If you require a beach chalet in Whitby, then you will need to get in touch with North Yorkshire Council.
For seasonal/annual chalet enquiries and bookings in Whitby, call 0300 131 2 131
For weekly chalet enquiries and bookings in Whitby, call 01723 513852
Follow the link to the North Yorkshire Council information page, below.
From that page you can also make daily and weekly bookings via their booking portal.