Renting a spare room has a number of benefits, but is not risk free. Would be landlords need to consider:-

1. Will their house and buildings insurance cover damage caused by "lodgers".

2. Is permission required from mortgage lenders?

3. Are there any restrictions on operating a business from your home?

4. If you have a leasehold property you may need the freeholders consent to sublet and this may entail paying a fee.

As a risk averse lawyer, I would always advise clients to check their position before accepting a tenant into their home...and even then consider taking out landlords insurance...just in case you need to sue tenants who abscond without paying rent or damaging the property.