Rehab outcomes
What the UK data actually says about rehab outcomes, where clinic claims of 70% to 80% success come from, and what actually moves the numbers.
Rehab success rate is a hard number to pin down in the UK and that is partly by design. Different parties measure different things across different windows and call all of it success. This page lays out what the published UK figures actually say, what the various headline numbers mean, and what does and does not move outcomes once a rehab stay is over.
12stepfinder has no stake. We list every UK recovery meeting in one search, take nothing from any clinic, and this page exists because it is the question that most honestly deserves a straight answer.
Last updated: 10 November 2026.
The most-cited UK figure comes from the Office for Health Improvement and Disparities (OHID) National Drug Treatment Monitoring System (NDTMS), which collects data on everyone in structured alcohol or drug treatment across England each year. For alcohol, around 59% of people who complete a course of structured alcohol treatment are recorded as having successfully completed it and not re-presented within six months. For opiates, the figure is lower, usually around 25% to 30%. For non-opiates (such as cocaine, cannabis or stimulant use), it sits around 36% to 44%. These numbers vary a few points year to year.
Scotland, Wales and Northern Ireland collect similar data through their own systems with similar ranges. The methodology is comparable: successful completion plus no re-presentation inside a six-month window.
Note what this measures and what it does not. It measures the structured treatment that NHS and NHS-contracted community services deliver, which is mostly outpatient and includes some residential. It does not measure what private rehabs claim. There is no equivalent published dataset for private residential rehab in the UK.
Headline claims from private clinics of 70%, 80% or occasionally 85% success are almost always measuring one of three narrower things: completion of the 28-day programme, abstinence at discharge, or self-reported abstinence at three months. Each of those is a real thing a clinic can measure. None of them is what most people mean when they ask what the success rate is.
The question most people are asking is: of a hundred people who walk into this rehab, how many are still off the thing a year later. That number, honestly measured, is usually much lower than the headline. Published US and UK studies on residential rehab consistently put 12-month continuous abstinence somewhere in the 20% to 40% range for alcohol, depending on severity and aftercare, with higher numbers for less severe cases and lower for more severe. This is not clinical failure; addiction recovery is nonlinear for most people. It is just not a 75% to 85% picture, and no credible UK research supports those headline figures.
If a clinic is making a success-rate claim, the fair questions are: what are you measuring, over what window, in what sample size, and how was the follow-up conducted. If they cannot define their number clearly, it is a marketing figure, not a clinical one.
There are several defensible definitions, and they give different numbers.
| Measure | What it captures | What it misses |
|---|---|---|
| Completed the programme | The person finished 28 days and did not leave early | What happened afterwards, including any relapse the next week |
| Abstinent at discharge | The person left sober or clean | The three days after discharge, which are the highest-risk window of the year |
| Abstinent at 3 months | Short-term outcome, often self-reported | Longer-term stability; self-report overstates by 10 to 20 percentage points |
| Abstinent at 12 months | Long-term outcome, the honest number most people want | That recovery is not always continuous; some people have a slip and come back, which this measure counts as failure |
| No successful completion followed by re-presentation (OHID) | The person completed structured treatment and did not need to return within six months | People who finish privately and would not re-present to NHS services even if they relapsed |
| Improved quality of life, functioning or harm reduction | Captures genuine recovery that does not fit a binary abstinent/not framing | Harder to measure consistently; easier to game |
The strongest finding across decades of UK and international research is also the least glamorous: aftercare engagement is the biggest single predictor of 12-month outcomes. People who stay engaged with structured support (peer meetings, continuing therapy, community service contact) for a year after their residential stay do markedly better than people who return to the same environment with no next appointment on the calendar. The effect size is larger than any difference between rehab modalities.
The second strongest predictor is housing stability. Someone leaving rehab into secure housing is in a different recovery environment to someone leaving into the same household where their use was embedded, or into temporary accommodation. UK outcomes data is unambiguous on this.
Third is medication adherence, where applicable. For alcohol, acamprosate, naltrexone and disulfiram all have good evidence when taken consistently alongside support. For opiates, methadone and buprenorphine substantially reduce overdose and continued use, and the public-health evidence base for them is one of the strongest in the field.
Fourth is therapeutic alliance, meaning whether the person trusts and feels understood by at least one specific clinician or peer. The approach matters less than this relationship.
What does not move outcomes very much, once you are controlling for the above: the length of the stay beyond around 90 days of combined inpatient-plus-outpatient care; the specific modality (twelve-step, CBT, combined, motivational); and the facility's property, grounds or price tier.
If you are choosing between rehabs, the single most useful question to ask is about aftercare, because that is where the research points. See how to choose a rehab for the full set of criteria.
If you are weighing rehab against the alternative, this means something specific: a cheaper or free route with strong structured aftercare often outperforms a premium residential stay with weak aftercare. Peer support, community services and therapy together are the backbone of UK recovery, not the residential month.
If you are supporting someone through this, the high-leverage support is for the year after, not just the month during. The residential stay is the start; the year that follows is where the outcome is made.
There is no single published figure for private residential rehab specifically. The closest honest estimates from UK and international research put 12-month continuous abstinence in the 20% to 40% range for alcohol, depending on severity, with higher numbers for mild-to-moderate cases supported by strong aftercare. Clinic headline claims of 70% to 85% are almost always measuring completion or short-term abstinence, not 12-month recovery.
Peer support is not usually measured as a separate treatment arm, because people attend alongside other things. UK and international research finds that attending peer support meetings three or more times a week in the year after any treatment is the single strongest predictor of sustained recovery. The effect holds across twelve-step and CBT-based fellowships. See [AA vs SMART Recovery](/aa-vs-smart-recovery) for the honest comparison.
The [NDTMS annual report](https://www.gov.uk/government/collections/alcohol-and-drug-misuse-and-treatment-statistics) measures the proportion of people who complete a structured course of NHS or NHS-contracted alcohol or drug treatment and do not re-present within six months. For alcohol in recent years this has sat around 59%. For opiates it is lower, around 25% to 30%. For non-opiates it sits around 36% to 44%.
Clinics have a commercial reason to present the most favourable defensible number, and completion of a 28-day programme is the easiest number to publish honestly. It is not a lie but it is a narrower measure than most people hear in it. Any clinic can tell you its 12-month outcome data if it has any; most do not collect it.
Clinically, no. Recovery is nonlinear for most people, and lapses are extremely common. UK clinicians treat a slip as a reason to re-engage with support fast, not as a reason to call treatment failed. See [I've relapsed](/ive-relapsed) for the practical next steps.