialist services across one provider.

Nightingale Hospital

Marylebone, London

Nightingale Hospital is an independent psychiatric hospital in central London. It offers inpatient, day-patient and outpatient care across general adult psychiatry, addiction, eating disorders, and adolescent mental health, with consultants drawn from across London's private psychiatric community.

Its central London location matters for people who want to be close to home, family, or their existing therapist during admission.

Known for: London-based inpatient psychiatric care across the full range of common conditions.

The Priory Group

Sites across the UK

The Priory operates the largest network of independent mental health hospitals in the UK, with sites in most major regions. The scale matters: the group has invested in dedicated programmes — eating disorders, neurorehabilitation, addiction, child and adolescent care, complex acute psychiatry — at a depth smaller providers cannot replicate.

A Priory hospital is often the most accessible private psychiatric option simply because there is one within reach.

Known for: Nationwide coverage and dedicated specialist programmes within a single provider.

Where PROMIS fits — and where we don't

PROMIS is a small residential and day-patient clinic, not a hospital. Our two sites — Hay Farm in Kent and Kendrick Mews in London — provide care for addiction, eating disorders, and dual diagnosis. We don't offer secure psychiatric admission, child and adolescent care, or general acute psychiatric inpatient services. If your situation needs one of those, the hospitals above are who we'd point you toward.

People come to us when they want a small, family-led setting, when they're navigating addiction together with a mental health condition, and when they want continuity from residential care into outpatient and aftercare.

Mental health treatment at PROMIS Speak to our team

Practical next steps

1
Read the most recent CQC inspection report for any hospital you're considering. Search the provider name on cqc.org.uk.
2
Talk to your GP, or a private GP, about a referral and a consultant recommendation.
3
Ask the hospital directly which consultant you would be admitted under, and what their specialism is.
4
Confirm insurance coverage in writing — the hospital, the consultant, and the expected length of stay.
5
Ask about aftercare and discharge planning before admission, not at the end of it.

If you'd like to talk it through

Whether or not PROMIS is the right place for you, we're happy to help you think it through. Our team can tell you honestly whether our service fits your situation, and where to look if it doesn't.

London: 0207 581 8222 Kent: 01304 841 700 Contact us

Last reviewed: May 2026. Hospitals open, close, change ownership, and update their services. We refresh this page periodically. If something here is out of date, please let us know at enquiries@promisclinics.com.