From HMRC Website

The Rent a Room Scheme

The Rent a Room Scheme lets you earn up to a threshold of £7,500 per year tax-free from letting out furnished accommodation in your home. This is halved if you share the income with your partner or someone else.

You can let out as much of your home as you want.

Information from here:
https://www.gov.uk/rent-room-in-your-home/the-rent-a-room-scheme

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