You're welcome.
When you are switching, the lender will require an independent valuation to be carried out to verify what the house is worth - whether it is self built or not. On this valuation will be the rebuild cost - this is what the house needs to be insured for to keep the bank happy.
Mortgage protection is a type of life insurance - it can be confusing so bear with me. Mortgage protection will clear the outstanding mortgage amount on death, the amount insured will reduce as you pay off your mortgage. This will be assigned to the bank meaning they will get the proceeds of it in the event of your death.
Life insurance on the other hand will have a level or constant sum assured, it will always be €x no matter what.
All you need to satisfy the lender is the basic mortgage protection policy but if you have dependents you should look into putting in place a separate personal life insurance policy.
Hope this makes sense.