Smaller lenders, such as Newcastle, Manchester and Saffron building societies, have mortgage offers valid for three months.
The ombudsman service also noted that this year it had seen a small number of people claiming that a "legal loophole" – which they had usually read about online – meant their mortgage was not valid.
A mortgage offer is typically only valid for six months and the timetable to complete can drift, so you could lose your offer if the build drags on.
It will be valid for up to seven years after the mortgage is taken out.
Treasury officials said they understood that banks had valid reasons for placing higher values on their mortgages than investors, and said they were hoping to avoid major conflicts.
Forgiving debt owed pursuant to a lawful, valid contract risks creating a longer-term view by investors that the mortgage contract is less secure than ever before.
However, every mortgage valuation carried out had to be supported by three valid sales comparables – all within the previous six months – and, for buy-to-let, three rental comparables, too.
The Court will not address that issue in this Decision, but leaves open the issue as to whether mortgages processed through the MERS system are properly perfected and valid liens.
I need that money just as much as he does -- I have a mortgage, a husband, and a business to run, my needs are just as valid as his".
As for the complexity of the assets -- some of which range in the thousands of pages with complex mortgages packaged together in trusts - causing confusion among the masses, Richardson makes a valid point.
