This is becoming more and more popular. You can fund up to
95% of the land value and then advance fund each stage of the
build with the borrowing based on the final, completed value and
helping cashflow significantly.
You can also self certify your income and defer mortgage
payments for up to 10 months during the build, therefore
allowing you to stay in your current property during this
time. There is also a choice of lenders and schemes.