Chances are that you will not be able to remortgage and, if you have sufficient equity, your IVA will continue for a further year.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
IP firms are usually paid 15% of realisations so if you do raise a lump sum your IP will be paid. However as Kallis says this is unlikely anyway as very few people get remortgages while in an IVA. This may change over the next few years depending on the mortgage market itself.
15% is the current usual fee agreed with the creditors -- indeed this figure has, over the years, been creditor led and it is they who have been amending proposals to this figure. I gather a few firms do charge more.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014