Hi Elzo and welcome to the forum
Your house can only be repossessed if you either do not keep up the payments to the secured lender(s) or you enter into bankruptcy proceedings and there is equity for which you cannot identify anyone to purchase your interest.
But your property will need to be included into the IVA, and the usual provision is to offer a remortgage during the final year of the arrangement based upon 85% loan to value, with the resultant proceeds being used to pay creditors.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk