One possible Solution:
Instead of applying for an construction loan, just apply as an improvement/renovations refinance ...now not a lot of banks will allow the valuer to bring the value up based on "future improvement" however i done this a few times in the past and i know this feature is offered by ABL ( Adelaide bank) and ING ( tend to be more strict) just to name the top 2.
In this case both lenders, lend up to 90% of the total value of the subject property taking into account all improvements.
The bank will get the valuer to value the proposed improvements ( simliar to a construction loan) and that will provide a total valuation amount.
really, pls explain how you can take end value / as complete val without a construction loan process....I don't think it's possible.