Let's say you have an ordinary variable rate interest-only mortgage on a flat which is your main residence. You want to rent it out for what would be several years but don't wish to remortgage to buy-to-let to do this. Your mortgage company will permit an assured shorthold tenancy on the existing mortgage but only if (a) the period of the rental is no longer than 2 years and (b) your declared intention is to move back in at the end of the rental period. You do want to move back in eventually but not for about 10 years.
Firstly, on the permission to let application the mortgage company asks why you want to let the property. What sorts of reasons are they likely to accept, especially if they want you to move back in after a couple of years? (or if its easier what reasons WON'T they accept)
Secondly. which scenario would be "least risky":
1) you apply for permission to let with the stated reason and then at the end of the 2 year tenancy instead of moving back in you just renew the tenancy without telling the mortgage firm or remortgaging, and you do this every few years, hoping they don't find out. 2) you apply, are refused permission but rent it out anyway, hoping they never find out. 3) you don't apply for permission to rent in the first place, thus avoiding being turned down or the mortgage firm even having a suspicion that the flat is rented.Your biggest worry is what the mortgage firm could do to you, your mortgage or the property if they found out you had rented without their permission. This is presuming the flat had been kept in good order the whole time and your mortgage had always been paid on time.
I've heard one of the reasons for getting permission is that it affects insurance but I don't know if this is home contents insurance or buildings insurance. If the latter does it make any difference that the flat is in a block which are all rented privately as well.
Thanks