Contact ur architect to do as built plan submission. Mpsj fees  as built plan submission $1,200. Not including ur architect charge.

Guys, here's my situation.

Draftsman has already sent me the drawings, signed and got the commissioner to chop and all.

Recently got a call from an engineer who says that needs his approval as well. I find that strange cos we didn't do anything for 1st floor. All works was for G floor only (extend front and back by 5ft each)

Is the engineer approval legit?

No, it is possible to do so.
Sometimes client-consultant relationship turns sour, sometimes the architect might be incapacitated to perform his duty, lots of possibilities. As long as the client has fully settled the account with (paid) architect 'A', and architect 'A' has subsequently issued a release letter to the client and also informed the local authority.
The client may then engage another architect 'B' to carry on with the project, with prior approval from the local authority.

For small projects like small home renovation, in my personal opinion, is simply not worth to do this. You could be penny wise pound foolish. It will most likely consume your time and energy and probably more money to do so, and in the process drag the project completion time late.

OK this one was cos of a mis-communication between me and the draftsman. All good now