There are many pitfalls to buying “off the plan” including settlement value, actual room sizes and timing.
As far as settlement value is concerned expect any lender to value the finished or near finished property.
It is not uncommon for valuations to be lower than a purchase price which can require more equity from the purchaser.
Not good news at settlement and can cause much heartache for unsuspecting buyers. More on completion date, particularly for the owner/occupier, next time.