Anti-ligature design is one of the most important ways to keep people safe in mental health wards, prisons, police custody and specialist schools. It is also one of the most misunderstood. There is no British Standard that defines it, guidance is spread across several bodies, and product claims vary widely.
This guide brings it together: what anti-ligature means, where ligature risk is found, the guidance that applies, how to manage the risk, and what to look for when you specify products. Each section links to a more detailed guide.
A ligature is anything that could be used to bind or tie, such as a cord, belt, sheet or item of clothing. A ligature point is a fixed feature that a ligature could be attached to and that could bear weight, wholly or partly. Door handles, hinges, window frames, curtain rails, exposed pipework, radiators and ventilation grilles can all be ligature points.
An anti-ligature product is designed to reduce the opportunities to attach a ligature. It does this through its shape, how it is fixed and the materials it is made from. No product can remove risk entirely, which is why you will see responsible suppliers describe their products as anti-ligature or ligature-resistant, never ligature-proof.
Anti-ligature is also different from low surface temperature (LST). LST products keep touchable surfaces cool enough to prevent burns. Many settings need both, so check each separately. Our guide to anti-ligature vs LST radiators explains the difference.
The built environment is one of the few parts of suicide prevention that designers, estates teams and specifiers directly control. The figures show why it matters.
Every one of these figures represents a person, a family and the staff who cared for them. Good design can't prevent every death, but it can remove opportunities and buy staff time to intervene.
Ligature risk looks different in each setting. These guides cover the detail.
| Setting | What matters most | Read more |
|---|---|---|
| Acute mental health wards | Bedrooms and en-suites without constant observation; heating, ventilation and windows | Radiator covers: a specification guide, Ventilation grilles, Ventilation and noise |
| Psychiatric intensive care units (PICUs) | Higher risk, damage resistance, stronger materials | Anti-ligature radiators for PICUs |
| Section 136 suites | Unpredictable short stays; no ligature points at all | Section 136 suites |
| Prisons and young offender institutions | Ligature risk plus stash points, weapons and searchability | Radiators for prisons and YOIs, Ventilation grilles for prisons and YOIs |
| Special educational needs schools | Durability, hygiene, rounded edges, safe surface temperatures | Anti-ligature radiators for SEN schools, Autism education |
| Mainstream schools and nurseries | Usually LST rather than anti-ligature, with exceptions | Anti-ligature vs LST in education |
| Windows in any setting | Ligature points, broken glass, escape | Window protection, Installing window protectors, Why curtains aren't always enough |
There is no single anti-ligature standard. Instead, a mix of law, guidance and test methods applies. The CQC itself notes there is no standardised approach to assessing ligature risk, so organisations set their own policies within this framework.
| Document | What it covers |
|---|---|
| Health and Safety at Work etc. Act 1974, Management of Health and Safety at Work Regulations 1999 | The legal duty to assess risk and reduce it so far as is reasonably practicable |
| Mental Health Act 1983 Code of Practice | Safe, therapeutic environments for people detained under the Act |
| NICE NG225 | Self-harm assessment, management and prevention |
| HBN 03-01 | Design of adult acute mental health units, including fixtures and fittings |
| HTM 03-01 | Specialised ventilation for healthcare buildings |
| HBN 00-10 Part D | Windows, including restrictors limiting openings to 100mm |
| Informed Choices (DiMHN and BRE) | Independent evidence and grading for anti-ligature products |
| Home Office Police Buildings Design Guide: Custody | The source of the 2mm holes at 4mm centres grille pattern (why it matters) |
| HMPPS specifications | Requirements for products in prisons, tested by UKAS-accredited labs |
| BS EN 60529 (IP code) | Ingress protection testing. IP3X shows a grille resists objects over 2.5mm; it is not an anti-ligature test on its own |
Because no standard defines anti-ligature, always ask suppliers what they tested, how, and what the results were.
A widely used approach sets a simple order of priority:
This sits within a wider process. Keep a ligature risk register, reviewed at least annually and after any incident or change to the building. Audit installed products to check fixings and clearances are still as specified; even a small gap between a radiator guard and the wall can create a new risk, as our guide to open-ended shoulders explains. Involve clinical staff, estates and patients' representatives in decisions.
Not every ligature point should go. A grab rail can be a ligature point, but removing it may cause falls. The aim is the right balance of risks for the people using each space.
Whatever the product, the same principles apply.
An environment that feels like a cell can make people feel distrusted and distressed, which works against recovery. The best anti-ligature design is barely noticeable. Products should come in calm colours, fit the room properly and let people keep some control, such as adjusting their own room temperature through an anti-ligature valve. Architects and specifiers have a big part to play here: the aim is a space that is both safe and therapeutic.
Contour designs and manufactures anti-ligature products in the UK, made to measure for each site.
| Product | What it does | Find out more | |
|---|---|---|---|
| DeepClean Extra radiator guards | Anti-ligature, low surface temperature radiator guards with single-person cleaning access | Product page, What happens when you specify one | |
| Vertical DeepClean Extra | Floor-to-ceiling anti-ligature radiator for rooms with little wall space | Vertical anti-ligature radiator | |
| Window protectors | Steel-framed polycarbonate protection fitted over existing windows: surface-mounted, inset or external, with an optional integrated blind | Window protectors | |
| Anti-ligature ventilation grille | Small-hole grille that fits existing ventilation openings | Ventilation grille | |
| Anti-Ligature Ventilation System (ALVS) | Plenum and flush grille with tested airflow and noise data | ALVS | |
| Light switch cover | Lockable cover that stops switches being tampered with | Light switch cover | |
| Thermostat cover | Perforated, chamfered cover for wall thermostats | Thermostat cover | |
| Contour Secure cam locks | Flush security locks with a restricted key profile, keyed alike for ease of maintenance | Cam locks |
Every product is made to order after a site survey. Anti-ligature radiators and guards are typically made in 15 working days from drawing approval and come with a two-year warranty. Contour is also BioCote's exclusive partner for anti-ligature and LST radiators and guards, with antimicrobial protection built into the powder coating.
No. Suppliers should state what they tested, the method and the results. Informed Choices grading and UKAS-accredited lab reports are good evidence to ask for.
No. IP3X (BS EN 60529) is an ingress test showing that objects wider than 2.5mm can't get through an opening. It's useful evidence for a grille, but anti-ligature performance also depends on shape, fixings, gaps and installation. More on grille guidance.
Anti-ligature design reduces the chance of attaching a ligature. Low surface temperature (LST) design keeps touchable surfaces cool enough to prevent burns. Many settings need both.
Yes. Enclosing a radiator behind a small-hole grille reduces its output, so heating should be sized with the guard in mind. Contour's DeepClean Extra output tables already allow for this. Our specification guide covers it in more detail.
At least once a year, and after any incident or change to the building or how a space is used.
Yes. Radiator guards, window protectors and ventilation grilles are all designed to be fitted during refurbishments, often without major building work.
Whether you're planning a new unit or upgrading a single ward, Contour can survey your site and recommend the right products. See what happens when you specify with us, arrange a free site survey or download the Anti-Ligature Design & Specification Guide.
If you've been affected by any of the issues in this guide, Samaritans are available day or night on 116 123.