Hi flamingohills and welcome to the forum
This is exactly what creditors will require you to do - but they will not insist on a sale. The usual provision is for you to have your property valued and then raise a mortgage based upon 85% of that value. Your existing mortgage is then paid off and the balance paid into the IVA. Creditors do not normally wish to see your increased mortgage payments at higher than 60% of the amount you are paying into the IVA.
There are no limits on income, but most practitioners will want to see a minimum contribution of at least £250 per month.
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