Expats can switch visas while already living in the United Kingdom, but only if they meet specific eligibility rules set by the Home Office. In general, expats in the UK must apply to switch visas before their current visa expires and must still be in the country when submitting the application. Not all visa types can be switched from, so expats should carefully check whether their current status allows a change, as visitor visas usually cannot be converted into work or family visas. To switch, expats in the UK must submit a new online application, provide updated documents, pay the visa fee and Immigration Health Surcharge, and attend a biometric appointment or complete digital verification. While the application is under review, expats are usually allowed to remain in the UK under their existing conditions. Because switching visas can affect work rights and long-term settlement plans, expats are strongly advised to plan ahead and seek professional advice if their situation is complex.