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@Velocio @swedeee cheers. In Bristol as an young person, given the state of house prices and amount of young people, and given how much interest the spareroom house I'm in currently gets when someone moves out and how hard it was to get a spareroom, I'd say it is fairly certain someone could let out the second double bedroom in a 2 bed flat in a good area for 600+ a month easy. Hoping to buy next year so I'll make that case to my bank and report back (ignorance is bliss and all that )
I think that could be done... claiming rent as part of income so that it is factored in.
But... there be dragons.
i.e. HMRC and claiming rent from a rented room.
Up to something like £7.5k (£625 per month) it's tax free and if it's reliable income you can certainly declare it as part of your income. But... above that, and you need to make sure that you're basically declaring it right, paying tax on it, etc. I'm not sure how that tax is calculated as I don't rent out a room... but income tax maybe via self assessment?
Edit: Found details: https://www.moneyadviceservice.org.uk/en/articles/rent-a-room-scheme-how-it-works-and-tax-rules and yup it's just tax free income up to a low threshold, and then either you need to opt-in and do it right or it's just income taxable.
As to how it affects a mortgage, it's just income. For remortgage, etc I doubt you can declare that you "intend to rent a room" without proving the income some way. Perhaps for a new property it is possible to convince some banks that you are going to rent a room... YMMV