I assume that you have retained an interest in this property, and if the mortgage will have been redeemed in full in five years time, that half of the value of the property would be yours? How much is the property currently worth, and how much do you owe in total to your creditors?
There will usually be an expectation that you release your share of the equity in the final year of the IVA to pay your creditors via the IVA.
If your share of the equity is equal to or more than your total unsecured debts, then the IVA may not be acceptable to your creditors unless you offer them 100p in the £.