Dear Aspirant,
There are colleges who offer part time Diploma in Civil Engineering in Mumbai which is a 4 year course. Here's a list of a few of them:
I am providing you a link which contains all the information about M.H Saboo Siddik Polytechnic college
https://www.careers360.com/colleges/mh-saboo-siddik-polytechnic-mumbai/diploma-in-civil-engineering-part-time-course
Hope this Helps !
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