Hi ali and welcome to the forum
Was tbe property originally included in the IVA - ie have you agreed to an equity release during the final year, or additional contributions to address the equity? We cannot advise you properly without this information - and can you also confirm the current value of your property and amount owed to the mortgage company.
My gut feeling is that an offer of £20,000 will be too low, as you will probably have some disposable income left to still maintain IVA contributions until the end of the 5 year term.
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