Is there any bank that considers a rented room in an apartment to be a source of income? I'm looking into buying a three bedroom place and intended to rent out one of the rooms, AIB however told me they wouldn't take it into consideration in my application.
Some lenders (e.g. Ulster Bank, First Active, IIB Homeloans and others) do take account of potential room rental income where a single person is obtaining a mortgage to buy a property with more than one bedroom. Others don't (e.g. AIB, ICS, Permanent TSB and others.) Horses for courses.
Just to be pedantic, there is no such thing as audited accounts for individuals - in receipt of income or otherwise. Audits apply only to certain classes of limited companies.
You don't have to do audited accounts under the rent-a-room scheme, you just declare it on your tax return (unfortunately it means you have to do a tax return though).