Gillick Competency Explained: What Consent, Confidentiality, and Choice Mean in Teen Therapy

When teenagers start therapy, one of the first questions that often comes up, sometimes quietly, sometimes very directly, is: Who gets to decide? Parents may wonder about consent and involvement, while teens may worry about privacy and being taken seriously. This is where Gillick competency becomes especially important. Understanding it can help both parents and teens feel more confident, informed, and reassured about how therapy works and why certain decisions are made.

Gillick competency is not about pushing parents out or giving teenagers unlimited freedom. Instead, it is about recognising when a young person has enough understanding and maturity to be involved in decisions about their own care. In therapy, where trust and honesty are central, this idea plays a meaningful role in creating a safe and respectful space for everyone involved.

What is Gillick competency?

Gillick competency is a legal and ethical principle used mainly in the UK. It helps professionals decide whether a person under the age of 16 can consent to their own medical or therapeutic treatment without a parent’s permission. Rather than focusing strictly on age, it looks at understanding.

A teenager may be considered Gillick competent if they can understand what therapy is, why it has been suggested, what might happen in sessions, and what the possible benefits and limitations are. They also need to be able to think through that information and make a voluntary decision. This approach reflects the reality that maturity develops at different rates for different people.

The concept comes from a legal case involving Victoria Gillick, whose challenge in the 1980s led to a ruling that changed how consent for young people is understood. Although the original case was not about therapy, its principles now apply widely across healthcare, including mental health support.

Why this matters in therapy with teenagers

Therapy works best when the person attending feels safe, respected, and genuinely involved. For teenagers, being told they must attend therapy or that everything they say will automatically be shared with parents can make it very hard to open up.

Gillick competency helps address this by recognising that some teenagers are capable of choosing therapy for themselves and understanding what that choice involves. When teens feel their voice matters, they are often more engaged, more honest, and more motivated to work through difficulties such as anxiety, low mood, stress, identity questions, or relationship challenges.

For parents, this approach can feel unfamiliar or even uncomfortable at first. However, it is often helpful to remember that therapy is not about secrecy for its own sake—it is about creating the conditions where real progress can happen.

How therapists assess Gillick competency

Gillick competency is not a test and not a label that lasts forever. It is a professional judgment made by the therapist and revisited over time. Therapists usually assess competency through conversation rather than formal assessment tools.

They may ask a teenager to explain, in their own words, what therapy is and why they are attending. They might explore what the teen understands about confidentiality, how therapy could affect daily life, or what they would do if therapy felt uncomfortable or unhelpful. These conversations often happen naturally in early sessions.

It is also important to know that competency is decision-specific. A teenager might be able to consent to talking therapy but not to more complex treatments. This flexibility allows care to be tailored to the individual rather than applying a one-size-fits-all rule.

Confidentiality: what teens and parents should know

Confidentiality is often the most sensitive topic for both teens and parents. Gillick competency supports the idea that a competent young person has a right to privacy in therapy, similar to an adult client. This privacy is often essential for teenagers to talk openly about their feelings and experiences.

That said, confidentiality does have clear limits. Therapists are always required to act if there is a serious risk of harm to the teenager or to someone else. Teens should be told about these limits in plain, honest language from the start, so there are no surprises later.

Many therapists also encourage shared conversations with parents when it feels helpful and safe, and when the teenager agrees. Gillick competency does not mean parents are shut out, it means information is shared thoughtfully and with respect for the young person’s autonomy.

The parent’s role in a Gillick-competent framework

Parents often worry that Gillick competency reduces their role or leaves them in the dark. In practice, supportive parents remain incredibly important. Emotional support, practical help, and encouragement from home can make a huge difference to how effective therapy is.

Therapists aim to balance respecting a teenager’s privacy with acknowledging parental care and concern. This can involve general updates about themes being worked on, guidance on how parents can support their teen, or joint sessions if everyone agrees they would be useful.

When parents understand that autonomy and confidentiality are tools to support their child’s wellbeing, not barriers, they often feel more at ease with the process.

Why this approach supports healthy development

Adolescence is a time of growing independence, identity formation, and learning how to make decisions. Involving teenagers in choices about their mental health supports these developmental tasks. It helps build confidence, self-awareness, and a sense of responsibility.

From a therapeutic perspective, Gillick competency aligns closely with core values such as respect, collaboration, and empowerment. It treats teenagers as individuals with their own thoughts and feelings, rather than as passive recipients of care.

Common challenges and misunderstandings

Gillick competency is not always straightforward. A teenager’s capacity can change depending on stress, mental health symptoms, or life circumstances. A young person may understand therapy well one week and feel overwhelmed the next. This is why therapists continually reflect and adjust their approach.

Cultural expectations can also influence how autonomy and family roles are understood. Therapists aim to be sensitive to these differences while still working within legal and ethical guidelines.

Another common misunderstanding is that Gillick competency gives teenagers full control over everything. In reality, it is a shared, carefully balanced approach that always keeps safety and wellbeing at the centre.

A shared understanding 

For both parents and teens, Gillick competency can feel complex at first. At its heart, though, it is about respect, communication, and trust. It recognises that many teenagers are capable of meaningful involvement in their own care, while still valuing the role of parents and professionals.

When everyone understands why this framework exists, therapy becomes less about control and more about collaboration. The goal is the same for all involved: to support teenagers in feeling heard, safe, and better equipped to navigate the challenges they are facing.