There are several ways in which a person’s home can fall within the definition of business premises, see CH25180.
Any business that includes in its accounts expenses for
‘use of home as office’ should be using the
proprietor’s home at least partly as business premises.
Similarly, if a person’s home is registered as the
principal place of business for VAT it is a reasonable assumption
that the home is being used at least partly as business premises.
On the other hand, we will not normally regard an
employee’s home as ‘business premises’ if they
occasionally use it to do work, in the evening or at weekends, that
is usually done in an office or other business premises.
See
CH25240 for guidance on when you should
visit a business run from the person’s home.