An annexe or a large top floor can be kept entirely for visiting family members.
From the telegraph.co.uk
Choose from studio apartments in the main building or doubles in the new annexe.
From the guardian.co.uk
The annexe across the way contains the compact but agreeably functional bedrooms.
From the telegraph.co.uk
Instead, it is in the pretty Victorian Tudor annexe, almost opposite David Jones.
From the smh.com.au
Four bedrooms, barn annexe and a south-facing garden overlooking the village.
From the telegraph.co.uk
The government's more immediate innovation is housed in an annexe next door.
From the economist.com
This was the first clear expression of British intent to annexe New Zealand.
From the en.wikipedia.org
It has five bedrooms, an annexe and exceptional grounds of about one acre.
From the telegraph.co.uk
Kitchen units are white, with matching worktops and from here is access to the annexe.
From the thisisbristol.co.uk
More examples
Annex: an addition that extends a main building
The Anne Frank House on Prinsengracht canal in Amsterdam, the Netherlands, is a museum dedicated to Jewish wartime diarist Anne Frank, who hid from Nazi persecution with her family and four other people in hidden rooms at the rear of the building. ...
Alternative spelling of annex; Alternative spelling of annex
Taking over an area under the control of a ruler or a State and adding it to a larger State
Ancillary dwelling, 'granny annexe' is a self-contained property located next to another property. Should have own entrance, and pay separate Council tax.
This refers to the additional building constructed adjacent to Maxwell's house to supplement working space.