According to the new law by Home Office, international students can apply for the new course, study and stay in the UK without going back to their home country. There could be many reasons due to which you need to extend your Tier 4 visa. For example, if you want to study further in the UK or want to change the track of your existing course, it would require you to stay in the UK more than the time period you already applied for. As mentioned above, the UK government allows international students to apply for a visa extension in different circumstances. Apply for 2nd Masters with Work Placement : You need to apply for a Tier 4 visa extension or renew before your current visa expires. Otherwise, you will lose the chance to stay in the UK and study further. This visa extension does not apply to international students who entered the UK for a short-term student visa. Who are eligible for visa extension from inside UK: If you want to apply for a Tier 4 visa extension from inside UK, you must have to complete your previous course successfully and have to provide official evidence of your course completion. If you are Tier 2 work permit holder and willing to switch on Tier 4 student visa you can apply from tier 4 visa extension from inside the UK. Tier 4 visa extension rule 2021-2022: Please visit the Home Office Website for more updated details. The new rule means that the students will now be able to apply for an extension in the UK as normal. This extension rule is also applied for the Tier 4 Part-time students but there are some restrictions for them.