There is a limit on how much equity you can release and it's normally up to 80% of the value of the property.
Over 80%, you start to go into lender's mortgage insurance territory again. This is where you're paying a fee for the bank to take out insurance against you.
So I would say up to 80% would be the limit that you would wanna go to. The bank will do a valuation on your property.
They can do a valuation as is. So that's the current valuation for renovations. If it's gonna be substantial renovations, then the bank will do a valuation as on the completion of the value of the property.