In some cases, you may find it necessary to seek an extension of your existing visa/leave to ensure that you remain legal and compliant with the terms of your visa.
A valid visa is considered to be a valid period of leave. If you wish to extend your existing valid visa, you will require a further leave to remain.
This is a particularly complex area of law as the application process varies depending on your circumstances and the reason why you are requesting an extension.
Extension applications attract sizeable Home Office application processing fees and extensions over 6 months in duration are also subject to an Immigration Health Surcharge (IHS) fee.
Home Office application fees are non refundable so it is important that the applications are done correctly first time around to avoid costly mistakes.