You haven't mentioned whether you have taken a land loan or a land loan + construction loan. From the points you have mentioned, I guess that you have applied for a land loan + construction loan. If so, you might be paying Pre-EMI all these days.
There are provisions to extend the timeline for another 6 months. For the same you have to visit the branch and give a written request. You can also consult the operations in charge on how to proceed. But if you are paying pre-EMI we are not recommending this move. THis is because, you are paying just interest alone and it is not reducing your principal outstanding.
If you have money in hand now and is in a position to foreclose the loan, you can do it. But better not to break your savings for foreclosure, as you have other options as well.
Another option, which is the best recommended is to give a request to downsize the loan amount with the disbursed amount and start the EMI asap. But for doing it, you should check with the bank, if they are providing land loan alone and if your property matches to their criteria.
So check with your bank how they can help you out