These days remortgage clauses are almost universal in IVAs for property owners so you should check that it isn't buried away somewhere either in the proposal or the creditors modifications at the meeting. If it really isn't anywhere, then you're in the clear.
Even so, if the remortgage clause is a standard one you will only be obliged to remortgage if during the 4th year of the IVA the existing mortgage is less than 85% of the value of the house, otherwise it will be deemed that you have insufficient equity in the property.
If you think your living allowance is insufficient, you should contact your Supervisor to explain why. If he agrees with you, he can convene a creditors' meeting to approve a reduction in payments, but they'll only accept this if they feel that your argument is convincing.
Philip Beck -
www.freeivaadvice.co.uk
Licensed Insolvency Practitioner and IVA specialist