It is very unlikely that you will be able to join in a mortgage with your partner for another few years. If you could, your IVA would then impact on his credit rating and the interest rate would be very high. Added to this, you are not allowed to take on any more credit while in the IVA.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk
As Foggy says you can't take further credit so you would have to settle your IVA. If you were to do so and have access to a large deposit (possibly 25% +) there may be Specialist Lenders that would consider lending to you.
IVA Mortgage Expert
Zebra Money Centre