You can apply for different courses at the same university through UCAS. Each course counts as a separate UCAS choice, so applying to three courses at one university uses three of your available choices. The main limitation is not whether UCAS allows it, but whether your application makes sense across all the courses you choose.
How applying to the same university more than once works
UCAS does not stop you from choosing the same university more than once. You might apply for English Literature, English with Creative Writing, and English and History at the same institution. Each course appears as a separate choice on your UCAS application, with its own course code and its own admissions decision.
Your application is still the same application. The university receives the same qualifications, predicted grades, reference and personal statement answers for each choice. You do not write a separate personal statement for each course, even when the course titles are different.
This is where students need to be careful. Applying to different courses is allowed, but your single UCAS application has to support all of them. A personal statement built entirely around one subject will be weaker when read for another subject, especially if the link between the courses is thin.
If the courses are closely related, this can work well. If they are unrelated, it becomes much harder to show convincing academic interest in each course.
Choose courses that fit the same application
Applying to similar courses at the same university can be a sensible use of UCAS choices. For example, a student interested in international politics might apply for Politics and International Relations, Politics or International Relations at the same university. A personal statement discussing political systems, global affairs, current events and relevant reading would fit all three.
Joint honours courses can also work well. If your application discusses both History and Politics, applying for History and Politics alongside straight History or straight Politics can make sense, provided the statement gives enough attention to the subject being assessed.
The same applies to closely connected course variants. A university might offer Psychology, Psychology with Criminology, and Psychology with a Foundation Year. If your application is clearly built around psychology, those choices form a coherent set.
A much weaker approach would be applying to Computer Science, Law and Fashion Marketing at the same university with one application. Even if you have genuine interest in all three, each admissions tutor is looking for evidence that you understand and want their course. Briefly mentioning several unrelated subjects does not create a strong case for any of them.
More choices at one university do not guarantee an offer
Using several choices at one university does not automatically improve your chances. Each course still assesses whether you meet the entry requirements and whether your application fits that course. A university can reject you from one course and offer you another, or reject you from all of them.
Applying for related courses can improve your options when the university has several routes into an area you genuinely want to study. For example, if your first choice is Economics but your grades are closer to the requirement for Business Economics, applying to both gives the university two course choices to consider. Your application should still show clear interest in economics, quantitative study and the topics shared by both courses.
Where the subjects are very different, the extra choice is much riskier. A university is not more likely to admit you because you used several choices there. Admissions decisions are based on your suitability for the course, not on loyalty to the institution.
Be careful with your five UCAS choices
Every course at the same university uses one of your UCAS choices. If you use four choices at one institution, you leave yourself only one choice elsewhere. It is strongly recommended never to apply for more than two courses at the same university.
A balanced application might include two related courses at a favourite university, then similar courses at other universities with different entry requirements. This gives you more flexibility if one university is especially competitive or if your predicted grades sit close to the entry requirement.
Before adding multiple courses from the same university, check three things: the course content fits your academic interests, your application supports each course, and you would genuinely accept a place on each one. If a course is only there because it is at a university you like, it is not a strong UCAS choice.