If your house is repossessed while you are in an IVA, then any shortfall from the sale would be included as a debt in the IVA. If this is not possible due to the level of additional debt then your Supervisor would consider terminating your IVA or petitioning for your bankruptcy. If the sale results in a surplus of funds, then it is likely your share of the sale proceeds would be paid to your Supervisor and held for the benefit of creditors.