Booking somewhere like a hotel yourself (places like Travelodge are very cheap when booked in advance)...
... or renting somewhere for work, either exclusively or subletting from someone (this has legal implications for them - once more than one person is working somewhere, even if not at the same time, it becomes a brothel: illegal to own, run or permit in premises you control, but not to work in or visit)...
... or, if you have enough money, buying somewhere for work...
... or working in a brothel, including for an agency that supplies flats (for an extra cut).
People do outcalls during the day of course.